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main.c
#include "led.h"
#include "delay.h"
#include "sys.h"
#include "pwm.h"
int main(void)
{
u16 led0pwmval=0;
delay_init();
TIM1_PWM_Init(1499,999);
while(1)
{
led0pwmval=37;
TIM_SetCompare1(TIM1,led0pwmval);
delay_ms(1000);
delay_ms(10000);
led0pwmval=160;
TIM_SetCompare1(TIM1,led0pwmval);
delay_ms(10000);
}
}
--------------------------------------------------------------
pwm.h
#ifndef __PWM_H
#define __PWM_H
#include "sys.h"
void TIM1_PWM_Init(u16 arr,u16 psc);
#endif
---------------------------------------------------------------
pwm.c
#include "pwm.h"
#include "led.h"
#include "delay.h"
void TIM1_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStruct;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);//使能定时器时钟1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);//使能GPIO外设
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //PA.8 端口配置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //io口速度50MHz
GPIO_Init(GPIOA, &GPIO_InitStructure); //根据参数初始化GPIOA.8
//定时器1初始化
TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动装载寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置作为时钟频率除数的分频值
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据指定的参数初始化TIM
//初始化输出比较参数
TIM_OCInitStruct.TIM_OCMode=TIM_OCMode_PWM2;
TIM_OCInitStruct.TIM_OutputState=TIM_OutputState_Enable;
TIM_OCInitStruct.TIM_Pulse = 200;
TIM_OCInitStruct.TIM_OCPolarity=TIM_OCPolarity_Low;
TIM_OC1Init(TIM1,&TIM_OCInitStruct);
TIM_CtrlPWMOutputs(TIM1,ENABLE); //主输出使能
//使能输出比较预装载值
TIM_OC1PreloadConfig(TIM1,TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM1, ENABLE);
//使能定时器
TIM_Cmd(TIM1,ENABLE);
}
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