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drivers: adc: STM32 Add common path

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Enable common path for internal voltage voltage
reference source.

Signed-off-by: Eug Krashtan <eug.krashtan@gmail.com>
This commit is contained in:
Eug Krashtan 2021-04-29 17:49:36 +03:00 • committed by Kumar Gala
commit c045cbd336
1 changed files with 28 additions and 0 deletions
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28
drivers/adc/adc_stm32.c
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@ -202,6 +202,11 @@ static const uint32_t table_samp_time[] = {
};
#endif
/* Bugfix for STM32G4 HAL */
#if !defined(ADC_CHANNEL_TEMPSENSOR)
#define ADC_CHANNEL_TEMPSENSOR ADC_CHANNEL_TEMPSENSOR_ADC1
#endif
/* External channels (maximum). */
#define STM32_CHANNEL_COUNT 20
@ -461,6 +466,10 @@ static int adc_stm32_read_async(const struct device *dev,
static int adc_stm32_check_acq_time(uint16_t acq_time)
{
if (acq_time == ADC_ACQ_TIME_MAX) {
return ARRAY_SIZE(acq_time_tbl) - 1;
}
for (int i = 0; i < 8; i++) {
if (acq_time == ADC_ACQ_TIME(ADC_ACQ_TIME_TICKS,
acq_time_tbl[i])) {
@ -476,6 +485,20 @@ static int adc_stm32_check_acq_time(uint16_t acq_time)
return -EINVAL;
}
/*
* Enable internal voltage reference source
*/
static void adc_stm32_set_common_path(const struct device *dev)
{
const struct adc_stm32_cfg *config =
(const struct adc_stm32_cfg *)dev->config;
ADC_TypeDef *adc = (ADC_TypeDef *)config->base;
(void) adc; /* Avoid 'unused variable' warning for some families */
LL_ADC_SetCommonPathInternalCh(__LL_ADC_COMMON_INSTANCE(adc),
LL_ADC_PATH_INTERNAL_TEMPSENSOR);
}
static void adc_stm32_setup_speed(const struct device *dev, uint8_t id,
uint8_t acq_time_index)
{
@ -544,6 +567,11 @@ static int adc_stm32_channel_setup(const struct device *dev,
return -EINVAL;
}
if (channel_cfg->channel_id == ADC_CHANNEL_TEMPSENSOR ||
channel_cfg->channel_id == ADC_CHANNEL_VREFINT) {
adc_stm32_set_common_path(dev);
}
adc_stm32_setup_speed(dev, channel_cfg->channel_id,
acq_time_index);