I am trying to set up my NUCLEO-G474RE board to perform ADC regular scanning mode using DMA with 4 channels and also discontinuous injection with 2 channels as shown below.
I’ve use STM32CUBEMX to set up my NUCLEO-G474RE board as follows.
- ADC Configuration
- IN1/2/5/6/7/8 set to “Single Ended�?
- “DMA Settings�? Tab
- Add DMA Request, Mode = “Circular�?
- “NVIC Settings�? Tab
- Enable “DMA1 channel global interrupt�?
- Enable “ADC1 and ADC2 global interrupt�?
- “Parameter Settings�? Tab
- “ADC_Settings�?
- “Continuous Conversion Mode = Enable
- “DMA Continuous Requests�? = Enable
- “ADC_Regular_ConversionMode�?
- “Number of Conversions�? = 4
- Rank 1, Channel = Channel 5, Sampling Time = 640.5 Cycles
- Rank 2, Channel = Channel 6, Sampling Time = 640.5 Cycles
- Rank 3, Channel = Channel 7, Sampling Time = 640.5 Cycles
- Rank 4, Channel = Channel 8, Sampling Time = 640.5 Cycles
- ADC_Injection_ConversionMode
- Enable Inject Conversions = “Enable�?
- “Number of Conversions�? = 2
- “External Trigger Conversion Source�? = Timer 2 Capture Compare 1 event�?
- “Injected Conversion Mode�? = “Discontinuous Mode�?
- Rank 1, Channel = Channel 1
- Rank 2, Channel = Channel 2
- TIM2
- “Clock Source�? = Internal Clock
- Channel1 = “PWM Generation No Output�?
- “Parameter Settings�? Tab
- “Counter Period�? = 170000000 (1second @ 170MHz)
- “PWM Generation Channel 1�?
- “Pulse�? = 100000000
- “ADC_Settings�?
I then hit the “GENERATE CODED�? button and make the following code changes to main.c
/* USER CODE BEGIN 0 */
volatile int16_t ADCxConvertedDataAdc[4];
/* USER CODE END 0 */
:
:
/* USER CODE BEGIN 2 */
HAL_ADCEx_Calibration_Start(&hadc1, ADC_SINGLE_ENDED);
HAL_ADCEx_InjectedStart_IT(&hadc1);
HAL_ADC_Start_DMA(&hadc1, (uint32_t*)ADCxConvertedDataAdc, 4);
HAL_TIM_PWM_Start_IT(&htim2, TIM_CHANNEL_1);
/* USER CODE END 2 *If I comment out “HAL_ADC_Start_DMA�? I can see my inject channels sampling random values every second as configured from TIM2.
But when I run with “HAL_ADC_Start_DMA�? I can see the 4 random values being continuous being sampled, but now my injected values only report zero, or sometimes ones.
Hopefully I'm just doping something stupid in my code to initialise the ADC and it's not a bug in the ADC module.
cheers
Chris
