GSM/GPRS
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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 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
