• Introduction
  • Hardware Setup
  • Software setup
  • Running the Demos
    • MAX7219: C

Introduction

This guide will walk you through Interfacing with Raspberry Pi HATs that use SPI bus.

Hardware Setup

• Any 96Boards CE Board
• Shiratech FPGA Mezzanine
• Simple SPI HAT
  • For the Purpose of this guide I will be using:
    • MAX7219 LED Matrix HAT

Software setup

• Install MRAA on 96Boards CE
• Install UPM on 96Boards CE

Running the Demos

• The SPI ports on the Raspberry Pi headers act as a pass-through to the I2C0 Pins on the Low Speed Header.
• We first need to enable the spi pass-through: sudo i2cset 0 0x6f 0x3a 0x00
• This means and device connected over spi via the FPGA Mezzanine should be available on /dev/spidev0.0/.

MAX7219: C

For the MPU6050, we are going to use one of the example codes from the MRAA repository:

• Fetch the code: wget https://raw.githubusercontent.com/intel-iot-devkit/mraa/master/examples/c/spi.c
• Compile the code: gcc spi.c -o spi -lmraa
• Run the code: sudo ./spi
• You should see all the LEDs in the Matrix light up one by one.