[ESP32-S2] Enable UART REPL instead of USB

[rx8pilot]

I have created a custom board with ESP32-S2-WROVER-I. Using an external serial adaptor for programming. I am new to ESP32 and Micropython, but a mid-skill-level programmer for many other microcontrollers.

The GENERIC-S2 port compiled just fine, but it appears to be setup for USB REPL. I can see the system boots, but no interaction on UART.
Next, I tried to simply delete the .usb line in mpconfigboard.h

Code: Select all

set(IDF_TARGET esp32s2)

set(SDKCONFIG_DEFAULTS
    boards/sdkconfig.base
    boards/sdkconfig.usb
)

if(NOT MICROPY_FROZEN_MANIFEST)
    set(MICROPY_FROZEN_MANIFEST ${MICROPY_PORT_DIR}/boards/manifest.py)
endif()

It compiles without error, but the microcontroller panics during boot, endless reboots. So, I put the .usb line back in and tried to modify the sdkconfig.usb file:

Code: Select all

CONFIG_USB_ENABLED=n
CONFIG_USB_CDC_ENABLED=n
CONFIG_USB_CDC_RX_BUFSIZE=256
CONFIG_USB_CDC_TX_BUFSIZE=256

Again, it compiles without errors but panics the microcontroller. Clearly I am just hacking away at this blindly.
Is anyone able to point me in the right direction to get the REPL on the UART?

[rx8pilot]

UART0 Output:
Looping on boot, but only when I take out the USB lines or change the sdkconfig.board file.

Hard to say if I am doing something wrong, or if I am fighting a bug.

Code: Select all

ESP-ROM:esp32s2-rc4-20191025
Build:Oct 25 2019
rst:0xc (RTC_SW_CPU_RST),boot:0x8 (SPI_FAST_FLASH_BOOT)
Saved PC:0x4002547a
SPIWP:0xee
mode:DIO, clock div:1
load:0x3ffe6100,len:0xf48
load:0x4004c000,len:0xaec
load:0x40050000,len:0x2bd4
entry 0x4004c1b0
Guru Meditation Error: Core  0 panic'ed (StoreProhibited). Exception was unhandled.

Core  0 register dump:
PC      : 0x400d27c2  PS      : 0x00060333  A0      : 0x8008635c  A1      : 0x3ffd5b90
A2      : 0x00000000  A3      : 0x00000000  A4      : 0x3ff9ffe0  A5      : 0x0000040e
A6      : 0x3ffd5bc0  A7      : 0x3ffc7ebc  A8      : 0x00000000  A9      : 0x3ffd5b60
A10     : 0x00000000  A11     : 0x0000040e  A12     : 0x40026a54  A13     : 0x00000000
A14     : 0x3ffd5bc0  A15     : 0x3fffde84  SAR     : 0x00000014  EXCCAUSE: 0x0000001d
EXCVADDR: 0x00000008  LBEG    : 0x40026a54  LEND    : 0x00000000  LCOUNT  : 0x40026521


Backtrace:0x400d27bf:0x3ffd5b900x40086359:0x3ffd5bc0 0x400861dc:0x3ffd5bf0




ELF file SHA256: cf70f28091c5e26c

Rebooting...

I tried reverting back to 1.18 but that has not yet been any help.

[rx8pilot]

There was a bug in the the UART init function.

The latest release seems to have solved it.