carlosefr / atmega Goto Github PK

I am using an ATMega168A-PU with a 16 MHz external clock.
I was able to upload the bootloader using the ATMega168/168p board.
Do I need to manually modify the fuse bits in boards.txt to configure my microcontroller to use a 16 MHz crystal? Thanks!

Hi
I want to use your code for a stand alone atmeg328p at 8 Mhz intern with Arduino 1.8.8
I included your json files.
A can use my code on an Arduino Version 1.0.5 without problem, I can also use a Arduino Mini oder Nano. All works, but
the code is round about 2kb bigger, or the available flash is only 30700 instead of 32768 when I use this
settings here.

The problem is, all works fine, compiling and uploading, but the chip is dead. It ist just not running.
Not even a simple blink program.
What can go wrong by usings your code?

There are just 2 options
Chip : atmega328p
Clock: 8mhz intern.
Fuses are ok. It works if I use other boards.

I realy would like to use your code, because it gives me 2 kb more flash.
Would be great if you have any idea.
Thank you.
Greatings klaus

atmega328.menu.clock.internal8.bootloader.high_fuses=0xdb

should be

atmega328.menu.clock.internal8.bootloader.high_fuses=0xda

source:
https://docs.arduino.cc/built-in-examples/arduino-isp/ArduinoToBreadboard#minimal-circuit-eliminating-the-external-clock

Hello and thank you for this useful library.
Is there a way to prevent the EEPROM from being erased after each upload ?

I would like to use the updated version of this board definition with the lower external clock speeds (FWIW to be compatible with 3.3V VCC), which I see already exists in master.

In the Arduino IDE 1.6.7 I have not been able to manually install the board definitions from the master .zip file. No matter where I put the files the never seem to appear in the Tools->Board menu.

However the latest IDE still correctly interprets your json definition and updates the packages correcty, so it would be greatly appreciated if you could create a new release and update the json definition accordingly.

To match the configuration of other chips (activating brown-out detection and not saving EEPROM on chip erase), the ATmega8 fuses should probably be changed to these:

atmega8.menu.clock.internal1=1 MHz (internal)
atmega8.menu.clock.internal1.bootloader.low_fuses=0xa1
atmega8.menu.clock.internal1.bootloader.high_fuses=0xcc
atmega8.menu.clock.internal1.build.f_cpu=1000000L

atmega8.menu.clock.internal8=8 MHz (internal)
atmega8.menu.clock.internal8.bootloader.low_fuses=0xa4
atmega8.menu.clock.internal8.bootloader.high_fuses=0xcc
atmega8.menu.clock.internal8.build.f_cpu=8000000L

atmega8.menu.clock.external16=16 MHz (external)
atmega8.menu.clock.external16.bootloader.low_fuses=0xbf
atmega8.menu.clock.external16.bootloader.high_fuses=0xcc
atmega8.menu.clock.external16.build.f_cpu=16000000L

Testing requires access to an ATmega8 chip, which I don't have available right now.

Ref: http://www.engbedded.com/fusecalc/

Hi Carlos,

Any chance that you could add the "PB" variant to your library?

Regards, Martin