关于f4定时器6更新触发DMA请求不起作用的问题

jsrdczy · 发表于 2019-9-6 15:06:58

我利用基本定时器6的更新触发DMA，然后从内存到外设更新tim6->ARR。问题时DMA没有搬运数据到ARR中。现在的情况时tim6正常产生了更新时间，并且ARR也能手动更新，但是就是DMA不起作用。
实在想不明白，各位大佬求助。
代码如下
uint16_t fbuff;

void DMA_CONFIG(vioid)
{
   TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
   NVIC_IniitTypeDef NVIC_InitStructure;
   DMA_InitTYpeDef DMA_InitStruct;
   uint32_t padr = (uint32_t)&TIM6->ARR;
   uint32_t madr = (uint32_t)&fbuff;

   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6,ENABLE);
   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);

   TIM_TimeBaseStructure.TIM_Period = 10-1;
   TIM_TimeBaseStructure.TIM_Prescaler = 8400 -1;
   TIM_TimeBaseStructure.TIM_ClockDivision = 0;
   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
   TIM_TimeBaseInit(TIM6,&TIM_TimeBaseStructure);
   TIM_DMACmd(TIM6,TIM_DMA_Update,ENABLE);
   TIM_ITConfig(TIM6,TIM_IT_Update,ENABLE);//打开更新DMA请求

   NVIC_InitStructure.NVIC_IRQChannel = TIM6_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 8;
   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
   NVIC_Init(&NVIC_InitStructure);

   DMA_DeInit(DMA1_Stream1);
   DMA_Cmd(DMA1_Stream1,DISABLE);
   DMA_InitStruct.DMA_Channel = 7;
   DMA_InitStruct.DMA_PeripheralBaseAddr = padr;
   DMA_InitStruct.DMA_Memory0BaseAddr = madr;
   DMA_InitStruct.DMA_DIR = DMA_DIR_MemoryToPeripherl;
   DMA_InitStruct.DMA_BufferSize = 1;
   DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
   DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Disable;
   DMA_InitStruct.DMA_PeripheralDataSize =  DMA_PeripheralDataSize_HalfWord;
   DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
   DMA_InitStruct.DMA_Mode = DMA_Mode_Normal;
   DMA_InitStruct.DMA_Priority = DMA_Priority_VeryHigh;
   DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable;
   DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
   DMA_InitStruct.DMA_MemoryBurst =DMA_MemoryBurst_Single;

   DMA_InitStruct.DMA_PeripheralBurst =DMA_PeripheralBurst_Single;
   DMA_Init(DMA1_Stream1,&DMA_InitStruct);
   TIM_Cmd(TIM6,ENABLE);

}
void TIME6_IRQHandler(void)
{
   if(TIM_GetITStatus(TIM6,TIM_IT_Update) !=RESET)

      TIM_ClearITPendingBit(TIM6,TIM_IT_Update);

}

void main(void)
{
   u16 input;

   DMA_CONFIG();
   while(1)
   {
         fbuff = 10 + input; //input为外部可控输入

         if(Key_Scan(0) == 1)
         {
               DMA1_Stream1->CR &= 0xFFFFFFFE;
               DMA1_Stream1->NDTR = 1;
               DMA1_Stream1->CR |=0x00000001;//进行一次DMA传输

         }

   }

}