timer.c- #include "timer.h"
- #include "led.h"
- #include "usart.h"
- #include "sys.h"
- //PWM输出初始化
- //arr：自动重装值
- //psc：时钟预分频数
- void TIM1_PWM_Init(u16 arr,u16 psc)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- TIM_OCInitTypeDef TIM_OCInitStructure;
-
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);//
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE); //使能GPIO外设时钟使能
-
-
- //设置该引脚为复用输出功能,输出TIM1 CH2的PWM脉冲波形
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //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(GPIOA, &GPIO_InitStructure);
-
-
- 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(TIM1, &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_OC1Init(TIM1, &TIM_OCInitStructure); //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
-
- TIM_CtrlPWMOutputs(TIM1,ENABLE); //MOE 主输出使能
-
- TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); //CH1预装载使能
-
- TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器
-
- TIM_Cmd(TIM1, ENABLE); //使能TIM1
-
-
- }
-
- //定时器2通道1输入捕获配置
-
- TIM_ICInitTypeDef TIM2_ICInitStructure;
-
- void TIM2_Cap_Init(u16 arr,u16 psc)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
-
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //使能TIM2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2 TIM2
- 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(TIM2, &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TIM2输入捕获参数
- TIM2_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01 选择输入端 IC1映射到TI1上
- TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获
- TIM2_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
- TIM2_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置输入分频,不分频
- TIM2_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置输入滤波器 不滤波
- TIM_ICInit(TIM2, &TIM2_ICInitStructure);
-
- //中断分组初始化
- NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn; //TIM2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(TIM2,TIM_IT_Update|TIM_IT_CC1,ENABLE);//允许更新中断 ,允许CC1IE捕获中断
-
- TIM_Cmd(TIM2,ENABLE ); //使能定时器2
-
- }
-
-
- u8 TIM2CH1_CAPTURE_STA=0; //输入捕获状态
- u16 TIM2CH1_CAPTURE_VAL; //输入捕获值
-
- //定时器5中断服务程序
- void TIM2_IRQHandler(void)
- {
-
- if((TIM2CH1_CAPTURE_STA&0X80)==0)//还未成功捕获
- {
- if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
-
- {
- if(TIM2CH1_CAPTURE_STA&0X40)//已经捕获到高电平了
- {
- if((TIM2CH1_CAPTURE_STA&0X3F)==0X3F)//高电平太长了
- {
- TIM2CH1_CAPTURE_STA|=0X80;//标记成功捕获了一次
- TIM2CH1_CAPTURE_VAL=0XFFFF;
- }else TIM2CH1_CAPTURE_STA++;
- }
- }
- if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)//捕获1发生捕获事件
- {
- if(TIM2CH1_CAPTURE_STA&0X40) //捕获到一个下降沿
- {
- TIM2CH1_CAPTURE_STA|=0X80; //标记成功捕获到一次上升沿
- TIM2CH1_CAPTURE_VAL=TIM_GetCapture1(TIM2);
- TIM_OC1PolarityConfig(TIM2,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
- {
- TIM2CH1_CAPTURE_STA=0; //清空
- TIM2CH1_CAPTURE_VAL=0;
- TIM_SetCounter(TIM2,0);
- TIM2CH1_CAPTURE_STA|=0X40; //标记捕获到了上升沿
- TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Falling); //CC1P=1 设置为下降沿捕获
- }
- }
- }
-
- TIM_ClearITPendingBit(TIM2, TIM_IT_CC1|TIM_IT_Update); //清除中断标志位
-
- }
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