142 lines
4.7 KiB
C
142 lines
4.7 KiB
C
#include "Tim.h"
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#include "Led.h"
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#include "Key.h"
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u8 leddat = 3;
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/**-------------------------------------------------------
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* @函数名 TIM2_INIT
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* @功能 通用定时器2中断初始化
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* @参数 arr：自动重装值。psc：时钟预分频数
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* @返回值 无
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***------------------------------------------------------*/
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void TIM2_INIT(u16 arr,u16 psc)
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{
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TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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NVIC_InitTypeDef NVIC_InitStructure;
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //时钟使能
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//定时器TIM2初始化
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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
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TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值
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TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
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TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
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TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //根据指定的参数初始化TIMx的时间基数单位
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TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE ); //使能指定的TIM2中断,允许更新中断
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//中断优先级NVIC设置
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NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; //TIM2中断
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占优先级0级
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //从优先级3级
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
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NVIC_Init(&NVIC_InitStructure); //初始化NVIC寄存器
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TIM_Cmd(TIM2, ENABLE); //使能TIMx
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}
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/**-------------------------------------------------------
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* @函数名 TIM2_IRQHandler
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* @功能 定时器2中断服务程序
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* @返回值 无
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***------------------------------------------------------*/
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void TIM2_IRQHandler(void) //TIM2中断
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{
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if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) //检查TIM2更新中断发生与否
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{
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TIM_ClearITPendingBit(TIM2, TIM_IT_Update ); //清除TIMx更新中断标志
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if(flag){
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//LED_OFF();
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LED_ON(leddat<3?++leddat:(leddat=0));
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}else{
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LED_ON(leddat>0?--leddat:(leddat=3));
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}
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}
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}
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/**-------------------------------------------------------
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* @函数名 TIM3_PWM_INIT
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* @功能 TIM3 PWM部分初始化
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* @参数 arr：自动重装值。psc：时钟预分频数
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* @返回值 无
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***------------------------------------------------------*/
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void TIM3_PWM_INIT(u16 arr,u16 psc)
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{
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// 开启定时器时钟,即内部时钟CK_INT=72M
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
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GPIO_InitTypeDef GPIO_InitStructure;
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/* 使能时钟 */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能对应端口时钟
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/*---------------------GPIO_A7初始化 START----------------------------------------*/
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/* 初始化LED的GPIO管脚，配置为推挽输出 */ //设置端口
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //LED灯对应的GPIO_Pin_0
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //最大输出速度为50MHz
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GPIO_Init(GPIOA, &GPIO_InitStructure); //调用GPIO初始化函数
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/*---------------------GPIO_A15初始化 END----------------------------------------*/
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/*--------------------时基结构体初始化-------------------------*/
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// 配置周期，这里配置为100K
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TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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// 自动重装载寄存器的值，累计TIM_Period+1个频率后产生一个更新或者中断
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TIM_TimeBaseStructure.TIM_Period=arr;
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// 驱动CNT计数器的时钟 = Fck_int/(psc+1)
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TIM_TimeBaseStructure.TIM_Prescaler= psc;
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// 时钟分频因子 ，配置死区时间时需要用到
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TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
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// 计数器计数模式，设置为向上计数
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TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
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// 重复计数器的值，没用到不用管
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TIM_TimeBaseStructure.TIM_RepetitionCounter=0;
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// 初始化定时器
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TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
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/*--------------------输出比较结构体初始化-------------------*/
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// 占空比配置
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uint16_t CCR2_Val = 4;
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TIM_OCInitTypeDef TIM_OCInitStructure;
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// 配置为PWM模式1
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TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
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// 输出使能
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TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
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// 输出通道电平极性配置
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TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
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// 输出比较通道 2
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TIM_OCInitStructure.TIM_Pulse = CCR2_Val;
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TIM_OC2Init(TIM3, &TIM_OCInitStructure);
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TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);
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// 使能计数器
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TIM_Cmd(TIM3, ENABLE);
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}
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