SG Community Forum

I solved my issue using the UART directly from the Pins P21(TX) and P22(RX). I’ve also deduped UART 1 and use it to communicate with my peripheral.
To monitor with the REPL I’m using /dev/ttyACM0 (Ubuntu system)

By default, MicroPython firmware configures J202 in device mode with an alternate serial REPL.
I would like to disable the REPL on the J202 port and use that USB port to talk to a device (probably in udp)
I tried to disable the REPL using micropython:

1. I loaded a boot.py file with os.dupterm(None,1)
2. I loaded main.py script with uart_usb = machine.UART(0, baudrate=115200)
3. I rebooted the board
4. I opened a terminal with screen /dev/ttyACM0 115200
   The problem is that when I try to call the:

uart_usb = machineUART(0,baudrate=115200)

I get the following error

Guru Meditation Error: Core 1 panic’ed (Interrupt wdt timeout on CPU1).

Core 1 register dump:

PC : 0x40376868 PS : 0x00050034 A0 : 0x4212a396 A1 : 0x3fca2790

A2 : 0x00000208 A3 : 0x3fcf4b80 A4 : 0x40379f50 A5 : 0x3fca2770

A6 : 0x60000000 A7 : 0x00050021 A8 : 0x82014f05 A9 : 0x403845f2

A10 : 0x00060123 A11 : 0x00000000 A12 : 0x00000000 A13 : 0x00000100

A14 : 0x00060023 A15 : 0x00000001 SAR : 0x0000001d EXCCAUSE: 0x00000006

EXCVADDR: 0x00000000 LBEG : 0x00000000 LEND : 0x00000000 LCOUNT : 0x00000000

Core 1 was running in ISR context:

EPC1 : 0x4212aa47 EPC2 : 0x00000000 EPC3 : 0x00000000 EPC4 : 0x40376868

Backtrace: 0x40376865:0x3fca2790 0x4212a393:0x3fcf4b80 0x4201af13:0x3fcf4ba0 0x40385750:0x3fcf4bc0

Core 0 register dump:

PC : 0x4212a396 PS : 0x00060e34 A0 : 0x8201af16 A1 : 0x3fcf4420

A2 : 0x3fca6958 A3 : 0x00060e20 A4 : 0x00060420 A5 : 0x3fcf3930

A6 : 0x00ffffff A7 : 0x00000003 A8 : 0x82014f05 A9 : 0x3fcf4410

A10 : 0x00060e23 A11 : 0x00000000 A12 : 0x00060e20 A13 : 0x3fcf4330

A14 : 0x00060023 A15 : 0x00000003 SAR : 0x0000001d EXCCAUSE: 0x00000006

EXCVADDR: 0x00000000 LBEG : 0x00000000 LEND : 0x00000000 LCOUNT : 0x00000000