time.c文件
- //通用定时器中断初始化
- //这里时钟选择为APB1的2倍，而APB1为36M
- //arr：自动重装值。
- //psc：时钟预分频数
- //这里使用的是定时器3!
- void TIM3_Int_Init(u16 arr,u16 psc)
- {
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //时钟使能
- 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
- 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
- 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(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
-
- TIM_ITConfig( //使能或者失能指定的TIM中断
- TIM3, //TIM2
- TIM_IT_Update | //TIM 中断源
- TIM_IT_Trigger, //TIM 触发中断源
- ENABLE //使能
- );
- NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM3中断
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占优先级0级
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //从优先级3级
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
- NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器
- TIM_Cmd(TIM3, ENABLE); //使能TIMx外设
-
- }
- void TIM3_IRQHandler(void) //TIM3中断
- {
- if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //检查指定的TIM中断发生与否:TIM 中断源
- {
- TIM_ClearITPendingBit(TIM3, TIM_IT_Update ); //清除TIMx的中断待处理位:TIM 中断源
- LED1=!LED1;
- }
- }
- //PWM输出初始化
- //arr：自动重装值
- //psc：时钟预分频数
- void TIM3_PWM_Init(u16 arr,u16 psc)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- TIM_OCInitTypeDef TIM_OCInitStructure;
-
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外设和AFIO复用功能模块时钟使能
-
- GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); //Timer3部分重映射 TIM3_CH2->PB5 //用于TIM3的CH2输出的PWM通过该LED显示
-
- //设置该引脚为复用输出功能,输出TIM3 CH2的PWM脉冲波形
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //TIM_CH2
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOB, &GPIO_InitStructure);
- //GPIO_WriteBit(GPIOA, GPIO_Pin_7,Bit_SET); // PA7上拉
- 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 80K
- TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值 不分频
- 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(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
-
-
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
- TIM_OCInitStructure.TIM_Pulse = 0; //设置待装入捕获比较寄存器的脉冲值
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
- TIM_OC2Init(TIM3, &TIM_OCInitStructure); //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
- TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable); //使能TIMx在CCR2上的预装载寄存器
-
- TIM_ARRPreloadConfig(TIM3, ENABLE); //使能TIMx在ARR上的预装载寄存器
-
-
- TIM_Cmd(TIM3, ENABLE); //使能TIMx外设
-
- }
- //定时器5通道1输入捕获配置
- TIM_ICInitTypeDef TIM5_ICInitStructure;
- void TIM5_Cap_Init(u16 arr,u16 psc)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); //使能TIM5时钟
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能GPIOA时钟
-
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //PA0 清除之前设置
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PA0 输入
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- GPIO_ResetBits(GPIOA,GPIO_Pin_0); //PA0 下拉
-
- //初始化定时器5 TIM5
- TIM_TimeBaseStructure.TIM_Period = arr; //设定计数器自动重装值
- TIM_TimeBaseStructure.TIM_Prescaler =psc; //预分频器
- TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //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(TIM5, &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TIM5输入捕获参数
- TIM5_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01 选择输入端 IC1映射到TI1上
- TIM5_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获
- TIM5_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
- TIM5_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置输入分频,不分频
- TIM5_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置输入滤波器 不滤波
- TIM_ICInit(TIM5, &TIM5_ICInitStructure);
-
- //中断分组初始化
- NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn; //TIM3中断
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //先占优先级2级
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //从优先级0级
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
- NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器
-
- TIM_ITConfig(TIM5,TIM_IT_Update|TIM_IT_CC1,ENABLE);//允许更新中断 ,允许CC1IE捕获中断
-
- TIM_Cmd(TIM5,ENABLE ); //使能定时器5
-
- }
- u8 TIM5CH1_CAPTURE_STA=0; //输入捕获状态（捕獲完成標誌位bit7）
- u16 TIM5CH1_CAPTURE_VAL; //输入捕获值
-
- //定时器5中断服务程序
- void TIM5_IRQHandler(void)
- {
- if((TIM5CH1_CAPTURE_STA&0X80)==0)//还未成功捕获
- {
- if (TIM_GetITStatus(TIM5, TIM_IT_Update) != RESET)
-
- {
- if(TIM5CH1_CAPTURE_STA&0X40)//已经捕获到高电平了
- {
- if((TIM5CH1_CAPTURE_STA&0X3F)==0X3F)//高电平太长了
- {
- TIM5CH1_CAPTURE_STA|=0X80;//标记成功捕获了一次
- TIM5CH1_CAPTURE_VAL=0XFFFF;
- }else TIM5CH1_CAPTURE_STA++;
- }
- }
- if (TIM_GetITStatus(TIM5, TIM_IT_CC1) != RESET)//捕获1发生捕获事件
- {
- if(TIM5CH1_CAPTURE_STA&0X40) //捕获到一个下降沿
- {
- TIM5CH1_CAPTURE_STA|=0X80; //标记成功捕获到一次高电平脉宽
- TIM5CH1_CAPTURE_VAL=TIM_GetCapture1(TIM5);
- TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Rising); //CC1P=0 设置为上升沿捕获
- }else //还未开始,第一次捕获上升沿
- {
- TIM5CH1_CAPTURE_STA=0; //清空
- TIM5CH1_CAPTURE_VAL=0;
- TIM_SetCounter(TIM5,0);
- TIM5CH1_CAPTURE_STA|=0X40; //标记捕获到了上升沿
- TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling); //CC1P=1 设置为下降沿捕获
- }
- }
- }
-
- TIM_ClearITPendingBit(TIM5, TIM_IT_CC1|TIM_IT_Update); //清除中断标志位
-
- }
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