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@@ -24,6 +24,7 @@ |
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#include <stdio.h> |
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#include <stdio.h> |
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#include <unistd.h> |
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#include <stdint.h> |
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#include <stdint.h> |
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#include <stdlib.h> |
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#include <stdlib.h> |
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#include <fcntl.h> |
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#include <fcntl.h> |
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@@ -32,9 +33,7 @@ |
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#include <sys/ioctl.h> |
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#include <sys/ioctl.h> |
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#include <asm/ioctl.h> |
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#include <asm/ioctl.h> |
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#include <linux/spi/spidev.h> |
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#include <linux/spi/spidev.h> |
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#include "wiringPi.h" |
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#include "wiringPi.h" |
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#include "wiringPiSPI.h" |
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#include "wiringPiSPI.h" |
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@@ -45,10 +44,50 @@ |
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//static const char *spiDev1 = "/dev/spidev0.1" ; |
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//static const char *spiDev1 = "/dev/spidev0.1" ; |
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static const uint8_t spiBPW = 8 ; |
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static const uint8_t spiBPW = 8 ; |
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static const uint16_t spiDelay = 0 ; |
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static const uint16_t spiDelay = 0 ; |
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//https://datasheets.raspberrypi.com/cm4/cm4-datasheet.pdf |
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const uint8_t WPI_MaxSPINumbers = 7 ; |
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const uint8_t WPI_MaxSPIChannels = 3 ; |
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static uint32_t spiSpeeds [7][3] = |
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{ |
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{0, 0, 0}, |
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{0, 0, 0}, |
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{0, 0, 0}, |
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{0, 0, 0}, |
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{0, 0, 0}, |
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{0, 0, 0}, |
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{0, 0, 0}, |
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}; |
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static int spiFds [7][3] = |
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{ |
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{-1, -1, -1}, |
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{-1, -1, -1}, |
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{-1, -1, -1}, |
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{-1, -1, -1}, |
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{-1, -1, -1}, |
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{-1, -1, -1}, |
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{-1, -1, -1}, |
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}; |
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int SPICheckLimits(const int number, const int channel) { |
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if (channel<0 || channel>=WPI_MaxSPIChannels) { |
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fprintf (stderr, "wiringPiSPI: Invalid SPI channel (%d, valid range 0-%d)", channel, WPI_MaxSPIChannels-1); |
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return EINVAL; |
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} |
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if (number<0 || number>=WPI_MaxSPINumbers) { |
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fprintf (stderr, "wiringPiSPI: Invalid SPI number (%d, valid range 0-%d)", number, WPI_MaxSPINumbers-1); |
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return EINVAL; |
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} |
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return 0; //sucess |
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} |
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static uint32_t spiSpeeds [2] ; |
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static int spiFds [2] ; |
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#define RETURN_ON_LIMIT_FAIL int ret = SPICheckLimits(number, channel); if(ret!=0) { return ret; }; |
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/* |
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/* |
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* wiringPiSPIGetFd: |
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* wiringPiSPIGetFd: |
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@@ -56,9 +95,16 @@ static int spiFds [2] ; |
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********************************************************************************* |
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********************************************************************************* |
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*/ |
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*/ |
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int wiringPiSPIGetFd (int channel) |
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int wiringPiSPIxGetFd(const int number, int channel) |
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{ |
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{ |
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return spiFds [channel & 1] ; |
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if (SPICheckLimits(number, channel)!=0) { |
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return -1; |
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} |
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return spiFds[number][channel]; |
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} |
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int wiringPiSPIGetFd(int channel) { |
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return wiringPiSPIxGetFd(0, channel); |
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} |
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} |
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@@ -71,11 +117,11 @@ int wiringPiSPIGetFd (int channel) |
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********************************************************************************* |
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********************************************************************************* |
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*/ |
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*/ |
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int wiringPiSPIDataRW (int channel, unsigned char *data, int len) |
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int wiringPiSPIxDataRW (const int number, const int channel, unsigned char *data, const int len) |
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{ |
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{ |
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struct spi_ioc_transfer spi ; |
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struct spi_ioc_transfer spi ; |
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channel &= 1 ; |
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RETURN_ON_LIMIT_FAIL |
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// Mentioned in spidev.h but not used in the original kernel documentation |
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// Mentioned in spidev.h but not used in the original kernel documentation |
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// test program )-: |
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// test program )-: |
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@@ -86,12 +132,15 @@ int wiringPiSPIDataRW (int channel, unsigned char *data, int len) |
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spi.rx_buf = (unsigned long)data ; |
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spi.rx_buf = (unsigned long)data ; |
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spi.len = len ; |
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spi.len = len ; |
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spi.delay_usecs = spiDelay ; |
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spi.delay_usecs = spiDelay ; |
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spi.speed_hz = spiSpeeds [channel] ; |
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spi.speed_hz = spiSpeeds [number][channel] ; |
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spi.bits_per_word = spiBPW ; |
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spi.bits_per_word = spiBPW ; |
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return ioctl (spiFds [channel], SPI_IOC_MESSAGE(1), &spi) ; |
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return ioctl (spiFds[number][channel], SPI_IOC_MESSAGE(1), &spi) ; |
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} |
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} |
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int wiringPiSPIDataRW (int channel, unsigned char *data, int len) { |
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return wiringPiSPIxDataRW(0, channel, data, len); |
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} |
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/* |
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/* |
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* wiringPiSPISetupMode: |
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* wiringPiSPISetupMode: |
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@@ -99,46 +148,68 @@ int wiringPiSPIDataRW (int channel, unsigned char *data, int len) |
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********************************************************************************* |
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********************************************************************************* |
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*/ |
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*/ |
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int wiringPiSPISetupMode (int channel, int speed, int mode) |
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int wiringPiSPIxSetupMode(const int number, const int channel, const int speed, const int mode) |
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{ |
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{ |
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int fd ; |
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int fd ; |
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char spiDev [32] ; |
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char spiDev [32] ; |
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mode &= 3 ; // Mode is 0, 1, 2 or 3 |
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// Channel can be anything - lets hope for the best |
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// channel &= 1 ; // Channel is 0 or 1 |
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snprintf (spiDev, 31, "/dev/spidev0.%d", channel) ; |
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RETURN_ON_LIMIT_FAIL |
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if (mode<0 || mode>3) { // Mode is 0, 1, 2 or 3 original |
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fprintf (stderr, "wiringPiSPI: Invalid mode (%d, valid range 0-%d)", mode, 3); |
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return EINVAL; |
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} |
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if ((fd = open (spiDev, O_RDWR)) < 0) |
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return wiringPiFailure (WPI_ALMOST, "Unable to open SPI device: %s\n", strerror (errno)) ; |
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spiSpeeds [channel] = speed ; |
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spiFds [channel] = fd ; |
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snprintf (spiDev, 31, "/dev/spidev%d.%d", number, channel) ; |
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if ((fd = open (spiDev, O_RDWR)) < 0) { |
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return wiringPiFailure (WPI_ALMOST, "Unable to open SPI device %s: %s\n", spiDev, strerror (errno)) ; |
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} |
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spiSpeeds [number][channel] = speed ; |
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spiFds [number][channel] = fd ; |
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// Set SPI parameters. |
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// Set SPI parameters. |
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if (ioctl (fd, SPI_IOC_WR_MODE, &mode) < 0) |
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if (ioctl (fd, SPI_IOC_WR_MODE, &mode) < 0) |
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return wiringPiFailure (WPI_ALMOST, "SPI Mode Change failure: %s\n", strerror (errno)) ; |
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return wiringPiFailure (WPI_ALMOST, "SPI mode change failure: %s\n", strerror (errno)) ; |
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if (ioctl (fd, SPI_IOC_WR_BITS_PER_WORD, &spiBPW) < 0) |
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if (ioctl (fd, SPI_IOC_WR_BITS_PER_WORD, &spiBPW) < 0) |
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return wiringPiFailure (WPI_ALMOST, "SPI BPW Change failure: %s\n", strerror (errno)) ; |
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return wiringPiFailure (WPI_ALMOST, "SPI BPW change failure: %s\n", strerror (errno)) ; |
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if (ioctl (fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed) < 0) |
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if (ioctl (fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed) < 0) |
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return wiringPiFailure (WPI_ALMOST, "SPI Speed Change failure: %s\n", strerror (errno)) ; |
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return wiringPiFailure (WPI_ALMOST, "SPI speed change failure: %s\n", strerror (errno)) ; |
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return fd ; |
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return fd ; |
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} |
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} |
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int wiringPiSPISetupMode (int channel, int speed, int mode) { |
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return wiringPiSPIxSetupMode (0, channel, speed, mode); |
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} |
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/* |
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/* |
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* wiringPiSPISetup: |
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* wiringPiSPISetup: |
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* Open the SPI device, and set it up, etc. in the default MODE 0 |
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* Open the SPI device, and set it up, etc. in the default MODE 0 |
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********************************************************************************* |
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********************************************************************************* |
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*/ |
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*/ |
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int wiringPiSPISetup (int channel, int speed) |
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{ |
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return wiringPiSPISetupMode (channel, speed, 0) ; |
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int wiringPiSPISetup (int channel, int speed) { |
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return wiringPiSPIxSetupMode(0, channel, speed, 0) ; |
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} |
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int wiringPiSPIxClose (const int number, const int channel) { |
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RETURN_ON_LIMIT_FAIL |
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if (spiFds[number][channel]>0) { |
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ret = close(spiFds[number][channel]); |
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} |
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spiSpeeds [number][channel] = 0 ; |
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spiFds [number][channel] = -1 ; |
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return ret; |
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} |
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} |
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int wiringPiSPIClose (const int channel) { |
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return wiringPiSPIxClose (0, channel); |
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} |
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