Vbat of STM32G0 is not working Always it is giving fixed value . Is it usable as adc ???

[TDK]

Yes, VBAT can be measured from the ADC.

What value are you getting and what value do you expect? How are things configured?

[SDwiv.1]

static void MX_ADC1_Init(void)

{

 /* USER CODE BEGIN ADC1_Init 0 */

 /* USER CODE END ADC1_Init 0 */

 ADC_ChannelConfTypeDef sConfig = {0};

 /* USER CODE BEGIN ADC1_Init 1 */

 /* USER CODE END ADC1_Init 1 */

 /** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)

 */

 hadc1.Instance = ADC1;

 hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;

 hadc1.Init.Resolution = ADC_RESOLUTION_12B;

 hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;

 hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE;

 hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;

 hadc1.Init.LowPowerAutoWait = DISABLE;

 hadc1.Init.LowPowerAutoPowerOff = DISABLE;

 hadc1.Init.ContinuousConvMode = DISABLE;

 hadc1.Init.NbrOfConversion = 4;

 hadc1.Init.DiscontinuousConvMode = ENABLE;

 hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;

 hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;

 hadc1.Init.DMAContinuousRequests = DISABLE;

 hadc1.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;

 hadc1.Init.SamplingTimeCommon1 = ADC_SAMPLETIME_12CYCLES_5;

 hadc1.Init.SamplingTimeCommon2 = ADC_SAMPLETIME_160CYCLES_5;

 hadc1.Init.OversamplingMode = DISABLE;

 hadc1.Init.TriggerFrequencyMode = ADC_TRIGGER_FREQ_HIGH;

 if (HAL_ADC_Init(&hadc1) != HAL_OK)

 {

  Error_Handler();

 }

 /** Configure Regular Channel

 */

 sConfig.Channel = ADC_CHANNEL_4;

 sConfig.Rank = ADC_REGULAR_RANK_4;

 sConfig.SamplingTime = ADC_SAMPLINGTIME_COMMON_2;

 if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)

 {

  Error_Handler();

 }

 /** Configure Regular Channel

 */

 sConfig.Channel = ADC_CHANNEL_VREFINT;

 sConfig.Rank = ADC_REGULAR_RANK_2;

 if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)

 {

  Error_Handler();

 }

 /** Configure Regular Channel

 */

 sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;

 sConfig.Rank = ADC_REGULAR_RANK_3;

 if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)

 {

  Error_Handler();

 }

 /** Configure Regular Channel

 */

 sConfig.Channel = ADC_CHANNEL_VBAT;

 sConfig.Rank = ADC_REGULAR_RANK_1;

 if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)

 {

  Error_Handler();

 }

 /* USER CODE BEGIN ADC1_Init 2 */

 /* USER CODE END ADC1_Init 2 */

}

[SDwiv.1]

Getting value 1380

[SDwiv.1]

Getting value always 1380

[TDK]

Why did you post the MX_ADC1_Init code 4 times?

What's wrong with the value 1380? Seems reasonable for a VBAT/3 measurement to me. Do the values of the other channels change?

[Tesla DeLorean]

And WHAT voltage do you measure there with a meter?

Have you tested with multiple different levels?

Explain your test methodology so we have some clue as to what you're doing.

[SDwiv.1]

When i am giving other voltage or o volt ,there is no count is changing ,always it is giving around 1380

[SDwiv.1]

For other channel is working fine

[SDwiv.1]

using dma to start adc