wiz550的测试及其控制代码，适合需要上位机与嵌入式系统的控制输出，批量传输、中断模式应用，(The test and control code of wiz550 is suitable for the control output of the host computer and the embedded system, the batch transmission and the interrupt mode application.)

通过调节载波频率可使外差法产生的差频在零频率点附近变动，从而使得双稳系统的输出信号发生特征极为明显的变化，为频率检测提供可靠的检测依据。(By adjusting the carrier frequency, the difference frequency produced by the heterodyne can be changed near the zero frequency point, which makes the output signal of the bistable s