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還有一點問題就是最大測17cm,后面就顯示不出，希望大神們指導下，我是個小白
- #include "timer.h"
- #include "led.h"
- #include "usart.h"
- #include "delay.h"
- //通用定時器中斷初始化
- //這里時鐘選擇為APB1的2倍，而APB1為36M
- //arr：自動重裝值。
- //psc：時鐘預分頻數
- //定時器5通道1輸入捕獲配置
- 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時鐘
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能GPIOA時鐘
-
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //PA0 清除之前設置
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PA0 輸入
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- GPIO_ResetBits(GPIOA,GPIO_Pin_0); //PA0 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(TIM5, &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
- TIM5_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01 選擇輸入端 IC1映射到TI1上
- TIM5_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕獲
- TIM5_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
- TIM5_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置輸入分頻,不分頻
- TIM5_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置輸入濾波器 不濾波
- TIM_ICInit(TIM5, &TIM5_ICInitStructure);
-
- //中斷分組初始化
- NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn; //TIM5中斷
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //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(TIM5,TIM_IT_Update|TIM_IT_CC1,ENABLE);//允許更新中斷 ,允許CC1IE捕獲中斷
-
- TIM_Cmd(TIM5,ENABLE ); //使能定時器5
-
- }
- u8 TIM5CH1_CAPTURE_STA=0; //輸入捕獲狀態
- u16 TIM5CH1_CAPTURE_VAL; //輸入捕獲值
- //定時器5中斷服務程序
- void TIM5_IRQHandler(void)
- {
- if(TIM_GetITStatus(TIM5, TIM_IT_CC1) != RESET)
- {
- if(TIM5CH1_CAPTURE_STA==1)
- {
- TIM5CH1_CAPTURE_VAL=TIM_GetCapture1(TIM5);
- printf("探測距離為：%.2f cm\r\n",TIM5CH1_CAPTURE_VAL*17/1000.0);
- TIM5CH1_CAPTURE_STA=0;
- TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Rising); //CC1P=0 設置為上升沿捕獲
- }
- else
- {
- TIM5CH1_CAPTURE_VAL = 0;
- TIM5CH1_CAPTURE_STA =1;
- TIM_SetCounter(TIM5,0);
- TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling); //CC1P=1 設置為下降沿捕獲
- TIM_Cmd(TIM5,ENABLE);
- }
- }
- TIM_ClearITPendingBit(TIM5, TIM_IT_CC1|TIM_IT_Update); //清除中斷標志位
-
- }
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超聲波模塊完成.7z
2020-10-10 14:40 上傳
點擊文件名下載附件
189.53 KB, 下載次數: 24
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