[avr-chat] avrdude setting internal osc

[Dean Hall]

Hello,

Dev hardware: Mac OS X 10.4 PowerPC, Keyspan USA-19HS, Atmel  
STK500v2, 10-pin ISP cable to target system.
Dev software: OSX-AVR: avrdude 5.3.1

I had a working ATmega8 system running with an internal oscillator at  
the default rate of 1 MHz.  My customer wants to run at 8 MHz, so I  
used avrdude to set the fuse bits like this:

$ avrdude -p atmega8 -P /dev/cu.KeySerial1 -c stk500v2 -V -t
avrdude> write lfuse 0 0xE8
>>> write lfuse 0 0xE8
avrdude> read lfuse
>>> read lfuse
0000  e8                                                 
|.               |
avrdude> quit
>>> quit


As you can see, I used the value 0xE8, not 0xE4 like I should have.   
Now, I cannot reconnect via avrdude:


$ avrdude -p atmega8 -P /dev/cu.KeySerial1 -c stk500v2 -V -t
avrdude: stk500v2_command(): command failed
avrdude: initialization failed, rc=-1
         Double check connections and try again, or use -F to override
         this check.
avrdude done.  Thank you.


I have tried setting the bit clock by adding this to the command  
line, "-B 1.0" on up to "-B 4.0" with no luck.  I have tried chip  
erase "-e" with no luck.  Is there a way for me to re-establish comms  
with the ATmega8?  Resetting the fuses to defaults would be nice.

!!Dean