mini板输出多路pwm信号，

流芷静兰 · 发表于 2017-8-5 20:23:29

本帖最后由流芷静兰于 2017-8-5 20:27 编辑

直接在PWM输出实验的例程上改的，为什么总是输出不成功呢？
#include "pwm.h"

void TIM1_PWM_Init(u16 arr,u16 psc){
  GPIO_InitTypeDef GPIO_InitStructure;
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //TIM_CH4
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  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(TIM1, &TIM_TimeBaseStructure);

  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_OC4Init(TIM1, &TIM_OCInitStructure);

  TIM_CtrlPWMOutputs(TIM1,ENABLE);

  TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);

TIM_ARRPreloadConfig(TIM1, ENABLE);
  TIM_Cmd(TIM1, ENABLE);

}