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Return to Manually using GSM.

Retrieved from "http://wiki.openmoko.org/wiki/Manually_using_GSM"
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When men were real men and typed their own AT commands...

This is a short guide how to manually get GSM going.

Requirements

  • GTA01Bv2 or GTA01Bv3 with very recent u-boot bootloader, providing usbtty (serial over USB) support)
  • Do not connect any debug board!

Walk-Through

Booting the system

  • Make sure the rootfs you use has 'auto usb0' in /etc/network/interfaces
  • Configure the host's usb0 interface to 192.168.0.200 netmask 255.255.255.0
  • ssh to root@192.168.0.201

Disabling the getty

Our default images all have a getty running on /dev/ttySAC0, please edit /etc/inittab and disable the getty on that port

Reducing the loglevel

NOTE: You don't need this in kernel builds with patchset ≥ 1288


To keep the kernel from writing to /dev/ttySAC0, you need to use dmesg -n1.

Powering up the GSM Modem

  • verify there is no getty or any other app running on /dev/ttySAC0 
root@fic-gta01:~$ lsof | grep ttySAC0
  • power-up the GSM Modem 
root@fic-gta01:~$ echo "1" > /sys/bus/platform/devices/gta01-pm-gsm.0/power_on

Connecting to GSM Modem

  • change permissions on ttySAC0 
root@fic-gta01:~$ chown uucp.uucp /dev/ttySAC0
  • setup /usr/spool/uucp 
root@fic-gta01:~$ mkdir /usr/spool
root@fic-gta01:~$ mkdir /usr/spool/uucp
root@fic-gta01:~$ chown uucp.uucp /usr/spool/uucp
  • access the GSM Modem UART 
root@fic-gta01:~$ cu -l /dev/ttySAC0
Connected.
AT-Command Interpreter Ready
OK

Using it manually

Registering with the Network 

ATE1
OK
AT+CFUN=1
ERROR
AT+CPIN="...."
OK
AT+COPS
OK

Answering an incoming call 

RING
ATA
OK

Dialling an outgoing call

To actually be able to talk you have to configure your audio accordingly 

root@fic-gta01:~$ cd /etc/alsa/
root@fic-gta01:/etc/alsa$ wget http://opensource.wolfsonmicro.com/~gg/gsmheadset.working.state
root@fic-gta01:/etc/alsa$ alsactl -f /etc/alsa/gsmheadset.working.state restore

Up the "Amp right" volume to hear the speaker on both ears, then dial 

ATD012340234;

Hanging up 

ATH
OK

Using gsmd

You can use the gsmd and libgsmd-util programs to have a slightly more high-level interface to the GSM Modem. It's still console based, though.

For further instructions, see gsmd