spi-sniffer's Introduction

SPI sniffer project

Board: NUCLEO-L432KC, but should work on any STM32L4 board (and any STM32 with slight modifications)
Pins used:
- PB4 (D12): SPI MISO
- PB5 (D11): SPI MOSI
- PB6 (D5): SPI CLK
- PB7 (D4): SPI NSS
Serial baud rate: 2 000 000 bits/s

Project Purpose

This project is built to connect to an SPI network and process any data sent through it in a transparent way. It's useful for debugging SPI device issues.

Important Notes

Set your SPI speed to a really low one. Since a lot of data needs to be transferred via UART, decreasing the speed of your SPI network makes sure that all bits are caught in time.
This project currently supports SPI mode 0 (CPOL=0, CPHA=0).

Details

This project was built in STM32CubeMX for the Atollic TrueStudio IDE. If you load the project in STM32CubeMX, you can export it to use any other IDE of your choice.
This project sets the processor clock to 80 MHz, the highest one achievable, so that the SPI data can be processed as fast as possible.
The serial output contains colours. If your terminal doesn't support colours, you might see garbled characters.
USART2 is used to output the data. The NUCLEO board will automatically send this data over USB. Alternatively, you can connect an FTDI232 USB-to-Serial converter on pin PA2 to receive the data. Note that you have to use a converter that supports a baud rate of 2 Mbits/sec.

The command I used to open the terminal on linux was:
```
minicom -c on -R utf-8 -b 2000000 -D /dev/ttyACM1
```
The HAL driver is used, but all the necessary driver files are included in the Drivers folder.