Dragonchip:一个演示如可使用Timer 0, 1, 2作为计数器的例子，This program counts pulses generated by Counter A using Timer 0, 1, 2，at the same time and toggle PA2, PA1 and PA3 respectively. Pulses from PA1 then feed into PB6(T2EX) to trigger Timer 2 interrupt to toggl

用NS2仿真802.11b WLAN信道。指出现有NS2代码中的错误，给出SNR、BER的计算公式和代码实现。,Simulate 802.11b Channel within NS2 This document describes how to simulate one 802.11b channel in NS2. It focuses on how to simulate wireless transmission error due to bad channel quality. Th