Makes it possible to link to another linux-system, not running with

[cow77]

250000 (not Yun, but f.i. an Arduino mega2560 with a modified/expanded
WR703N).

The default could stay at 250000 (Yun).

[cmaglie]

The mega2560 (or whatever CPU) and the Atheros must be set to the same speed. How can you do that on the Atheros side?

C

[cmaglie]

Ok, sorry, now I got it. I should read better before replying.

C

[toggio]

Hi Cow77,
i tried it, but i don't know how to configure it on Linux side.
I tried YunBridge library but i don't understand where to change serial port for communicating with mega2560.
Can you explain this? I think it would be very interesting for many users to use bridge library to connect other Arduino board to different Linux Embedded Boards.

[barbudor]

+1

I would love also to be able to use it with WR703N/OpenWRT or RasPi

Barbudor

2013/10/13 toggio notifications@github.com

Hi Cow77,
i tried it, but i don't know how to configure it on Linux side.
I tried YunBridge library but i don't understand where to change serial
port for communicating with mega2560.
Can you explain this? I think it would be very interesting for many users
to use bridge library to connect other Arduino board to different Linux
Embedded Boards.

—
Reply to this email directly or view it on GitHubhttps://github.com//pull/1583#issuecomment-26223399
.

[cow77]

Setting the tty speed for the system console in OpenWRT is not easy: most of the time you has to make a new kernel. See "http://wiki.openwrt.org/doc/recipes/serialbaudratespeed".

I used a USBtoSerial converter, and set the speed for that tty to the desired baudrate.
But for 250 Kbps you have to use very short lines (with the Yun they are automatic very short).
Or use a lower speed. That's why I needed to be able to set the speed within the Bridge software on the Arduino part.
That way I had a stable connection and I could see some data going if I used a bridge example.

But my installed packages, etc on the Openwrt side are not correct as far as I can see.

That's why I'm still trying to build a Linino kernel (using the Arduino/Linino branch) for my W703N with larger flash and ram (the SLBoat-version).
But up-till-now I get a board error (witch results in "Kernel Panic").

Please keep me informed on your results so together we will get it working.

[toggio]

OK, thank for the info,
i'm not using wrt, i'm using debian on raspberry pi.
I've a usb-serial adapter (ttyUSB0), but i don't know where choose the right port in bridge python library...
Have u idea?

[cow77]

The Python bridge part on the linux side is started by the Arduino BridgeClass f.i.:
Bridge.begin(115200); // make contact with another (linux) processor with 115200 bps

The Arduino Bridge function wait for the u-boot/kernel part to finish and after that it triggers the command shell processor used on the linux-tty where it's connected to, so it starts a shell for that tty-port.
(that means you have to define a command-shell for your tty device (without login))
After that it send a command to the linux processor ("run-bridge").

Run-bridge is a small shell-script:
"#!/bin/sh
cd /usr/lib/python2.7/bridge
exec python bridge.py 2> /tmp/bridge.py-stderr.log"

So the Python bridge is started on the used tty-port and is able to read from and write to that port (=console for the used command shell).

There is nothing to change on the Linux part (except on the avrdude-part, etc!), the bridge should work if delay timings are correct/usable.