static int spi_stm32_configure(struct spi_config *config)
{
const struct spi_stm32_config *cfg = CONFIG_CFG(config);
struct spi_stm32_data *data = CONFIG_DATA(config);
const u32_t scaler[] = {
LL_SPI_BAUDRATEPRESCALER_DIV2,
LL_SPI_BAUDRATEPRESCALER_DIV4,
LL_SPI_BAUDRATEPRESCALER_DIV8,
LL_SPI_BAUDRATEPRESCALER_DIV16,
LL_SPI_BAUDRATEPRESCALER_DIV32,
LL_SPI_BAUDRATEPRESCALER_DIV64,
LL_SPI_BAUDRATEPRESCALER_DIV128,
LL_SPI_BAUDRATEPRESCALER_DIV256
};
SPI_TypeDef *spi = cfg->spi;
u32_t clock;
int br;
if (spi_context_configured(&data->ctx, config)) {
/* Nothing to do */
return 0;
}
if (SPI_WORD_SIZE_GET(config->operation) != 8) {
return -ENOTSUP;
}
clock_control_get_rate(device_get_binding(STM32_CLOCK_CONTROL_NAME),
(clock_control_subsys_t) &cfg->pclken, &clock);
for (br = 1 ; br <= ARRAY_SIZE(scaler) ; ++br) {
u32_t clk = clock >> br;
if (clk < config->frequency) {
break;
}
}
if (br > ARRAY_SIZE(scaler)) {
SYS_LOG_ERR("Unsupported frequency %uHz, max %uHz, min %uHz",
config->frequency,
clock >> 1,
clock >> ARRAY_SIZE(scaler));
return -EINVAL;
}
void initTempSensor(void)
{
unsigned char configData;
/*
** configures temperature sensor to 12bit resolution
** active low polarity of alert pin ,generate the 1 consecutive fault,
** compare mode of operation.
*/
configData = CONFIG_DATA(3, 0, 1, 0, 0,0);
/*
** Configure pointer register to select configuration
** register
*/
ptrReg = 1;
ConfigureTempSensor(configData, ptrReg);
}
