esptool: error: argument operation: invalid choice: '{upload.flags}' about esp32-ic705bt-pa

[dl1bz]

No, you didn't.
Look here for solution: https://forum.arduino.cc/t/how-to-display-image-on-ttgo-t-display-esp32/1174923

First answer is the solution:
"There were two lines missing in .arduino15/packages/esp32/hardware/esp32/2.0.14/boards.txt:
lilygo_t_display.upload.flags=
lilygo_t_display.upload.extra_flags="
Add the two lines and I'm sure, the esptool works after this.

The second way is using simply ESP32dev as board.

73 Heiko, DL1BZ

[SteffenLav]

That was it - now working!
Thanks Heiko

73 Steffen de OZ1LAV

[dl1bz]

Maybe an issue in the ESP32-SDK from Espressif. The other option is simply using an ESP32-Dev board as selection. That was working here without patching the boards.txt.

Also attention with the Lib TFT_eSPI. I was using only this here: https://github.com/Xinyuan-LilyGO/TTGO-T-Display/tree/master/TFT_eSPI. With the other, newer Lib I had some problems with the T-DISPLAY. Beware, the Arduino IDE will make an update of this older lib, so don't do it ! Thats only important if you use only the LILYGO T-DISPLAY v1.1.
Next, with the newer S3-versions of ESP32 you lost classical Blutooth, start from S3 there are only Bluetooth LE possible and will NOT work with my code. You need BT-profile SPP, BT-LE hasn't ! BT classical and BT LE are two complete different things. LE is client-server based and need a complete new codebase for BT with the 705. But in the meantime I changed from 705 to Hermes-Lite 2 and so this project is no more needed by me. My XPA125B is now my PA for the Hermes-Lite 2. I develop another project with an ESP32 (in this case with an ESP32-S3) too for using the XPA125B with the Hermes-Lite 2 and the automatic bandswitching with bandvoltage for the XPA125B. Output voltage is the same, but input differs from the 705 with the Hermes-Lite 2, BT is no more needed.
The using of TFT display was only a gimmick, but for practical use it's not needed.

73 Heiko, DL1BZ