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spi.hpp: Add C++ wrapper around Spi

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* maa_spi_context becomes an opaque pointer
* C++ wrapper class Spi created
* swig now uses C++ wrapper Gpio to generate API

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Brendan Le Foll
2014-05-16 14:10:29 +01:00
parent 41f619048d
commit d0240cd50a
6 changed files with 94 additions and 61 deletions
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35
src/spi/spi.c
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@@ -34,7 +34,16 @@
#define MAX_SIZE 64
#define SPI_MAX_LENGTH 4096
maa_spi_context*
/**
* A strucutre representing the SPI device
*/
struct _spi {
/*@{*/
int devfd; /**< File descriptor to SPI Device */
/*@}*/
};
maa_spi_context
maa_spi_init()
{
double bus = maa_check_spi();
@@ -42,14 +51,14 @@ maa_spi_init()
fprintf(stderr, "Failed. SPI platform Error\n");
return NULL;
}
maa_spi_context* dev = (maa_spi_context*) malloc(sizeof(maa_spi_context));
maa_spi_context dev = (maa_spi_context) malloc(sizeof(struct _spi));
memset(dev, 0, sizeof(maa_spi_context));
char path[MAX_SIZE];
sprintf(path, "/dev/spidev%.1f", bus);
dev->spifd = open(path, O_RDWR);
if (dev->spifd < 0) {
dev->devfd = open(path, O_RDWR);
if (dev->devfd < 0) {
fprintf(stderr, "Failed opening SPI Device. bus:%s\n", path);
free(dev);
return NULL;
@@ -59,19 +68,19 @@ maa_spi_init()
}
maa_result_t
maa_spi_mode(maa_spi_context* spi, unsigned short mode)
maa_spi_mode(maa_spi_context dev, unsigned short mode)
{
return MAA_ERROR_FEATURE_NOT_IMPLEMENTED;
}
maa_result_t
maa_spi_frequency(maa_spi_context* spi, int hz)
maa_spi_frequency(maa_spi_context dev, int hz)
{
return MAA_ERROR_FEATURE_NOT_IMPLEMENTED;
}
uint8_t
maa_spi_write(maa_spi_context* spi, uint8_t data)
maa_spi_write(maa_spi_context dev, uint8_t data)
{
struct spi_ioc_transfer msg;
memset(&msg, 0, sizeof(msg));
@@ -85,15 +94,15 @@ maa_spi_write(maa_spi_context* spi, uint8_t data)
msg.bits_per_word = 8;
msg.delay_usecs = 0;
msg.len = length;
if(ioctl(spi->spifd, SPI_IOC_MESSAGE(1), &msg) < 0) {
fprintf(stderr, "Failed to perform spi transfer\n");
if (ioctl(dev->devfd, SPI_IOC_MESSAGE(1), &msg) < 0) {
fprintf(stderr, "Failed to perform dev transfer\n");
return -1;
}
return recv;
}
uint8_t*
maa_spi_write_buf(maa_spi_context* spi, uint8_t* data, int length)
maa_spi_write_buf(maa_spi_context dev, uint8_t* data, int length)
{
struct spi_ioc_transfer msg;
memset(&msg, 0, sizeof(msg));
@@ -106,15 +115,15 @@ maa_spi_write_buf(maa_spi_context* spi, uint8_t* data, int length)
msg.bits_per_word = 8;
msg.delay_usecs = 0;
msg.len = length;
if(ioctl(spi->spifd, SPI_IOC_MESSAGE(1), &msg) < 0) {
fprintf(stderr, "Failed to perform spi transfer\n");
if (ioctl(dev->devfd, SPI_IOC_MESSAGE(1), &msg) < 0) {
fprintf(stderr, "Failed to perform dev transfer\n");
return NULL;
}
return recv;
}
maa_result_t
maa_spi_stop(maa_spi_context* spi)
maa_spi_stop(maa_spi_context dev)
{
return MAA_ERROR_FEATURE_NOT_IMPLEMENTED;
}