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MCUdude / MegaCore

Arduino hardware package for ATmega64, ATmega128, ATmega165, ATmega169, ATmega325, ATmega329, ATmega640, ATmega645, ATmega649, ATmega1280, ATmega1281, ATmega2560, ATmega2561, ATmega3250, ATmega3290, ATmega6450, ATmega6490, AT90CAN32, AT90CAN64 and AT90CAN128
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Trouble uploading sketch to Arduino Mega2560 after burning bootloader #199

Closed ChadMatsalla closed 1 year ago

ChadMatsalla commented 1 year ago

Hi there,

I think this is a documentation issue. I'm using a two Genuine Arduino Mega2560s. Not a bare chip or clone board.

Once the bootloader is flashed onto a to a target (the LED on the target board is flashing twice when it's powered up) how do I flash a sketch onto the modified board? https://github.com/MCUdude/MegaCore/issues/186#issuecomment-1145598684 seems to indicate that I can use the on-board USB-Serial but no combination of avrdude commands will do anything for me.

Am I correct that this is the correct command? The compiled sketch is blink.

"/Users/chad/Library/Arduino15/packages/MegaCore/tools/avrdude/7.1-arduino.1/bin/avrdude" "-C/Users/chad/Library/Arduino15/packages/MegaCore/hardware/avr/2.2.2/avrdude.conf" -v -V -patmega2560 -carduino -P/dev/cu.usbmodem14101 -b57600 -D "-Uflash:w:/private/var/folders/xp/5lxl6k0x53lcbnc9_6gj0ty80000gt/T/arduino/sketches/D8B38F946CD2265AE6A4FA11724A97CA/Blink.ino.hex:i"

I've tried absolutely everything and I can provide considerable detail. Before I do that I'm just wondering if there's something blindingly obvious I'm missing.

Thank you,

Chad Matsalla

ChadMatsalla commented 1 year ago

I'm writing this as a courtesy to anybody who comes up against this. The correct baud rate for me was 115200. Thanks!