输入捕获脉冲怎么使用

rt_err_t rt_device_inputcapture_register(struct rt_inputcapture_device *inputcapture, const char *name, void *user_data)；
/**
 * This function is ISR for inputcapture interrupt.
 * level: RT_TRUE denotes high level pulse, and RT_FALSE denotes low level pulse.
 */
void rt_hw_inputcapture_isr(struct rt_inputcapture_device *inputcapture, rt_bool_t level);