TIM4 四个pwm输出不了

帝二蛤

void TIM4_PWM_Init(u16 arr,u16 psc )
{                                                          
        //此部分需手动修改IO口设置
        GPIO_InitTypeDef GPIO_InitStructure={0};
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure={0};
        TIM_OCInitTypeDef  TIM_OCInitStructure={0};

        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);//TIM4时钟使能
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);//使能PORTB时钟            

       
        // 输出比较复用引脚映射到TIM4
        GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_TIM4);// CH1
        GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_TIM4);// CH2
        GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_TIM4);// CH3
        GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_TIM4);// CH4
        //TIM4_CH1 CH2 CH3 CH4
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9;//GPIOB...               
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能       
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//速度100MHz
        GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出
        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;         //上拉
        GPIO_Init(GPIOB, &GPIO_InitStructure);       
       
        TIM_TimeBaseStructure.TIM_Prescaler = psc;  //定时器分频
        TIM_TimeBaseStructure.TIM_Period = arr;   //自动重装载值      
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;        //向上计数模式
        TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
//        TIM_TimeBaseStruct.TIM_RepetitionCounter = 0;
        TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);//初始化定时器4
       

       
        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式2
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
//        TIM_OCInitStructure.TIM_Pulse = 0;//可       
        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //输出极性:TIM输出比较极性低

        TIM_OC1Init(TIM4, &TIM_OCInitStructure);//根据指定的参数初始化外设TIM4_OC1
        TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);  //使能TIM4在CCR1上的预装载寄存器
       
        TIM_OC2Init(TIM4, &TIM_OCInitStructure);//根据指定的参数初始化外设TIM4_OC2
        TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable);  //使能TIM4在CCR1上的预装载寄存器
       
        TIM_OC3Init(TIM4, &TIM_OCInitStructure);//根据指定的参数初始化外设TIM4_OC3
        TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);  //使能TIM4在CCR1上的预装载寄存器
       
        TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);  //使能TIM4在CCR1上的预装载寄存器
        TIM_OC4Init(TIM4, &TIM_OCInitStructure);//根据指定的参数初始化外设TIM4_OC4       
               
        TIM_ARRPreloadConfig(TIM4,ENABLE);//ARPE使能
        TIM_Cmd(TIM4,ENABLE);//使能TIM4       

}

eric2013

看着没什么问题，这个是TIM3的，四通输出，是可用的。

[C] 纯文本查看 复制代码

** @addtogroup TIM_PWM_Output
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
uint16_t CCR1_Val = 333;
uint16_t CCR2_Val = 249;
uint16_t CCR3_Val = 166;
uint16_t CCR4_Val = 83;
uint16_t PrescalerValue = 0;

/* Private function prototypes -----------------------------------------------*/
void TIM_Config(void);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured, 
       this is done through SystemInit() function which is called from startup
       file (startup_stm32f4xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32f4xx.c file
     */

  /* TIM Configuration */
  TIM_Config();

  /* -----------------------------------------------------------------------
    TIM3 Configuration: generate 4 PWM signals with 4 different duty cycles.
    
    In this example TIM3 input clock (TIM3CLK) is set to 2 * APB1 clock (PCLK1), 
    since APB1 prescaler is different from 1.   
      TIM3CLK = 2 * PCLK1  
      PCLK1 = HCLK / 4 
      => TIM3CLK = HCLK / 2 = SystemCoreClock /2
          
    To get TIM3 counter clock at 28 MHz, the prescaler is computed as follows:
       Prescaler = (TIM3CLK / TIM3 counter clock) - 1
       Prescaler = ((SystemCoreClock /2) /28 MHz) - 1
                                              
    To get TIM3 output clock at 30 KHz, the period (ARR)) is computed as follows:
       ARR = (TIM3 counter clock / TIM3 output clock) - 1
           = 665
                  
    TIM3 Channel1 duty cycle = (TIM3_CCR1/ TIM3_ARR)* 100 = 50%
    TIM3 Channel2 duty cycle = (TIM3_CCR2/ TIM3_ARR)* 100 = 37.5%
    TIM3 Channel3 duty cycle = (TIM3_CCR3/ TIM3_ARR)* 100 = 25%
    TIM3 Channel4 duty cycle = (TIM3_CCR4/ TIM3_ARR)* 100 = 12.5%

    Note: 
     SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f4xx.c file.
     Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate()
     function to update SystemCoreClock variable value. Otherwise, any configuration
     based on this variable will be incorrect.    
  ----------------------------------------------------------------------- */  

  /* Compute the prescaler value */
  PrescalerValue = (uint16_t) ((SystemCoreClock /2) / 28000000) - 1;

  /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 665;
  TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  /* PWM1 Mode configuration: Channel1 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

  TIM_OC1Init(TIM3, &TIM_OCInitStructure);

  TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);

  /* PWM1 Mode configuration: Channel2 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR2_Val;

  TIM_OC2Init(TIM3, &TIM_OCInitStructure);

  TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);

  /* PWM1 Mode configuration: Channel3 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR3_Val;

  TIM_OC3Init(TIM3, &TIM_OCInitStructure);

  TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);

  /* PWM1 Mode configuration: Channel4 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR4_Val;

  TIM_OC4Init(TIM3, &TIM_OCInitStructure);

  TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);

  TIM_ARRPreloadConfig(TIM3, ENABLE);

  /* TIM3 enable counter */
  TIM_Cmd(TIM3, ENABLE);

  while (1)
  {}
}

/**
  * @brief  Configure the TIM3 Ouput Channels.
  * @param  None
  * @retval None
  */
void TIM_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* TIM3 clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

  /* GPIOC and GPIOB clock enable */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOB, ENABLE);
  
  /* GPIOC Configuration: TIM3 CH1 (PC6) and TIM3 CH2 (PC7) */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 ;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
  GPIO_Init(GPIOC, &GPIO_InitStructure); 
  
  /* GPIOB Configuration:  TIM3 CH3 (PB0) and TIM3 CH4 (PB1) */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
  GPIO_Init(GPIOB, &GPIO_InitStructure); 

  /* Connect TIM3 pins to AF2 */  
  GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_TIM3);
  GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_TIM3); 
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource0, GPIO_AF_TIM3);
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_TIM3); 
}