Main.c
#include "stm32f10x.h"
#include "pwm.h"
int main(void)
{
uint16_t a=0;
unsigned int b=0;
TIM3_PWM_Init(9999,0);
while(1)
{
if(b==1)a++;
else a--;
TIM_SetCompare2(TIM3,a);
if(a>=7999)b=0;
if(a==0)b=1;
}
}
pwm.c
#include "pwm.h"
#include "stm32f10x.h"
void TIM3_PWM_Init(uint16_t arr,uint16_t psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructyre;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
TIM_TimeBaseInitStructyre.TIM_Period=arr;
TIM_TimeBaseInitStructyre.TIM_Prescaler=psc;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructyre);
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;
TIM_OC2Init(TIM3,&TIM_OCInitStructure);
TIM_Cmd(TIM3,ENABLE);
}
pwm.h
#ifndef _PWM_H
#define _PWM_H
#include "stm32f10x.h"
void TIM3_PWM_Init(uint16_t arr,uint16_t psc);
#endif
