/* * wiringPi: * Arduino look-a-like Wiring library for the Raspberry Pi * Copyright (c) 2012-2017 Gordon Henderson * Additional code for pwmSetClock by Chris Hall * * Thanks to code samples from Gert Jan van Loo and the * BCM2835 ARM Peripherals manual, however it's missing * the clock section /grr/mutter/ *********************************************************************** * This file is part of wiringPi: * https://github.com/nuncio-bitis/WiringPi * * wiringPi is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * wiringPi is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with wiringPi. * If not, see . *********************************************************************** */ // Revisions: // 08 March 2022: // Updates to revisioning from https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#new-style-revision-codes-in-use // // 19 Jul 2012: // Moved to the LGPL // Added an abstraction layer to the main routines to save a tiny // bit of run-time and make the clode a little cleaner (if a little // larger) // Added waitForInterrupt code // Added piHiPri code // // 9 Jul 2012: // Added in support to use the /sys/class/gpio interface. // 2 Jul 2012: // Fixed a few more bugs to do with range-checking when in GPIO mode. // 11 Jun 2012: // Fixed some typos. // Added c++ support for the .h file // Added a new function to allow for using my "pin" numbers, or native // GPIO pin numbers. // Removed my busy-loop delay and replaced it with a call to delayMicroseconds // // 02 May 2012: // Added in the 2 UART pins // Change maxPins to numPins to more accurately reflect purpose #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "softPwm.h" #include "softTone.h" #include "wiringPi.h" #include "../version.h" // Environment Variables #define ENV_DEBUG "WIRINGPI_DEBUG" #define ENV_CODES "WIRINGPI_CODES" // Extend wiringPi with other pin-based devices and keep track of // them in this structure struct wiringPiNodeStruct *wiringPiNodes = NULL; // BCM Magic #define BCM_PASSWORD 0x5A000000 // Full revision string static uint32_t fullRevision = 0; // The BCM2835 has 54 GPIO pins. // BCM2835 data sheet, Page 90 onwards. // There are 6 control registers, each control the functions of a block // of 10 pins. // Each control register has 10 sets of 3 bits per GPIO pin - the ALT values // // 000 = GPIO Pin X is an input // 001 = GPIO Pin X is an output // 100 = GPIO Pin X takes alternate function 0 // 101 = GPIO Pin X takes alternate function 1 // 110 = GPIO Pin X takes alternate function 2 // 111 = GPIO Pin X takes alternate function 3 // 011 = GPIO Pin X takes alternate function 4 // 010 = GPIO Pin X takes alternate function 5 // // So the 3 bits for port X are: // X / 10 + ((X % 10) * 3) // Port function select bits #define FSEL_INPT 0b000 #define FSEL_OUTP 0b001 #define FSEL_ALT0 0b100 #define FSEL_ALT1 0b101 #define FSEL_ALT2 0b110 #define FSEL_ALT3 0b111 #define FSEL_ALT4 0b011 #define FSEL_ALT5 0b010 // Access from ARM Running Linux // Taken from Gert/Doms code. Some of this is not in the manual // that I can find )-: // // Updates in September 2015 - all now static variables (and apologies for the caps) // due to the Pi v2, v3, etc. and the new /dev/gpiomem interface static volatile unsigned int GPIO_PADS; static volatile unsigned int GPIO_CLOCK_BASE; static volatile unsigned int GPIO_BASE; static volatile unsigned int GPIO_TIMER; static volatile unsigned int GPIO_PWM; #define PAGE_SIZE (4*1024) #define BLOCK_SIZE (4*1024) static unsigned int usingGpioMem = FALSE; static int wiringPiSetuped = FALSE; // PWM // Word offsets into the PWM control region #define PWM_CONTROL 0 #define PWM_STATUS 1 #define PWM0_RANGE 4 #define PWM0_DATA 5 #define PWM1_RANGE 8 #define PWM1_DATA 9 // Clock regsiter offsets #define PWMCLK_CNTL 40 #define PWMCLK_DIV 41 #define PWM0_MS_MODE 0x0080 // Run in MS mode #define PWM0_USEFIFO 0x0020 // Data from FIFO #define PWM0_REVPOLAR 0x0010 // Reverse polarity #define PWM0_OFFSTATE 0x0008 // Ouput Off state #define PWM0_REPEATFF 0x0004 // Repeat last value if FIFO empty #define PWM0_SERIAL 0x0002 // Run in serial mode #define PWM0_ENABLE 0x0001 // Channel Enable #define PWM1_MS_MODE 0x8000 // Run in MS mode #define PWM1_USEFIFO 0x2000 // Data from FIFO #define PWM1_REVPOLAR 0x1000 // Reverse polarity #define PWM1_OFFSTATE 0x0800 // Ouput Off state #define PWM1_REPEATFF 0x0400 // Repeat last value if FIFO empty #define PWM1_SERIAL 0x0200 // Run in serial mode #define PWM1_ENABLE 0x0100 // Channel Enable // Timer // Word offsets #define TIMER_LOAD (0x400 >> 2) #define TIMER_VALUE (0x404 >> 2) #define TIMER_CONTROL (0x408 >> 2) #define TIMER_IRQ_CLR (0x40C >> 2) #define TIMER_IRQ_RAW (0x410 >> 2) #define TIMER_IRQ_MASK (0x414 >> 2) #define TIMER_RELOAD (0x418 >> 2) #define TIMER_PRE_DIV (0x41C >> 2) #define TIMER_COUNTER (0x420 >> 2) // Locals to hold pointers to the hardware static volatile unsigned int *gpio; static volatile unsigned int *pwm; static volatile unsigned int *clk; static volatile unsigned int *pads; static volatile unsigned int *timer; static volatile unsigned int *timerIrqRaw; // Export variables for the hardware pointers volatile unsigned int *_wiringPiGpio; volatile unsigned int *_wiringPiPwm; volatile unsigned int *_wiringPiClk; volatile unsigned int *_wiringPiPads; volatile unsigned int *_wiringPiTimer; volatile unsigned int *_wiringPiTimerIrqRaw; // Data for use with the boardId functions. // The order of entries here to correspond with the PI_MODEL_X // and PI_VERSION_X defines in wiringPi.h // Only intended for the gpio command - use at your own risk! // piGpioBase: // The base address of the GPIO memory mapped hardware IO #define GPIO_PERI_BASE_OLD 0x20000000 #define GPIO_PERI_BASE_2835 0x3F000000 #define GPIO_PERI_BASE_2711 0xFE000000 static volatile unsigned int piGpioBase = 0; const char *piModelNames[21] = { "Model A", // 0 "Model B", // 1 "Model A+", // 2 "Model B+", // 3 "Pi 2B", // 4 "Alpha", // 5 "CM1", // 6 "Unknown07", // 7 "Pi 3B", // 8 "Pi Zero", // 9 "CM3", // 10 "Unknown11", // 11 "Pi Zero-W", // 12 "Pi 3B+", // 13 "Pi 3A+", // 14 "Unknown15", // 15 "CM3+", // 16 "Pi 4B", // 17 "Pi Zero2-W", // 18 "Pi 400", // 19 "CM4", // 20 }; const char *piRevisionNames[5] = { "1.0", "1.1", "1.2", "1.3", "1.4" }; const char *piMakerNames[16] = { "Sony", // 0 "Egoman", // 1 "Embest", // 2 "Sony Japan", // 3 "Embest", // 4 "Stadium", // 5 "Unknown06", // 6 "Unknown07", // 7 "Unknown08", // 8 "Unknown09", // 9 "Unknown10", // 10 "Unknown11", // 11 "Unknown12", // 12 "Unknown13", // 13 "Unknown14", // 14 "Unknown15", // 15 }; const char *piProcessorNames[5] = { "BCM2835", "BCM2836", "BCM2837", "BCM2711", "Unknown" }; // Memory sizes in MB const char *piMemorySize[8] = { "256MB", // 0 "512MB", // 1 "1GB", // 2 "2GB", // 3 "4GB", // 4 "8GB", // 5 "16GB", // 6 "32GB", // 7 }; // Time for easy calculations static uint64_t epochMilli, epochMicro; // Misc static int wiringPiMode = WPI_MODE_UNINITIALISED; static pthread_mutex_t pinMutex; // Debugging & Return codes // Intentionally global; also used in gpio.c int wiringPiDebug = FALSE; int wiringPiReturnCodes = TRUE; // Use /dev/gpiomem ? int wiringPiTryGpioMem = FALSE; // sysFds: // Map a file descriptor from the /sys/class/gpio/gpioX/value static int sysFds[MAX_ONBOARD_PINS] = { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, }; // ISR Data static void (*isrFunctions[MAX_ONBOARD_PINS])(int pin); // Doing it the Arduino way with lookup tables... // Yes, it's probably more innefficient than all the bit-twidling, but it // does tend to make it all a bit clearer. At least to me! // pinToGpio: // Take a Wiring pin (0 through X) and re-map it to the BCM_GPIO pin // Cope for 3 different board revisions here. static int *pinToGpio; // Index: WiringPi pin # // Value @ index: BCM GPIO # // Revision 1, 1.1: static int pinToGpioR1[MAX_ONBOARD_PINS] = { // From the Original Wiki 17, 18, 21, 22, 23, 24, 25, 4, // GPIO 0 through 7 : wpi 0 - 7 0, 1, // I2C - SDA1, SCL1 : wpi 8 - 9 8, 7, // SPI - CE1, CE0 : wpi 10 - 11 10, 9, 11, // SPI - MOSI, MISO, SCLK : wpi 12 - 14 14, 15, // UART - Tx, Rx : wpi 15 - 16 // Padding: -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // ... 31 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // ... 47 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // ... 63 }; // Index: WiringPi pin # // Value @ index: BCM GPIO # // Revisions 2...: static int pinToGpioR2[MAX_ONBOARD_PINS] = { // From the Original Wiki 17, 18, 27, 22, 23, 24, 25, 4, // GPIO 0 through 7 : wpi 0 - 7 2, 3, // I2C - SDA0, SCL0 : wpi 8 - 9 8, 7, // SPI - CE1, CE0 : wpi 10 - 11 10, 9, 11, // SPI - MOSI, MISO, SCLK : wpi 12 - 14 14, 15, // UART - Tx, Rx : wpi 15 - 16 28, 29, 30, 31, // Rev 2: New GPIOs 8 though 11 : wpi 17 - 20 5, 6, 13, 19, 26, // B+ : wpi 21, 22, 23, 24, 25 12, 16, 20, 21, // B+ : wpi 26, 27, 28, 29 0, 1, // B+ : wpi 30, 31 // Padding: -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // ... 47 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // ... 63 }; // physToGpio: // Take a physical pin (1 through 26) and re-map it to the BCM_GPIO pin // Cope for 2 different board revisions here. // Also add in the P5 connector, so the P5 pins are 3,4,5,6, so 53,54,55,56 static int *physToGpio; // Index: Physical pin # // Value @ index: BCM GPIO # static int physToGpioR1[MAX_ONBOARD_PINS] = { -1, // 0 -1, -1, // 1, 2 0, -1, 1, -1, 4, 14, -1, 15, 17, 18, 21, -1, 22, 23, -1, 24, 10, -1, 9, 25, 11, 8, -1, 7, // 25, 26 -1, -1, -1, -1, -1, // ... 31 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // ... 47 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // ... 63 }; // Index: Physical pin # // Value @ index: BCM GPIO # static int physToGpioR2[MAX_ONBOARD_PINS] = { -1, // 0 -1, -1, // 1, 2 2, -1, 3, -1, 4, 14, -1, 15, 17, 18, 27, -1, 22, 23, -1, 24, 10, -1, 9, 25, 11, 8, -1, 7, // 25, 26 // B+ 0, 1, // 27, 28 5, -1, 6, 12, 13, -1, 19, 16, 26, 20, -1, 21, // 39, 40 // the P5 connector on the Rev 2 boards: -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 28, 29, 30, 31, -1, -1, -1, -1, -1, -1, -1, -1, }; // gpioToGPFSEL: // Map a BCM_GPIO pin to its Function Selection // control port. (GPFSEL 0-5) // Groups of 10 - 3 bits per Function - 30 bits per port static uint8_t gpioToGPFSEL[] = { 0,0,0,0,0,0,0,0,0,0, 1,1,1,1,1,1,1,1,1,1, 2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,3,3, 4,4,4,4,4,4,4,4,4,4, 5,5,5,5,5,5,5,5,5,5, }; // gpioToShift // Define the shift up for the 3 bits per pin in each GPFSEL port static uint8_t gpioToShift[] = { 0,3,6,9,12,15,18,21,24,27, 0,3,6,9,12,15,18,21,24,27, 0,3,6,9,12,15,18,21,24,27, 0,3,6,9,12,15,18,21,24,27, 0,3,6,9,12,15,18,21,24,27, 0,3,6,9,12,15,18,21,24,27, }; // gpioToGPSET: // (Word) offset to the GPIO Set registers for each GPIO pin static uint8_t gpioToGPSET[] = { 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, }; // gpioToGPCLR: // (Word) offset to the GPIO Clear registers for each GPIO pin static uint8_t gpioToGPCLR[] = { 10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10, 11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11, }; // gpioToGPLEV: // (Word) offset to the GPIO Input level registers for each GPIO pin // This will handle banks 0 and 1 of GPIOs static uint8_t gpioToGPLEV[] = { 13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13, // bank 0 14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14, // bank 1 }; // GPPUD: // GPIO Pin pull up/down register #define GPPUD 37 /* 2711 has a different mechanism for pin pull-up/down/enable */ #define GPPUPPDN0 57 /* Pin pull-up/down for pins 15:0 */ #define GPPUPPDN1 58 /* Pin pull-up/down for pins 31:16 */ #define GPPUPPDN2 59 /* Pin pull-up/down for pins 47:32 */ #define GPPUPPDN3 60 /* Pin pull-up/down for pins 57:48 */ static volatile unsigned int piGpioPupOffset = 0; // gpioToPUDCLK // (Word) offset to the Pull Up Down Clock regsiter static uint8_t gpioToPUDCLK[] = { 38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38,38, 39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39, }; // gpioToPwmALT // the ALT value to put a GPIO pin into PWM mode static uint8_t gpioToPwmALT[] = { 0, 0, 0, 0, 0, 0, 0, 0, // 0 -> 7 0, 0, 0, 0, FSEL_ALT0, FSEL_ALT0, 0, 0, // 8 -> 15 0, 0, FSEL_ALT5, FSEL_ALT5, 0, 0, 0, 0, // 16 -> 23 0, 0, 0, 0, 0, 0, 0, 0, // 24 -> 31 0, 0, 0, 0, 0, 0, 0, 0, // 32 -> 39 FSEL_ALT0, FSEL_ALT0, 0, 0, 0, FSEL_ALT0, 0, 0, // 40 -> 47 0, 0, 0, 0, 0, 0, 0, 0, // 48 -> 55 0, 0, 0, 0, 0, 0, 0, 0, // 56 -> 63 }; // gpioToPwmPort // The port value to put a GPIO pin into PWM mode static uint8_t gpioToPwmPort[] = { 0, 0, 0, 0, 0, 0, 0, 0, // 0 -> 7 0, 0, 0, 0, PWM0_DATA, PWM1_DATA, 0, 0, // 8 -> 15 0, 0, PWM0_DATA, PWM1_DATA, 0, 0, 0, 0, // 16 -> 23 0, 0, 0, 0, 0, 0, 0, 0, // 24 -> 31 0, 0, 0, 0, 0, 0, 0, 0, // 32 -> 39 PWM0_DATA, PWM1_DATA, 0, 0, 0, PWM1_DATA, 0, 0, // 40 -> 47 0, 0, 0, 0, 0, 0, 0, 0, // 48 -> 55 0, 0, 0, 0, 0, 0, 0, 0, // 56 -> 63 }; // gpioToGpClkALT: // ALT value to put a GPIO pin into GP Clock mode. // On the Pi we can really only use BCM_GPIO_4 and BCM_GPIO_21 // for clocks 0 and 1 respectively, however I'll include the full // list for completeness - maybe one day... #define GPIO_CLOCK_SOURCE 1 // gpioToGpClkALT0: static uint8_t gpioToGpClkALT0[] = { 0, 0, 0, 0, FSEL_ALT0, FSEL_ALT0, FSEL_ALT0, 0, // 0 -> 7 0, 0, 0, 0, 0, 0, 0, 0, // 8 -> 15 0, 0, 0, 0, FSEL_ALT5, FSEL_ALT5, 0, 0, // 16 -> 23 0, 0, 0, 0, 0, 0, 0, 0, // 24 -> 31 FSEL_ALT0, 0, FSEL_ALT0, 0, 0, 0, 0, 0, // 32 -> 39 0, 0, FSEL_ALT0, FSEL_ALT0, FSEL_ALT0, 0, 0, 0, // 40 -> 47 0, 0, 0, 0, 0, 0, 0, 0, // 48 -> 55 0, 0, 0, 0, 0, 0, 0, 0, // 56 -> 63 }; // gpioToClk: // (word) Offsets to the clock Control and Divisor register static int gpioToClkCon[] = { -1, -1, -1, -1, 28, 30, 32, -1, // 0 -> 7 -1, -1, -1, -1, -1, -1, -1, -1, // 8 -> 15 -1, -1, -1, -1, 28, 30, -1, -1, // 16 -> 23 -1, -1, -1, -1, -1, -1, -1, -1, // 24 -> 31 28, -1, 28, -1, -1, -1, -1, -1, // 32 -> 39 -1, -1, 28, 30, 28, -1, -1, -1, // 40 -> 47 -1, -1, -1, -1, -1, -1, -1, -1, // 48 -> 55 -1, -1, -1, -1, -1, -1, -1, -1, // 56 -> 63 }; static int gpioToClkDiv[] = { -1, -1, -1, -1, 29, 31, 33, -1, // 0 -> 7 -1, -1, -1, -1, -1, -1, -1, -1, // 8 -> 15 -1, -1, -1, -1, 29, 31, -1, -1, // 16 -> 23 -1, -1, -1, -1, -1, -1, -1, -1, // 24 -> 31 29, -1, 29, -1, -1, -1, -1, -1, // 32 -> 39 -1, -1, 29, 31, 29, -1, -1, -1, // 40 -> 47 -1, -1, -1, -1, -1, -1, -1, -1, // 48 -> 55 -1, -1, -1, -1, -1, -1, -1, -1, // 56 -> 63 }; /* * Functions ********************************************************************************* */ /* * wiringPiFailure: * Fail. Or not. ********************************************************************************* */ int wiringPiFailure (int fatal, const char *message, ...) { va_list argp; char buffer[1024]; va_start (argp, message); vsnprintf (buffer, 1023, message, argp); va_end (argp); fprintf (stderr, "%s", buffer); if (!fatal && wiringPiReturnCodes) return -1; exit (EXIT_FAILURE); return 0; } /* * setupCheck * Another sanity check because some users forget to call the setup * function. Mosty because they need feeding C drip by drip )-: ********************************************************************************* */ static void setupCheck (const char *fName) { if (!wiringPiSetuped) { fprintf (stderr, "[FATAL] %s: You have not called one of the wiringPiSetup functions. Aborting.\n", fName); exit (EXIT_FAILURE); } } /* * gpioMemCheck: * See if we're using the /dev/gpiomem interface, if-so then some operations * can't be done and will crash the Pi. ********************************************************************************* */ static void usingGpioMemCheck (const char *what) { if (usingGpioMem) { fprintf (stderr, "[FATAL] %s: Unable to do this when using /dev/gpiomem. You need to use sudo\n", what); exit (EXIT_FAILURE); } } /* * piGpioLayout: * Return a number representing the hardware revision of the board. * This is not strictly the board revision but is used to check the * layout of the GPIO connector - and there are 2 types that we are * really interested in here. The very earliest Pi's and the * ones that came after that which switched some pins .... * * Revision 1 really means the early Model A and B's. * Revision 2 is everything else - it covers the B, B+ and CM. * ... and the Pi 2 - which is a B+ ++ ... * ... and the Pi 0 - which is an A+ ... * * The main difference between the revision 1 and 2 system that I use here * is the mapping of the GPIO pins. From revision 2, the Pi Foundation changed * 3 GPIO pins on the (original) 26-way header - BCM_GPIO 22 was dropped and * replaced with 27, and 0 + 1 - I2C bus 0 was changed to 2 + 3; I2C bus 1. * * Additionally, here we set the piModel2 flag too. This is again, nothing to * do with the actual model, but the major version numbers - the GPIO base * hardware address changed at model 2 and above (not the Zero though) * ********************************************************************************* */ static void piGpioLayoutOops (const char *why) { fprintf (stderr, "[FATAL] Unable to determine board revision from /proc/cpuinfo\n"); fprintf (stderr, " -> %s\n", why); exit (EXIT_FAILURE); } int piGpioLayout (void) { FILE *cpuFd; char line[120]; char *c; static int gpioLayout = -1; // Set the first time this is called // If already set, just return the previously-found value. if (gpioLayout != -1) return gpioLayout; if ((cpuFd = fopen ("/proc/cpuinfo", "r")) == NULL) piGpioLayoutOops ("Unable to open /proc/cpuinfo"); // -------------------------------------------- // Get the model description while (fgets (line, 120, cpuFd) != NULL) if (strncmp (line, "Model", 5) == 0) break; if (strncmp (line, "Model", 5) != 0) piGpioLayoutOops ("No \"Model\" line"); else { for (c = line; *c; ++c) { if (*c == ':') break; } ++c; // Skip colon // Skip space while ((*c == ' ') || (*c == '\t')) { ++c; } if (wiringPiDebug) { printf ("piGpioLayout: Model: %s", c); } } // -------------------------------------------- // Get hardware architecture. rewind (cpuFd); while (fgets (line, 120, cpuFd) != NULL) if (strncmp (line, "Hardware", 8) == 0) break; if (strncmp (line, "Hardware", 8) != 0) piGpioLayoutOops ("No \"Hardware\" line"); else { for (c = line; *c; ++c) { if (*c == ':') break; } ++c; // Skip colon // Skip space while ((*c == ' ') || (*c == '\t')) { ++c; } if (wiringPiDebug) { printf ("piGpioLayout: Hardware: %s", c); } } // -------------------------------------------- // Get the Revision line rewind (cpuFd); while (fgets (line, 120, cpuFd) != NULL) if (strncmp (line, "Revision", 8) == 0) break; fclose (cpuFd); if (strncmp (line, "Revision", 8) != 0) piGpioLayoutOops ("No \"Revision\" line"); // Chomp CR and/or LF for (c = line; *c; ++c) { if ((*c == '\n') || (*c == '\r')) { *c = 0; } } // Scan to the first character of the revision number for (c = line; *c; ++c) { if (*c == ':') break; } ++c; // Skip colon // Skip space while ((*c == ' ') || (*c == '\t')) { ++c; } if (wiringPiDebug) { printf ("piGpioLayout: Revision string: %s\n", c); } if (!isxdigit (*c)) piGpioLayoutOops ("Bogus \"Revision\" line (no hex digit at start of revision)"); // Make sure its long enough if (strlen (c) < 4) piGpioLayoutOops ("Bogus revision line (too small)"); // Use last character for revision number char *rev = c + strlen (c) - 1; int revnum = atoi(rev); if (wiringPiDebug) { printf ("piGpioLayout: Revision number: 1.%d\n", revnum); } // Isolate last 4 characters: (in-case of overvolting or new encoding scheme) c = c + strlen (c) - 4; if ( (strcmp (c, "0002") == 0) || (strcmp (c, "0003") == 0)) gpioLayout = 1 ; else gpioLayout = 2 ; // Covers everything else from the B revision 2 to the B+, the Pi v2, v3, zero and CM's. if (wiringPiDebug) printf ("piGpioLayout: Returning revision: %d\n", gpioLayout); // -------------------------------------------- return gpioLayout; } /* * piBoardId: * Return the real details of the board we have. * See: * https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#new-style-revision-codes-in-use * * This is undocumented and really only intended for the GPIO command. * Use at your own risk! * * Seems there are some boards with 0000 in them (mistake in manufacture) * So the distinction between boards that I can see is: * * 0000 - Error * 0001 - Not used * * Old-style revision codes * Original Pi boards: * 0002 - Model B, Rev 1.0, 256MB, Egoman * 0003 - Model B, Rev 1.0, 256MB, Egoman, Fuses/D14 removed. * Newer Pi's with remapped GPIO: * 0004 - Model B, Rev 2.0, 256MB, Sony * 0005 - Model B, Rev 2.0, 256MB, Qisda * 0006 - Model B, Rev 2.0, 256MB, Egoman * 0007 - Model A, Rev 2.0, 256MB, Egoman * 0008 - Model A, Rev 2.0, 256MB, Sony * 0009 - Model A, Rev 2.0, 256MB, Qisda * 000d - Model B, Rev 2.0, 512MB, Egoman * 000e - Model B, Rev 2.0, 512MB, Sony * 000f - Model B, Rev 2.0, 512MB, Egoman * 0010 - Model B+, Rev 1.2, 512MB, Sony * 0011 - Pi CM, Rev 1.0, 512MB, Sony * 0012 - Model A+ Rev 1.1, 256MB, Sony * 0013 - Model B+ Rev 1.2, 512MB, Embest * 0014 - Pi CM1, Rev 1.0, 512MB, Embest * 0015 - Model A+ Rev 1.1, 256MB/512MB, Embest * * A small thorn is the olde style overvolting - that will add in * 1000000 * * The Pi compute module one has a revision of 0011 or 0014 - since we only * check the last digit, then it's 1, therefore it'll default to not 2 or * 3 for a Rev 1, so will appear as a Rev 2. This is fine for the most part, but * we'll properly detect the Compute Module later and adjust accordingly. * * And then things changed with the introduction of the v2... * * For Pi v2 and subsequent models - e.g. the Zero: * * [USER:8][NEW:1][MEMSIZE:3][MANUFACTURER:4][PROCESSOR:4][TYPE:8][REV:4] * NEW 23: will be 1 for the new scheme, 0 for the old scheme * MEMSIZE 20: 0=256M 1=512M 2=1G * MANUFACTURER 16: 0=SONY 1=EGOMAN 2=EMBEST * PROCESSOR 12: 0=2835 1=2836 * TYPE 04: 0=MODELA 1=MODELB 2=MODELA+ 3=MODELB+ 4=Pi2 MODEL B 5=ALPHA 6=CM * REV 00: 0=REV0 1=REV1 2=REV2 ********************************************************************************* */ uint32_t piBoardId (int *model, int *proc, int *rev, int *mem, int *maker, int *warranty) { FILE *cpuFd; char line[120]; char *c; unsigned int revision; int bRev, bType, bProc, bMfg, bMem, bWarranty; (void)piGpioLayout(); // Call this first to make sure all's OK. Don't care about the result. if ((cpuFd = fopen ("/proc/cpuinfo", "r")) == NULL) piGpioLayoutOops ("Unable to open /proc/cpuinfo"); while (fgets (line, 120, cpuFd) != NULL) if (strncmp (line, "Revision", 8) == 0) break; fclose (cpuFd); if (strncmp (line, "Revision", 8) != 0) piGpioLayoutOops ("No \"Revision\" line"); // Chomp trailing CR/NL for (c = &line[strlen (line) - 1]; (*c == '\n') || (*c == '\r'); --c) { *c = 0; } if (wiringPiDebug) printf ("piBoardId: Revision string: %s\n", line); // Need to work out if it's using the new or old encoding scheme: // Scan to the first character of the revision number for (c = line; *c; ++c) if (*c == ':') break; if (*c != ':') piGpioLayoutOops ("Bogus \"Revision\" line (no colon)"); // Chomp spaces ++c; while (isspace (*c)) ++c; if (!isxdigit (*c)) piGpioLayoutOops ("Bogus \"Revision\" line (no hex digit at start of revision)"); revision = (unsigned int)strtol (c, NULL, 16); // Hex number with no leading 0x // Save full revision number fullRevision = revision; // Check for new way: Bit 23 of the revision number if ((revision & (1 << 23)) != 0) // New way { if (wiringPiDebug) printf ("piBoardId: New Way: revision is: 0x%08X\n", revision); bRev = (revision & (0x0F << 0)) >> 0; bType = (revision & (0xFF << 4)) >> 4; bProc = (revision & (0x0F << 12)) >> 12; bMfg = (revision & (0x0F << 16)) >> 16; bMem = (revision & (0x07 << 20)) >> 20; bWarranty = (revision & (0x03 << 24)) != 0; *model = bType; *proc = bProc; *rev = bRev; *mem = bMem; *maker = bMfg ; *warranty = bWarranty; if (wiringPiDebug) printf ("piBoardId: rev: %d, type: %d, proc: %d, mfg: %d, mem: %d, warranty: %d\n", bRev, bType, bProc, bMfg, bMem, bWarranty); } else // Old way { if (wiringPiDebug) printf ("piBoardId: Old Way: revision is: %s\n", c); if (!isdigit (*c)) piGpioLayoutOops ("Bogus \"Revision\" line (no digit at start of revision)"); // Make sure its long enough if (strlen (c) < 4) piGpioLayoutOops ("Bogus \"Revision\" line (not long enough)"); // If longer than 4, we'll assume it's been overvolted *warranty = strlen (c) > 4; // Extract last 4 characters: c = c + strlen (c) - 4; // Using the old way - the processor was always reported as BCM2835 *proc = 0; // Fill out the replys as appropriate if (strcmp (c, "0002") == 0) { *model = PI_MODEL_B ; *rev = PI_VERSION_1 ; *mem = 0; *maker = PI_MAKER_EGOMAN ; } else if (strcmp (c, "0003") == 0) { *model = PI_MODEL_B ; *rev = PI_VERSION_1_1; *mem = 0; *maker = PI_MAKER_EGOMAN ; } else if (strcmp (c, "0004") == 0) { *model = PI_MODEL_B ; *rev = PI_VERSION_1_2; *mem = 0; *maker = PI_MAKER_SONY ; } else if (strcmp (c, "0005") == 0) { *model = PI_MODEL_B ; *rev = PI_VERSION_1_2; *mem = 0; *maker = PI_MAKER_EGOMAN ; } else if (strcmp (c, "0006") == 0) { *model = PI_MODEL_B ; *rev = PI_VERSION_1_2; *mem = 0; *maker = PI_MAKER_EGOMAN ; } else if (strcmp (c, "0007") == 0) { *model = PI_MODEL_A ; *rev = PI_VERSION_1_2; *mem = 0; *maker = PI_MAKER_EGOMAN ; } else if (strcmp (c, "0008") == 0) { *model = PI_MODEL_A ; *rev = PI_VERSION_1_2; *mem = 0; *maker = PI_MAKER_SONY; ; } else if (strcmp (c, "0009") == 0) { *model = PI_MODEL_A ; *rev = PI_VERSION_1_2; *mem = 0; *maker = PI_MAKER_EGOMAN ; } else if (strcmp (c, "000d") == 0) { *model = PI_MODEL_B ; *rev = PI_VERSION_1_2; *mem = 1; *maker = PI_MAKER_EGOMAN ; } else if (strcmp (c, "000e") == 0) { *model = PI_MODEL_B ; *rev = PI_VERSION_1_2; *mem = 1; *maker = PI_MAKER_SONY ; } else if (strcmp (c, "000f") == 0) { *model = PI_MODEL_B ; *rev = PI_VERSION_1_2; *mem = 1; *maker = PI_MAKER_EGOMAN ; } else if (strcmp (c, "0010") == 0) { *model = PI_MODEL_BP; *rev = PI_VERSION_1_2; *mem = 1; *maker = PI_MAKER_SONY ; } else if (strcmp (c, "0013") == 0) { *model = PI_MODEL_BP; *rev = PI_VERSION_1_2; *mem = 1; *maker = PI_MAKER_EMBEST ; } else if (strcmp (c, "0016") == 0) { *model = PI_MODEL_BP; *rev = PI_VERSION_1_2; *mem = 1; *maker = PI_MAKER_SONY ; } else if (strcmp (c, "0019") == 0) { *model = PI_MODEL_BP; *rev = PI_VERSION_1_2; *mem = 1; *maker = PI_MAKER_EGOMAN ; } else if (strcmp (c, "0011") == 0) { *model = PI_MODEL_CM1; *rev = PI_VERSION_1_1; *mem = 1; *maker = PI_MAKER_SONY ; } else if (strcmp (c, "0014") == 0) { *model = PI_MODEL_CM1; *rev = PI_VERSION_1_1; *mem = 1; *maker = PI_MAKER_EMBEST ; } else if (strcmp (c, "0017") == 0) { *model = PI_MODEL_CM1; *rev = PI_VERSION_1_1; *mem = 1; *maker = PI_MAKER_SONY ; } else if (strcmp (c, "001a") == 0) { *model = PI_MODEL_CM1; *rev = PI_VERSION_1_1; *mem = 1; *maker = PI_MAKER_EGOMAN ; } else if (strcmp (c, "0012") == 0) { *model = PI_MODEL_AP; *rev = PI_VERSION_1_1; *mem = 0; *maker = PI_MAKER_SONY ; } else if (strcmp (c, "0015") == 0) { *model = PI_MODEL_AP; *rev = PI_VERSION_1_1; *mem = 1; *maker = PI_MAKER_EMBEST ; } else if (strcmp (c, "0018") == 0) { *model = PI_MODEL_AP; *rev = PI_VERSION_1_1; *mem = 0; *maker = PI_MAKER_SONY ; } else if (strcmp (c, "001b") == 0) { *model = PI_MODEL_AP; *rev = PI_VERSION_1_1; *mem = 0; *maker = PI_MAKER_EGOMAN ; } else { *model = 0 ; *rev = 0 ; *mem = 0; *maker = 0; } } return fullRevision; } /* * wpiPinToGpio: * Translate a wiringPi Pin number to native GPIO pin number. * Provided for external support. ********************************************************************************* */ int wpiPinToGpio (int wpiPin) { return pinToGpio[wpiPin & 63]; } /* * physPinToGpio: * Translate a physical Pin number to native GPIO pin number. * Provided for external support. ********************************************************************************* */ int physPinToGpio (int physPin) { return physToGpio[physPin & 63]; } /* * setPadDrive: * Set the PAD driver value ********************************************************************************* */ void setPadDrive (int group, int value) { uint32_t wrVal; if ((wiringPiMode == WPI_MODE_PINS) || (wiringPiMode == WPI_MODE_PHYS) || (wiringPiMode == WPI_MODE_GPIO)) { if ((group < 0) || (group > 2)) return; wrVal = BCM_PASSWORD | 0x18 | (value & 7); *(pads + group + 11) = wrVal; if (wiringPiDebug) { printf ("setPadDrive: Group: %d, value: %d (%08X)\n", group, value, wrVal); printf ("Read : %08X\n", *(pads + group + 11)); } } } /* * getAlt: * Returns the ALT bits for a given port. Only really of-use * for the gpio readall command (I think) ********************************************************************************* */ int getAlt (int pin) { int fSel, shift, alt; pin &= 63; if (wiringPiMode == WPI_MODE_PINS) pin = pinToGpio[pin]; else if (wiringPiMode == WPI_MODE_PHYS) pin = physToGpio[pin]; else if (wiringPiMode != WPI_MODE_GPIO) return 0; fSel = gpioToGPFSEL[pin]; shift = gpioToShift [pin]; alt = (*(gpio + fSel) >> shift) & 7; return alt; } /* * pwmSetMode: * Select the native "balanced" mode, or standard mark:space mode ********************************************************************************* */ void pwmSetMode (int mode) { if ((wiringPiMode == WPI_MODE_PINS) || (wiringPiMode == WPI_MODE_PHYS) || (wiringPiMode == WPI_MODE_GPIO)) { if (mode == PWM_MODE_MS) *(pwm + PWM_CONTROL) = PWM0_ENABLE | PWM1_ENABLE | PWM0_MS_MODE | PWM1_MS_MODE; else *(pwm + PWM_CONTROL) = PWM0_ENABLE | PWM1_ENABLE; } } /* * pwmSetRange: * Set the PWM range register. We set both range registers to the same * value. If you want different in your own code, then write your own. ********************************************************************************* */ void pwmSetRange (unsigned int range) { if ((wiringPiMode == WPI_MODE_PINS) || (wiringPiMode == WPI_MODE_PHYS) || (wiringPiMode == WPI_MODE_GPIO)) { *(pwm + PWM0_RANGE) = range; delayMicroseconds (10); *(pwm + PWM1_RANGE) = range; delayMicroseconds (10); } } /* * pwmSetClock: * Set/Change the PWM clock. ********************************************************************************* */ void pwmSetClock (int divisor) { uint32_t pwm_control; if (piGpioBase == GPIO_PERI_BASE_2711) { divisor = 540*divisor/192; } // Keep divisor in range. if (divisor > 4095) { divisor = 4095; } if ((wiringPiMode == WPI_MODE_PINS) || (wiringPiMode == WPI_MODE_PHYS) || (wiringPiMode == WPI_MODE_GPIO)) { if (wiringPiDebug) printf ("Setting to: %d. Current: 0x%08X\n", divisor, *(clk + PWMCLK_DIV)); pwm_control = *(pwm + PWM_CONTROL); // preserve PWM_CONTROL // We need to stop PWM prior to stopping PWM clock in MS mode otherwise BUSY stays high. *(pwm + PWM_CONTROL) = 0; // Stop PWM // Stop PWM clock before changing divisor. The delay after this does need to // this big (95uS occasionally fails, 100uS OK), it's almost as though the BUSY // flag is not working properly in balanced mode. Without the delay when DIV is // adjusted the clock sometimes switches to very slow, once slow further DIV // adjustments do nothing and it's difficult to get out of this mode. *(clk + PWMCLK_CNTL) = BCM_PASSWORD | 0x01; // Stop PWM Clock delayMicroseconds (110); // prevents clock going sloooow while ((*(clk + PWMCLK_CNTL) & 0x80) != 0) // Wait for clock to be !BUSY delayMicroseconds (1); *(clk + PWMCLK_DIV) = BCM_PASSWORD | (divisor << 12); *(clk + PWMCLK_CNTL) = BCM_PASSWORD | 0x11; // Start PWM clock *(pwm + PWM_CONTROL) = pwm_control; // restore PWM_CONTROL if (wiringPiDebug) printf ("Set to: %d. Now : 0x%08X\n", divisor, *(clk + PWMCLK_DIV)); } } /* * gpioClockSet: * Set the frequency on a GPIO clock pin ********************************************************************************* */ void gpioClockSet (int pin, int freq) { int divi, divr, divf; int save = pin; // Only works on on-board pins if (pin > 63) { if (wiringPiDebug) { printf ("%s(%d)%s ERROR: Specified pin (%d) is not an on-board pin!\n", __FILE__, __LINE__, __FUNCTION__, pin); } return; } if (wiringPiMode == WPI_MODE_PINS) pin = pinToGpio[pin]; else if (wiringPiMode == WPI_MODE_PHYS) pin = physToGpio[pin]; else if (wiringPiMode != WPI_MODE_GPIO) return; divi = 19200000 / freq; divr = 19200000 % freq; divf = (int)((double)divr * 4096.0 / 19200000.0); if (divi > 4095) divi = 4095; // Fail if the pin isn't a GPIO clock pin if ((gpioToClkCon[pin] == -1) || (gpioToClkDiv[pin] == -1)) { if (wiringPiDebug) { printf ("%s(%d)%s ERROR: Specified pin (%d) is not a clock pin!\n", __FILE__, __LINE__, __FUNCTION__, save); } return; } *(clk + gpioToClkCon[pin]) = BCM_PASSWORD | GPIO_CLOCK_SOURCE; // Stop GPIO Clock while ((*(clk + gpioToClkCon[pin]) & 0x80) != 0) // ... and wait ; *(clk + gpioToClkDiv[pin]) = BCM_PASSWORD | (divi << 12) | divf; // Set dividers *(clk + gpioToClkCon[pin]) = BCM_PASSWORD | 0x10 | GPIO_CLOCK_SOURCE; // Start Clock } /* * wiringPiFindNode: * Locate our device node ********************************************************************************* */ struct wiringPiNodeStruct *wiringPiFindNode (int pin) { struct wiringPiNodeStruct *node = wiringPiNodes; while (node != NULL) if ((pin >= node->pinBase) && (pin <= node->pinMax)) return node; else node = node->next; return NULL; } /* * wiringPiNewNode: * Create a new GPIO node into the wiringPi handling system ********************************************************************************* */ static void pinModeDummy (UNUSED struct wiringPiNodeStruct *node, UNUSED int pin, UNUSED int mode) { return; } static void pullUpDnControlDummy (UNUSED struct wiringPiNodeStruct *node, UNUSED int pin, UNUSED int pud) { return; } static int digitalReadDummy (UNUSED struct wiringPiNodeStruct *node, UNUSED int UNUSED pin) { return LOW; } static void digitalWriteDummy (UNUSED struct wiringPiNodeStruct *node, UNUSED int pin, UNUSED int value) { return; } static void pwmWriteDummy (UNUSED struct wiringPiNodeStruct *node, UNUSED int pin, UNUSED int value) { return; } static int analogReadDummy (UNUSED struct wiringPiNodeStruct *node, UNUSED int pin) { return 0; } static void analogWriteDummy (UNUSED struct wiringPiNodeStruct *node, UNUSED int pin, UNUSED int value) { return; } struct wiringPiNodeStruct *wiringPiNewNode (int pinBase, int numPins) { int pin; struct wiringPiNodeStruct *node; // Minimum pin base is MAX_ONBOARD_PINS if (pinBase < MAX_ONBOARD_PINS) { (void)wiringPiFailure (WPI_FATAL, "wiringPiNewNode: pinBase of %d is not < %d\n", pinBase, MAX_ONBOARD_PINS); } // Check all pins in-case there is overlap: for (pin = pinBase; pin < (pinBase + numPins); ++pin) if (wiringPiFindNode (pin) != NULL) (void)wiringPiFailure (WPI_FATAL, "wiringPiNewNode: Pin %d overlaps with existing definition\n", pin); // Allocate memory. NOTE: calloc clears the memory before giving it to you. Bonus! node = (struct wiringPiNodeStruct *)calloc (sizeof (struct wiringPiNodeStruct), 1); // calloc zeros if (node == NULL) (void)wiringPiFailure (WPI_FATAL, "wiringPiNewNode: Unable to allocate memory: %s\n", strerror (errno)); node->pinBase = pinBase; node->pinMax = pinBase + numPins - 1; // Use dummy routines so as not to have NULL pointers. node->pinMode = pinModeDummy; node->pullUpDnControl = pullUpDnControlDummy; node->digitalRead = digitalReadDummy; node->digitalWrite = digitalWriteDummy; node->pwmWrite = pwmWriteDummy; node->analogRead = analogReadDummy; node->analogWrite = analogWriteDummy; node->next = wiringPiNodes; wiringPiNodes = node; return node; } /* ********************************************************************************* * Core Functions ********************************************************************************* */ /* * pinModeAlt: * This is an un-documented special to let you set any pin to any mode ********************************************************************************* */ void pinModeAlt (int pin, int mode) { int fSel, shift; setupCheck ("pinModeAlt"); if ((pin & PI_GPIO_MASK) == 0) // On-board pin { if (wiringPiMode == WPI_MODE_PINS) pin = pinToGpio[pin]; else if (wiringPiMode == WPI_MODE_PHYS) pin = physToGpio[pin]; else if (wiringPiMode != WPI_MODE_GPIO) return; fSel = gpioToGPFSEL[pin]; shift = gpioToShift [pin]; *(gpio + fSel) = (*(gpio + fSel) & ~(7 << shift)) | ((mode & 0x7) << shift); } } /* * pinMode: * Sets the mode of a pin to be input, output or PWM output ********************************************************************************* */ void pinMode (int pin, int mode) { int fSel, shift, alt; struct wiringPiNodeStruct *node = wiringPiNodes; int origPin = pin; setupCheck ("pinMode"); if ((pin & PI_GPIO_MASK) == 0) // On-board pin { if (wiringPiMode == WPI_MODE_PINS) pin = pinToGpio[pin]; else if (wiringPiMode == WPI_MODE_PHYS) pin = physToGpio[pin]; else if (wiringPiMode != WPI_MODE_GPIO) return; softPwmStop (origPin); softToneStop (origPin); fSel = gpioToGPFSEL[pin]; shift = gpioToShift [pin]; if (mode == INPUT) *(gpio + fSel) = (*(gpio + fSel) & ~(7 << shift)); // Sets bits to zero = input else if (mode == OUTPUT) *(gpio + fSel) = (*(gpio + fSel) & ~(7 << shift)) | (1 << shift); else if (mode == SOFT_PWM_OUTPUT) softPwmCreate (origPin, 0, 100); else if (mode == SOFT_TONE_OUTPUT) softToneCreate (origPin); else if (mode == PWM_TONE_OUTPUT) { pinMode (origPin, PWM_OUTPUT); // Call myself to enable PWM mode pwmSetMode (PWM_MODE_MS); } else if (mode == PWM_OUTPUT) { if ((alt = gpioToPwmALT[pin]) == 0) // Not a hardware capable PWM pin return; usingGpioMemCheck ("pinMode PWM"); // Set pin to PWM mode *(gpio + fSel) = (*(gpio + fSel) & ~(7 << shift)) | (alt << shift); delayMicroseconds (110); // See comments in pwmSetClockWPi pwmSetMode (PWM_MODE_BAL); // Pi default mode pwmSetRange (1024); // Default range of 1024 pwmSetClock (32); // 19.2 / 32 = 600KHz - Also starts the PWM } else if (mode == GPIO_CLOCK) { if ((alt = gpioToGpClkALT0[pin]) == 0) // Not a GPIO_CLOCK pin return; usingGpioMemCheck ("pinMode CLOCK"); // Set pin to GPIO_CLOCK mode and set the clock frequency to 100KHz *(gpio + fSel) = (*(gpio + fSel) & ~(7 << shift)) | (alt << shift); delayMicroseconds (110); gpioClockSet (pin, 100000); } } else { if ((node = wiringPiFindNode (pin)) != NULL) node->pinMode (node, pin, mode); return; } } /* * pullUpDownCtrl: * Control the internal pull-up/down resistors on a GPIO pin. ********************************************************************************* */ void pullUpDnControl (int pin, int pud) { struct wiringPiNodeStruct *node = wiringPiNodes; setupCheck ("pullUpDnControl"); if ((pin & PI_GPIO_MASK) == 0) // On-Board Pin { if (wiringPiMode == WPI_MODE_PINS) pin = pinToGpio[pin]; else if (wiringPiMode == WPI_MODE_PHYS) pin = physToGpio[pin]; else if (wiringPiMode != WPI_MODE_GPIO) return; if (piGpioPupOffset == GPPUPPDN0) { // Pi 4B pull up/down method int pullreg = GPPUPPDN0 + (pin>>4); int pullshift = (pin & 0xf) << 1; unsigned int pullbits; unsigned int pull; switch (pud) { case PUD_OFF: pull = 0; break; case PUD_UP: pull = 1; break; case PUD_DOWN: pull = 2; break; default: return; /* An illegal value */ } pullbits = *(gpio + pullreg); pullbits &= ~(3 << pullshift); pullbits |= (pull << pullshift); *(gpio + pullreg) = pullbits; } else { // legacy pull up/down method *(gpio + GPPUD) = pud & 3; delayMicroseconds (5); *(gpio + gpioToPUDCLK[pin]) = 1 << (pin & 31); delayMicroseconds (5); *(gpio + GPPUD) = 0; delayMicroseconds (5); *(gpio + gpioToPUDCLK[pin]) = 0; delayMicroseconds (5); } } else // Extension module { if ((node = wiringPiFindNode (pin)) != NULL) node->pullUpDnControl (node, pin, pud); return; } } /* * digitalRead: * Read the value of a given Pin, returning HIGH or LOW ********************************************************************************* */ int digitalRead (int pin) { char c; struct wiringPiNodeStruct *node = wiringPiNodes; if ((pin & PI_GPIO_MASK) == 0) // On-Board Pin { if (wiringPiMode == WPI_MODE_GPIO_SYS) // Sys mode { if (sysFds[pin] == -1) return LOW; lseek (sysFds[pin], 0L, SEEK_SET); read (sysFds[pin], &c, 1); return (c == '0') ? LOW : HIGH; } else if (wiringPiMode == WPI_MODE_PINS) pin = pinToGpio[pin]; else if (wiringPiMode == WPI_MODE_PHYS) pin = physToGpio[pin]; else if (wiringPiMode != WPI_MODE_GPIO) return LOW; if ((*(gpio + gpioToGPLEV[pin]) & (1 << (pin & 0x1F))) != 0) return HIGH; else return LOW; } else { if ((node = wiringPiFindNode (pin)) == NULL) return LOW; return node->digitalRead (node, pin); } } /* * digitalReadBank: * Read all 32 bits in a bank, returning a 32-bit unsigned int. * This only works in BCM GPIO pin numbering mode. ********************************************************************************* */ uint32_t digitalReadBank(int bank) { if (bank > 1) { return 0; } return (uint32_t)*(gpio + gpioToGPLEV[bank * 32]); } /* * digitalWrite: * Set an output bit ********************************************************************************* */ void digitalWrite (int pin, int value) { struct wiringPiNodeStruct *node = wiringPiNodes; if ((pin & PI_GPIO_MASK) == 0) // On-Board Pin { if (wiringPiMode == WPI_MODE_GPIO_SYS) // Sys mode { if (sysFds[pin] != -1) { if (value == LOW) write (sysFds[pin], "0\n", 2); else write (sysFds[pin], "1\n", 2); } return; } else if (wiringPiMode == WPI_MODE_PINS) pin = pinToGpio[pin]; else if (wiringPiMode == WPI_MODE_PHYS) pin = physToGpio[pin]; else if (wiringPiMode != WPI_MODE_GPIO) return; if (value == LOW) *(gpio + gpioToGPCLR[pin]) = 1 << (pin & 31); else *(gpio + gpioToGPSET[pin]) = 1 << (pin & 31); } else { if ((node = wiringPiFindNode (pin)) != NULL) node->digitalWrite (node, pin, value); } } /* * pwmWrite: * Set an output PWM value ********************************************************************************* */ void pwmWrite (int pin, int value) { struct wiringPiNodeStruct *node = wiringPiNodes; setupCheck ("pwmWrite"); if ((pin & PI_GPIO_MASK) == 0) // On-Board Pin { if (wiringPiMode == WPI_MODE_PINS) pin = pinToGpio[pin]; else if (wiringPiMode == WPI_MODE_PHYS) pin = physToGpio[pin]; else if (wiringPiMode != WPI_MODE_GPIO) return; usingGpioMemCheck ("pwmWrite"); *(pwm + gpioToPwmPort[pin]) = value; } else { if ((node = wiringPiFindNode (pin)) != NULL) node->pwmWrite (node, pin, value); } } /* * analogRead: * Read the analog value of a given Pin. * There is no on-board Pi analog hardware, * so this needs to go to a new node. ********************************************************************************* */ int analogRead (int pin) { struct wiringPiNodeStruct *node = wiringPiNodes; if ((node = wiringPiFindNode (pin)) == NULL) return 0; else return node->analogRead (node, pin); } /* * analogWrite: * Write the analog value to the given Pin. * There is no on-board Pi analog hardware, * so this needs to go to a new node. ********************************************************************************* */ void analogWrite (int pin, int value) { struct wiringPiNodeStruct *node = wiringPiNodes; if ((node = wiringPiFindNode (pin)) == NULL) return; node->analogWrite (node, pin, value); } /* * pwmToneWrite: * Pi Specific. * Output the given frequency on the Pi's PWM pin ********************************************************************************* */ void pwmToneWrite (int pin, int freq) { int range; setupCheck ("pwmToneWrite"); if (freq == 0) pwmWrite (pin, 0); // Off else { range = 600000 / freq; pwmSetRange (range); pwmWrite (pin, freq / 2); } } /* * digitalWriteByte: * digitalReadByte: * Pi Specific * Write an 8-bit byte to the first 8 GPIO pins - try to do it as * fast as possible. * However it still needs 2 operations to set the bits, so any external * hardware must not rely on seeing a change as there will be a change * to set the outputs bits to zero, then another change to set the 1's * Reading is just bit fiddling. * These are wiringPi pin numbers 0..7, * or BCM_GPIO pin numbers: * 17, 18, 27, 22, 23, 24, 25, 4 on a Pi v1 rev 3 onwards or B+, 2, 3, zero ********************************************************************************* */ void digitalWriteByte (const int value) { uint32_t pinSet = 0; uint32_t pinClr = 0; int mask = 1; int pin; if (wiringPiMode == WPI_MODE_GPIO_SYS) { for (pin = 0; pin < 8; ++pin) { digitalWrite (pinToGpio[pin], value & mask); mask <<= 1; } return; } else { for (pin = 0; pin < 8; ++pin) { if ((value & mask) == 0) pinClr |= (1 << pinToGpio[pin]); else pinSet |= (1 << pinToGpio[pin]); mask <<= 1; } *(gpio + gpioToGPCLR[0]) = pinClr; *(gpio + gpioToGPSET[0]) = pinSet; } } unsigned int digitalReadByte (void) { int pin, x; uint32_t raw; uint32_t data = 0; if (wiringPiMode == WPI_MODE_GPIO_SYS) { for (pin = 0; pin < 8; ++pin) { x = digitalRead (pinToGpio[pin]); data = (data << 1) | x; } } else { raw = *(gpio + gpioToGPLEV[0]); // First bank for these pins for (pin = 0; pin < 8; ++pin) { x = pinToGpio[pin]; data = (data << 1) | (((raw & (1 << x)) == 0) ? 0 : 1); } } return data; } /* * digitalWriteByte2: * digitalReadByte2: * Pi Specific * Write an 8-bit byte to the second set of 8 GPIO pins. This is marginally * faster than the first lot as these are consecutive BCM_GPIO pin numbers. * However they overlap with the original read/write bytes. ********************************************************************************* */ void digitalWriteByte2 (const int value) { register int mask = 1; register int pin; if (wiringPiMode == WPI_MODE_GPIO_SYS) { for (pin = 20; pin < 28; ++pin) { digitalWrite (pin, value & mask); mask <<= 1; } return; } else { *(gpio + gpioToGPCLR[0]) = (~value & 0xFF) << 20; // 0x0FF00000; ILJ > CHANGE: Old causes glitch *(gpio + gpioToGPSET[0]) = ( value & 0xFF) << 20; } } unsigned int digitalReadByte2 (void) { int pin, x; uint32_t data = 0; if (wiringPiMode == WPI_MODE_GPIO_SYS) { for (pin = 20; pin < 28; ++pin) { x = digitalRead (pin); data = (data << 1) | x; } } else data = ((*(gpio + gpioToGPLEV[0])) >> 20) & 0xFF; // First bank for these pins return data; } /* * waitForInterrupt: * Pi Specific. * Wait for Interrupt on a GPIO pin. * This is actually done via the /sys/class/gpio interface regardless of * the wiringPi access mode in-use. Maybe sometime it might get a better * way for a bit more efficiency. * Returns output of poll(): 1 on success, 0 on timeout, -1 on error. ********************************************************************************* */ int waitForInterrupt (int pin, int mS) { int fd, x; uint8_t c; struct pollfd polls; if (wiringPiMode == WPI_MODE_PINS) pin = pinToGpio[pin]; else if (wiringPiMode == WPI_MODE_PHYS) pin = physToGpio[pin]; if ((fd = sysFds[pin]) == -1) return -2; // Setup poll structure polls.fd = fd; polls.events = POLLPRI | POLLERR; // Wait for it ... x = poll (&polls, 1, mS); // If no error, do a dummy read to clear the interrupt // A one character read appars to be enough. if (x > 0) { lseek (fd, 0, SEEK_SET); // Rewind (void)read (fd, &c, 1); // Read & clear } return x; } /* * interruptHandler: * This is a thread that gets started to wait for the interrupt we're * hoping to catch. It will call the user-function when the interrupt * fires. ********************************************************************************* */ static void *interruptHandler (void *arg) { int myPin = (int)arg; (void)piHiPri (55); // Only effective if we run as root for (;;) { if (waitForInterrupt (myPin, -1) > 0) { isrFunctions[myPin](myPin); } } return NULL; } /* * wiringPiISR: * Pi Specific. * Take the details and create an interrupt handler that will do a callback * to the user-supplied function. * Returns 0 on success, -1 on failure (or program exits if !wiringPiReturnCodes) ********************************************************************************* */ int wiringPiISR (int pin, int mode, void (*function)(int)) { pthread_t threadId; const char *modeS; char fName[64]; char pinS[8]; pid_t pid; int count; char c; int bcmGpioPin; if ((pin < 0) || (pin > 63)) { return wiringPiFailure (WPI_FATAL, "wiringPiISR: pin must be 0-63 (%d)\n", pin); } if (wiringPiMode == WPI_MODE_UNINITIALISED) { return wiringPiFailure (WPI_FATAL, "wiringPiISR: wiringPi has not been initialised. Unable to continue.\n"); } else if (wiringPiMode == WPI_MODE_PINS) { bcmGpioPin = pinToGpio[pin]; } else if (wiringPiMode == WPI_MODE_PHYS) { bcmGpioPin = physToGpio[pin]; } else { bcmGpioPin = pin; } // Now export the pin and set the right edge // We're going to use the gpio program to do this, so it assumes // a full installation of wiringPi. It's a bit 'clunky', but it // is a way that will work when we're running in "Sys" mode, as // a non-root user. (without sudo) if (mode != INT_EDGE_SETUP) { if (mode == INT_EDGE_FALLING) { modeS = "falling"; } else if (mode == INT_EDGE_RISING) { modeS = "rising"; } else { modeS = "both"; } sprintf (pinS, "%d", bcmGpioPin); if ((pid = fork ()) < 0) // Fail { return wiringPiFailure (WPI_FATAL, "wiringPiISR: fork failed: %s\n", strerror (errno)); } if (pid == 0) // Child, execl (doesn't return if successful) { if (access ("/usr/local/bin/gpio", X_OK) == 0) { execl ("/usr/local/bin/gpio", "gpio", "edge", pinS, modeS, (char *)NULL); return wiringPiFailure (WPI_FATAL, "wiringPiISR: execl failed: %s\n", strerror (errno)); } else if (access ("/usr/bin/gpio", X_OK) == 0) { execl ("/usr/bin/gpio", "gpio", "edge", pinS, modeS, (char *)NULL); return wiringPiFailure (WPI_FATAL, "wiringPiISR: execl failed: %s\n", strerror (errno)); } else return wiringPiFailure (WPI_FATAL, "wiringPiISR: Can't find gpio program\n"); } else // Parent, wait for child's execl call to finish { waitpid (pid, NULL, 0); } } // Parent continues... // Now pre-open the /sys/class node - but it may already be open if // we are in Sys mode... if (sysFds[bcmGpioPin] == -1) { sprintf (fName, "/sys/class/gpio/gpio%d/value", bcmGpioPin); if ((sysFds[bcmGpioPin] = open (fName, O_RDWR)) < 0) return wiringPiFailure (WPI_FATAL, "wiringPiISR: unable to open %s: %s\n", fName, strerror (errno)); } // Clear any initial pending interrupt ioctl (sysFds[bcmGpioPin], FIONREAD, &count); for (int i = 0; i < count; ++i) { read (sysFds[bcmGpioPin], &c, 1); } // Save caller's callback function isrFunctions[bcmGpioPin] = function; pthread_mutex_lock (&pinMutex); pthread_create (&threadId, NULL, interruptHandler, (void *)bcmGpioPin); pthread_mutex_unlock (&pinMutex); return 0; } /* * wiringPiISRmulti: * Pi Specific. * Create an interrupt handler that will do a callback to the user-supplied function * when any of the specified pins changes according to mode. * Returns 0 on success, -1 on failure (or program exits if !wiringPiReturnCodes) ********************************************************************************* */ int wiringPiISRmulti (int pins[], int n_pins, int mode, void (*function)(int)) { pthread_t threadId; const char *modeS; char fName[64]; char pinS[8]; pid_t pid; int count; char c; int bcmGpioPins[MAX_ONBOARD_PINS]; if (n_pins < 1) { return wiringPiFailure (WPI_FATAL, "wiringPiISRmulti: Must specify at least one pin.\n"); } // Translate pin list to list of BCM GPIO pins for (int i=0; i < n_pins; ++i) { int pin = pins[i]; if ((pin < 0) || (pin > 63)) { return wiringPiFailure (WPI_FATAL, "wiringPiISRmulti: pin must be 0-63 (%d)\n", pin); } if (wiringPiMode == WPI_MODE_UNINITIALISED) { return wiringPiFailure (WPI_FATAL, "wiringPiISRmulti: wiringPi has not been initialised. Unable to continue.\n"); } else if (wiringPiMode == WPI_MODE_PINS) { bcmGpioPins[i] = pinToGpio[pin]; } else if (wiringPiMode == WPI_MODE_PHYS) { bcmGpioPins[i] = physToGpio[pin]; } else { bcmGpioPins[i] = pin; } } // Now export the pins and set the appropriate edge. // We're going to use the gpio program to do this, so it assumes // a full installation of wiringPi. It's a bit 'clunky', but it // is a way that will work when we're running in "Sys" mode, as // a non-root user. (without sudo) if (mode != INT_EDGE_SETUP) { if (mode == INT_EDGE_FALLING) { modeS = "falling"; } else if (mode == INT_EDGE_RISING) { modeS = "rising"; } else { modeS = "both"; } // Export each pin in the list for (int i=0; i < n_pins; ++i) { sprintf (pinS, "%d", bcmGpioPins[i]); if ((pid = fork ()) < 0) // Fail { return wiringPiFailure (WPI_FATAL, "wiringPiISRmulti: fork failed: %s\n", strerror (errno)); } if (pid == 0) // Child, execl (doesn't return if successful) { if (access ("/usr/local/bin/gpio", X_OK) == 0) { execl ("/usr/local/bin/gpio", "gpio", "edge", pinS, modeS, (char *)NULL); return wiringPiFailure (WPI_FATAL, "wiringPiISRmulti: execl failed: %s\n", strerror (errno)); } else if (access ("/usr/bin/gpio", X_OK) == 0) { execl ("/usr/bin/gpio", "gpio", "edge", pinS, modeS, (char *)NULL); return wiringPiFailure (WPI_FATAL, "wiringPiISRmulti: execl failed: %s\n", strerror (errno)); } else return wiringPiFailure (WPI_FATAL, "wiringPiISRmulti: Can't find gpio program\n"); } else // Parent, wait for child's execl call to finish { waitpid (pid, NULL, 0); } } // end for(pin#) } // end if (mode != INT_EDGE_SETUP) // Parent continues... for (int i=0; i < n_pins; ++i) { int bcmGpioPin = bcmGpioPins[i]; // Now pre-open the /sys/class node - but it may already be open if // we are in Sys mode... if (sysFds[bcmGpioPin] == -1) { sprintf (fName, "/sys/class/gpio/gpio%d/value", bcmGpioPin); if ((sysFds[bcmGpioPin] = open (fName, O_RDWR)) < 0) return wiringPiFailure (WPI_FATAL, "wiringPiISRmulti: unable to open %s: %s\n", fName, strerror (errno)); } // Clear any initial pending interrupt ioctl (sysFds[bcmGpioPin], FIONREAD, &count); for (int i = 0; i < count; ++i) { read (sysFds[bcmGpioPin], &c, 1); } // Save caller's callback function isrFunctions[bcmGpioPin] = function; // Create a separate pthread_mutex_lock (&pinMutex); pthread_create (&threadId, NULL, interruptHandler, (void *)bcmGpioPin); pthread_mutex_unlock (&pinMutex); } // end for(pin#) return 0; } /* * initialiseEpoch: * Initialise our start-of-time variable to be the current unix * time in milliseconds and microseconds. ********************************************************************************* */ static void initialiseEpoch (void) { struct timespec ts; clock_gettime (CLOCK_MONOTONIC_RAW, &ts); epochMilli = (uint64_t)ts.tv_sec * (uint64_t)1000 + (uint64_t)(ts.tv_nsec / 1000000L); epochMicro = (uint64_t)ts.tv_sec * (uint64_t)1000000 + (uint64_t)(ts.tv_nsec / 1000L); } /* * delay: * Wait for some number of milliseconds ********************************************************************************* */ void delay (unsigned int milliseconds) { #if 0 struct timespec sleeper, dummy; sleeper.tv_sec = (time_t)(howLong / 1000); sleeper.tv_nsec = (long)(howLong % 1000) * 1000000; nanosleep (&sleeper, &dummy); #else usleep(milliseconds * 1000); #endif } /* * delayMicroseconds: * It seems that a single call to nanosleep takes 80 to 130 * microseconds anyway, so while obeying the standards (may take longer), * it's not optimal. * * So what I'll do now is if the delay is less than 100uS we'll do it * in a hard loop, watching a built-in counter on the ARM chip. This is * somewhat sub-optimal in that it uses 100% CPU, something not an issue * in a microcontroller, but under a multi-tasking, multi-user OS, it's * wastefull, however we've no real choice )-: * * Plan B: It seems all might not be well with that plan, so changing it * to use gettimeofday () and poll on that instead... ********************************************************************************* */ void delayMicrosecondsHard (unsigned int microseconds) { struct timeval tNow, tLong, tEnd; gettimeofday (&tNow, NULL); tLong.tv_sec = microseconds / 1000000; tLong.tv_usec = microseconds % 1000000; timeradd (&tNow, &tLong, &tEnd); while (timercmp (&tNow, &tEnd, <)) gettimeofday (&tNow, NULL); } void delayMicroseconds (unsigned int microseconds) { #if 0 struct timespec sleeper; unsigned int uSecs = microseconds % 1000000; unsigned int wSecs = microseconds / 1000000; if (microseconds == 0) return; else if (microseconds < 100) delayMicrosecondsHard (microseconds); else { sleeper.tv_sec = wSecs; sleeper.tv_nsec = (long)(uSecs * 1000L); nanosleep (&sleeper, NULL); } #else if (microseconds == 0) return; else if (microseconds < 100) delayMicrosecondsHard (microseconds); else { usleep(microseconds); } #endif } /* * millis: * Return a number of milliseconds as an unsigned int. * Wraps at 49 days. ********************************************************************************* */ unsigned int millis (void) { uint64_t now; struct timespec ts; clock_gettime (CLOCK_MONOTONIC_RAW, &ts); now = (uint64_t)ts.tv_sec * (uint64_t)1000 + (uint64_t)(ts.tv_nsec / 1000000L); return (uint32_t)(now - epochMilli); } /* * micros: * Return a number of microseconds as an unsigned int. * Wraps after 71 minutes. ********************************************************************************* */ unsigned int micros (void) { uint64_t now; struct timespec ts; clock_gettime (CLOCK_MONOTONIC_RAW, &ts); now = (uint64_t)ts.tv_sec * (uint64_t)1000000 + (uint64_t)(ts.tv_nsec / 1000); return (uint32_t)(now - epochMicro); } /* * wiringPiVersion: * Return our current version number ********************************************************************************* */ void wiringPiVersion (int *major, int *minor) { *major = VERSION_MAJOR; *minor = VERSION_MINOR; } /* * wiringPiSetup: * Must be called once at the start of your program execution. * * Default setup: Initialises the system into wiringPi Pin mode and uses the * memory mapped hardware directly. * * Changed now to revert to "gpio" mode if we're running on a Compute Module. ********************************************************************************* */ int wiringPiSetup (void) { int fd; int model, proc, rev, mem, maker, overVolted; // Exit with OK status if this has already been called. if (wiringPiSetuped) { return 0; } wiringPiSetuped = TRUE; // ------------------------------------------------------ if (getenv (ENV_DEBUG) != NULL) { wiringPiDebug = TRUE; } if (getenv (ENV_CODES) != NULL) { wiringPiReturnCodes = TRUE; } if (wiringPiDebug) { printf ("wiringPi: wiringPiSetup called\n"); } // ------------------------------------------------------ // Get the board ID information. We're not really using the information here, // but it will give us information like the GPIO layout scheme (2 variants // on the older 26-pin Pi's) and the GPIO peripheral base address. // and if we're running on a compute module, then wiringPi pin numbers // don't really many anything, so force native BCM mode anyway. piBoardId (&model, &proc, &rev, &mem, &maker, &overVolted); // Set default GPIO/pin mode. if ((model == PI_MODEL_CM1) || (model == PI_MODEL_CM3) || (model == PI_MODEL_CM3P)) { // Compute modules don't use WiringPi pin mode (virtual pins) wiringPiMode = WPI_MODE_GPIO; // Broadcom GPIO pin numbers } else { // WiringPi pin mode wiringPiMode = WPI_MODE_PINS; // Virtual pin numbers 0 through 16 } if (piGpioLayout() == 1) // A, B, Rev 1, 1.1 (Oldest boards) { pinToGpio = pinToGpioR1; physToGpio = physToGpioR1; } else // A2, B2, A+, B+, CM, Pi2, Pi3, Zero, Zero W, Zero 2 W { pinToGpio = pinToGpioR2; physToGpio = physToGpioR2; } // BCM2835: Raspberry Pi 1 Models A, A+, B, B+, the Raspberry Pi Zero, the Raspberry Pi Zero W, and the Raspberry Pi Compute Module 1 // BCM2836: Raspberry Pi 2 Model B (essentially identical to BCM2835) // BCM2837: Raspberry Pi 3 Model B, later models of the Raspberry Pi 2 Model B, and the Raspberry Pi Compute Module 3 // (essentially identical to BCM2836) // BCM2837B0: Raspberry Pi 3 Models A+, B+, and the Raspberry Pi Compute Module 3+ (essentially identical to BCM2837) // RP3A0 (BCM2710A1): Raspberry Pi Zero 2 W // BCM2710A1 = silicon die packaged inside the Broadcom BCM2837 chip which is used on the Raspberry Pi 3 switch (model) { case PI_MODEL_A: case PI_MODEL_AP: case PI_MODEL_B: case PI_MODEL_BP: case PI_MODEL_ZERO: case PI_MODEL_ZERO_W: case PI_MODEL_CM1: case PI_ALPHA: piGpioBase = GPIO_PERI_BASE_OLD; piGpioPupOffset = GPPUD; break; case PI_MODEL_4B: case PI_MODEL_400: case PI_MODEL_CM4: // BCM2711: Raspberry Pi 4 Model B, the Raspberry Pi 400, and the Raspberry Pi Compute Module 4 piGpioBase = GPIO_PERI_BASE_2711; piGpioPupOffset = GPPUPPDN0; break; default: // PI_MODEL_2B PI_MODEL_3AP PI_MODEL_3B PI_MODEL_3BP PI_MODEL_CM3P PI_MODEL_CM3 piGpioBase = GPIO_PERI_BASE_2835; piGpioPupOffset = GPPUD; break; } // ------------------------------------------------------ // Open the master /dev/ memory control device // Device strategy: December 2016: // Try /dev/mem. If that fails, then // try /dev/gpiomem. If that fails then game over. if ((fd = open ("/dev/mem", O_RDWR | O_SYNC | O_CLOEXEC)) < 0) { if ((fd = open ("/dev/gpiomem", O_RDWR | O_SYNC | O_CLOEXEC) ) >= 0) // We're using gpiomem { piGpioBase = 0; usingGpioMem = TRUE; } else return wiringPiFailure (WPI_NON_FATAL, "wiringPiSetup: Unable to open /dev/mem or /dev/gpiomem: %s.\n" " Aborting your program because it must be able to access the GPIO hardware.\n" " NOTE: You may need to run with sudo.\n", strerror (errno)); } // Set the offsets into the memory interface. GPIO_PADS = piGpioBase + 0x00100000; GPIO_CLOCK_BASE = piGpioBase + 0x00101000; GPIO_BASE = piGpioBase + 0x00200000; GPIO_TIMER = piGpioBase + 0x0000B000; GPIO_PWM = piGpioBase + 0x0020C000; // Map the individual hardware components // GPIO: gpio = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, GPIO_BASE); if (gpio == MAP_FAILED) return wiringPiFailure (WPI_NON_FATAL, "wiringPiSetup: mmap (GPIO) failed: %s\n", strerror (errno)); // PWM pwm = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, GPIO_PWM); if (pwm == MAP_FAILED) return wiringPiFailure (WPI_NON_FATAL, "wiringPiSetup: mmap (PWM) failed: %s\n", strerror (errno)); // Clock control (needed for PWM) clk = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, GPIO_CLOCK_BASE); if (clk == MAP_FAILED) return wiringPiFailure (WPI_NON_FATAL, "wiringPiSetup: mmap (CLOCK) failed: %s\n", strerror (errno)); // The drive pads pads = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, GPIO_PADS); if (pads == MAP_FAILED) return wiringPiFailure (WPI_NON_FATAL, "wiringPiSetup: mmap (PADS) failed: %s\n", strerror (errno)); // The system timer timer = (uint32_t *)mmap(0, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, GPIO_TIMER); if (timer == MAP_FAILED) return wiringPiFailure (WPI_NON_FATAL, "wiringPiSetup: mmap (TIMER) failed: %s\n", strerror (errno)); // ------------------------------------------------------ // Set the timer to free-running, 1MHz. // 0xF9 is 249, the timer divide is base clock / (divide+1) // so base clock is 250MHz / 250 = 1MHz. *(timer + TIMER_CONTROL) = 0x0000280; *(timer + TIMER_PRE_DIV) = 0x00000F9; timerIrqRaw = timer + TIMER_IRQ_RAW; // ------------------------------------------------------ // Export the base addresses for any external software that might need them _wiringPiGpio = gpio; _wiringPiPwm = pwm; _wiringPiClk = clk; _wiringPiPads = pads; _wiringPiTimer = timer; // ------------------------------------------------------ initialiseEpoch (); return 0; } /* * wiringPiSetupGpio: * Must be called once at the start of your program execution. * * GPIO setup: Initialises the system into GPIO Pin mode and uses the * memory mapped hardware directly. ********************************************************************************* */ int wiringPiSetupGpio (void) { (void)wiringPiSetup (); if (wiringPiDebug) printf ("wiringPi: wiringPiSetupGpio called\n"); wiringPiMode = WPI_MODE_GPIO; return 0; } /* * wiringPiSetupPhys: * Must be called once at the start of your program execution. * * Phys setup: Initialises the system into Physical Pin mode and uses the * memory mapped hardware directly. ********************************************************************************* */ int wiringPiSetupPhys (void) { (void)wiringPiSetup (); if (wiringPiDebug) printf ("wiringPi: wiringPiSetupPhys called\n"); wiringPiMode = WPI_MODE_PHYS; return 0; } /* * wiringPiSetupSys: * Must be called once at the start of your program execution. * * Initialisation (again), however this time we are using the /sys/class/gpio * interface to the GPIO systems - slightly slower, but always usable as * a non-root user, assuming the devices are already exported and setup correctly. */ int wiringPiSetupSys (void) { int pin; char fName[128]; if (wiringPiSetuped) return 0; wiringPiSetuped = TRUE; if (getenv (ENV_DEBUG) != NULL) wiringPiDebug = TRUE; if (getenv (ENV_CODES) != NULL) wiringPiReturnCodes = TRUE; if (wiringPiDebug) printf ("wiringPi: wiringPiSetupSys called\n"); if (piGpioLayout () == 1) { pinToGpio = pinToGpioR1; physToGpio = physToGpioR1; } else { pinToGpio = pinToGpioR2; physToGpio = physToGpioR2; } // Open and scan the directory, looking for exported GPIOs, and pre-open // the 'value' interface to speed things up for later for (pin = 0; pin < MAX_ONBOARD_PINS; ++pin) { sprintf (fName, "/sys/class/gpio/gpio%d/value", pin); sysFds[pin] = open (fName, O_RDWR); } initialiseEpoch (); wiringPiMode = WPI_MODE_GPIO_SYS; return 0; }