Ucglib.h and SPI.h interfering

Other Hardware Displays
1

Using an esp32 C3 to drive a display with ucglib.h. at the same time I'm controlling some attenuators using SPI.h - different CS lines.

All works fairly well but I want to slow down the SPI clock for the attenuators.

So, I use SPI.beginTransaction(SPIsettings(1000000, MSBFIRST, SPI_MODE0));
and SPI.endTransaction();

As soon as I introduce these the ucglib control of the display fails regardless of what settings I have in the SPIsettings.

The two libraries seem to be upsetting each other. Any way round this?

Don't have enough pins on the C3 to implement 2 busses.

2

Does the attenuator send data back? Does it use MISO? Some SPI devices don't honor CS and will assert MISO regardless.

3

No data coming back.

Note that its all actually working its just that Id like to slow down the SPI but as soon as I set it to anything there seems to be some conflict. Default SPI clock is 10MHz (Measured) even if I try to set it to 10MHz it all goes wrong.

4

Ah, I missed that. I'd inspect the source code for that library and see if your settings are conflicting with how it wants to be configured.