STM32F103ZET6【标准库函数开发】------05.通用定时器TIM5四个通道输出PWM信号

STM32有四个通用定时器，现在介绍TIM5输出4路PWM的方法

下面展示主要的time.c、main.c函数的代码

#include "timer.h"
void TIM5_PWM_Init(u16 arr,u16 psc)
{  
	GPIO_InitTypeDef GPIO_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	TIM_OCInitTypeDef  TIM_OCInitStructure;
	
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);//使能定时器4时钟
 	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  //使能GPIO外设和AFIO复用功能模块时钟	
//GPIO配置	
	GPIO_InitStructure.GPIO_Pin =GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3; 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; 
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
//初始化TIM2
	TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
	TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值 
	TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
	TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
	
//配置TIM2的PWM
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式2
 	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
//CH1	
	TIM_OC1Init(TIM5, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM3 OC2
	TIM_OC1PreloadConfig(TIM5, TIM_OCPreload_Enable);  //使能TIM3在CCR2上的预装载寄存器
//CH12
	TIM_OC2Init(TIM5, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM3 OC2
	TIM_OC2PreloadConfig(TIM5, TIM_OCPreload_Enable);  //使能TIM3在CCR2上的预装载寄存器
//CH13
	TIM_OC3Init(TIM5, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM3 OC2
	TIM_OC3PreloadConfig(TIM5, TIM_OCPreload_Enable);  //使能TIM3在CCR2上的预装载寄存器
//CH14
	TIM_OC4Init(TIM5, &TIM_OCInitStructure);  //根据T指定的参数初始化外设TIM3 OC2
	TIM_OC4PreloadConfig(TIM5, TIM_OCPreload_Enable);  //使能TIM3在CCR2上的预装载寄存器
	
	TIM_Cmd(TIM5, ENABLE);  //使能TIM4
}

#include "timer.h"
 
 int main(void)
 {		
	delay_init();	    	 //延时函数初始化	  
	TIM5_PWM_Init(999,71);	 //不分频。PWM频率=72000000/1000/72=1Khz   周期为1ms
	 while(1)
	{					
		TIM_SetCompare1(TIM5,200);	  //占空比20%
		TIM_SetCompare2(TIM5,300);	  //占空比30%
		TIM_SetCompare3(TIM5,400);	  //占空比40%
		TIM_SetCompare4(TIM5,500);	  //占空比50%		
	}
 }