华为GSM modem GTM900B的驱动代码，基于ucOS操作系统，使用modem串口，应该在其他CPU上也能使用，本人用在philips的ARM片子上-Huawei GSM modem GTM900B driven code, based on ucOS operating system, Serial modem use, in other CPU should also use, I used philips films on the ARM

ARM based GSM/GPRS Source coes

ymodem传输协议，c代码，在Linux系统已经验证过。在arm架构下需要自己交叉编译。(Ymodem transport protocol, C code, in the Linux system has been verified. In the arm framework, you need to cross compile yourself.)