Main function of HDLC communication control procedure describe and instance HDLC通讯控制规程的主要功能描述和举例
According to system functional requests and hardware design, it has been accomplished working software using system software architectures of digital signal processor, including AT command, PDU code, communication protocol, one-chip computer control procedure and explaining of SMS develop interface. 同时,根据系统功能需要和硬件设计方案,完成了系统的软件设计,包括AT指令、PDU编码、通信协议、单片机控制程序和短信开发接口说明,并给出部分软件流程图和子程序。