AVR-Chat

Man,

I finally got everything assembled.  I had been slowly working out
program bugs, downloading via ISP using avrdude under Linux.  With no
apparent cause, the following screen came back upon attempting to
download my latest version:


    [root@Linuxmachine avrtest]# make flash
    avrdude -p m128 -c stk500  -P /dev/ttyS0 -U flash:w:avrtest.hex

    avrdude: stk500_program_enable(): failed to enter programming mode
    avrdude: initialization failed, rc=-1
             Double check connections and try again, or use -F to override
             this check.

    avrdude done.  Thank you.
    make: *** [flash] Error 1

Now, it had been running fine, I was making only minor program
changes, and the connections were fine.
So I re-executed avrdude with -F, and got:


    [root@Linuxmachine avrtest]# avrdude -F -p m128 -c stk500  -P
/dev/ttyS0 -U  flash:w:avrtest.hex

    avrdude: stk500_program_enable(): failed to enter programming mode
    avrdude: initialization failed, rc=-1
    avrdude: AVR device initialized and ready to accept instructions
    
    Reading | ################################################## |
100% 0.06s
    
    avrdude: Device signature = 0x000000
    avrdude: NOTE: FLASH memory has been specified, an erase cycle
will be performed
             To disable this feature, specify the -D option.
    avrdude: erasing chip
    avrdude: stk500_program_enable(): failed to enter programming mode
    avrdude: reading input file "avrtest.hex"
    avrdude: input file avrtest.hex auto detected as Intel Hex
    avrdude: writing flash (6442 bytes):
    
    Writing | ################################################## |
100% 5.04s
    
    avrdude: 6442 bytes of flash written
    avrdude: verifying flash memory against avrtest.hex:
    avrdude: load data flash data from input file avrtest.hex:
    avrdude: input file avrtest.hex auto detected as Intel Hex
    avrdude: input file avrtest.hex contains 6442 bytes
    avrdude: reading on-chip flash data:
    
    Reading | ################################################## |
100% 3.63s
    
    avrdude: verifying ...
    avrdude: verification error, first mismatch at byte 0x0000
             0x0c != 0x00
    avrdude: verification error; content mismatch
    
    avrdude done.  Thank you.


Has anyone ever seen anything like this before?  Maybe my ISP
programmer went bad?  I know I haven't used too many write cycles. 
The MAVRic board seems OK, it keeps running the last program I
successfully loaded.  I'm really stumped on this one, dead in the
water.  Thanks for any advice!

Mike Ross

My apologies if this shows up twice....