Posted on August 30, 2017 at 15:46Hello Community,
I work on a STM32L151CCU6 and I need your help.
I try to measure VDDA voltage in order to calculate a voltage divider on PA2 (single mode). My two ADC configuration functions are :
void MX_ADC_Init(void)
{
GPIO_InitTypeDef gpioInit1;
GPIO_InitTypeDef gpioInit2;
gpioInit1.Pin = PID_PIN; //PA2
gpioInit1.Mode = GPIO_MODE_ANALOG;
gpioInit1.Pull = GPIO_NOPULL;
HAL_GPIO_Init(PID_PORT, &gpioInit1); PA2
gpioInit2.Pin = PID_POWER_SUPPLY_PIN; //PB2
gpioInit2.Mode = GPIO_MODE_OUTPUT_PP;
gpioInit2.Pull = GPIO_NOPULL;
HAL_GPIO_Init(PID_POWER_SUPPLY_PORT, &gpioInit2); //PB2
__HAL_RCC_ADC1_CLK_ENABLE();
ADC_ChannelConfTypeDef sConfig;
/**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
*/
adc_identification.Instance = ADC1;
adc_identification.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV2;
adc_identification.Init.Resolution = ADC_RESOLUTION_12B;
adc_identification.Init.DataAlign = ADC_DATAALIGN_RIGHT;
adc_identification.Init.ScanConvMode = ADC_SCAN_DISABLE;
adc_identification.Init.EOCSelection = ADC_EOC_SEQ_CONV;
adc_identification.Init.LowPowerAutoWait = ADC_AUTOWAIT_DISABLE;
adc_identification.Init.LowPowerAutoPowerOff = ADC_AUTOPOWEROFF_DISABLE;
adc_identification.Init.ChannelsBank = ADC_CHANNELS_BANK_A;
adc_identification.Init.ContinuousConvMode = DISABLE;
adc_identification.Init.NbrOfConversion = 1;
adc_identification.Init.DiscontinuousConvMode = DISABLE;
adc_identification.Init.ExternalTrigConv = ADC_SOFTWARE_START;
adc_identification.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
adc_identification.Init.DMAContinuousRequests = DISABLE;
if (HAL_ADC_Init(&adc_identification) != HAL_OK)
{
while(1);
}
/**Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
*/
sConfig.Channel = ADC_CHANNEL_2;
sConfig.Rank = 1;
sConfig.SamplingTime = ADC_SAMPLETIME_384CYCLES;
if (HAL_ADC_ConfigChannel(&adc_identification, &sConfig) != HAL_OK)
{
while(1);
}
ADC_Enable(&adc_identification);
}
and :
void MX_ADC_VDD_Init(void)
{
ADC_ChannelConfTypeDef sConfig;
/**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)*/
VDD_measurement.Instance = ADC1;
VDD_measurement.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
VDD_measurement.Init.Resolution = ADC_RESOLUTION_12B;
VDD_measurement.Init.DataAlign = ADC_DATAALIGN_RIGHT;
VDD_measurement.Init.ScanConvMode = ADC_SCAN_DISABLE;
VDD_measurement.Init.EOCSelection = ADC_EOC_SEQ_CONV;
VDD_measurement.Init.LowPowerAutoWait = ADC_AUTOWAIT_DISABLE;
VDD_measurement.Init.LowPowerAutoPowerOff = ADC_AUTOPOWEROFF_DISABLE;
VDD_measurement.Init.ChannelsBank = ADC_CHANNELS_BANK_A;
VDD_measurement.Init.ContinuousConvMode = DISABLE;
VDD_measurement.Init.NbrOfConversion = 1;
VDD_measurement.Init.DiscontinuousConvMode = DISABLE;
VDD_measurement.Init.ExternalTrigConv = ADC_SOFTWARE_START;
VDD_measurement.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
VDD_measurement.Init.DMAContinuousRequests = DISABLE;
if (HAL_ADC_Init(&VDD_measurement) != HAL_OK)
{
while(1);
}
/**Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
*/
sConfig.Channel = ADC_CHANNEL_17;
sConfig.Rank = 1;
sConfig.SamplingTime = ADC_SAMPLETIME_4CYCLES;
if (HAL_ADC_ConfigChannel(&VDD_measurement, &sConfig) != HAL_OK)
{
while(1);
}
ADC_Enable(&VDD_measurement);
}
When I try to measure this two ADC channel, I find 0.
I use this function : HAL_ADC_GetValue(&VDD_measurement);
Does anyone know where is my problem?
Thanks,
Jérémy
