ARMmbed
/
mbed-os
mirror of https://github.com/ARMmbed/mbed-os.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Merge pull request #3302 from bcostm/fix_issue_1685 

STM32F4 AnalogIn - Clear VBATE and TSVREFE bits before configuring ADC channels
pull/3322/head
Martin Kojtal 2016-11-29 18:21:14 +01:00 committed by GitHub
parent d4e23e1048 a3baf2d7bf
commit bd994b3f41
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
targets/TARGET_STM/TARGET_STM32F4/analogin_api.c
View File

@ -183,13 +183,19 @@ static inline uint16_t adc_read(analogin_t *obj)
return 0; 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_ConfigChannel(&AdcHandle, &sConfig);
HAL_ADC_Start(&AdcHandle); // Start conversion HAL_ADC_Start(&AdcHandle); // Start conversion
// Wait end of conversion and get value // Wait end of conversion and get value
if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) { if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
return (HAL_ADC_GetValue(&AdcHandle)); return (uint16_t)HAL_ADC_GetValue(&AdcHandle);
} else { } else {
return 0; return 0;
} }