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.

Important files

• Src/main.c: The source code of the project
• spi-sniffer.ioc: Open this file inside STM32CubeMX to edit the project.

Screenshot