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Boot loop on ESP32-C3

See original GitHub issue

I am using the feature/arduino-idf-master and the arduino framework for ESP32-C3. At one point this used to work, but sometime in early August it seems something broke. Today I had a chance to look a bit more closely, and it seems that the current board config for esp32-c3-devkitm-1 leads to a boot loop (at least on my board):

ESP-ROM:esp32c3-api1-20210207
Build:Feb  7 2021
rst:0x10 (RTCWDT_RTC_RST),boot:0xc (SPI_FAST_FLASH_BOOT)
SPIWP:0xee
mode:QIO, clock div:1
load:0x3fcd6100,len:0x1428
ets_loader.c 78 
ESP-ROM:esp32c3-api1-20210207
Build:Feb  7 2021
rst:0x7 (TG0WDT_SYS_RST),boot:0xc (SPI_FAST_FLASH_BOOT)
Saved PC:0x40049a42
SPIWP:0xee
mode:QIO, clock div:1
load:0x3fcd6100,len:0x1428
ets_loader.c 78

It seems that using DIO via:

board_build.flash_mode = dio

does resolve the issue. I am pretty sure however that QIO at one point worked…

Issue Analytics

State:
Created 2 years ago
Reactions:1
Comments:20 (2 by maintainers)

Top GitHub Comments

2reactions

agnerscommented, Feb 23, 2022

@lukedukeus setting board_build.flash_mode explicitly works around the problem:

esphome:
  ...
  platformio_options:
    board_build.flash_mode: dio

0reactions

Jason2866commented, Nov 11, 2022

@andychess Seems the board uses the inbuilt USB modem (CDC). Use a C3 boards json which is a CDC device too, or set the mode to use CDC for serial output manually.