How to read data from a serial (SPI) connection in C?

Question

I am trying to write a program that will be installed on a Linux MCU (Raspberry Pi) that will read serial data coming to it from yet another MCU (something homegrown that I will

Answer 1

Have you find Linux documentation of SPI ?

There are couple good documents: spi-summary and spidev.

There is also example in file spidev_fdx.c, where read() is used for SPI device.

But usually reading from SPI is handled by ioctl() function.