stm32f103x 输出pwm

jiangxun

#include "pbdata.h"

void RCC_Configuration(void);
void GPIO_Configuration(void);
void TIM2_Configuration(void);

int main(void)
{
  //u8 led_fx=1;
  u16 led_dt=40000;

  RCC_Configuration();
  GPIO_Configuration();
  TIM2_Configuration();
  while(1)
  {  
TIM_SetCompare1(TIM2, led_dt);
  }
}

void RCC_Configuration(void)
{
   
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
}

void GPIO_Configuration(void)
{
SystemInit();
GPIO_InitTypeDef GPIO_InitStructure;
   TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
   TIM_OCInitTypeDef TIM_OCInitStructure;

   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);


   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;  //PA3
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
   GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void TIM2_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStruct;
TIM_OCInitTypeDef TIM_OCInitStructure;
GPIO_PinRemapConfig(GPIO_PartialRemap1_TIM2,ENABLE);

TIM_TimeBaseStruct.TIM_Period = 62599;             
   TIM_TimeBaseStruct.TIM_Prescaler = 22;//(psc+1)*100-1
   TIM_TimeBaseStruct.TIM_ClockDivision = TIM_CKD_DIV1;
   TIM_TimeBaseStruct.TIM_CounterMode = TIM_CounterMode_Up;
   TIM_TimeBaseInit(TIM2, & TIM_TimeBaseStruct);

   TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;    
   TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;
   TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
   TIM_OC2Init(TIM2, &TIM_OCInitStructure);
   TIM_OC2PreloadConfig(TIM2,TIM_OCPreload_Enable);    
   TIM_SelectOnePulseMode(TIM2, TIM_OPMode_Single);                            
   TIM_Cmd(TIM2,ENABLE);

}

我用的是STM32F103C8T6的mcu，请问为何PA3输出不了PWM。。。  

lycreturn

PA3是定时器2通道4   
   TIM_OC2Init(TIM2, &TIM_OCInitStructure);
   TIM_OC2PreloadConfig(TIM2,TIM_OCPreload_Enable);
你这2句 配置的是通道2  肯定不会有输出的了  
主要还是因为你没去理解这些语句的具体意思  只是根据自己的猜测胡乱的使用