Programming a Atmega32U4 via USBASP

Question

I created my own custom board and added a ICSP header, although I can't seem to program it.

My board has a Atmega32U4 (no external crystal) and I keep getting an error when I use the command:

avrdude -p m32u4 -c usbasp -B 64 -U flash:w:/Users/Jbonnett/Desktop/RGBWstrandtest.ino.hex

The error:

avrdude: set SCK frequency to 8000 Hz 
avrdude: error: program enable: target doesn't answer. 1 
avrdude: initialization failed, rc=-1
     Double check connections and try again, or use -F to override
     this check.

As you can see I am trying to program the chip in slow mode and I also tried the hardware jumper for slow mode. Although the error is telling me that it can't see my custom board.

The programmer that I am using is this one: https://www.ebay.co.uk/itm/USBASP-USB-ISP-Programmer-for-Atmel-AVR-ATMega328-ATMega32U4-Arduino/322662323277

Here are a couple of photos to show that the custom board is wired up correctly: Please note that the programmer can be powered by the custom board.

Thanks for any help :)

Edit: My Schematic

add schematics of the custom board to question. is the 2x3 header a standard Arduino ISCP header? — Juraj
– Juraj, Commented Dec 6, 2018 at 21:22
do you have a not-by-you-made 32u4 board? you could try the programmer first with that — Juraj
– Juraj, Commented Dec 8, 2018 at 10:13

coolbreeze · Accepted Answer · 2018-12-06 20:18:07Z

1

With the limited information, there are many possibilities, you could check the following, though not a comprehensive list, should narrow it down:

(1) Try using the -F parameter to check if you can get a little further

(2) Check if the USBAsp works with a standard 32u4 board

(3) Check if the ISP header connections are correct, sometimes the labeling of the pins might be reversed due to any mistake in the schematic/layout/fab

(4) The Fuses on the 32u4 may be set to use external oscillator (though I have never seen this setting on factory 32u4, default is always internal RC), in which case we need an external crystal to program.

edited Dec 6, 2018 at 20:18

answered Dec 6, 2018 at 20:03

coolbreeze

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6 Comments

Jamie Bonnett Over a year ago

Hi @coolbreeze, I did try the -F argument with no joy. I can't see the USBAsp not working although I have no information on compatibility. Here is my schematic Imgur. Any idea how to set the correct fuses? I haven't got the slightest clue when it comes to them.

coolbreeze Over a year ago

If you could post the output of avrdude when using the -F option, it would help. Also add the -v option for verbose output.

coolbreeze Over a year ago

ISP Header seems to be ok from the schematic, need to check if there are any connectivity/soldering problems on board. Is the chip a new 32u4 from the factory( direct from one of the Atmel dealers) or has this been programmed previously (by you or sourced from one of the sources who pre-program the chips with code)?

Jamie Bonnett Over a year ago

I purchased it from here, although I can't see if it ships with a bootloader pre-installed.

Jamie Bonnett Over a year ago

Sorry I must have forgot the link :( Link to ATMega32U4-MUR See section 21.4 in the documentation.

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Jamie Bonnett · Accepted Answer · 2019-01-03 18:48:45Z

0

Ok so I added a crystal and it works! Even though it has an internal one I have no idea why it didn't work without one :(

answered Jan 3, 2019 at 18:48

Jamie Bonnett

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