【极客的MSP430】用MSP430G2模拟时序实现了USB1.1通信

wstt

【极客的MSP430】用MSP430G2模拟时序实现了USB1.1通信 [复制链接]

基本的IO配置如下：
P1.0 LED Anode for Bit-Banged RS232 sinal for outputting debug messages

P2.0 Sync-LED Anode
P2.1 Sync-LED Cathode (unimportant, only soldered it in this way to be able to measure brightness later)

P2.2 D- over about 50 Ohms (two 100 Ohms resistors in parallel in my case)
P2.3 D+ over about 50 Ohms

P2.5 Resistor 1.5kOhms to D- as switchable connect/disconnect simulator

XIN feeded with digital external 18 MHz clock. Note that the XO runs with same voltage as MSP430, altough rated for 5V, it works.

D- has to be on a pin that for clock cycle reasons is accessible with the constant generator (the lower four pins) and D+ only has to be on the same port as D-.

最关键的是提供了源码

[ 本帖最后由 wstt 于 2012-12-3 19:35 编辑 ]

tiankai001

不错啊，可以学习一下