#include "basic.h"


void TIM3_Configuration(void)
{
    //声明一个定时器结构体变量
    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructrue;
    //声明一个中断优先分组的结构体变量
    NVIC_InitTypeDef NVIC_InitStructure;
	//使能定时器3的外设时钟
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
    //设置定时器中断的优先分组
    NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01;   	//抢占优先级为1
    NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x03;          	//响应优先级为3
    TIM_TimeBaseInitStructrue.TIM_Period=99;     					//Tout=(ARR+1)(PSC+1)/Tclk   (999+1)(83+1)/(1*84M)
    TIM_TimeBaseInitStructrue.TIM_Prescaler=83;						//定时1ms
    TIM_TimeBaseInitStructrue.TIM_CounterMode=TIM_CounterMode_Up;
    TIM_TimeBaseInitStructrue.TIM_ClockDivision=TIM_CKD_DIV1;
    

    //初始化定时器3
    TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructrue);

    //设置优先级分组  为组2
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
    //初始化优先级分组
    NVIC_Init(&NVIC_InitStructure);
    //配置定时器的中断的中断源
    TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);
    //使能定时器3
    TIM_Cmd(TIM3,ENABLE);

}


//TIM4 PWM部分初始化 
//arr：自动重装值
//psc：时钟预分频数
void TIM4_PWM_Init(u16 arr,u16 arrtime)
{  
	//**结构体声明**//
	GPIO_InitTypeDef GPIO_InitStructure;            //声明GPIO
	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure; //声明定时器
	TIM_OCInitTypeDef  TIM_OCInitStructure;         //声明PWM通道
	
	//**时钟使能**//
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);	//使能定时器TIM4时钟
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
	
	//****//
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;				 //LED0-->PD15 端口配置
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;		 //IO口速度为50MHz
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
	GPIO_Init(GPIOD, &GPIO_InitStructure);					 //根据设定参数初始化GPIOD.15
	GPIO_ResetBits(GPIOD,GPIO_Pin_15);
	
	GPIO_PinAFConfig(GPIOD,GPIO_PinSource15,GPIO_AF_TIM4);
	
	//初始化TIM4
	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 =839; 					//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(TIM4, &TIM_TimeBaseStructure); 			//根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

	//初始化TIM4 Channe41 PWM模式	 
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; 				//选择定时器模式:TIM脉冲宽度调制模式1
 	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 	//比较输出使能
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; 		//输出极性:TIM输出比较极性高
	TIM_OCInitStructure.TIM_Pulse = arrtime;						//(arr+1)*0.15; //设置待装入捕获比较寄存器的脉冲值，高于脉冲值就会产生高电平
	TIM_OC4Init(TIM4, &TIM_OCInitStructure);  						//根据T指定的参数初始化外设TIM3 OC4
	
	TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);  				//使能TIM4_CH4预装载寄存器
	
	TIM_ARRPreloadConfig(TIM4, ENABLE);
   
	TIM_Cmd(TIM4, ENABLE);  //使能TIM4
}