STM32F2 ADC: No regular channels, 2 Injected channels, with DMA. Is this configuration right?

[chris12892]

Posted on August 16, 2016 at 18:09

Hi,

I have the attached code. This is supposed to set up the ADC for 2 injected channels, 0 regular channels and DMA. Additionally, this is supposed to use TIM1_CH4 to trigger the conversion start of the injected channels I'm wondering this configuration is correct, mainly because there is a note in the definition for ADC_InitTypeDef for NbrOfConversion specifying that the minimum value is 1, though the ADC_InitTypeDef is a required parameter to configure an injected channel. EDIT: I just noticed the note on ScanConvMode: ''[If disabled] Parameters 'NbrOfConversion' and 'InjectedNbrOfConversion' are discarded (equivalent to set to 1).'' So, I'm guessing I just need to have ScanConvMode disable then? Additionally, I'm wondering about the configuration of TIM1_CH4. Do I need to configure this as OC or PWM? (Snippet taken out of context, assuming the code to configure pwmOutTimer is correct)

adcSyncConfig.OCMode = TIM_OCMODE_PWM1;
adcSyncConfig.OCFastMode = TIM_OCFAST_DISABLE;
adcSyncConfig.OCIdleState = TIM_OCIDLESTATE_SET;
adcSyncConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
adcSyncConfig.OCPolarity = TIM_OCPOLARITY_LOW;
adcSyncConfig.OCNPolarity = TIM_OCNPOLARITY_LOW;
adcSyncConfig.Pulse = 0;
HAL_TIM_PWM_ConfigChannel(&pwmOutTimer, &adcSyncConfig, TIM_CHANNEL_4);
 HAL_TIM_PWM_Start(&pwmOutTimer, TIM_CHANNEL_4);

ADC setup:

void InitAdc()
{
// Enable Clocks
__GPIOC_CLK_ENABLE();
__ADC1_CLK_ENABLE();
__DMA2_CLK_ENABLE();
// Common current sense GPIO
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
// Gate driver 1: SO1
GPIO_InitStruct.Pin = GPIO_PIN_1;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
// Gate driver 2: SO2
GPIO_InitStruct.Pin = GPIO_PIN_2;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
// Configure the ADC
adcHandle.Instance = ADC1;
adcHandle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
adcHandle.Init.Resolution = ADC_RESOLUTION_12B;
adcHandle.Init.ScanConvMode = DISABLE; 
adcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
adcHandle.Init.ContinuousConvMode = DISABLE;
adcHandle.Init.DiscontinuousConvMode = DISABLE;
adcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
adcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
adcHandle.Init.EOCSelection = DISABLE;
adcHandle.Init.DMAContinuousRequests = DISABLE;
adcHandle.Init.NbrOfConversion = 0;
adcHandle.Init.NbrOfDiscConversion = 0;
// Commit the ADC
HAL_ADC_Init(&adcHandle);
// Configure for injected channels
ADC_InjectionConfTypeDef adcInjectedConfig;
adcInjectedConfig.AutoInjectedConv = DISABLE; // As per note in driver
adcInjectedConfig.ExternalTrigInjecConv = ADC_EXTERNALTRIGINJECCONV_T1_CC4; // TIM1 compare
adcInjectedConfig.ExternalTrigInjecConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; //
adcInjectedConfig.InjectedDiscontinuousConvMode = DISABLE; // Because we are using main seq
adcInjectedConfig.InjectedSamplingTime = ADC_SAMPLETIME_3CYCLES;
adcInjectedConfig.InjectedOffset = 0;
// Channel 11 :: SO1
adcInjectedConfig.InjectedChannel = ADC_CHANNEL_11;
adcInjectedConfig.InjectedRank = ADC_INJECTED_RANK_1;
HAL_ADCEx_InjectedConfigChannel(&adcHandle, &adcInjectedConfig);
// Channel 12 :: SO2
adcInjectedConfig.InjectedChannel = ADC_CHANNEL_11;
adcInjectedConfig.InjectedRank = ADC_INJECTED_RANK_2;
HAL_ADCEx_InjectedConfigChannel(&adcHandle, &adcInjectedConfig);
// Configure DMA
adcDmaHandle.Instance = DMA2_Stream0;
adcDmaHandle.Init.Channel = DMA_CHANNEL_0;
adcDmaHandle.Init.Direction = DMA_PERIPH_TO_MEMORY;
adcDmaHandle.Init.PeriphInc = DMA_PINC_DISABLE;
adcDmaHandle.Init.MemInc = DMA_MINC_ENABLE;
adcDmaHandle.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
adcDmaHandle.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
adcDmaHandle.Init.Mode = DMA_CIRCULAR;
adcDmaHandle.Init.Priority = DMA_PRIORITY_HIGH;
adcDmaHandle.Init.MemBurst = DMA_MBURST_SINGLE;
adcDmaHandle.Init.PeriphBurst = DMA_PBURST_SINGLE;
// Bring DMA up 
HAL_DMA_Init(&adcDmaHandle);
// Associate the DMA handle
__HAL_LINKDMA(&adcHandle, DMA_Handle, adcDmaHandle);
// NVIC configuration for DMA Input data interrupt
HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn);
// Start the conversion
HAL_ADC_Start_DMA(&adcHandle, conversionResults, 2);
}

#!stm32-!tim-!adc-!pwm