Question

我正在使用STM32F103，尝试使用DMA从一个阵列复制到另一个阵列。传输第一次工作，DMA1_Channel1_IRQHandler中的断点被击中，但后续对DMA_Cmd(DMA1_Channel1, ENABLE)的调用无效，断点未被击中。未设置错误标志DMA1_FLAG_TE1。是否有其他需要设置/重置的内容才能使传输再次运行？

#include "stm32f10x.h"

#define ARRAYSIZE 800
volatile uint32_t status = 0;
volatile uint32_t i;


int main(void)
{
    uint32_t source[ARRAYSIZE];
    uint32_t destination[ARRAYSIZE];
    for (i=0; i<ARRAYSIZE;i++)
        source[i]=i;

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    DMA_InitTypeDef  DMA_InitStructure;
    DMA_DeInit(DMA1_Channel1);

    DMA_InitStructure.DMA_M2M = DMA_M2M_Enable;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
    DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Enable;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    DMA_InitStructure.DMA_BufferSize = ARRAYSIZE;
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)source;
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)destination;

    DMA_Init(DMA1_Channel1, &DMA_InitStructure);
    DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);

    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    status = 1;

    while (1)
      {
        if(status == 1)
        {
           status = 0;

           DMA1_Channel1->CNDTR = ARRAYSIZE;
           DMA1_Channel1->CPAR = (uint32_t)source;
           DMA1_Channel1->CMAR = (uint32_t)destination;
           DMA_ClearFlag(DMA1_FLAG_GL1);
           DMA_ClearFlag(DMA1_FLAG_TC1);

           DMA_Cmd(DMA1_Channel1, DISABLE);
           DMA_Cmd(DMA1_Channel1, ENABLE);
        }
      }
}

void DMA1_Channel1_IRQHandler(void)
{
  if(DMA_GetITStatus(DMA1_IT_TC1))
  {
    status=1;
    DMA_ClearITPendingBit(DMA1_IT_GL1);
  }
}

Answer 1

在设置寄存器之前禁用DMA，然后启用它。根据{{3}}（第287页），只能在禁用通道时写入DMA_CNDTRx。 DMA_CMARx也是如此。

STM32 DMA内存到内存传输仅触发一次

1 个答案: