TIM1多路PWM的DMA控制

wenbo 提问时间：2017-9-5 11:51 /

我现在使用STM32F103VET6做一款设计，要求输出3路PWM，3路PWM的频率相同，相位相同，但占空比单独可调。如果1路PWM，可以开DMA控制，比较简单。但3路PWM单独控制占空比，开DMA就比较麻烦了。我实验了一下TIM1_DCR 和TIM1_DMAR，试了2小时没有成功。有没有成功用过这个功能的？
  上代码：DMA_InitTypeDef DMA_InitStructure;
//for test
u16 i;
for(i=0;i<300;i++)
{
Sin[3*i] = (0x01&i)*2400+1200;
Sin[3*i+2] = (0x01&i)*1200+1200;
Sin[3*i+1] = 600;
}

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

  /* DMA1 Channel5 Config */
  DMA_DeInit(DMA1_Channel5);

  //to DMAR
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(TIM1->DMAR);
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)Sin;    //src
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;

  DMA_InitStructure.DMA_BufferSize = 900;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Enable;//两种配置都试了
  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_Circular;//两种配置都试了

  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

DMA_Init(DMA1_Channel5, &DMA_InitStructure);
//CCR1 CCR2 CCR3
TIM_DMAConfig(TIM1, TIM_DMABase_CCR1, 3);

//
TIM_DMACmd(TIM1, TIM_DMA_Update, ENABLE);

/* TIM1 counter enable */
  TIM_Cmd(TIM1, ENABLE);
/* DMA1 Channel5 enable */

DMA_Cmd(DMA1_Channel5, ENABLE);
  /* TIM1 Main Output Enable */
TIM_CtrlPWMOutputs(TIM1, ENABLE);