stm32f042 tim2 ch1 采用pwm dma方式输出波形，TIM-CCR1中一直没有值，代码如下，求帮助

syfchao

void TIM2_PWM_Init(void)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;

        RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;                                //
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
        GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOA, &GPIO_InitStructure);
        GPIO_PinAFConfig(GPIOA, GPIO_PinSource0, GPIO_AF_2);
       
        /* Time base configuration */
        TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(SystemCoreClock / WS2812B_TMI_CLOCK) - 1;//psc;
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
        TIM_TimeBaseStructure.TIM_Period = WS2812B_TIM_PERIOD;//arr; // 800kHz
        TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
        //TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
        TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
//   TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
        TIM_OCInitStructure.TIM_Pulse =  0;//3õê¼»ˉÕ¼¿Õ±è
//   TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
        TIM_OC1Init(TIM2, &TIM_OCInitStructure);
        TIM_OC1PreloadConfig(TIM2,TIM_OCPreload_Enable);
  TIM_ARRPreloadConfig(TIM2,ENABLE);
        TIM_Cmd(TIM2, ENABLE);
}

void TIM2_DMA_Init(void){
       
        DMA_InitTypeDef DMA_InitStructure;
        RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);       
        DMA_DeInit(DMA1_Channel5);
        DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)TIM2_CCR1_Address;//&TIM2->CCR1;(此寄存器监测不到值 不知道为什么)        // physical address of Timer 3 CCR1
        DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ws2812bBuff;                // this is the buffer memory
        DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;                                                // data shifted from memory to peripheral
        DMA_InitStructure.DMA_BufferSize = WS2812B_BUFF_SIZE;
        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_Medium;
        DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
        DMA_Init(DMA1_Channel5, &DMA_InitStructure);
        TIM_DMACmd(TIM2, TIM_DMA_CC1, ENABLE);
        TIM_DMACmd(TIM2, TIM_DMA_Update, ENABLE);
        DMA_Cmd(DMA1_Channel5, ENABLE);                         // enable DMA channel 7
        TIM_Cmd(TIM2, ENABLE);
        memset(ws2812bBuff,5,WS2812B_BUFF_SIZE);
}


此代码在f1上运行完好，f030 TIM1 运行完好，不知道为什么f042 TIM2 CH1不行

正点原子

帮顶

syfchao

所有f0定时器2均不能实现，输出的都是占空比为50的波，定时器1 3没问题