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1、STM32f103 定时器输出PWM波控制LED输出呼吸灯（根据正点原子程序）定时器部分：time.c 与time.hTime.h函数#ifndef _TIME_H#define _TIME_Hvoid TIME_PWM_Init(u16 arr,u16 psc);#endifTime.c 函数#include time.h/ 定时器输出PWM波，控制LED（PD12），重映射到TIME4_CHI/*/void TIME_PWM_Init(u16 arr,u16 psc) GPIO_InitTypeDef GPIO_InitStructure;TIM_TimeBaseInitTypeDef T
2、IM_TimeBaseInitStructure;TIM_OCInitTypeDef TIM_OCInitStructure;RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE); /RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO,ENABLE);/GPIO_PinRemapConfig(GPIO_Remap_TIM4,ENABLE); /重映射TIM4使能GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;GPIO_InitSt
3、ructure.GPIO_Pin=GPIO_Pin_12;GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;GPIO_Init(GPIOD,&GPIO_InitStructure); / 初始化GPIO口为复用推完输出/ 初始化TIM4TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up;/向上计数TIM_TimeBaseInitStructure.TIM_Period=arr; /TIM_TimeBaseInitStructure.TIM_Prescaler=psc;/预分频系数
4、TIM_TimeBaseInitStructure.TIM_ClockDivision = 0;TIM_TimeBaseInit(TIM4,&TIM_TimeBaseInitStructure); / 初始化TIM4_CHIpwm模式TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1; TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;/ 极性选择TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;/ TIM_OC1Init(T
5、IM4,&TIM_OCInitStructure); /TIM_OC1PreloadConfig(TIM4,TIM_OCPreload_Enable); / 使能TIM4在ccr1上的预装载寄存器TIM_Cmd(TIM4,ENABLE); /使能TIM4Main函数#include stm32f10x.h#include led.h#include delay.h#include time.hint main(void)u16 led0pwmval=0;u8 dir=1; delay_init();TIME_PWM_Init(899,0); / 不分频 产生一个pwm频率为72MHz/900=80KHzwhile(1) delay_ms(1); if(dir) led0pwmval+; else led0pwmval-;if(led0pwmval600) dir=0; if(led0pwmval=0) dir=1;TIM4-CCR1=led0pwmval;
