Arduino_SPI_bridge is a small Arduino project to configure an Arduino as USB<->SPI gateway. The main objective for this project was to provide a OS-independent SPI-gateway for the stm8gal application. However, since the SPI can be freely configured, it should also work for other SPI slave devices.
Basically Arduino_SPI_bridge is remotely controlled via USB command using a simple UART protocol (for details see 'protocol.ods'). So far it has only been tested with an Arduino UNO (old ATMega type) and a Due (new CortexM type), but other boards shord work as well.
To test the functionality, a small Python project is also provided. Provided that Python and PySerial are installed, it should be compatible with Windows, MacOS X and Linux, including Raspbian.
For bug reports or feature requests please send me a note.
Have fun! Georg
- Arduino_SPI_bridge and it's source code is distributed under the Apache License Version 2.0 (see License)
Open 'SPI_bridge/SPI_bridge.ino' in the Arduino IDE, build and upload to the Arduino board.
Arduino_SPI_bridge waits for commands via USB and reacts accordingly. Frame syncronization is via inter-frame time (>1ms). The simple command and response protocol is (also see 'protocol.ods')
An example of protocol and possible error handling is given in 'Arduino_SPI_bridge.py'. This file can also be imported into bigger Python programs.
- before connecting different devices, please assert compatible voltage levels. Specifically, to avoid damage never expose a 3.3V device to 5V signals
- the initial version of Arduino_SPI_bridge used the NeoHWSerial library, which allows custom UART interrupt handlers. To also support newer Arduinos with 3.3V I/Os, protocol handling is now by serialEvent(), which uses polling. Therefore timing is much more critical, though no issue was found so far.
v1.2.0 (2024-07-07)
- shift CSN configuration from sen/receive to config
- some cosmetic changes
v1.1.0 (2018-12-07)
- changed protocol handler from NeoHWSerial to serialEvent() for compatibility with non-ATMega based Arduinos
v1.0.1 (2017-12-22)
- fixed bug in conjunction with stm8gal (see https:/gicking/stm8gal)
v1.0.0 (2017-12-21)
- initial release by Georg Icking-Konert under the Apache License 2.0