Posted by I wanted to interface something to my WR841, without too much hassle.
But also some cheap way to do so, to keep advantages of the WR841 price…
Luckly, I already had an AVR-USB based platform, based on ‘Little Wire’ : http://littlewire.cc/
With its latest v1.1 firmware, 1-Wire is available via the Little Wire : that’s my perfect candidate to
add a DS18B20 and to make some temperature measures.
I have quickly cross-compiled the onewire.c example given in the C computer interfacing sources
(Openwrt buildroot, linking the source with libusb-0.1.12) and here is the result :
root@OpenWrt:~# cat /etc/openwrt_release
DISTRIB_ID="OpenWrt"
DISTRIB_RELEASE="Bleeding Edge"
DISTRIB_REVISION="r33276"
DISTRIB_CODENAME="attitude_adjustment"
DISTRIB_TARGET="ar71xx/generic"
DISTRIB_DESCRIPTION="OpenWrt Attitude Adjustment r33276"
root@OpenWrt:~# lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Bus 001 Device 003: ID 1781:0c9f Multiple Vendors USBtiny
Bus 001 Device 004: ID 1e3d:8246
root@OpenWrt:~# /root/onewire
> Little Wire firmware version: 1.1
> Address search ...
> Addr#0: 28 4F 4F 7E 2 0 0 3B
> End of search with 1 device(s) found
> Start the talking with the last device found
> 64 1 4B 46 7F FF C 10 1
> 63 1 4B 46 7F FF D 10 15
> 63 1 4B 46 7F FF D 10 15
> 64 1 4B 46 7F FF C 10 1
Update 20/03/2013 :
Created an OpenWrt source package and an ipkg (not tested)
Hi,
I did not find your name on this page.
This is an interesting project.
I’m doing a similar project, but with a TL-WR703N router and LittleWire.
Could you help me a little bit to port littleWire over to the mips WR703N router.
I do not need much help, just a little clarification.
I have difficulty to cross-compile the LittleWire library over to MIPS.
In the C libraries, I compiled on debian linux using gcc, without problems.
It works good.
I’m not a newbie and not an expert. I have some skills at C dev.
For example, I have ported my own USB to serial driver from i386 to
the mips WR703N router, no problem. It works good.
This is what I get as an error, when I use the makefile.
The only change I made to the makefile is change CC=gcc to
CC=mips-linux-uclibc-gcc .
————–
mike@mike-System-Linux-Mint /home/mike/MIPStoolchains/littleWire $
export PATH=/home/mike/MIPStoolchains/staging_dir_mips/bin:$PATH
mike@mike-System-Linux-Mint ~/MIPStoolchains/littleWire $ make library
Building library: opendevice…
mips-linux-uclibc-gcc `libusb-config –cflags` `libusb-config –libs`
-Ilibrary -O -g -D LINUX -c library/opendevice.c
In file included from library/opendevice.c:18:
library/opendevice.h:27:77: error: usb.h: No such file or directory
In file included from library/opendevice.c:18:
library/opendevice.h:33: error: expected ‘)’ before ‘*’ token
library/opendevice.h:44: error: expected ‘)’ before ‘*’ token
library/opendevice.c:86: error: expected ‘)’ before ‘*’ token
library/opendevice.c:116: error: expected ‘)’ before ‘*’ token
make: *** [opendevice] Error 1
————–
If you have the time to help, It would be appreciated.
I’m working on a open-source Hardware/Software project and would
gladly send you what I have.
Mike
Hi Mike,
My name is Jean-Jacques (you can use JJ).
Your problem, and from what I remember, is probably related to the way you are compiling with ‘libusb-config’.
It will return your host’s configuration, which is not what will run on the target.
I remember I had to change paths in the Makefile for libusb to get it to work, but I never took the time to create a clean package for it.
I will have a look at my code archive and will give you details in the next couple days.
Thanks,
JJ
I found that my Makefile was starting by :
OPENWRT=/home/jjm/openwrt/trunk
STAGING_DIR=$(OPENWRT)/staging_dir
export STAGING_DIR
CC=$(STAGING_DIR)/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/bin//mips-openwrt-linux-gcc
USBFLAGS = -I$(OPENWRT)/build_dir/target-mips_r2_uClibc-0.9.33.2/libusb-0.1.12
USBLIBS = -L$(OPENWRT)/build_dir/target-mips_r2_uClibc-0.9.33.2/libusb-0.1.12/.libs/ -lusb
Good Luck,
JJ
I took some time today to create a package and an ipkg file, but I have not tested them.
See the update at the end of the article.
JJ