Some notes on using VietArduino board
https://github.com/productmakerlabvn/Vietduino-WiFi-BLE-ESP32/blob/main/README.md
Some Problems on macOS when trying with this board (you only be stupid once!)
First problem - wrong wiring causing unable to upload software into the board
This was the error
Sketch uses 904416 bytes (69%) of program storage space. Maximum is 1310720 bytes.
Global variables use 45788 bytes (13%) of dynamic memory, leaving 281892 bytes for local variables.
Maximum is 327680 bytes. esptool.py v4.8.1
Serial port /dev/cu.usbserial-10 Connecting......................................
A fatal error occurred: Failed to connect to ESP32:
No serial data received.
For troubleshooting steps visit: https://docs.espressif.com/projects/esptool/en/latest/troubleshooting.html
Failed uploading: uploading error: exit status 2
Fixed by remove all wiring and troubleshoot one-by-one
Second error - Flashing error after removing wiring
Connecting......
Chip is ESP32-D0WD-V3 (revision v3.0)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
WARNING: Detected crystal freq 41.01MHz is quite different to normalized freq 40MHz. Unsupported crystal in use?
Crystal is 40MHz
MAC: b8:d6:1a:be:a2:40
Uploading stub...
Running stub...
Stub running...
Changing baud rate to 921600
Changed.
A fatal error occurred: Unable to verify flash chip connection (Packet content transfer stopped (received 7 bytes)).
Failed uploading: uploading error: exit status 2
Fixed by changing upload speed to 115200
