cannot burn atmega1284 PU (Mightycore)

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1

Greetings,
I'm trying to burn -unsuccessfully- ATMega 1284 PU , DIP 40.
System: Ubuntu 16.04
Arduino IDE: 1.8.9 (64 bit)

The are the steps I'm following:

  1. I followed these instructions and schematic about ATMega1284 wiring

  2. As suggested, I added the ATmega 1284 board inserting the URL: "https://mcudude.github.io/MightyCore/package_MCUdude_MightyCore_index.json" in my Arduino IDE/preference. This was succesful as I could find the target board in Tools->Board after installing the mighty core boards.

  3. As suggested, I left unaltered all the default parameters:

  • BOD: 2.7V (max low level voltage)
  • Standard pinout for Mightycore
  • Variant: 1284P

  1. I compiled and uploaded in my Arduino UNO the sketch "ArduinoISP"

  2. In Tool/Programmer I selected "Arduino as ISP"

  3. I burned the bootloader, but obtained the error "
    avrdude: stk500_initialize(): (b) protocol error, expect=0x10, resp=0x01
    avrdude: initialization failed, rc=-1
    Double check connections and try again, or use -F to override
    this check."

The complete error message is in the attachment.

Thanks.

error.txt (3.34 KB)

2

Try connecting a 10 uF capacitor between the reset and ground pins on the board you're using as an Arduino as ISP.

3

I added the cap as suggested.
Again an error, but the log is slightly different:
"avrdude: Device signature = 0x1e9706 (probably m1284)
avrdude: Expected signature for ATmega1284P is 1E 97 05
Double check chip, or use -F to override this check."

In attachment the complete log.

UPDATE: I tried right now to change the VARIANT field in Tools: I switched from 1284P to 1284.
The operation seemed to go ok! Now I'll try some test to see if I manage to upload some sketch on the board!

error2.txt (3.16 KB)

4

That's progress! The problem is that the default setting is for the ATmega1284P, but you have the ATmega1284.

You just need to select Tools > Variant > 1284

5

pert:
That's progress! The problem is that the default setting is for the ATmega1284P, but you have the ATmega1284.

You just need to select Tools > Variant > 1284

Yep. I'm not an expert, on the chip I can read:
ATMEL
ATMEGA 1284
PU
1708

I errouneously thought "PU" was for variant "P"

[UPDATE]: I can confirm that it works. After burning the bootloader, I successfully uploaded on 1284 a simple sketch where I tested serial communication, analogRead(), alalogWrite(), digitalWrite etc...

6

In the Atmel days, ATmega1284-PU was the model of the DIP-40 package of the ATmega1284 chip. The equivalent ATmega1284P is ATmega1284P-PU. The TQFP surface mount package version is ATmega1284-AU and the VQFN surface mount package is ATmega1284-MU.

I think Microchip modified how things are labeled a bit after they bought out Atmel. I'm not recalling specifics of how things were changed though. All my chips are from back in the Atmel days.