说明：  一个控制设备中接收发送短信部分的驱动。分析短信pdu，并根据相应的7bit,8bit或16bit模式解析出实际短信文本，对于中文还包括了unicode到gb2312的转码。硬件平台stm32103VB，用Keil写的
(A control device to send text messages to receive part of the drive. Analysis of SMS pdu, and in accordance with the corresponding 7bit, 8bit or 16bit mode of parsing out the actual message text, of the Chinese language also includes unicode to gb2312 transcoding. Hardware platform stm32103VB, written with the Keil)