WiringPi/wiringPi/wiringPi.h

/*
 * wiringPi.h:
 *	Arduino like Wiring library for the Raspberry Pi.
 *	Copyright (c) 2012-2017 Gordon Henderson
 ***********************************************************************
 * This file is part of wiringPi:
 *	https://github.com/WiringPi/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 <http://www.gnu.org/licenses/>.
 ***********************************************************************
 */

#ifndef	__WIRING_PI_H__
#define	__WIRING_PI_H__

// C doesn't have true/false by default and I can never remember which
//	way round they are, so ...
//	(and yes, I know about stdbool.h but I like capitals for these and I'm old)

#ifndef	TRUE
#  define	TRUE	(1==1)
#  define	FALSE	(!TRUE)
#endif

// GCC warning suppressor

#define	UNU	__attribute__((unused))

// Mask for the bottom 64 pins which belong to the Raspberry Pi
//	The others are available for the other devices

#define	PI_GPIO_MASK	(0xFFFFFFC0)

// Handy defines

// wiringPi modes

#define	WPI_MODE_PINS		          0
#define	WPI_MODE_GPIO		          1
#define	WPI_MODE_GPIO_SYS	        2  // deprecated since 3.2
#define	WPI_MODE_PHYS		          3
#define	WPI_MODE_PIFACE		        4
#define	WPI_MODE_GPIO_DEVICE_BCM  5  // BCM pin numbers like WPI_MODE_GPIO
#define	WPI_MODE_GPIO_DEVICE_WPI  6  // WiringPi pin numbers like WPI_MODE_PINS
#define	WPI_MODE_GPIO_DEVICE_PHYS 7  // Physic pin numbers like WPI_MODE_PHYS
#define	WPI_MODE_UNINITIALISED -1

// Pin modes

#define	INPUT			 0
#define	OUTPUT			 1
#define	PWM_OUTPUT		 2
#define	GPIO_CLOCK		 3
#define	SOFT_PWM_OUTPUT		 4
#define	SOFT_TONE_OUTPUT	 5
#define	PWM_TONE_OUTPUT		 6
#define	PM_OFF		         7   // to input / release line

#define	LOW			 0
#define	HIGH			 1

// Pull up/down/none

#define	PUD_OFF			 0
#define	PUD_DOWN		 1
#define	PUD_UP			 2

// PWM

#define	PWM_MODE_MS		0
#define	PWM_MODE_BAL		1

// Interrupt levels

#define	INT_EDGE_SETUP		0
#define	INT_EDGE_FALLING	1
#define	INT_EDGE_RISING		2
#define	INT_EDGE_BOTH		3

// Pi model types and version numbers
//	Intended for the GPIO program Use at your own risk.
// https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#new-style-revision-codes

#define	PI_MODEL_A		 0
#define	PI_MODEL_B		 1
#define	PI_MODEL_AP		 2
#define	PI_MODEL_BP		 3
#define	PI_MODEL_2		 4
#define	PI_ALPHA		 5
#define	PI_MODEL_CM		 6
#define	PI_MODEL_07		 7
#define	PI_MODEL_3B		 8
#define	PI_MODEL_ZERO		 9
#define	PI_MODEL_CM3		10
#define	PI_MODEL_ZERO_W		12
#define	PI_MODEL_3BP 		13
#define	PI_MODEL_3AP 		14
#define	PI_MODEL_CM3P 		16
#define	PI_MODEL_4B 		17
#define	PI_MODEL_ZERO_2W	18
#define	PI_MODEL_400		19
#define	PI_MODEL_CM4		20
#define	PI_MODEL_CM4S		21
#define	PI_MODEL_5		  23

#define	PI_VERSION_1		0
#define	PI_VERSION_1_1		1
#define	PI_VERSION_1_2		2
#define	PI_VERSION_2		3

#define	PI_MAKER_SONY		0
#define	PI_MAKER_EGOMAN		1
#define	PI_MAKER_EMBEST		2
#define	PI_MAKER_UNKNOWN	3

#define GPIO_LAYOUT_PI1_REV1 1   //Pi 1 A/B Revision 1, 1.1, CM
#define GPIO_LAYOUT_DEFAULT  2

extern const char *piModelNames    [24] ;
extern const char *piProcessor     [ 5] ;
extern const char *piRevisionNames [16] ;
extern const char *piMakerNames    [16] ;
extern const int   piMemorySize    [ 8] ;


//	Intended for the GPIO program Use at your own risk.

// Threads

#define	PI_THREAD(X)	void *X (UNU void *dummy)

// Failure modes

#define	WPI_FATAL	(1==1)
#define	WPI_ALMOST	(1==2)


// wiringPiNodeStruct:
//	This describes additional device nodes in the extended wiringPi
//	2.0 scheme of things.
//	It's a simple linked list for now, but will hopefully migrate to
//	a binary tree for efficiency reasons - but then again, the chances
//	of more than 1 or 2 devices being added are fairly slim, so who
//	knows....

struct wiringPiNodeStruct
{
  int     pinBase ;
  int     pinMax ;

  int          fd ;	// Node specific
  unsigned int data0 ;	//  ditto
  unsigned int data1 ;	//  ditto
  unsigned int data2 ;	//  ditto
  unsigned int data3 ;	//  ditto

           void   (*pinMode)          (struct wiringPiNodeStruct *node, int pin, int mode) ;
           void   (*pullUpDnControl)  (struct wiringPiNodeStruct *node, int pin, int mode) ;
           int    (*digitalRead)      (struct wiringPiNodeStruct *node, int pin) ;
//unsigned int    (*digitalRead8)     (struct wiringPiNodeStruct *node, int pin) ;
           void   (*digitalWrite)     (struct wiringPiNodeStruct *node, int pin, int value) ;
//         void   (*digitalWrite8)    (struct wiringPiNodeStruct *node, int pin, int value) ;
           void   (*pwmWrite)         (struct wiringPiNodeStruct *node, int pin, int value) ;
           int    (*analogRead)       (struct wiringPiNodeStruct *node, int pin) ;
           void   (*analogWrite)      (struct wiringPiNodeStruct *node, int pin, int value) ;

  struct wiringPiNodeStruct *next ;
} ;

extern struct wiringPiNodeStruct *wiringPiNodes ;

// Export variables for the hardware pointers

extern volatile unsigned int *_wiringPiGpio ;
extern volatile unsigned int *_wiringPiPwm ;
extern volatile unsigned int *_wiringPiClk ;
extern volatile unsigned int *_wiringPiPads ;
extern volatile unsigned int *_wiringPiTimer ;
extern volatile unsigned int *_wiringPiTimerIrqRaw ;


// Function prototypes
//	c++ wrappers thanks to a comment by Nick Lott
//	(and others on the Raspberry Pi forums)

#ifdef __cplusplus
extern "C" {
#endif

// Data

// Internal
extern void piGpioLayoutOops (const char *why);
extern int wiringPiFailure (int fatal, const char *message, ...) ;

// Core wiringPi functions

extern struct wiringPiNodeStruct *wiringPiFindNode (int pin) ;
extern struct wiringPiNodeStruct *wiringPiNewNode  (int pinBase, int numPins) ;

enum WPIPinType {
  WPI_PIN_BCM = 1,
  WPI_PIN_WPI,
  WPI_PIN_PHYS,
};

extern void wiringPiVersion	(int *major, int *minor) ;
extern int  wiringPiGlobalMemoryAccess(void);                 //Interface V3.3
extern int  wiringPiUserLevelAccess (void) ;
extern int  wiringPiSetup       (void) ;
extern int  wiringPiSetupSys    (void) ;
extern int  wiringPiSetupGpio   (void) ;
extern int  wiringPiSetupPhys   (void) ;
extern int  wiringPiSetupPinType (enum WPIPinType pinType);   //Interface V3.3
extern int  wiringPiSetupGpioDevice(enum WPIPinType pinType); //Interface V3.3


enum WPIPinAlt {
  WPI_ALT_UNKNOWN = -1,
  WPI_ALT_INPUT = 0,
  WPI_ALT_OUTPUT,
  WPI_ALT5,
  WPI_ALT4,
  WPI_ALT0,
  WPI_ALT1,
  WPI_ALT2,
  WPI_ALT3,
  WPI_ALT6,
  WPI_ALT7,
  WPI_ALT8,
  WPI_ALT9,
  WPI_NONE = 0x1F,  // Pi5 default
};


extern          int  wiringPiGpioDeviceGetFd();               //Interface V3.3
extern          void pinModeAlt          (int pin, int mode) ;
extern          enum WPIPinAlt getPinModeAlt       (int pin) ;  // Interface V3.5, same as getAlt but wie enum
extern          void pinMode             (int pin, int mode) ;
extern          void pullUpDnControl     (int pin, int pud) ;
extern          int  digitalRead         (int pin) ;
extern          void digitalWrite        (int pin, int value) ;
extern unsigned int  digitalRead8        (int pin) ;
extern          void digitalWrite8       (int pin, int value) ;
extern          void pwmWrite            (int pin, int value) ;
extern          int  analogRead          (int pin) ;
extern          void analogWrite         (int pin, int value) ;

// PiFace specifics
//	(Deprecated)

extern int  wiringPiSetupPiFace (void) ;
extern int  wiringPiSetupPiFaceForGpioProg (void) ;	// Don't use this - for gpio program only

// On-Board Raspberry Pi hardware specific stuff

extern          int  piGpioLayout        (void) ;
extern          int  piBoardRev          (void) ;	// Deprecated, but does the same as piGpioLayout
extern          void piBoardId           (int *model, int *rev, int *mem, int *maker, int *overVolted) ;
extern          int  wpiPinToGpio        (int wpiPin) ;
extern          int  physPinToGpio       (int physPin) ;
extern          void setPadDrive         (int group, int value) ;
extern          void setPadDrivePin      (int pin, int value);     // Interface V3.0
extern          int  getAlt              (int pin) ;
extern          void pwmToneWrite        (int pin, int freq) ;
extern          void pwmSetMode          (int mode) ;
extern          void pwmSetRange         (unsigned int range) ;
extern          void pwmSetClock         (int divisor) ;
extern          void gpioClockSet        (int pin, int freq) ;
extern unsigned int  digitalReadByte     (void) ;
extern unsigned int  digitalReadByte2    (void) ;
extern          void digitalWriteByte    (int value) ;
extern          void digitalWriteByte2   (int value) ;

// Interrupts
//	(Also Pi hardware specific)

extern int  waitForInterrupt    (int pin, int mS) ;
extern int  wiringPiISR         (int pin, int mode, void (*function)(void)) ;
extern int  wiringPiISRStop     (int pin) ;  //V3.2
extern int  waitForInterruptClose(int pin) ; //V3.2

// Threads

extern int  piThreadCreate      (void *(*fn)(void *)) ;
extern void piLock              (int key) ;
extern void piUnlock            (int key) ;

// Schedulling priority

extern int piHiPri (const int pri) ;

// Extras from arduino land

extern void         delay             (unsigned int howLong) ;
extern void         delayMicroseconds (unsigned int howLong) ;
extern unsigned int millis            (void) ;
extern unsigned int micros            (void) ;

#ifdef __cplusplus
}
#endif

#endif