pwm.c

#include "pwm.h"

//TIM3-CH3

//PB0

void PWM_Config(void)

{

	GPIO_InitTypeDef GPIO_InitStruct;

	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;

	TIM_OCInitTypeDef TIM_OCInitStruct;

	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

	GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF_PP;

	GPIO_InitStruct.GPIO_Pin=GPIO_Pin_0;

	GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;

	GPIO_Init(GPIOB, &GPIO_InitStruct);

	TIM_TimeBaseInitStruct.TIM_CounterMode=TIM_CounterMode_Up;

	TIM_TimeBaseInitStruct.TIM_Period=9999;

	TIM_TimeBaseInitStruct.TIM_Prescaler=71;

	TIM_TimeBaseInitStruct.TIM_ClockDivision=0;

	TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStruct);

	TIM_OCInitStruct.TIM_OCPolarity=TIM_OCPolarity_Low;

	TIM_OCInitStruct.TIM_OCMode=TIM_OCMode_PWM1;

	TIM_OCInitStruct.TIM_OutputState=TIM_OutputState_Enable;

	TIM_OCInitStruct.TIM_Pulse=4999;

	TIM_OC3Init(TIM3, &TIM_OCInitStruct);

	TIM_Cmd(TIM3, ENABLE);

}

pwm.h

#ifndef __PWM_H

#define __PWM_H

#include "stm32f10x.h"

void PWM_Config(void);

#endif

main.c

#include "stm32f10x.h"

#include "pwm.h"

#include "delay.h"

uint16_t a = 0;

int main(void)

{

	PWM_Config();

	delay_init();

	while(1)

	{

		for(a = 4999; a > 0; a--)

		{

			TIM_SetCompare3(TIM3, a);

			delay_us(200);

		}

		for(a = 0; a < 5000; a++)

		{

			TIM_SetCompare3(TIM3, a);

			delay_us(200);

		}

	}

}

用了重映射则需要

开启复用时钟
使能GPIO重映射GPIO_PinRemapConfig
GPIO输出模式一定是复用推挽

STM32用PWM波控制呼吸灯代码的相关教程结束。