短信的发送需要GSM模块和处理器协作完成，GSM模块与ARM处理器通过串口连接，处理器向串口发送接收AT命令与GSM模块形成通信回路。中文短信的发送采用PDU模式，根据PDU模式标准形成PDU发送包，实现短信发送。本文根据无线电话项目的短信发送模块的实现开发流程编写-Send text messages need to GSM module and processor collaboration, GSM module and the ARM processor through the serial port to connect the processor to the serial port to send to receive AT commands and GSM communication modules to form loops. Chinese text messages sent using PDU mode, PDU mode in accordance with the standard form PDU send packets to achieve SMS. Based on wireless phones to send text messages project module development process to prepare