D. GPRS Control and Communication Module
GPRS control and communication module function is to be
realized through a serial port programming to control GPRS
module, send corresponding AT instructions, call system
function, complete GPRS module initialization and related
function realization.
In GPRS communication, according to the different
processing it has different applications, basically have main
program, functional procedures and the keyboard control
proceduresDŽ
With test module, ARM platform of keyboard is to provide
user input/output interface, user's all the instructions are needed
to achieve the keyboard program flowchart, keyboard module
as shown, mainly including keyboard initialization, make a
phone call, answer the phone, send short messages, view the
short message, and waiting for wireless communication
common keyboard as operation mode. Development processes
is shown as figure 3: