Flashforth 5.0 on ATmega328p Xplained-min

[Randall Young]

Howdy all,

I thought this would be a quick install... but as I am updated to AVRdude 6.3, on Ubuntu 16.04, to get support for the mEDBG programming/debugging interface... when I execute...

rasyoung@ubuntua10:~/Reserve/FlashForth/flashforth-code-283ac4f6c9d62457d8a9f812359f111ebbf3ca0f/avr/hex$ sudo avrdude -p m328p -c xplainedmini  -e -u -U flash:
w:ff_uno.hex:i -U efuse:w:0x07:m -U hfuse:w:0xda:m -U lfuse:w:0xff:m
avrdude: usbdev_open(): WARNING: failed to set configuration 1: could not set config 1: Device or resource busy

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.05s

avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: erasing chip
avrdude: reading input file "ff_uno.hex"
avrdude: writing flash (32542 bytes):

Writing | ################################################## | 100% 0.00s

avrdude: 32542 bytes of flash written
avrdude: verifying flash memory against ff_uno.hex:
avrdude: load data flash data from input file ff_uno.hex:
avrdude: input file ff_uno.hex contains 32542 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 0.00s

avrdude: verifying ...
avrdude: 32542 bytes of flash verified
avrdude: reading input file "0x07"
avrdude: writing efuse (1 bytes):

Writing | ################################################## | 100% 0.03s

avrdude: 1 bytes of efuse written
avrdude: verifying efuse memory against 0x07:
avrdude: load data efuse data from input file 0x07:
avrdude: input file 0x07 contains 1 bytes
avrdude: reading on-chip efuse data:

Reading | ################################################## | 100% 0.01s

avrdude: verifying ...
avrdude: verification error, first mismatch at byte 0x0000
         0xff != 0x07
avrdude: verification error; content mismatch

avrdude done.  Thank you.

It chokes setting the fuse bits I believe. Quick search on Google suggests this may be benign, I guess trying to write un-implmented fuse bits, but I am still confused.

I get a a garbled response to the terminal.

Any suggestions?

Thanks

Randy

[Mikael Nordman]

Here is one suggestion
-U efuse:w:0xff:m

Some versions of avrdude handle the unused bits of the extended fuse differently when it verifies the bits.
The newer versions of avrdude reads and verifies the unused high 5 bits as ones.
Some older version reads and verifies the unused high bits as zeroes.
Thats the explanation.

BR Mikael

[Randall Young]

Thanks!

That's it exactly ... working like a charm. Fuse settings seems to clobber debugging from Atmel Studio 7, but that is a problem for another day ...

Here's the correct command line to burn FF 5.0 onto the ATmega328p Xplained-Mini using the prerequisite avrdude 6.3.

sudo avrdude -p m328p -c xplainedmini  -e -u -U flash:w:ff_uno
.hex:i -U efuse:w:0xff:m -U hfuse:w:0xda:m -U lfuse:w:0xff:m

Ignore the error, it does work ...

This tests fine with the Python shell script at 9600 baud. Be sure to use dmesg to determine which comport is assigned. I rigged my own udev rule for this board.

# /etc/udev/rules.d/99-avrprogrammer.rules
#
# Udev rules to make AVR programmers user-accessible
#Atmel ATmega328p Xplained Mini
SUBSYSTEM=="usb", ATTRS{idVendor}=="03eb",ATTRS{idProduce}=="2145",GROUP="users", MODE="0666"

Best,

R.