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drivers: adc: STM32: fix support for internal voltage reference source

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Commit c045cbd336 added support for internal voltage reference source,
but in practice only the temp sensor is supported. Fix that.

Also change the code to keep the existing paths so that VREFINT and
TEMPSENSOR can be used at the same time.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2021-07-04 12:17:59 +02:00 • committed by Anas Nashif
commit 2a96cc0347
1 changed files with 9 additions and 7 deletions
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16
drivers/adc/adc_stm32.c
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@ -549,17 +549,18 @@ static int adc_stm32_check_acq_time(uint16_t acq_time)
}
/*
* Enable internal voltage reference source
* Enable internal channel source
*/
static void adc_stm32_set_common_path(const struct device *dev)
static void adc_stm32_set_common_path(const struct device *dev, uint32_t PathInternal)
{
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);
/* Do not remove existing paths */
PathInternal |= LL_ADC_GetCommonPathInternalCh(__LL_ADC_COMMON_INSTANCE(adc));
LL_ADC_SetCommonPathInternalCh(__LL_ADC_COMMON_INSTANCE(adc), PathInternal);
}
static void adc_stm32_setup_speed(const struct device *dev, uint8_t id,
@ -630,9 +631,10 @@ static int adc_stm32_channel_setup(const struct device *dev,
return -EINVAL;
}
if ((__LL_ADC_CHANNEL_TO_DECIMAL_NB(ADC_CHANNEL_TEMPSENSOR) == channel_cfg->channel_id) ||
(__LL_ADC_CHANNEL_TO_DECIMAL_NB(ADC_CHANNEL_VREFINT) == channel_cfg->channel_id)) {
adc_stm32_set_common_path(dev);
if (__LL_ADC_CHANNEL_TO_DECIMAL_NB(ADC_CHANNEL_TEMPSENSOR) == channel_cfg->channel_id) {
adc_stm32_set_common_path(dev, LL_ADC_PATH_INTERNAL_TEMPSENSOR);
} else if (__LL_ADC_CHANNEL_TO_DECIMAL_NB(ADC_CHANNEL_VREFINT) == channel_cfg->channel_id) {
adc_stm32_set_common_path(dev, LL_ADC_PATH_INTERNAL_VREFINT);
}
adc_stm32_setup_speed(dev, channel_cfg->channel_id,