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用STM32H750的DAC用DMA输出正弦波

husankeke 提问时间：2019-10-29 19:57 /

问答
是否解决:

本人用STM32F334实现了DAC采用DMA方式输出正弦波，用定时器控制频率。后来我用STM32H750芯片尝试，发现DAC和定时器都是正常工作，DMA输出不了数据，看了好多遍H750的手册，DMA的配置以我现有的水平看不出有任何问题。想请各位前辈来看看我这出了什么问题。
正弦信号输出程序：
void sin_Generation(void)
{
uint16_t n;
for(n=0;n<tableSize;n++)
{
  sinTable[n] = (sin(2*PI*n/tableSize)+1)*2047;
}
}
主函数部分：
int main(void)
{

   HAL_Init();

   SystemClock_Config();
   sin_Generation();
   MX_GPIO_Init();
   MX_DMA_Init();
   MX_DAC1_Init();
   MX_TIM6_Init();
   HAL_DAC_Start_DMA(&hdac1,DAC_CHANNEL_1,sinTable,tableSize,DAC_ALIGN_12B_R);
   while (1)
   {

   }
}
DAC的初始化函数：

static void MX_DAC1_Init(void)
{

DAC_ChannelConfTypeDef sConfig = {0};

hdac1.Instance = DAC1;
if (HAL_DAC_Init(&hdac1) != HAL_OK)
{
      Error_Handler();
}

sConfig.DAC_SampleAndHold = DAC_SAMPLEANDHOLD_DISABLE;
sConfig.DAC_Trigger = DAC_TRIGGER_T6_TRGO;
sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
sConfig.DAC_ConnectOnChipPeripheral = DAC_CHIPCONNECT_DISABLE;
sConfig.DAC_UserTrimming = DAC_TRIMMING_FACTORY;
if (HAL_DAC_ConfigChannel(&hdac1, &sConfig, DAC_CHANNEL_1) != HAL_OK)
{
      Error_Handler();
}

}
定时器6的初始化：
static void MX_TIM6_Init(void)
{

TIM_MasterConfigTypeDef sMasterConfig = {0};

htim6.Instance = TIM6;
htim6.Init.Prescaler = 2;
htim6.Init.CounterMode = TIM_COUNTERMODE_UP;
htim6.Init.Period = 99;
htim6.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim6) != HAL_OK)
{
      Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim6, &sMasterConfig) != HAL_OK)
{
      Error_Handler();
}

HAL_TIM_Base_Start(&htim6);

}
DMA的时钟开启：
static void MX_DMA_Init(void)
{

__HAL_RCC_DMA1_CLK_ENABLE();

HAL_NVIC_SetPriority(DMA1_Stream0_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Stream0_IRQn);

HAL_NVIC_SetPriority(DMAMUX1_OVR_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMAMUX1_OVR_IRQn);
}
到此main.c文件结束，DMA的配置和DAC的IO口配置在msp.c文件中

void HAL_DAC_MspInit(DAC_HandleTypeDef* hdac)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(hdac->Instance==DAC1)
{

      __HAL_RCC_DAC12_CLK_ENABLE();

      __HAL_RCC_GPIOA_CLK_ENABLE();

//PA4    ------> DAC1_OUT1

      GPIO_InitStruct.Pin = GPIO_PIN_4;
      GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
      GPIO_InitStruct.Pull = GPIO_NOPULL;
      HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

      hdma_dac1_ch1.Instance = DMA1_Stream1;
      hdma_dac1_ch1.Init.Request = DMA_REQUEST_DAC1;
      hdma_dac1_ch1.Init.Direction = DMA_MEMORY_TO_PERIPH;
      hdma_dac1_ch1.Init.PeriphInc = DMA_PINC_DISABLE;
      hdma_dac1_ch1.Init.MemInc = DMA_MINC_ENABLE;
      hdma_dac1_ch1.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
      hdma_dac1_ch1.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
      hdma_dac1_ch1.Init.Mode = DMA_CIRCULAR;
      hdma_dac1_ch1.Init.Priority = DMA_PRIORITY_MEDIUM;
      hdma_dac1_ch1.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
      if (HAL_DMA_Init(&hdma_dac1_ch1) != HAL_OK)
      {
         Error_Handler();
      }
      __HAL_LINKDMA(hdac,DMA_Handle1,hdma_dac1_ch1);

}
}

相关代码已经附上，求教DMA为何不通。