Call

From OpenEZX

Contents 1 Warning 2 Purpose of this small howto 3 Prerequisites 4 Calling 5 Audio on Calls 6 TODO

Warning

Calling is under development and not ready for end-users jet. Esspecially the "echo1 > /proc/pcap" might damage your phone, since I wrote this patch blindly with values I found on the Mailing List without knowing what they mean.

This Howto was tested only on a A780. I don't know if other phones need other PCAP settings.

Purpose of this small howto

Showing that calling with audio works, but nicer integration into the kernel is necessary. DEVELOPERS WANTED - especially the ones with sound-driver-skills.

Prerequisites

I assume you have a working userspace installed. I assume you know how to build a kernel.

• Linux Kernel; 2.6.23 and 2.6.24 should work.
  1. Apply the patches from svn.openezx.org
  2. Apply this ugly patch to enable pcap-writes from userspace
• /angstrom/build/tmp/cross/bin/arm-angstrom-linux-gnueabi-gcc -o openbpaudio openbpaudio.c
• boot the just built zImage with boot_usb. You need to have a secondary-stage-blob2 flashed to the phone. (boot_usb with the original first-stage-bootloader wouldn't work, because the key-combo sets the BP to flash-mode. In this mode, calling is not possible.)
• minicom: ipkg install minicom

Calling

login 4 times (terminal1-terminal4) to your phone

terminal-1$ killall ezxd;
terminal-1$ cat /dev/mux0

terminal-2$ minicom

Now use the menu to configure minicom. It should talk to /dev/mux4. 115200 8n1 work fine.

ATE1

This tells the BP to echo the characters we enter.

AT+CPIN=1,"XXXX"

Replace XXXX with your PIN

ATDXXXXXXXXXXXXXX

Replace XXXXXXX with the number you want to call. Now it should ring on the other side of the line.

ATH

Hangup.

+CLIP: "XXXXXXXXXX",129

If you see this on terminal1 (the one where you did cat /dev/mux0), it meens you are recieving a call.

ATA

Accept the call.

Audio on Calls

So far we manged to make calls, but without sound. This is because the internal audio routing needs setup.

After ATDXXXXX(or ATA):

terminal-3$ openbpaudio

Yes, the tiny tool we compiled before. It just does an open("/dev/snd/pcmC0D2p", O_RDONLY);

terminal-4$ echo1 > /proc/pcap

Setting PCAP-Registers. That's why we needed an extra kernel-patch above.

And now, it still might not work.

terminal-4$ echo1 > /proc/pcap
terminal-3$ openbpaudio
terminal-4$ echo1 > /proc/pcap

Yust repeat, and now you should get audio in both directions.

TODO

1. Integrate setting of PCAP-Registes into the Sound-SOC-Driver.
2. "Port" gsmd from openmoko to ezx