求助，tim3输出两路pwm

HUANG123456 · 发表于 2018-4-3 11:19:58

#include "pwm.h"
#include "stm32f10x.h"
#include "sys.h"
#include "led.h"

void TIM3_PWM_Init(u16 psc,u16 arr)
{
      GPIO_InitTypeDef GPIO_InitStructure; //¶¨òåGPIO½á11ìå
      TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; //¶¨òåTIM3õê¼»ˉ½á11ìå
      TIM_OCInitTypeDef TIM_OCInitStructure;


      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);



      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6| GPIO_Pin_7;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

//       GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
//       GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
//       GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
//       GPIO_Init(GPIOA, &GPIO_InitStructure);

      TIM_TimeBaseStructure.TIM_Period = arr;
      TIM_TimeBaseStructure.TIM_Prescaler =psc;
      TIM_TimeBaseStructure.TIM_ClockDivision = 0;
      TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
      TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;


      TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
      TIM_OCInitStructure.TIM_Pulse = 0;
      TIM_OC1Init(TIM3, &TIM_OCInitStructure);
      TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);


      //TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
      TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
      TIM_OCInitStructure.TIM_Pulse = 0;
      //TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
      TIM_OC2Init(TIM3, &TIM_OCInitStructure);

      //TIM_CtrlPWMOutputs(TIM1,ENABLE);
      TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);

      TIM_ARRPreloadConfig(TIM3, ENABLE);

      TIM_Cmd(TIM3, ENABLE);
}

#include "stm32f10x.h"
#include "sys.h"
#include "led.h"
#include "delay.h"
#include "pwm.h"

void main(void)
{
      u8 dir=1;
      u16 ledpwmval=0;
      delay_init();
      LED_Init();
      TIM3_PWM_Init(0,899);
      while(1)
      {
            delay_ms(10);
            if(dir==1)
            {ledpwmval++;
            }
            else
            {

                     ledpwmval--;
            }
            if(ledpwmval>300) {
                     dir=0;
            }
                     if(ledpwmval==0) dir=1;
            TIM_SetCompare1(TIM3,ledpwmval);
            TIM_SetCompare2(TIM3,ledpwmval);
      }
}

我是想用tim3的ch1和ch2输出两路pwm控制两个LED的亮度的，但是一个灯都点不亮。。。求大佬指点