#include "pwm.h"

void TIM2_PWM_Init(void)
{
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);   //使能TIM2时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  //使能GPIOA时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);  //使能GPIOA时钟
	
	
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
	GPIO_InitStructure.GPIO_Pin =GPIO_Pin_14;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOC, &GPIO_InitStructure);
	
	
	//配置PA1，PA2为复用输出模式，输出速度为50MHZ
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_InitStructure.GPIO_Pin =GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	//开启TIM2内部时钟
	TIM_InternalClockConfig(TIM2);
	//配置TIM2
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
	TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;  //时钟分频
	TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up; //计数方式向上计数
	TIM_TimeBaseInitStructure.TIM_Period = 1440 - 1;		//ARR 自动重装载值
	TIM_TimeBaseInitStructure.TIM_Prescaler = 1 - 1;		//PSC 预分频器 
	TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;    //
	TIM_TimeBaseInit(TIM2,&TIM_TimeBaseInitStructure);
	//输出通道配置
	TIM_OCInitTypeDef TIM_OCInitStructure;
	TIM_OCStructInit(&TIM_OCInitStructure);
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;//配置PWM模式1
	TIM_OCInitStructure.TIM_OCPolarity =  TIM_OCPolarity_High;//有效极性为高电平
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
	TIM_OCInitStructure.TIM_Pulse = 0;		//CCR
	TIM_OC1Init(TIM2, &TIM_OCInitStructure);  //初始化通道1  PA0 
	TIM_OC2Init(TIM2, &TIM_OCInitStructure);  //初始化通道2  PA1 
	TIM_OC3Init(TIM2, &TIM_OCInitStructure);  //初始化通道3  PA2
	
	TIM_Cmd(TIM2, ENABLE);  //使能定时器2
}

void TIM4_1ms_Init(void)  //(u16 arr,u16 psc)
{
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);
	
	NVIC_InitStructure.NVIC_IRQChannel=TIM4_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
	NVIC_Init(&NVIC_InitStructure); 
	
	TIM_TimeBaseInitStructure.TIM_Period = 1000-1;      //1ms
	TIM_TimeBaseInitStructure.TIM_Prescaler= 72-1;       //72分频=1MHz
	TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up;
	TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1;
	TIM_TimeBaseInit(TIM4,&TIM_TimeBaseInitStructure);
	TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE);
	TIM_Cmd(TIM4,ENABLE);
}


uint32_t time1_cntr;
uint32_t time2_cntr;
//定时器中断服务函数
void TIM4_IRQHandler(void)
{
	if(TIM_GetITStatus(TIM4,TIM_IT_Update)==SET) //溢出中断
	{
		time1_cntr++;
		time2_cntr++;
	}
	TIM_ClearITPendingBit(TIM4,TIM_IT_Update); //清除中断标志位
}