为什么我的程序接入LED灯一直亮，不闪烁呢？求大佬指点

424582154

#include "stm32f10x.h"
#include "stm32f10x_tim.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x.h"
#include "sys.h"
void TIM2_PWM_Init(u16 arr,u16 psc)
{
  GPIO_InitTypeDef GPIO_InitStructure;  
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_TIM2, ENABLE);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period=arr ;
TIM_TimeBaseStructure.TIM_Prescaler=psc ;
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_RepetitionCounter=0x0;
TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);

TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;

TIM_OCInitStructure.TIM_Pulse=5000;
   TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;

  TIM_OC1Init(TIM2,&TIM_OCInitStructure);
TIM_OC2Init(TIM2,&TIM_OCInitStructure);
TIM_OC3Init(TIM2,&TIM_OCInitStructure);
TIM_OC4Init(TIM2,&TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM2,TIM_OCPreload_Enable);
TIM_OC2PreloadConfig(TIM2,TIM_OCPreload_Enable);
TIM_OC3PreloadConfig(TIM2,TIM_OCPreload_Enable);
TIM_OC4PreloadConfig(TIM2,TIM_OCPreload_Enable);

TIM_Cmd(TIM2,ENABLE);


}
void delay_ms(u16 t)
{
  u16 i=0;
while(t--)
{
   i=12000;
  while(i--);
}
}
int main(void)
{
  TIM2_PWM_Init(9999,719);
  while(1)
{
  TIM_SetCompare1(TIM2,2000);
  TIM_SetCompare2(TIM2,4000);
  TIM_SetCompare3(TIM2,6000);
  TIM_SetCompare4(TIM2,8000);
  delay_ms(50);
}
}

DFY

你这个配置有问题 ，你把每个通道的CCRx都设定了，都没有改变，也就是没有改变PWM的占空比，所以占空比一直保持，当然灯不会变化你要把TIM_SetCompare1的值不断的修改
while(1)
{
  TIM_SetCompare1(TIM2,2000);
  TIM_SetCompare2(TIM2,4000);
  TIM_SetCompare3(TIM2,6000);
  TIM_SetCompare4(TIM2,8000);
  delay_ms(50);
}

三叶草

配置不正确吧

陆行

TIM_SetCompare1(TIM2,2000);
  delay_ms(50);
  TIM_SetCompare1(TIM2,4000);
  delay_ms(50);
  TIM_SetCompare1(TIM2,6000);
  delay_ms(50);
  TIM_SetCompare1(TIM2,8000);
  delay_ms(50);