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ESP32R4 controller firmware update.
Update over the serial connection using a serial-to-USB adapter: CH340, FTDI FTR232, CP2102/2104, PL2303…
Some adapters can be switched between 3.3V and 5V for the data pins, but still provide 5V on the power pin which will irreparably destroy your device. You MUST make sure the data (RX and TX) logil level 3.3V and VCC pins are set for 3.3V.
| Serial adapter | ESP32R4 |
|---|---|
| 3.3V | 3.3 or use power from the board |
| TX | RX |
| RX | TX |
| GND | GND |
ESP32R4 needs to be put into programming mode before the firmware can be uploaded:
- Push the button PROG;
- Push the button RST;
- After 1-second release button RST;
- Release button PROG;
- After uploading firmware push the button RST.