Question
STM32F303C6T6 ADC DUAL REGULAR MODE
Hello,
I am experiencing a problem with ADC1 and ADC2. I configured them in Dual Regular Simultaneous Mode, where ADC1 acts as the master and ADC2 acts as the slave.
The ADC channel connections are as follows:
-
ADC1 Channel 1: 24V_Sense
-
ADC1 Channel 2: 5V_Sense
-
ADC2 Channel 14: IOut_Sense
-
ADC2 Channel Vrefint: Internal reference voltage
However, I noticed that IOut_Sense always has a value, while 24V_Sense is unstable and fluctuating.
OUTPUT:
V24:24011 mV | V5:3 mV | I:23653 mA
V24:8807 mV | V5:3 mV | I:8675 mA
V24:8726 mV | V5:1 mV | I:8675 mA
V24:8844 mV | V5:3 mV | I:8675 mA
V24:23767 mV | V5:1 mV | I:23528 mA
V24:23853 mV | V5:0 mV | I:23590 mA
V24:23727 mV | V5:0 mV | I:23435 mA
V24:23968 mV | V5:0 mV | I:23481 mA
V24:8832 mV | V5:3 mV | I:8675 mA
V24:23541 mV | V5:0 mV | I:23388 mA
uint32_t adc_dual_buffer[4];
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_ADC1_Init();
MX_ADC2_Init();
MX_USART1_UART_Init();
MX_I2C1_Init();
MX_DMA_Init();
/* USER CODE BEGIN 2 */
HAL_UART_Receive_IT(&huart1, &rxByte, 1);
HAL_ADCEx_Calibration_Start(&hadc1, ADC_SINGLE_ENDED);
HAL_ADCEx_Calibration_Start(&hadc2, ADC_SINGLE_ENDED);
// 2️⃣ Start slave ADC first
HAL_ADC_Start(&hadc2);
// 3️⃣ Start dual mode DMA from master
HAL_ADCEx_MultiModeStart_DMA(&hadc1,
(uint32_t*)adc_dual_buffer,
4);
while (1)
{
Read_ADC_Values();
}
}
ADC configuration:
void MX_ADC1_Init(void)
{
ADC_ChannelConfTypeDef sConfig = {0};
ADC_MultiModeTypeDef multimode = {0};
__HAL_RCC_ADC12_CLK_ENABLE();
hadc1.Instance = ADC1;
hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE;
hadc1.Init.ContinuousConvMode = ENABLE;
hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc1.Init.NbrOfConversion = 2;
hadc1.Init.DMAContinuousRequests = ENABLE;
HAL_ADC_Init(&hadc1);
// Rank 1 - Vout24V
sConfig.Channel = ADC_CHANNEL_1; // change to your real pin
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_601CYCLES_5;
HAL_ADC_ConfigChannel(&hadc1, &sConfig);
// Rank 2 - Vout5V
sConfig.Channel = ADC_CHANNEL_2; // change to your real pin
sConfig.Rank = ADC_REGULAR_RANK_2;
sConfig.SamplingTime = ADC_SAMPLETIME_601CYCLES_5;
HAL_ADC_ConfigChannel(&hadc1, &sConfig);
// MULTIMODE CONFIG
multimode.Mode = ADC_DUALMODE_REGSIMULT;
multimode.DMAAccessMode = ADC_DMAACCESSMODE_12_10_BITS;
multimode.TwoSamplingDelay = ADC_TWOSAMPLINGDELAY_5CYCLES;
HAL_ADCEx_MultiModeConfigChannel(&hadc1, &multimode);
}
void MX_ADC2_Init(void)
{
ADC_ChannelConfTypeDef sConfig = {0};
__HAL_RCC_SYSCFG_CLK_ENABLE();
hadc2.Instance = ADC2;
hadc2.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
hadc2.Init.Resolution = ADC_RESOLUTION_12B;
hadc2.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc2.Init.ScanConvMode = ADC_SCAN_ENABLE;
hadc2.Init.ContinuousConvMode = ENABLE;
hadc2.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc2.Init.NbrOfConversion = 2;
HAL_ADC_Init(&hadc2);
// Rank 1 - Iout (CH14)
sConfig.Channel = ADC_CHANNEL_14;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_601CYCLES_5;
HAL_ADC_ConfigChannel(&hadc2, &sConfig);
// Rank 2 - Vrefint
sConfig.Channel = ADC_CHANNEL_VREFINT;
sConfig.Rank = ADC_REGULAR_RANK_2;
sConfig.SamplingTime = ADC_SAMPLETIME_601CYCLES_5; // VERY IMPORTANT
HAL_ADC_ConfigChannel(&hadc2, &sConfig);
}
static void MX_DMA_Init(void)
{
__HAL_RCC_DMA1_CLK_ENABLE();
hdma_adc1.Instance = DMA1_Channel1;
hdma_adc1.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_adc1.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_adc1.Init.MemInc = DMA_MINC_ENABLE;
hdma_adc1.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_adc1.Init.Mode = DMA_CIRCULAR;
hdma_adc1.Init.Priority = DMA_PRIORITY_HIGH;
if (HAL_DMA_Init(&hdma_adc1) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA(&hadc1, DMA_Handle, hdma_adc1);
}