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arch/stm32f0l0g0/stm32_adc.c: fix ADC calibration

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Fix and enable ADC calibration. The ADC voltage regulator must be
enabled and regulator start-up time must be respected.

tested on nucleo-c071rb and b-l072z-lrwan1

Signed-off-by: raiden00pl <raiden00@railab.me>
This commit is contained in:
raiden00pl 2025-04-04 14:37:37 +02:00 • committed by Xiang Xiao
parent d5db7d1cee
commit 23ef48e673
1 changed files with 12 additions and 8 deletions
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20
arch/arm/src/stm32f0l0g0/stm32_adc.c
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@ -1029,18 +1029,16 @@ static void adc_watchdog_cfg(struct stm32_dev_s *priv)
static void adc_calibrate(struct stm32_dev_s *priv)
{
#if 0 /* Doesn't work */
/* Calibrate the ADC */
/* Calibrate the ADC.
* 1. ADC must be disabled
* 2. the voltage regulater must be enabled
*/
adc_modifyreg(priv, STM32_ADC_CR_OFFSET, ADC_CR_ADCALDIF, AD_CR_ADCAL);
adc_modifyreg(priv, STM32_ADC_CR_OFFSET, 0, ADC_CR_ADCAL);
/* Wait for the calibration to complete */
while ((adc_getreg(priv, STM32_ADC_CR_OFFSET) & ADC_CR_ADCAL) != 0);
#else
UNUSED(priv);
#endif
}
/****************************************************************************
@ -1072,7 +1070,13 @@ static void adc_mode_cfg(struct stm32_dev_s *priv)
static void adc_voltreg_cfg(struct stm32_dev_s *priv)
{
UNUSED(priv);
/* Enable voltage regulator - required by ADC calibration */
adc_putreg(priv, STM32_ADC_CR_OFFSET, ADC_CR_ADVREGEN);
/* Wait for ADC voltage regulator start-up */
up_udelay(50);
}
/****************************************************************************