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STM32F4 AnalogIn - Clear VBATE and TSVREFE bits before configuring ADC channels #3302

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Merged
merged 2 commits into from
Nov 29, 2016
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STM32F4 AnalogIn - Clear VBATE and TSVREFE bits before configuring ADC channels #3302

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STM32F4 - Clear VBATE and TSVREFE bits before configuring ADC channels
bcostm Nov 21, 2016
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bcostm Nov 22, 2016
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8 changes: 7 additions & 1 deletion targets/TARGET_STM/TARGET_STM32F4/analogin_api.c
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Original file line number Diff line number Diff line change
Expand Up @@ -183,13 +183,19 @@ static inline uint16_t adc_read(analogin_t *obj)
return 0;
}

// Measuring VBAT sets the ADC_CCR_VBATE bit in ADC->CCR, and there is not
// possibility with the ST HAL driver to clear it. If it isn't cleared,
// VBAT remains connected to the ADC channel in preference to temperature,
// so VBAT readings are returned in place of temperature.
ADC->CCR &= ~(ADC_CCR_VBATE | ADC_CCR_TSVREFE);

HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);

HAL_ADC_Start(&AdcHandle); // Start conversion

// Wait end of conversion and get value
if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
return (HAL_ADC_GetValue(&AdcHandle));
return (uint16_t)HAL_ADC_GetValue(&AdcHandle);
} else {
return 0;
}
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