STM32 tim8 pb1輸出不了pwm pc7 正常輸出?

ID:751817 · 發(fā)表于 2020-7-9 22:32

#include "xctim.h"

void cxtim_init(void)
{
      GPIO_InitTypeDef             gpio_struct;
      TIM_TimeBaseInitTypeDef       tim_struct;
      TIM_OCInitTypeDef             tim_ocstruct;
      TIM_OCInitTypeDef             tim_ocstruct2;

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC |
                              RCC_APB2Periph_TIM8,ENABLE);

      //gpiob 1
      gpio_struct.GPIO_Pin          =    GPIO_Pin_1;
      gpio_struct.GPIO_Mode          =    GPIO_Mode_AF_PP;
      gpio_struct.GPIO_Speed       =    GPIO_Speed_50MHz;
      GPIO_Init(GPIOB,&gpio_struct);
      //gpioc 7
      gpio_struct.GPIO_Pin          =    GPIO_Pin_7;
      gpio_struct.GPIO_Mode          =    GPIO_Mode_AF_PP;
      gpio_struct.GPIO_Speed       =    GPIO_Speed_50MHz;
      GPIO_Init(GPIOC,&gpio_struct);

      tim_struct.TIM_Period          =    255;
      tim_struct.TIM_Prescaler       =    (72-1);
      tim_struct.TIM_CounterMode    =    TIM_CounterMode_Up;
      TIM_TimeBaseInit(TIM8,&tim_struct);

      tim_ocstruct.TIM_OCMode       =    TIM_OCMode_PWM1;
      tim_ocstruct.TIM_OutputState =    TIM_OutputState_Enable;
      tim_ocstruct.TIM_OCPolarity    =    TIM_OCPolarity_High;
      tim_ocstruct.TIM_OCIdleState =    TIM_OCIdleState_Reset;
      tim_ocstruct.TIM_Pulse       =    20;
      TIM_OC2Init(TIM8,&tim_ocstruct);

      tim_ocstruct2.TIM_OCMode       =    TIM_OCMode_PWM1;
      tim_ocstruct2.TIM_OutputNState =    TIM_OutputNState_Enable;
      tim_ocstruct2.TIM_OCNPolarity =    TIM_OCNPolarity_High;
      tim_ocstruct2.TIM_OCNIdleState =    TIM_OCNIdleState_Reset;
      tim_ocstruct2.TIM_Pulse       =    20;
      TIM_OC3Init(TIM8,&tim_ocstruct2);

      TIM_CtrlPWMOutputs(TIM8,ENABLE);

      TIM_OC2PreloadConfig(TIM8,TIM_OCPreload_Enable);
      TIM_OC3PreloadConfig(TIM8,TIM_OCPreload_Enable);

      TIM_ARRPreloadConfig(TIM8,ENABLE);

      TIM_Cmd(TIM8,ENABLE);

}

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