婷婷五月五天丁香6月,久久亭亭五月综合

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#include "timer.h"
#include "led.h"
#include "usart.h"
#include "delay.h"
//TIM3 PWM部分初始化
//PWM輸出初始化
//arr：自動重裝值
//psc：時(shí)鐘預(yù)分頻數(shù)
void TIM2_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能定時(shí)器3時(shí)鐘
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外設(shè)和AFIO復(fù)用功能模塊時(shí)鐘
//GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); //Timer3部分重映射 TIM3_CH2->PB5
//設(shè)置該引腳為復(fù)用輸出功能,輸出TIM3 CH2的PWM脈沖波形 GPIOA.1
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; //TIM_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復(fù)用推挽輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIO
//初始化TIM3
TIM_TimeBaseStructure.TIM_Period = arr; //設(shè)置在下一個更新事件裝入活動的自動重裝載寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //設(shè)置用來作為TIMx時(shí)鐘頻率除數(shù)的預(yù)分頻值
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設(shè)置時(shí)鐘分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計(jì)數(shù)模式
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //根據(jù)TIM_TimeBaseInitStruct中指定的參數(shù)初始化TIMx的時(shí)間基數(shù)單位
//初始化TIM3 Channel2 PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //選擇定時(shí)器模式:TIM脈沖寬度調(diào)制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比較輸出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low ; //輸出極性:TIM輸出比較極性高
TIM_OC2Init(TIM2, &TIM_OCInitStructure); //根據(jù)T指定的參數(shù)初始化外設(shè)TIM3 OC2
TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable); //使能TIM3在CCR2上的預(yù)裝載寄存器
TIM_Cmd(TIM2, DISABLE);
}
void TIM4_Init(unsigned short int arr, unsigned short int psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure; /*定義一個設(shè)置定時(shí)器的變量*/
NVIC_InitTypeDef NVIC_InitStructure; /*定義一個設(shè)置中斷的變量*/
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); /*設(shè)置中斷向量分組：第2組搶先優(yōu)先級：0 1 2 3 子優(yōu)先級：0 1 2 3*/
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE); /*使能TIM4時(shí)鐘*/
TIM_TimeBaseInitStructure.TIM_Period = arr; /*設(shè)置自動重裝載值*/
TIM_TimeBaseInitStructure.TIM_Prescaler=psc; /*設(shè)置定時(shí)器預(yù)分頻數(shù)*/
TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up; /*向上計(jì)數(shù)模式*/
TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1; /*1分頻*/
TIM_TimeBaseInit(TIM4,&TIM_TimeBaseInitStructure); /*設(shè)置TIM4*/
TIM_ClearITPendingBit(TIM4,TIM_IT_Update); /*清除溢出中斷標(biāo)志位*/
TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE); /*使能TIM4溢出中斷*/
NVIC_InitStructure.NVIC_IRQChannel=TIM4_IRQn; /*設(shè)置TIM4中斷*/
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1; /*搶占優(yōu)先級1*/
NVIC_InitStructure.NVIC_IRQChannelSubPriority=1; /*子優(yōu)先級0*/
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE; /*中斷通道使能*/
NVIC_Init(&NVIC_InitStructure); /*設(shè)置中斷*/
TIM_Cmd(TIM4,ENABLE);
}
void TIM4_IRQHandler(void)
{
if(TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET) /*如果TIM_IT_Update置位，表示TIM4溢出中斷，進(jìn)入if*/
{
TIM_Cmd(TIM2, ENABLE);
delay_us(8);
TIM_Cmd(TIM2, DISABLE);
TIM_ClearITPendingBit(TIM4, TIM_IT_Update); /*清除TIM4溢出中斷標(biāo)志*/
}
}

復(fù)制代碼

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