你需要設置你的計時器作爲PWM輸入,而不是捕捉輸入(TIM1例如可以做到這一點)。這樣,使用2個通道(但只有一個物理連接)。基本上,第一個頻道會給你的時間,第二個頻道會給你的脈搏。計數器會自動重置。
初始化函數:
void tim_init()
{
TIM_SlaveConfigTypeDef sSlaveConfig;
TIM_IC_InitTypeDef sConfigIC;
TIM_MasterConfigTypeDef sMasterConfig;
htim1.Instance = TIM1;
htim1.Init.Prescaler = 0;
htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
htim1.Init.Period = 65535;
htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim1.Init.RepetitionCounter = 0;
HAL_TIM_IC_Init(&htim1);
sSlaveConfig.SlaveMode = TIM_SLAVEMODE_RESET;
sSlaveConfig.InputTrigger = TIM_TS_TI2FP2;
sSlaveConfig.TriggerPolarity = TIM_INPUTCHANNELPOLARITY_RISING;
sSlaveConfig.TriggerPrescaler = TIM_ICPSC_DIV1;
sSlaveConfig.TriggerFilter = 0;
HAL_TIM_SlaveConfigSynchronization(&htim1, &sSlaveConfig);
sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_FALLING;
sConfigIC.ICSelection = TIM_ICSELECTION_INDIRECTTI;
sConfigIC.ICPrescaler = TIM_ICPSC_DIV1;
sConfigIC.ICFilter = 0;
HAL_TIM_IC_ConfigChannel(&htim1, &sConfigIC, TIM_CHANNEL_1);
sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_RISING;
sConfigIC.ICSelection = TIM_ICSELECTION_DIRECTTI;
HAL_TIM_IC_ConfigChannel(&htim1, &sConfigIC, TIM_CHANNEL_2);
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig);
//Enable interrupt
HAL_TIM_IC_Start_IT(&htim1, TIM_CHANNEL_2);
HAL_TIM_IC_Start(&htim1, TIM_CHANNEL_1);
}
和中斷處理程序
void tim_irq()
{
period = HAL_TIM_ReadCapturedValue(&htim1, TIM_CHANNEL_2);
pulse = HAL_TIM_ReadCapturedValue(&htim1, TIM_CHANNEL_1);
//First irq to be ignored
}
如果您的硬件中有計數器,請按固定間隔監視其計數。 – linuxfan