Big ESP32 + SX127x topic part 3

[blem (Manuel Bl)]

@bluejedi

Where is the crystal frequency parameter used in your library (where does it play a role)?
I haven’t noticed something similar for Arduino LMIC. Could the crystal speed (difference) be related to those timing issues?

I don’t have an Arduino IDE to check at the moment. But if I remember correctly, the XTAL frequency is mentioned in the Tools menu where you select and cofigure your board.

Also from memory: The ESP-IDF framework provides a function to estimate the XTAL frequency and the Arduino framework uses it to simplify usage. The default in ESP-IDF however is to set it explicitly.

If you somehow configure the XTAL frequency incorrectly, serial communication will only transmit gibberish. So it’s quite obvious if it’s incorrect and therefore it can’t be the cause of LMIC timing issues.