SAMD21G disabling TX LED pin blinking (feather M0 bootloader)

Projects Programming
1

Howdy,

I'm making custom board from SAMD21G chip. I need TX pin (PA27) to be as an output. I can do that easily, but if I use serial that pin gets messed up. I'm pretty sure that reason for it is that it's used by core or by bootloader as TX LED to represent data transfer.
So, my question is how to disable this data transfer override? I need to change core or bootloader?
I'm using Adafruit bootloader and core (Feather M0).

Thank you for your time and knowledge.

2

Probably the easiest way to achieve this is to define your own variant and there undefine PIN_LED_TXL. Otherwise you have to change a lot of code.