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drivers: adc: stm32: Disable ADC before calibration

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The STM32 docs state that the ADC may not be calibrated unless
the ADC is disabled (ADEN=0). This commit implements this constraint

Fixes #40936

Signed-off-by: Pete Dietl <petedietl@gmail.com>
This commit is contained in:
Pete Dietl 2021-12-13 09:58:28 +01:00 • committed by Maureen Helm
commit bc1b262885
1 changed files with 7 additions and 0 deletions
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7
drivers/adc/adc_stm32.c
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@ -592,7 +592,14 @@ static int start_read(const struct device *dev,
!defined(CONFIG_SOC_SERIES_STM32F1X) && \
!defined(STM32F3X_ADC_V2_5) && \
!defined(CONFIG_SOC_SERIES_STM32L1X)
/* we cannot calibrate the ADC while the ADC is enabled */
LL_ADC_Disable(adc);
while (LL_ADC_IsEnabled(adc) == 1UL) {
}
adc_stm32_calib(dev);
/* re-enable ADC after calibration */
LL_ADC_Enable(adc);
#else
LOG_ERR("Calibration not supported");
return -ENOTSUP;