求助STM32F103ZET6 TIM8 DMA

kaowb · 发表于 2021-8-19 13:47:46

想问一下，有人用过STM32F103的TIM8定时器的DMA功能吗，我这边配置别的定时器可以，但是TIM8的不行，TIM8的三通道可以，但有别的用，其它都不行，不只是硬件不支持还是代码有问题？
初始化代码
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);       //引脚PA2
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);
TIM_TimeBaseStructure.TIM_Period = 90-1; // 800kHz 90-1
TIM_TimeBaseStructure.TIM_Prescaler = 1-1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_CtrlPWMOutputs(TIM8,ENABLE);

TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
   TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset ;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
TIM_OC2Init(TIM8, &TIM_OCInitStructure);

/* configure DMA */
/* DMA clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);
DMA_DeInit(DMA2_Channel5);

DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&TIM8->CCR2;       // physical address of Timer 3 CCR4
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)LED_BYTE_Buffer;       // this is the buffer memory
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;                      // data shifted from memory to peripheral
DMA_InitStructure.DMA_BufferSize = 24;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                   // automatically increase buffer index
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;                         // stop DMA feed after buffer size is reached
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

DMA_Init(DMA2_Channel5, &DMA_InitStructure);
TIM_DMACmd(TIM8, TIM_DMA_Update, ENABLE);

传递数据时的代码
  DMA_SetCurrDataCounter(DMA2_Channel5, PIXEL_NUM*GRB+2);    // load number of bytes to be transferred
  DMA_Cmd(DMA2_Channel5, ENABLE);
  TIM_Cmd(TIM8, ENABLE);
  while(!DMA_GetFlagStatus(DMA2_FLAG_TC5)) ;
  TIM_Cmd(TIM8, DISABLE);
  DMA_Cmd(DMA2_Channel5, DISABLE);
  DMA_ClearFlag(DMA2_FLAG_TC5);