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spi: added spi mode to mraa

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Signed-off-by: Kiveisha Yevgeniy <yevgeniy.kiveisha@intel.com>
This commit is contained in:
Kiveisha Yevgeniy
2014-08-06 11:40:51 +00:00
parent 551e553894
commit 998095d802
3 changed files with 38 additions and 4 deletions
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12
api/mraa/spi.h
View File

@@ -43,6 +43,16 @@ extern "C" {
#include "common.h"
/**
* MRAA supported platform types
*/
typedef enum {
MODE0 = 0, /**< CPOL = 0, CPHA = 0, Clock idle low, data is clocked in on rising edge, output data (change) on falling edge */
MODE1 = 1, /**< CPOL = 0, CPHA = 1, Clock idle low, data is clocked in on falling edge, output data (change) on rising edge */
MODE2 = 2, /**< CPOL = 1, CPHA = 0, Clock idle low, data is clocked in on falling edge, output data (change) on rising edge */
MODE3 = 3, /**< CPOL = 1, CPHA = 1, Clock idle low, data is clocked in on rising, edge output data (change) on falling edge */
} mraa_spi_mode_t;
/**
* Opaque pointer definition to the internal struct _spi
*/
@@ -63,7 +73,7 @@ mraa_spi_context mraa_spi_init(int bus);
* @param mode The SPI mode, See Linux spidev
* @return Spi context or NULL
*/
mraa_result_t mraa_spi_mode(mraa_spi_context dev,unsigned short mode);
mraa_result_t mraa_spi_mode(mraa_spi_context dev, mraa_spi_mode_t mode);
/** Set the SPI device operating clock frequency.
*

2
api/mraa/spi.hpp
View File

@@ -57,7 +57,7 @@ class Spi {
* @param mode the mode. See Linux spidev doc
* @return Result of operation
*/
mraa_result_t mode(unsigned short mode) {
mraa_result_t mode(mraa_spi_mode_t mode) {
return mraa_spi_mode(m_spi, mode);
}
/**

28
src/spi/spi.c
View File

@@ -78,9 +78,33 @@ mraa_spi_init(int bus)
}
mraa_result_t
mraa_spi_mode(mraa_spi_context dev, unsigned short mode)
mraa_spi_mode(mraa_spi_context dev, mraa_spi_mode_t mode)
{
dev->mode = mode;
uint8_t spi_mode = 0;
switch (mode) {
case MODE0:
spi_mode = SPI_MODE_0;
break;
case MODE1:
spi_mode = SPI_MODE_1;
break;
case MODE2:
spi_mode = SPI_MODE_2;
break;
case MODE3:
spi_mode = SPI_MODE_3;
break;
default:
spi_mode = SPI_MODE_0;
break;
}
if (ioctl (dev->devfd, SPI_IOC_WR_MODE, &spi_mode) < 0) {
fprintf(stderr, "Failed to set spi mode\n");
return MRAA_ERROR_INVALID_RESOURCE;
}
dev->mode = spi_mode;
return MRAA_SUCCESS;
}