stm32测频（输入捕获）程序
频率计 1khz-6mhz
单片机源程序如下:
- #include "counter.h"
- #include "stdio.h"
- #include "usart.h"
- /***********************************************************************************************
- //上升沿捕获
- ************************************************************************************************/
- TIM_ICInitTypeDef TIM3_ICInitStructure;
- void TIM3_counter_Init(u16 arr,u16 psc)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能TIM5时钟
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能GPIOA时钟
-
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //PA7 清除之前设置
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //PA7 浮空输入
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- GPIO_ResetBits(GPIOA,GPIO_Pin_7); //PA7 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(TIM3, &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
- TIM3_ICInitStructure.TIM_Channel = TIM_Channel_2; // 选择输入端 IC1映射到TI1上
- TIM3_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕获
- TIM3_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
- TIM3_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置输入分频,不分频
- TIM3_ICInitStructure.TIM_ICFilter = 0x00; //IC1F=0000 配置输入滤波器 不滤波
- TIM_ICInit(TIM3, &TIM3_ICInitStructure);
- TIM_SelectInputTrigger(TIM3, TIM_TS_TI2FP2); //选择IC2为始终触发源
- TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);//TIM从模式：触发信号的上升沿重新初始化计数器和触发寄存器的更新事件
- TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable); //启动定时器的被动触发
-
- //中断分组初始化
- NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM3中断
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //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(TIM3,TIM_IT_CC2,ENABLE);//不能允许更新中断 ,允许CC2IE捕获中断
-
- TIM_Cmd(TIM3,ENABLE); //使能定时器3
-
- }
- /***********************************************************************************************
- ************************************************************************************************/
- u32 counter=0; // 每秒计数
- u32 Frequency=0;
- void TIM3_IRQHandler(void)
- {
- if (TIM_GetITStatus(TIM3, TIM_IT_CC2) == SET)
-
- {
- ……………………
- …………限于本文篇幅 余下代码请从51黑下载附件…………
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频率计(输入捕获模式).rar
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