Hi I am unable to upload sketch to Atmel mega1284p using a mcp2221 usb to uart converter IC.
I have a simple code prints "message received" It works to program the Mega1284p using arduino nano as ISP. But not using the MCP2221 over usb. I took a long time and eventually errors out. I tried pressing reset button on ATMega while uploading, I tried swapping TX and RX. I double checked COM port. Please help.
System wide configuration file is "C:\Users\hhuynh\AppData\Local\Arduino15\packages\MightyCore\hardware\avr\2.0.1/avrdude.conf" Using Port : COM5 Using Programmer : arduino Overriding Baud Rate : 38400
An error occurred while uploading the sketch
This is my setup.
This schematic is simular to how mine is setup.