Difference between revisions of "GSM/GPRS"

Revision as of 14:42, 20 July 2010

Page under construction... Informations on this page are not guaranteed !!

This page will summarize informations to use the GSM/GPRS module of the APF27Wireless board.

Introduction

GSM/GPRS are generally driven through the RS232 bus. AT commands are used to dialog with the module.
GSM MODEM of the APF27Wireless extension board (APW) is connected to the UART2 (/dev/ttySMX1) of the APF27. We currently are using a Sagem's Hilo module. Datasheets are only available with a NDA, but I'm sure Google fans will find some interesting pdf when trying "Hilo AT commands" ;-).

Linux configuration

• Linux will have to be configured in order to tell it that an APW is connected to your APF27Dev:

$ make linux26-menuconfig

System Type  --->
    Freescale MXC Implementations  --->
            ...
            Extension board (Wireless (APW))  --->
       [*] GSM/GPRS Modem (NEW)
       [ ] Bluetooth & WiFi module (NEW)
       [ ] CSI (Camera) pass-through (NEW)
       [ ] GPS module (NEW)

$ make linux26

• reflash you Linux kernel

Usage

Configure serial port

# stty -F /dev/ttySMX1 raw -echo -echoe -echok

AT commands

• Sending AT commands with cu utility (be sure to have installed it before):

# cu -l /dev/ttySMX1

• Check module presence:

ATI3
SAGEM HiC,A.005.00

OK

• Get constructor name:

AT+CGMI
SAGEM

OK

• Get model name:

AT+CGMM
HILO GPRS

OK

• Enter PIN code:

AT+CPIN="1234"

OK

• Check PIN code status:

AT+CPIN?
+CPIN: READY

OK

Note: Don't launch further AT commands if PIN code wasn't entered successfully

• Check module status (0 Ready, 1 Unavailable, 2 Status unknown, 3 Ringing, 4 Call in progress, 5 Asleep):

AT+CPAS
+CPAS: 0

OK

• Voice call "123456789"

ATD"123456789";
OK

• Terminate current call:

ATH
OK

Tools to look at

• http://www.gnokii.org/
• http://www.alamin.org/en/index.html
• http://www.gammu.org/wiki/index.php?title=Gammu:Main_Page
• http://gatling.ikk.sztaki.hu/~kissg/gsm/index.html

Links

• SMS tutorial
• http://wiki.openmoko.org/wiki/Neo_1973_and_Neo_FreeRunner_gsm_modem
• AT Test commands
• Les commandes AT