STM32F3 探索板 ADC DMA 传输不工作

Question

我正在使用 STM32F303（探索板）并尝试从定时器信号 TRGO2 外部触发 ADC 转换并通过 DMA 将其存储到缓冲区。但是，似乎没有任何内容被写入该缓冲区。有人可以查看我的初始化代码并让我知道我在初始化过程中是否搞砸了吗？我知道定时器触发有效，因为当我启用 ADC 中断时我能够读取 ADC 值。

void InitADC(void)
{
     int i;
     ADC_InitTypeDef       ADC_InitStructure;
     ADC_CommonInitTypeDef ADC_CommonInitStructure;
     GPIO_InitTypeDef    GPIO_InitStructure;
     NVIC_InitTypeDef    NVIC_InitStructure;
     DMA_InitTypeDef         DMA_InitStructure;


     RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

     DMA_DeInit(DMA1_Channel1);

     DMA_InitStructure.DMA_BufferSize = 2;
     DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
     DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
     DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)adcBuffer;
     DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
     DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
     DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
     DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC2->DR;
     DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
     DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
     DMA_InitStructure.DMA_Priority = DMA_Priority_High;
     DMA_Init(DMA1_Channel1, &DMA_InitStructure);

     DMA_Cmd(DMA1_Channel1, ENABLE);

     /* Configure the ADC clock */
     RCC_ADCCLKConfig(RCC_ADC12PLLCLK_Div2);

     /* Enable ADC12 clock */
     RCC_AHBPeriphClockCmd(RCC_AHBPeriph_ADC12, ENABLE);

     ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
     ADC_CommonInitStructure.ADC_Clock = ADC_Clock_SynClkModeDiv1;
     ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1;
     ADC_CommonInitStructure.ADC_DMAMode = ADC_DMAMode_OneShot;
     ADC_CommonInitStructure.ADC_TwoSamplingDelay = 0;

     ADC_CommonInit(ADC2, &ADC_CommonInitStructure);

     /* GPIOA Periph clock enable */
     RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

     /* Configure ADC2 Channel1 as analog input */
     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
     GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
     GPIO_Init(GPIOA, &GPIO_InitStructure);

     ADC_StructInit(&ADC_InitStructure);

     /* Calibration procedure */
     ADC_VoltageRegulatorCmd(ADC2, ENABLE);
     for(i = 0; i < 1000; i++) {}

     ADC_SelectCalibrationMode(ADC2, ADC_CalibrationMode_Single);
     ADC_StartCalibration(ADC2);

     while(ADC_GetCalibrationStatus(ADC2) != RESET );

     ADC_InitStructure.ADC_ContinuousConvMode = ADC_ContinuousConvMode_Disable;
     ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
     ADC_InitStructure.ADC_ExternalTrigConvEvent = ADC_ExternalTrigConvEvent_10;
     ADC_InitStructure.ADC_ExternalTrigEventEdge = ADC_ExternalTrigEventEdge_RisingEdge;
     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(ADC2, &ADC_InitStructure);

     /* ADC2 regular channel1 configuration */
     ADC_RegularChannelConfig(ADC2, ADC_Channel_1, 1, ADC_SampleTime_7Cycles5);
     ADC_RegularChannelConfig(ADC2, ADC_Channel_2, 2, ADC_SampleTime_7Cycles5);

     /* Configure and enable DMA interrupt */
     NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
     NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
     NVIC_Init(&NVIC_InitStructure);

     /* Enable interrupt */
     7DMA_ITConfig(DMA1_Channel1, DMA1_IT_TC1, ENABLE);

     /* Configures the ADC DMA */
     ADC_DMAConfig(ADC2, ADC_DMAMode_Circular);
     /* Enable the ADC DMA */
     ADC_DMACmd(ADC2, ENABLE);

     /* Enable ADC2 */
     ADC_Cmd(ADC2, ENABLE);
     ADC_DMACmd(ADC2, ENABLE);

     /* wait for ADRDY */
     while(!ADC_GetFlagStatus(ADC2, ADC_FLAG_RDY));

     /* Start ADC2 Software Conversion */
     ADC_StartConversion(ADC2);
}

void DMA1_Channel1_IRQHandler(void)
{
     if (DMA_GetFlagStatus(DMA1_FLAG_TC1) != RESET)
     {
         DMA_ClearITPendingBit(DMA1_FLAG_TC1);
         adcBuffer[0] = (adcBuffer[0] * ADC_VREF) >> 12;
         adcBuffer[1] = (adcBuffer[1] * ADC_VREF) >> 12;
     } 
}

这里是相关的ADC和DMA寄存器内容：

ADC2 CR：0x10000005

ADC2 CFGR：0x00000683

DMA1_CH1 CCR：0x000025A3

DMA1_CH1 CNDTR: 0x00000002

DMA1_CH1 CPAR：0x50000140

DMA1_CH1 CMAR：0x2000001C

Answer 1

我似乎已经解决了这个问题。进一步查看数据表，我意识到 ADC2 未连接到 DMA1 通道 1：

到 ADC2 的正确 DMA 连接是 DMA2 通道 1：

STM32F3 探索板 ADC DMA 传输不工作

STM32F3 Discovery board ADC DMA transfer not working

stm32

dma

adc

stm32ldiscovery