SPI not working with MBED (was: Performance of XIAO with Sharp Memory Display)

Products & Technology XIAO
20

I used the pins as follows:
D10 for MOSI
D8 for SCK
D4 for SS/CS

You are using pins other than D10 and D8 for MOSI and SCK, right?

Since OLED is working, what about the proposal to change Sharp to OLED?
I bought 128X64 for less than $10.