Question
STM32f3 ADC & DMA Problem
Posted on October 04, 2015 at 15:30
Hey,
i am trying hard to get the DMA & ADC controller to work on my discovery board. I want to sample PA1&2, which are connected to current shunts.the following code is not working, and i am not sure why. the DMA_IT_TC is called once. i start the conversion in the TIM1_CC4 withDMA_SetCurrDataCounter(DMA1_Channel1, 2);DMA_Cmd(DMA1_Channel1, ENABLE);ADC_StartConversion(ADC1);this is my init_code:uint16_t ADCBuffer[] = {1,1};void ADC_DMA_Config(void){ RCC_ADCCLKConfig(RCC_ADC12PLLCLK_Div2); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_ADC12, ENABLE); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 ; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ; GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 ; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ; GPIO_Init(GPIOA, &GPIO_InitStructure); ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; ADC_CommonInitStructure.ADC_Clock = ADC_Clock_AsynClkMode; ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; ADC_CommonInitStructure.ADC_DMAMode = ADC_DMAMode_OneShot; ADC_CommonInitStructure.ADC_TwoSamplingDelay = 10; ADC_CommonInit(ADC1, &ADC_CommonInitStructure); ADC_InitStructure.ADC_ContinuousConvMode = ADC_ContinuousConvMode_Disable; ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; ADC_InitStructure.ADC_ExternalTrigConvEvent = ADC_ExternalTrigConvEvent_0; ADC_InitStructure.ADC_ExternalTrigEventEdge = ADC_ExternalTrigEventEdge_None; ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; ADC_InitStructure.ADC_OverrunMode = ADC_OverrunMode_Disable; ADC_InitStructure.ADC_AutoInjMode = ADC_AutoInjec_Disable; ADC_InitStructure.ADC_NbrOfRegChannel = 2; ADC_Init(ADC1, &ADC_InitStructure); /* ADC1 regular channel7 configuration */ ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 1, ADC_SampleTime_7Cycles5); ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 2, ADC_SampleTime_7Cycles5); DMA_StructInit(&DMA_InitStructure); DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(ADC1->DR); DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADCBuffer; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; DMA_InitStructure.DMA_BufferSize = 2; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; DMA_Init(DMA1_Channel1, &DMA_InitStructure); DMA_ClearITPendingBit(DMA1_IT_TC1); DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE); NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); /* Enable ADC1 */ ADC_DMAConfig( ADC1, ADC_DMAMode_OneShot); ADC_DMACmd(ADC1, ENABLE); ADC_Cmd(ADC1, ENABLE); }