the atusb boot loader (how to use it for the first time)
werner at almesberger.net
Wed May 11 19:28:14 EDT 2011
In the previous mail, I described how to update the boot loader in
the atusb card. Now let's put it to good use.
Flashing the boot loader erased the application in the ATmega32U2
microcontroller on atusb. The boot loader detects that there is no
application and patiently waits for someone to send the rest of the
What you need:
- an atusb board with the boot loader from ben-wpan git commit
85f60de9d52195afb3a0232a03e850d96584bb9a or newer
- a PC running Linux with an available USB port
- dfu-util, running on the PC
- the atusb application (firmware) binary
There are three ways to get dfu-util:
1) Your Linux distribution may already provide a dfu-util package, so
just follow the package installation procedure
2) Build it from sources:
git clone git://git.openezx.org/dfu-util.git
3) If you're an Openmoko veteran, you probably already have dfu-util
installed. The atusb boot loader is compatible also with older
versions of dfu-util.
There are two ways to get the atusb application binary:
1) Build it on your own, using these instructions:
2) Download this pre-compiled binary:
wget -O atusb.bin \
(Or any updated version I may put there in the future.)
Next, plug atusb into your Linux PC and wait until it enumerates
(usually takes about one second). The LED on atusb should switch on
and stay on continuously.
Run this command (*):
dfu-util -d 20b7:1540 -D atusb.bin
(*) From target "dfu" of
dfu-util should run for 1-2 seconds, then report success. About two
seconds after dfu-util is done, the atusb LED should turn off and
atusb enumerates again.
lsusb -d 20b7:1540 -v should show
bDeviceClass 255 Vendor Specific Class
idVendor 0x20b7 Qi Hardware
idProduct 0x1540 ben-wpan, AT86RF230-based
iSerial 1 46303334393715081003
bInterfaceClass 255 Vendor Specific Class
Again, the serial nummer should differ between boards.
Congratulations, your atusb is now running the latest firmware and
is ready for mischief !
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