通过对串口的初始化，发AT指令激活GPRS模块，实现对gprs的初始化。实现了简单的收发短信功能。-Through the serial port initialization, hair AT command to activate GPRS module enables the gprs initialization. To achieve a simple send and receive text messages.

SIM900 sms的驱动,基于PIC单片机，已通过测试-THE code is used for SIM900 sms FUNCTION

51单片机串口通过AT指令控制GPRS发送接收短信，并显示在LCD上，包括显示和串口，AT指令的底层驱动-51 MCU GPRS AT commands via the serial port transmit and receive text messages, and displayed on the LCD, including display and serial, AT commands underlying driver