This is an automated email from the ASF dual-hosted git repository.
xiaoxiang pushed a commit to branch releases/12.9
in repository https://gitbox.apache.org/repos/asf/nuttx.git
The following commit(s) were added to refs/heads/releases/12.9 by this push:
new df37552a82 arch/stm32f0l0g0/stm32_adc.c: fix ADC calibration
df37552a82 is described below
commit df37552a828b5c2a82b38dc09e1c40b43016e5f7
Author: raiden00pl <[email protected]>
AuthorDate: Fri Apr 4 14:37:37 2025 +0200
arch/stm32f0l0g0/stm32_adc.c: fix ADC calibration
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 <[email protected]>
---
arch/arm/src/stm32f0l0g0/stm32_adc.c | 20 ++++++++++++--------
1 file changed, 12 insertions(+), 8 deletions(-)
diff --git a/arch/arm/src/stm32f0l0g0/stm32_adc.c
b/arch/arm/src/stm32f0l0g0/stm32_adc.c
index 891c7a2c49..7ef424ba01 100644
--- a/arch/arm/src/stm32f0l0g0/stm32_adc.c
+++ b/arch/arm/src/stm32f0l0g0/stm32_adc.c
@@ -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);
}
/****************************************************************************
