user4232779 说：

gpioGenPulseTrain cfg.pulseCount这个参数是用来存放读取的脉冲个数么？

它是产生脉冲的长度

gpioGenPulseTrain
Prototype: gpioGenPulseTrain(#auxio, #polarity, #activeDuration, #inactiveDuration, count)

Generates a pulse train with specified polarity and active/inactive duration on the specified AUX I/O pin.

Parameter value(s)
#auxio - The GPIO pin to be pulsed (index of AUX I/O pin)
#polarity - The value of the pulse (1 = high, 0 = low) during the active phase
#activeDuration - Duration of the active phase, in number of 12 MHz periods (1 to 256)
#inactiveDuration - Duration of the inactive phase, in number of 12 MHz periods (3 to 256)
count - Length of the pulse train in number of pulses (1 to 65535)

user4232779 说：

那么pcntGetValue(output.measuredPulseCount);这句的作用是什么？

获取脉冲串中的脉冲数

user4232779 说：

AUXIO_O_PULSE_OUTPUT这个参数有事什么意思？输入的脉冲数并没有牵扯到任何输出引脚啊？

这在注释中有说明，最后又到输入

// Generate a pulse train on AUXIO_O_PULSE_OUTPUT, which is looped back
// to AUXIO_I_PULSE_CNT_INPUT
gpioGenPulseTrain(AUXIO_O_PULSE_OUTPUT, 0, 24, 24, cfg.pulseCount);

脉冲计数器一次只能在一个输入引脚上使用，sensor Controller 只是一个协处理器，资源没有那么多