最重要的下載程式的option bety 設定；
函式1：
void Init_Timer1(void) { GPIO_Init(GPIOC, GPIO_PIN_6, GPIO_MODE_IN_PU_NO_IT); //輸入浮動，沒有外部中斷 TIM1_DeInit(); //tim1 定時器暫存器全部復位 TIM1_TimeBaseInit(31, TIM1_COUNTERMODE_UP, 15625-1, 0);// 500ms 最小捕獲5hz 設定時間分頻 向上計數 捕捉5Hz及 以上的週期和佔空比 TIM1_PWMIConfig(TIM1_CHANNEL_1, TIM1_ICPOLARITY_RISING, TIM1_ICSELECTION_DIRECTTI, TIM1_ICPSC_DIV1, 0x00); //選擇TI1輸入上升沿觸發 選擇TI2輸入下降沿觸發 輸入捕捉預定標器 無濾波 TIM1_SelectInputTrigger(TIM1_TS_TI1FP1); //濾波後輸入TI1 TIM1_SelectSlaveMode(TIM1_SLAVEMODE_RESET); //復位輸入 TIM1_ClearFlag(TIM1_FLAG_CC1); //指定要清除的標誌 TIM1_ClearFlag(TIM1_FLAG_CC2); //指定要清除的標誌 TIM1_ITConfig( TIM1_IT_CC1, ENABLE); //去掉是查詢方式，否則是中斷方式 TIM1_ITConfig( TIM1_IT_CC2, ENABLE); //去掉是查詢方式，否則是中斷方式 TIM1_CCxCmd(TIM1_CHANNEL_1, ENABLE); //使能輸入捕獲通道1 TIM1_CCxCmd(TIM1_CHANNEL_2, ENABLE); //使能輸入捕獲通道2 TIM1_Cmd(ENABLE); //使能定時器 }
函式2：
extern __IO uint32_t LSIClockFreq; extern __IO uint32_t LSIDuty; INTERRUPT_HANDLER(TIM1_CAP_COM_IRQHandler, 12) { /* In order to detect unexpected events during development, it is recommended to set a breakpoint on the following instruction. */ uint16_t num = 0; static uint16_t num1; static uint32_t num2; if(TIM1_GetITStatus(TIM1_IT_CC1) != RESET) //如果CH1邊沿觸 { num1 = TIM1_GetCapture1(); TIM1_ClearITPendingBit(TIM1_IT_CC1); //清除標誌位 } else if(TIM1_GetITStatus(TIM1_IT_CC2) != RESET) //如果CH2邊沿觸發 { num2 = TIM1_GetCapture2(); // TIM1_ClearITPendingBit(TIM1_IT_CC2); //清除標誌位 if(flag_send==0) { LSIDuty = ((num2 * 100) / num1); //計算佔空比 SIClockFreq = 62500/( num1); //計算頻率 if(LSIClockFreq>=0xff) { LSIClockFreq=0xff; } } } }