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kx122: Allow faster SPI bus frequency

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The hardcoded frequency of 10kHz was much slower than the capacity of the device

Signed-off-by: Antoine W. Campagna <AntoineW@Campagna.org>
Signed-off-by: Noel Eck <noel.eck@intel.com>
This commit is contained in:
Antoine W. Campagna
2018-03-25 22:02:02 -04:00
committed by Noel Eck
parent 83f541a5db
commit 54c6d294af
5 changed files with 16 additions and 7 deletions
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10
src/kx122/kx122.c
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@ -161,7 +161,7 @@ Sets acceleration scale of sensor and the buffer.
*/
static void kx122_map_grange(const kx122_context dev, KX122_RANGE_T grange);
kx122_context kx122_init(int bus, int addr, int chip_select_pin)
kx122_context kx122_init(int bus, int addr, int chip_select_pin, int spi_bus_frequency)
{
kx122_context dev = (kx122_context)malloc(sizeof(struct _kx122_context));
@ -190,6 +190,12 @@ kx122_context kx122_init(int bus, int addr, int chip_select_pin)
if(dev->using_spi){
if (spi_bus_frequency > 10000000){ // KX122 has a maximum SPI bus speed of 10MHz
printf("%s: bus frequency too high - KX122 has a maximum SPI bus speed of 10MHz.\n", __FUNCTION__);
kx122_close(dev);
return NULL;
}
if (!(dev->spi = mraa_spi_init(bus))){
printf("%s: mraa_spi_init() failed.\n", __FUNCTION__);
kx122_close(dev);
@ -205,7 +211,7 @@ kx122_context kx122_init(int bus, int addr, int chip_select_pin)
mraa_gpio_dir(dev->chip_select,MRAA_GPIO_OUT);
mraa_spi_mode(dev->spi,MRAA_SPI_MODE0);
if (mraa_spi_frequency(dev->spi,SPI_FREQUENCY)){
if (mraa_spi_frequency(dev->spi, spi_bus_frequency)){
printf("%s: mraa_spi_frequency() failed.\n", __FUNCTION__);
kx122_close(dev);
return NULL;