Hello list,
Our new Fluksometer hardware version will use a bitbanged SPI bus to
communicate between an Atheros AR2317 WiSoC on the main board and an AVR
on the sensor board. The AR2317 contains a MIPS 4KEc processor running
OpenWRT.
I have used the patch of Radoslav Kolev attached to his message posted
to this mailing list [1] as a starting point to construct a bitbanged
SPI over GPIO Avrdude programmer using the 'deprecated' gpio-dev instead
of gpio-sysfs. This is because the Atheros Backfire build of OpenWRT
still uses gpio-dev for driving its GPIO pins. The patches against
Avrdude 5.10 are available on Github [2]. Since the Fluksometer is an
embedded device having a mere 8MB of flash, we needed to trim Avrdude as
much as possible. The 120 and 130 patch in [2] remove all non-gpio
programmers and small/old AVRs respectively. Applying these two patches
reduces the avrdude/avdude.conf file size from 480k/497k to 169k/309k.
This GPIO programmer on an AR2317 flashes the AVR at about 1kB/sec,
which is quite satisfactory.
+1 for #avrdude uses in embedded devices :-)
Best regards,
Bart Van Der Meerssche
Flukso
[1]: http://lists.nongnu.org/archive/html/avrdude-dev/2010-04/msg00003.html
[2]:
http://github.com/icarus75/flukso/tree/develop/mote/v2/openwrt/package/avrdude/patches
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