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drivers: adc: stm32: reset acquisition time between reads

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For all STM32 ADC that use common sampling times, there is a check made to
ensure that all channels of a sequence use the same sampling time.
The value was not reset between reads, resulting in error if two
consecutive sequences used different values.
This commit adds a reset of this value once read is done.

Signed-off-by: Guillaume Gautier <guillaume.gautier-ext@st.com>
This commit is contained in:
Guillaume Gautier 2023-09-25 16:51:30 +02:00 • committed by Carles Cufí
commit e8e5d5554c
1 changed files with 6 additions and 0 deletions
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6
drivers/adc/adc_stm32.c
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@ -990,6 +990,11 @@ static void adc_context_on_complete(struct adc_context *ctx, int status)
ARG_UNUSED(status);
adc_stm32_disable(adc);
/* Reset acquisition time used for the sequence */
data->acq_time_index = -1;
/* Reset internal channels */
LL_ADC_SetCommonPathInternalCh(__LL_ADC_COMMON_INSTANCE(adc),
LL_ADC_PATH_INTERNAL_NONE);
@ -1119,6 +1124,7 @@ static int adc_stm32_channel_setup(const struct device *dev,
* identical acquisition time.
*/
if (acq_time_index != data->acq_time_index) {
LOG_ERR("Multiple sampling times not supported");
return -EINVAL;
}
}