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spi.c: introduced a _replace hook for spi_lsbmode()

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This could be generally useful and more specifically is a
prerequisite for issue #178.

Signed-off-by: Alex Tereschenko <alext.mkrs@gmail.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Alex Tereschenko
2015-06-14 16:42:52 +02:00
committed by Brendan Le Foll
parent 44047e746f
commit 5adc951f57
2 changed files with 5 additions and 0 deletions
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1
include/mraa_adv_func.h
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@@ -61,6 +61,7 @@ typedef struct {
mraa_result_t (*spi_init_pre) (int bus);
mraa_result_t (*spi_init_post) (mraa_spi_context spi);
mraa_result_t (*spi_lsbmode_replace) (mraa_spi_context dev, mraa_boolean_t lsb);
mraa_result_t (*uart_init_pre) (int index);
mraa_result_t (*uart_init_post) (mraa_uart_context uart);

4
src/spi/spi.c
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@@ -196,6 +196,10 @@ mraa_spi_frequency(mraa_spi_context dev, int hz)
mraa_result_t
mraa_spi_lsbmode(mraa_spi_context dev, mraa_boolean_t lsb)
{
if (advance_func->spi_lsbmode_replace != NULL) {
return advance_func->spi_lsbmode_replace(dev, lsb);
}
uint8_t lsb_mode = (uint8_t) lsb;
if (ioctl(dev->devfd, SPI_IOC_WR_LSB_FIRST, &lsb_mode) < 0) {
syslog(LOG_ERR, "spi: Failed to set bit order");