Can't flash an ESP32-S2

[pythoncoder]

Will do. Before I do I'm still puzzled by this and have a couple of questions.

With a USB interface on GPIO19 and 20 would I be able to flash firmware on that port?

Given that the chip supports USB natively, why have Espressif implemented a USB-UART bridge?

[russ_h]

Given that the chip supports USB natively, why have Espressif implemented a USB-UART bridge?

The native USB has some limitations (https://docs.espressif.com/projects/esp ... nsole.html) that could be annoying during development. One advantage is using the native USB with a debugger without affecting the serial console.

[pythoncoder]

Thank you - very informative.

[pythoncoder]

@ash10 I have raised this issue.

[ash10]

With a USB interface on GPIO19 and 20 would I be able to flash firmware on that port?

I tried to flash firmware via GPIO19/20 and it works but the REPL still doesn't come up on the ESP-IDF interface, even after hard reset.
It comes up as a COM port which you can connect to with a terminal application (I used PuTTY initially and I could access the terminal).

Currently I'm using Thonny and it works well for uploading/running code as well as accessing the internal file system with a GUI interface (which is convenient). I also tried to flash firmware via Thonny, but this didn't work and the COM port on GPIO19/20 disappeared. So I had to flash again using ESP-IDF and the COM port returned on GPIO19/20.

I also tried uPyCraft which was quite unstable and tried the Pymakr plugin for VSCodes which would work on and off sporadically for accessing the REPL but I couldn't upload/download/run any code.

So, currently, the most reliable way of using MicroPython on the S2 board I am working on, is to flash MicroPython via ESP-IDF and then use Thonny to access the REPL or upload/download/run code. Note: the COM port name differs in upload mode (IO0 pulled to ground) and normal use mode.

@ash10 I have raised this issue.

Thank you

[dk2jk]

Hello,
I have the same problem. Board is: ESP32-s2-soala-1 , chip esp32-s2-wrover.
Flashing with Thonny seems to work:
.../thonny/bin/python3.7 -u -m esptool --port /dev/ttyUSB0 write_flash --flash_mode keep --flash_size detect 0x1000 /home/dk2jk/Downloads/ESP32_S2_WROVER-20220117-v1.18.bin
esptool.py v3.1
Serial port /dev/ttyUSB0
Connecting....
Detecting chip type... ESP32-S2
Chip is ESP32-S2
Features: WiFi, ADC and temperature sensor calibration in BLK2 of efuse
Crystal is 40MHz
MAC: 7c:df:a1:06:98:ea
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Auto-detected Flash size: 4MB
Flash will be erased from 0x00001000 to 0x0012bfff...
Compressed 1222704 bytes to 806301...
Writing at 0x00001000... (2 %)
Writing at 0x00012557... (4 %)
...
Writing at 0x00129b5b... (100 %)
Wrote 1222704 bytes (806301 compressed) at 0x00001000 in 71.5 seconds (effective 136.7 kbit/s)...
Hash of data verified.

Leaving...
Done!

Close !


After Push Reset Button :

ESP-ROM:esp32s2-rc4-20191025
Build:Oct 25 2019
rst:0x1 (POWERON),boot:0x8 (SPI_FAST_FLASH_BOOT)
SPIWP:0xee
mode:DIO, clock div:1
load:0x3ffe6100,len:0xf48
load:0x4004c000,len:0xaec
load:0x40050000,len:0x2bd4
entry 0x4004c1b0

Is there a new binary file, correcting the REPL problem ?

with regards
Heribert

[Roberthh]

For a strange reason, on these boards REPL appears only at the UART port. You can as well try to install the most recent daily build. On my feathers2 board it has a REPL at USB.

[wangshujun@tom.com]

It seems that you have successfully refreshed the mpy firmware, but repl is on the USB port. You can recompile the firmware and cancel the USB option

[dk2jk]

"You can recompile the firmware and cancel the USB option"

Sorry , it may be simple, but
how do you do that ?
with regards

Update: the problem is solved. With the newest binfile for esp32-s2 '
the serial port starts as expected. No compiling necessary...