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118 lines
4.7 KiB
118 lines
4.7 KiB
3 years ago
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#include "timer.h"
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#include "led.h"
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#include "usart.h"
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#include "led.h"
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extern struct UserInfo userInfo;
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//////////////////////////////////////////////////////////////////////////////////
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//本程序只供学习使用，未经作者许可，不得用于其它任何用途
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//ALIENTE精英STM32开发板
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//定时器 驱动代码
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//正点原子@ALIENTEK
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//技术论坛:www.openedv.com
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//修改日期:2012/9/4
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//版本：V1.1
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//版权所有，盗版必究。
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//Copyright(C) 广州市星翼电子科技有限公司 2009-2019
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//All rights reserved
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//********************************************************************************
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//V1.1 20120904
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//1,增加TIM3_PWM_Init函数。
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//2,增加LED0_PWM_VAL宏定义，控制TIM3_CH2脉宽
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//////////////////////////////////////////////////////////////////////////////////
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//通用定时器3中断初始化
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//这里时钟选择为APB1的2倍，而APB1为36M
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//arr：自动重装值。
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//psc：时钟预分频数
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//这里使用的是定时器3!
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void TIM3_Int_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_TIM3, ENABLE); //时钟使能
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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 计数到5000为500ms
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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 10Khz的计数频率
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TIM_TimeBaseStructure.TIM_ClockDivision = 0; //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(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
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TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //使能指定的TIM3中断,允许更新中断
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NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM3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 = 3; //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); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器
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TIM_Cmd(TIM3, ENABLE); //使能TIMx外设
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}
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//定时器3中断服务程序
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void TIM3_IRQHandler(void) //TIM3中断
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{
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static int num = 0, sec = 0;
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if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //检查指定的TIM中断发生与否:TIM 中断源
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{
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TIM_ClearITPendingBit(TIM3, TIM_IT_Update ); //清除TIMx的中断待处理位:TIM 中断源
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num++;
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if(num >= 2){
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num = 0;
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sec++;
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// 一分钟
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if(sec >= 60){
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sec = 0;
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if(userInfo.timerFlag) if(userInfo.timer > 0) userInfo.timer--;
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}
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}
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}
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}
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//TIM3 PWM部分初始化
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//PWM输出初始化
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//arr：自动重装值
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//psc：时钟预分频数
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void TIM3_PWM_Init(u16 arr,u16 psc)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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TIM_OCInitTypeDef TIM_OCInitStructure;
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能定时器3时钟
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外设和AFIO复用功能模块时钟
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GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); //Timer3部分重映射 TIM3_CH2->PB5
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//设置该引脚为复用输出功能,输出TIM3 CH2的PWM脉冲波形 GPIOB.5
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //TIM_CH2
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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;
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GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIO
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//初始化TIM3
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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 = 0; //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(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
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//初始化TIM3 Channel2 PWM模式
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TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
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TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
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TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
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TIM_OC2Init(TIM3, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM3 OC2
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TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable); //使能TIM3在CCR2上的预装载寄存器
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TIM_Cmd(TIM3, ENABLE); //使能TIM3
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}
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