GSM/GPRS
From ArmadeusWiki
This page will summarize informations to use the GSM/GPRS/3G module of the APF27Wireless board and the APF51Dev (optional).
Contents
Introduction
GSM/GPRS are generally driven through the RS-232 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.
- GSM/3G MODEM of the APF51Dev is connected to the i.MX processor through an UART implemented in the FPGA. So the corresponding bitfile has to loaded before trying to access the MODEM.
Both are using a Sagem's Hilo module. Hilo AT commands can be found here
Linux configuration (APF27Dev only)
- Linux will have to be configured in order to tell 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
APF27
# export GSM_PORT=/dev/ttySMX1 (or /dev/ttymxc1 on recent kernels) # stty -F $GSM_PORT raw -echo -echoe -echok 115200
APF51Dev
- Don't forget to put "Wireless" jumper J42 on your APF51Dev (near microSD connector) AND power on FPGA Bank 3 (with corresponding jumper J39).
- On APF51Dev, GSM/3G module is accessed through serial ports synthetized in APF51's FPGA. So we have to load it first. (Needed dual UARTs FPGA firmware can be found under armadeus-4.0 distribution in firmware/pod_scripts directory, with the POD script needed to regenerate it, and is by default installed in rootfs).
# load_fpga /lib/firmware/fpga/apf51_gsm_gps_firmware.bin
Once firmware loaded, drivers related to FPGA can be used :
# modprobe irq_ocore # modprobe 8250 Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled # modprobe twin_uarts_irq_mng # modprobe twin_uarts_16750 serial8250.0: ttyS0 at MMIO 0xb8000020 (irq = 320) is a TI16750 serial8250.0: ttyS1 at MMIO 0xb8000040 (irq = 321) is a TI16750
Bring MODEM out of reset state (POK_IN/PWON pin, connected to PMIC GPIO6):
# modprobe wm831x-gpio # echo 245 > /sys/class/gpio/export # echo out > /sys/class/gpio/gpio245/direction # echo 1 > /sys/class/gpio/gpio245/value
- Configure serial port:
If the /dev/ttyS[0-1] files don't exist, create it/thel with mknod :
# mknod /dev/ttyS0 c 4 64 # mknod /dev/ttyS1 c 4 65
Then :
# export GSM_PORT=/dev/ttyS0 # stty -F $GSM_PORT raw -echo -echoe -echok 115200
AT commands
- Sending AT commands with cu utility (be sure to have installed it before):
# cu -l $GSM_PORT
( To exit cu you will have to type ~. )
- Check module presence:
ATI3 SAGEM HiC,A.005.00 OK
Note: By default, for Hilo v2 module, no echo are printed on serial console. Then you can't see what you type.
To reactivate the echo type ATE1 |
- Get constructor name:
AT+CGMI SAGEM OK
- Get model name:
AT+CGMM HILO GPRS OK
- Enter PIN code (here 0000). !! Use your own and beware that you will only get 3 tries !!:
AT+CPIN="0000" OK
- Check PIN code status:
AT+CPIN? +CPIN: READY OK
- Check module status (0 Ready, 1 Unavailable, 2 Status unknown, 3 Ringing, 4 Call in progress, 5 Asleep):
AT+CPAS +CPAS: 0 OK
- Get Indicator control (<battchg>[0-4],<signal>[0-4],<service>0/1,<message>0/1,<call>0/1,<smsfull>0/1):
AT+CIND? +CIND: 0,4,1,0,0,0,1 OK
- Get signal quality (should be better than 12/99):
AT+CSQ +CSQ: 24,99 OK
- Voice call "123456789" (; is important here to signify a voice call, otherwise a data call is tried and may fail if you don't have the right subscribe)
ATD"123456789"; OK
- Terminate current call:
ATH OK
Tools to look at
- http://www.developershome.com/sms/freeLibForSMS.asp
- 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
Data tranfers (EDGE/3G)
PPP installation (Done by default on APF51)
$ make linux26-menuconfig
Device Drivers ---> [*] Network device support ---> <M> PPP (point-to-point protocol) support [ ] PPP multilink support (EXPERIMENTAL) [ ] PPP filtering <M> PPP support for async serial ports < > PPP support for sync tty ports < > PPP Deflate compression < > PPP BSD-Compress compression < > PPP MPPE compression (encryption) (EXPERIMENTAL) < > PPP over Ethernet (EXPERIMENTAL)
$ make menuconfig
Package Selection for the target ---> Networking applications ---> [*] pppd [ ] filtering [ ] radius
$ make linux26 && make
- reflash kernel & rootfs
PPP configuration
Note: Following instructions are given for the French operator "Bouygtel" and may need to be ajusted accordingly, depending on your operator/country |
# mkdir -p /etc/ppp/peers/ # cat > /etc/ppp/peers/bouygtel <<EOF noauth #connect "/usr/sbin/chat -v -f /etc/chatscripts/bouygtel" debug ttyS0 defaultroute noipdefault usepeerdns EOF # mkdir -p /etc/chatscripts/ # cat > /etc/chatscripts/bouygtel <<EOF ABORT BUSY ABORT 'NO CARRIER' ABORT VOICE ABORT 'NO DIALTONE' ABORT 'NO ANSWER' ABORT DELAYED OK ATE1 OK AT+CPIN=0000 OK-AT-OK AT+CFUN=1 OK AT+COPS? OK AT+CSQ OK-AT-OK 'AT+CGDCONT=1,"IP","ebouygtel.com","",0,0' OK-AT-OK 'AT&FE0Q0V1' OK-AT-OK 'ATD*99#' CONNECT "" EOF #cat > /etc/ppp/options.ttyS0 <<EOF 115200 EOF
- Launch the beast:
# pppd /dev/ttyS0 115200 call bouygtel
- Might be needed afterwards:
# cp /etc/ppp/resolv.conf /etc/resolv.conf # route add default ppp0 (due to defaultroute option in ppp ?)
Test
# ping www.google.fr