1)产生三角波

   用EaSy HDL脚本编写一NCP3985SN30T1G个模拟三角波信号源，如图7-41所示（配套电子资源实例为chap7中的Triangle Wave. pdsprj）。

   图7-41  Easy HDL脚本实现三角波信号源

   Easy HDL脚本如下：

   REM TRIANGLE WAVE GENERATOR

   REM Define the Waveform Parameters

   FLOAT FREQ=100, AMP=2, SLOPE-1

   FLOAT PERIOD=1/FREQ,OFFSET=O

   REM Repeating event for positive slope

   ON TIMER AT PERIOD EVERY PERIOD

   OFFSET--EVTTIME

   SLOPE=1

   ENDON

   REM Repeating event for negative slope

   ON TIMER AT PERIOD/2 EVERY PERIOD

   OFFSET=EVTTIME

    SLOPE= - 1

   ENDON

   REM Set the output as a function of both time

   REM and the current waveform slope

   OUT=AMP* SLOPE*(4*(REALTIME- OFFSET) /PERIOD-1)