Armadilloフォーラム

#define SPI_DEVICE_PATH			"/dev/spidev1.0"
 
int main(int argc, char *argv[])
{
	int fd;
	fd = spi_open(SPI_DEVICE_PATH);
 
	if (fd < 0) {
		/*  エラーログ出力 */
	}
}
 
int spi_open(const char *dev_path)
{
	int fd;
	uint8_t mode = AD01_SPI_MODE;
	int error;
	int rc;
 
	/* check device path */
	if (dev_path == NULL) {
		errno = EINVAL;
		return -1;
	}
 
	/* SPI device open */
	fd = open(dev_path, O_RDWR, S_IRWXO);
	if(fd < 0) {
		error = errno;
		goto err1;
	}
 
	/* Set SPI mode for write */
	rc = ioctl(fd, SPI_IOC_WR_MODE, &mode);
	if (rc < 0) {
		error = errno;
		goto err2;
	}
 
	/* Set SPI mode for read*/
	rc = ioctl(fd, SPI_IOC_RD_MODE, &mode);
	if (rc < 0) {
		error = errno;
		goto err2;
	}
 
	return fd;
 
err2:
	close(fd);
 
err1:
	errno = error;
 
	return -1;
}