Cannot use PA4 and PA5 with the DAC and ADC (PA6)

[Felipe_Nascimento]

Moved from this thread.

ADC usage configuration.

I have a project that already uses pins PA4 and PA5 with the DAC, but I cannot obtain a value when using pin PA6 to read a voltage level

[Felipe_Nascimento]

Could you give me a simple solution?

[SofLit]

What do you mean by simple solution?

[SofLit]

Need to explain what do you mean by "I cannot obtain a value when using pin PA6 to read a voltage level"?

Always 0? constant value? else?

Need to attach your project so others can help you efficiently.

[Felipe_Nascimento]

Always 0

I don't know if I'm configuring something wrong

[SofLit]

You need to share your code ..

[Felipe_Nascimento]

int main(void)

{

/* USER CODE BEGIN 1 */

/* USER CODE END 1 */



/* MCU Configuration--------------------------------------------------------*/



/* Reset of all peripherals, Initializes the Flash interface and the Systick. */

HAL_Init();



/* USER CODE BEGIN Init */



// uint8_t i = 0;



/* USER CODE END Init */



/* Configure the system clock */

SystemClock_Config();



/* USER CODE BEGIN SysInit */

DAC_Init();

DAC_Start();



/* USER CODE END SysInit */



/* Initialize all configured peripherals */

MX_GPIO_Init();

MX_DAC1_Init();

MX_I2C1_Init();

MX_USART2_UART_Init();

MX_TIM2_Init();

MX_ADC2_Init();



/* USER CODE BEGIN 2 */

ssd1306_Init();

ssd1306_Fill(Black);

ssd1306_UpdateScreen();

HAL_TIM_Base_Start_IT(&htim2);



/* USER CODE END 2 */



/* Infinite loop */

/* USER CODE BEGIN WHILE */



Menu_Select(select_position, select_mod);



while (1){



set_period = ((1.0 / frequency) * 1000000)/10;



uint32_t adc_value = readADC();

// float voltage_measured = (adc_value * 4.2) / 4095.0;



// if (voltage_measured <= 3.9) {

// status = 1;

// }

// else if (voltage_measured >= 3.9 && voltage_measured < 4.1) {

// status = 2;

// } else {

// status = 3;

// }

}
}


static void MX_DAC1_Init(void)

{



/* USER CODE BEGIN DAC1_Init 0 */



/* USER CODE END DAC1_Init 0 */



DAC_ChannelConfTypeDef sConfig = {0};



/* USER CODE BEGIN DAC1_Init 1 */



/* USER CODE END DAC1_Init 1 */



/** DAC Initialization

*/

hdac1.Instance = DAC1;

if (HAL_DAC_Init(&hdac1) != HAL_OK)

{

Error_Handler();

}



/** DAC channel OUT1 config

*/

sConfig.DAC_Trigger = DAC_TRIGGER_NONE;

sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;

if (HAL_DAC_ConfigChannel(&hdac1, &sConfig, DAC_CHANNEL_1) != HAL_OK)

{

Error_Handler();

}



/** DAC channel OUT2 config

*/

if (HAL_DAC_ConfigChannel(&hdac1, &sConfig, DAC_CHANNEL_2) != HAL_OK)

{

Error_Handler();

}

/* USER CODE BEGIN DAC1_Init 2 */



/* USER CODE END DAC1_Init 2 */



}


static void MX_ADC2_Init(void)

{



/* USER CODE BEGIN ADC2_Init 0 */



/* USER CODE END ADC2_Init 0 */



ADC_ChannelConfTypeDef sConfig = {0};



/* USER CODE BEGIN ADC2_Init 1 */



/* USER CODE END ADC2_Init 1 */



/** Common config

*/

hadc2.Instance = ADC2;

hadc2.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;

hadc2.Init.Resolution = ADC_RESOLUTION_12B;

hadc2.Init.ScanConvMode = ADC_SCAN_DISABLE;

hadc2.Init.ContinuousConvMode = DISABLE;

hadc2.Init.DiscontinuousConvMode = DISABLE;

hadc2.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;

hadc2.Init.ExternalTrigConv = ADC_SOFTWARE_START;

hadc2.Init.DataAlign = ADC_DATAALIGN_RIGHT;

hadc2.Init.NbrOfConversion = 1;

hadc2.Init.DMAContinuousRequests = ENABLE;

hadc2.Init.EOCSelection = ADC_EOC_SINGLE_CONV;

hadc2.Init.LowPowerAutoWait = DISABLE;

hadc2.Init.Overrun = ADC_OVR_DATA_PRESERVED;

if (HAL_ADC_Init(&hadc2) != HAL_OK)

{

Error_Handler();

}



/** Configure Regular Channel

*/

sConfig.Channel = ADC_CHANNEL_3; // PA6 = ADC2_IN3

sConfig.Rank = ADC_REGULAR_RANK_1;

sConfig.SamplingTime = ADC_SAMPLETIME_601CYCLES_5; // Tempo de amostragem rápido

if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK)

{

Error_Handler();

}

/* USER CODE BEGIN ADC2_Init 2 */



/* USER CODE END ADC2_Init 2 */



}





static void MX_GPIO_Init(void)

{

GPIO_InitTypeDef GPIO_InitStruct = {0};

/* USER CODE BEGIN MX_GPIO_Init_1 */

/* USER CODE END MX_GPIO_Init_1 */



/* GPIO Ports Clock Enable */

__HAL_RCC_GPIOF_CLK_ENABLE();

__HAL_RCC_GPIOC_CLK_ENABLE();

__HAL_RCC_GPIOA_CLK_ENABLE();

__HAL_RCC_GPIOB_CLK_ENABLE();



/*Configure GPIO pin Output Level */

HAL_GPIO_WritePin(GPIOA, BRIDGE_H_CH1_1_Pin|BRIDGE_H_CH1_2_Pin|BRIDGE_H_CH2_2_Pin|BRIDGE_H_CH2_1_Pin, GPIO_PIN_RESET);



/*Configure GPIO pins : BT_DOWN_CH2_Pin BT_UP_CH2_Pin */

GPIO_InitStruct.Pin = BT_DOWN_CH2_Pin|BT_UP_CH2_Pin;

GPIO_InitStruct.Mode = GPIO_MODE_INPUT;

GPIO_InitStruct.Pull = GPIO_PULLUP;

HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);



/*Configure GPIO pins : BRIDGE_H_CH1_1_Pin BRIDGE_H_CH1_2_Pin BRIDGE_H_CH2_2_Pin BRIDGE_H_CH2_1_Pin */

GPIO_InitStruct.Pin = BRIDGE_H_CH1_1_Pin|BRIDGE_H_CH1_2_Pin|BRIDGE_H_CH2_2_Pin|BRIDGE_H_CH2_1_Pin;

GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;

GPIO_InitStruct.Pull = GPIO_NOPULL;

GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;

HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);



/*Configure GPIO pins : BT_UP_SELECT_Pin BT_DOWN_SELECT_Pin BT_SELECT_Pin BT_START_STOP_Pin */

GPIO_InitStruct.Pin = BT_UP_SELECT_Pin|BT_DOWN_SELECT_Pin|BT_SELECT_Pin|BT_START_STOP_Pin;

GPIO_InitStruct.Mode = GPIO_MODE_INPUT;

GPIO_InitStruct.Pull = GPIO_PULLUP;

HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);



/*Configure GPIO pins : BT_UP_CH1_Pin BT_DOWN_CH1_Pin */

GPIO_InitStruct.Pin = BT_UP_CH1_Pin|BT_DOWN_CH1_Pin;

GPIO_InitStruct.Mode = GPIO_MODE_INPUT;

GPIO_InitStruct.Pull = GPIO_PULLUP;

HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);





/* USER CODE BEGIN MX_GPIO_Init_2 */

/* USER CODE END MX_GPIO_Init_2 */

}

[Felipe_Nascimento]

uint32_t readADC(void) {
uint32_t adcValue = 0;
HAL_ADC_Start(&hadc2); // Inicia a conversão
// if (HAL_ADC_PollForConversion(&hadc2, 10) == HAL_OK) {
// adcValue = HAL_ADC_GetValue(&hadc2); // Obtém o valor convertido
// }
adcValue = HAL_ADC_GetValue(&hadc2); // Obtém o valor convertido

HAL_ADC_Stop(&hadc2); // Para o ADC após a leitura
return adcValue;
}

[SofLit]

---

@Felipe_Nascimento wrote:

uint32_t readADC(void) {
uint32_t adcValue = 0;
HAL_ADC_Start(&hadc2); // Inicia a conversão
// if (HAL_ADC_PollForConversion(&hadc2, 10) == HAL_OK) {
// adcValue = HAL_ADC_GetValue(&hadc2); // Obtém o valor convertido
// }
adcValue = HAL_ADC_GetValue(&hadc2); // Obtém o valor convertido

HAL_ADC_Stop(&hadc2); // Para o ADC após a leitura
return adcValue;
}

---

You need also to provide the ADC configuration as well as the DAC + their GPIO configs

Meanwhile, you need to poll on the end of the conversion + you need to calibrate the ADC before to start. From the HAL example:

 if (HAL_ADCEx_Calibration_Start(&AdcHandle_slave, ADC_SINGLE_ENDED) != HAL_OK)

PS: please use </> button to paste your code. See this link.