Nano Every ATMEGA4809 registers header file

Projects Programming
1

Hello,

I need to directly access registers within the Nano Every ATMEGA4809 (reference voltage options and similar; not covered by existing libraries). I'm guessing there's a header file somewhere with all the registers - could someone point me to it please?

Apologies in advance if this is an old subject.

Thanks - Paul.

2

The analog reference's shown here for the megaAVR boards will apply to the Nano Every.

Arduino megaAVR Boards (Uno WiFi Rev2)

  • DEFAULT: a built-in 0.55V reference
  • INTERNAL: a built-in 0.55V reference
  • VDD: Vdd of the ATmega4809. 5V on the Uno WiFi Rev2
  • INTERNAL0V55: a built-in 0.55V reference
  • INTERNAL1V1: a built-in 1.1V reference
  • INTERNAL1V5: a built-in 1.5V reference
  • INTERNAL2V5: a built-in 2.5V reference
  • INTERNAL4V3: a built-in 4.3V reference
  • EXTERNAL: the voltage applied to the AREF pin (0 to 5V only) is used as the reference

https://www.arduino.cc/reference/en/language/functions/analog-io/analogreference/

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On windows?

4

I’m using the standard Arduino IDE. It recognises common IO registers such as PORTB but not the VREF CTRLA & CTRLB ones, for example.

5

Thanks, I’ll try those although I’d still be interested in a general header for all ATMEGA4809 registers.

6

Make sure for Registers Emulation Atmega 328 you select "None"

You may want to try [MegaCoreX] (GitHub - MCUdude/MegaCoreX: An Arduino hardware package for ATmega4809, ATmega4808, ATmega3209, ATmega3208, ATmega1609, ATmega1608, ATmega809 and ATmega808)
instead of the megaAvr core. It has more features, is better maintained, and certainly supports all the register syntax of the AT4809.

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Thanks again - I'll certainly take a look :slight_smile:

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Typically you'd want C:\Users\*YourUserName*\AppData\Local\Arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino7\avr\include\avr\iom4809.h

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