@rtborg, did you find a solution for your issue?

SOLUTION Using the monoidk/MCP23S08 library fork code I have test code running successfully using two MCP23S08's and two SPI's. I don't need two SPI's to run two expanders, they just demonstrate that the VSPI and HSPI are working at MAX speed of 80Mhz. Thanks to monoidk for their input and MCP23S08...

This is what I have tried so far but getting this compile error: MCP23S08.cpp:25:2: error: 'hspi' was not declared in this scope. Modified Arduino MCP23S08 example... [Codebox=cpp file=Untitled.cpp] /************************************************************************** * * File: SimultanPinAcce...

I have a project which uses a standard TFT Touch Display, SD Card and an MCP23S08 expander chip. All communicating via SPI. The ESP32 is a standard 38 pin devkit module. The TFT Touch Display and SD Card uses VSPI with three CS pins using TFT_eSPI library and the SD library. As VSPI is the default S...

I don't have an answer for you but have been looking into ESP32 SPI and in particular HSPI and came across this in the documentation which you may already be aware of, but may be of interest..."Transfer Speed Considerations" https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/p...