STM32F10X頻率計，分享給大家，已調試通過，好使，低頻無誤差，高頻有些誤差。
單片機源程序如下:
- #include "counter.h"
- #include "stdio.h"
- #include "usart.h"
- #include "delay.h"
- /***********************************************************************************************
- //上升沿捕獲
- ************************************************************************************************/
- 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時鐘
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能GPIOA時鐘
-
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //PA7 清除之前設置
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //PA7 浮空輸入
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- GPIO_ResetBits(GPIOA,GPIO_Pin_7); //PA7 下拉
-
- //初始化定時器5 TIM5
- TIM_TimeBaseStructure.TIM_Period = arr; //設定計數器自動重裝值
- TIM_TimeBaseStructure.TIM_Prescaler =psc; //預分頻器
- TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //設置時鐘分割:TDTS = Tck_tim
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計數模式
- TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根據TIM_TimeBaseInitStruct中指定的參數初始化TIMx的時間基數單位
-
- //初始化TIM5輸入捕獲參數
- TIM3_ICInitStructure.TIM_Channel = TIM_Channel_2; // 選擇輸入端 IC1映射到TI1上
- TIM3_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕獲
- TIM3_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
- TIM3_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置輸入分頻,不分頻
- TIM3_ICInitStructure.TIM_ICFilter = 0x00; //IC1F=0000 配置輸入濾波器 不濾波
- TIM_ICInit(TIM3, &TIM3_ICInitStructure);
- TIM_SelectInputTrigger(TIM3, TIM_TS_TI2FP2); //選擇IC2為始終觸發源
- TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);//TIM從模式：觸發信號的上升沿重新初始化計數器和觸發寄存器的更新事件
- TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable); //啟動定時器的被動觸發
-
- //中斷分組初始化
- NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM3中斷
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占優先級2級
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //從優先級0級
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
- NVIC_Init(&NVIC_InitStructure); //根據NVIC_InitStruct中指定的參數初始化外設NVIC寄存器
-
- TIM_ITConfig(TIM3,TIM_IT_CC2,ENABLE);//不能允許更新中斷 ,允許CC2IE捕獲中斷
-
- TIM_Cmd(TIM3,ENABLE); //使能定時器3
-
- }
- /***********************************************************************************************
- ************************************************************************************************/
- u32 counter=0; // 每秒計數
- int Frequency=0;
- void TIM3_IRQHandler(void)
- {
- static int i =0;
- if (TIM_GetITStatus(TIM3, TIM_IT_CC2) == SET)
- {
- TIM_ClearITPendingBit(TIM3, TIM_IT_CC2); //清楚TIM的中斷待處理位
- counter = (u32)TIM_GetCapture2(TIM3);
- Frequency =72000000/counter;
- printf("當前頻率為:%d Hz\r\n",Frequency/7200); //打印數據
- for(i=0;i<2000000;i++)
- {
- ;
- }
-
- }
- }
所有資料51hei提供下載:
15、頻率計(輸入捕獲模式).rar
(285.86 KB, 下載次數: 312)
2018-7-12 00:23 上傳
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STM32頻率計
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