凹凸电子软件笔试题

　　1. Select ONE of the following projects to discuss:

　　a. Signal Filtering: You are given a sampled realtime waveform consisting

　　of a sensor reading mixed with highly periodic impulses and high frequency noi

　　se.The desired output is the realtime filtered sensor signal with the impulses

　　and noise removed, and a readout of the impulse period. The FFT may not be us

　　ed.

　　b. Interrupt Processing.A headware register consisting of eight independen

　　t edge triggered latches is used to record external asynchronous interrupt req

　　uests. When any of the request bits are latched, a software interrupt is gener

　　ated. The software may read the latch to see which interrupt(s) occurred. Writ

　　ing a one to any latch bit will clear the latch. How does that software assure

　　that no interrupt request is ever missed?

　　c. User Interface: a prototype MP3 player interface consisting of a playli

　　st display and a few control buttons is given to you. How would you make the i