After uploading the program using python app, the program is not running. (Arduino Mega with Optiboot bootloader)

[mluthfialhadi]

I have burn optiboot botloader from MCUdude MegaCore Optiboot Bootloader for my Arduino Mega 2560 using another arduino nano as isp.
I was able to upload the program using the python app. It is only "blink" program.

But the program is not running, then I checked using avrdudess (arduino nano as isp) to verify the program. Avrdudess even cannot detect the Atmega2560.

Sorry for my bad english.

[JayLooi]

Hi @mluthfialhadi ,

Thank you for your interest in this application. I sincerely apologise for the delayed response and appreciate your patience.

Findings:

• Turns out that the flash page size of Arduino Mega2560 is 256 bytes as identified from the avrdude.conf
  https://github.com/MCUdude/MegaCore/blob/8b5f16e1da21b6c3014d9accd3bb801a07ed1938/avr/avrdude.conf#L9284-L9288
• My current implementation in ArduinoOTAFirmwareUpdater.cpp is just working for page size less than 256 bytes as shown in the snippet below.
  

  RemoteArduino/ESP8266_Interface/ArduinoOTAFirmwareUpdater/ArduinoOTAFirmwareUpdater.cpp

  Lines 42 to 47 in 25b313d

  	if(_waitOptibootRes_1s()) {
  	Serial.write(0x64);
  	Serial.write(0x00);
  	Serial.write(len);
  	Serial.write(0x46);

• In fact, the bootloader will erase the flash page (256 bytes for the case of Arduino Mega2560) before writing to it. So whenever we try to flash the program in 128-byte chunk (which is the default defined in ArduinoRemote.py), the bootloader will erase the same flash page twice for every 256 bytes. In other words, for every two 128-byte chunks of hex transferred to bootloader, the first one will be erased before the second one being flashed.

Having identified this, I made a quick change in this branch. But unfortunately, I don't have an Arduino Mega with me so I couldn't test it out.
You may pull this feature branch and try it. Do remember to update the line below to 256.

RemoteArduino/Host/ArduinoRemote.py

Line 6 in 25b313d

HEX_BUFF_SIZE = 128

Please let me know if you encounter any issue in the quick fix above.