Trouble with I2C on ESP32C3

[OldManArduino]

Hi.
I have a Waveshare ESP32-C3-LCD-1.47 development board. It includes a QMI8658 IMU. I know the IMU works because the board shipped with a demonstration program (no source code) that showed as much. But my efforts to access the IMU have failed. It seems the simplest I2C operations result in error 4 "other error". Are there some special requirements for doing I2C on an ESP32C3 board? Is there a tutorial on the subject? Thanks.

[horace99]

have a look at https://docs.waveshare.com/ESP32-C3-LCD ... -Documents

[OldManArduino]

Thanks Horace. That is useful information. I've also found this
https://docs.espressif.com/projects/esp ... s/i2c.html
It'll take me a while to absorb it all, but it explains i2c_master.h, and how to create instances of
i2c_master_bus_handle_t That seems to be what I need to learn.