Re: [avrdude-dev] Programming lfuse on a usb1287

[Ryan Gammon]

Appears the AT90USBKey ships with the memory lock bits set. I didn't realize
this affects programming the fuses. Doing a chip erase clears the lock bits,
and allows me to modify the fuses.

On 4/20/07, rggammon <address@hidden> wrote:
> Hi folks,
>
> I'm trying to set the low fuse on an at90usb1278 (attached to a AT90USBKey
> board). In particular, I'm trying to program CKOUT.
>
> I'm using this guy as a programmer:
> http://www.xilinx.com/support/programr/jtag_cable.pdf (it's worked in the
> past for jtag programming cpld's, and it appears one can use it to ISP
> program avr's).
>
> Verbose output below -- I seem to be communicating, but the fuse write
> doesn't appear to take. Any ideas?
>
> >avrdude -c xil -p usb1287 -v -v -u -U lfuse:w:0x1E:m
> ...
> bitbang_cmd(): [ AC 53 00 00 ] [ 0F FF 53 00 ]
> avrdude: AVR device initialized and ready to accept instructions
>
> Reading |                                                    | 0% 0.00s
> bitbang_cmd(): [ 30 00 00 00 ] [ 00 30 00 1E ]
> bitbang_cmd(): [ 30 00 01 00 ] [ 00 30 00 97 ]
> bitbang_cmd(): [ 30 00 02 00 ] [ 00 30 00 82 ]
> avrdude: Device signature = 0x1e9782
> bitbang_cmd(): [ A0 0F FC 00 ] [ 00 A0 0F FF ]
> bitbang_cmd(): [ A0 0F FD 00 ] [ 00 A0 0F FF ]
> bitbang_cmd(): [ A0 0F FE 00 ] [ 00 A0 0F FF ]
> bitbang_cmd(): [ A0 0F FF 00 ] [ 00 A0 0F FF ]
> avrdude: reading input file "0x1E"
> avrdude: writing lfuse (1 bytes):
>
> Writing |                                                    | 0% 0.00s
> bitbang_cmd(): [ 50 00 00 00 ] [ 00 50 00 5E ]
> bitbang_cmd(): [ AC A0 00 1E ] [ 00 AC A0 00 ]
> bitbang_cmd(): [ 50 00 00 00 ] [ 1E 50 00 5E ]
> bitbang_cmd(): [ 50 00 00 00 ] [ 00 50 00 5E ]
> bitbang_cmd(): [ 50 00 00 00 ] [ 00 50 00 5E ]
> [... repeated ...]
>
> ***failed;
>
> [...]
>
> avrdude: verifying ...
> avrdude: verification error, first mismatch at byte 0x0000
>          0x1e != 0x5e
> avrdude: verification error; content mismatch
>
>
> --
> View this message in context:
> http://www.nabble.com/Programming-lfuse-on-a-usb1287-tf3611733.html#a10093000
> Sent from the AVR - AVRdude - Dev mailing list archive at Nabble.com.
>
>
>
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