Not an issue but a question regarding the regAddr-parameter

[alphaWave]

First of all, thanks very much for this, makes the ESP's SPI a lot more accessible for a beginner like myself.

Some context: The use-case is controlling a DotStar LED-strip with my ESP32. As of now, the DotStar-library only exists for Arduino, so I'm in the process of refactoring it for ESP-IDF. At this point, I can control the LEDs using bitbanging, but it would be neat to be able to do the same via SPI.

It's all fairly straightforward thanks to your example until I reach the regAddr-parameter in the writeByes()-function. The way I see it, I just want to send some data to the MOSI-pin and don't need to specify a register to write to. Am I wrong? Could you give me a hint how to proceed?