/stm32_arduino_van_bus

Vehicle Area Network (VAN bus) reader/writer for STM32F103 (BluePill)

Primary LanguageC++GNU General Public License v3.0GPL-3.0

Vehicle Area Network (VAN bus) Reader/Writer for STM32

Description

VAN bus is pretty similar to CAN bus. It was used in many cars (Peugeot, Citroen) made by PSA from 2001 to 2005.

This is a VAN bus library for the STM32 boards. It was developed on a STM32F103 BluePill, but it should work with other STM32 based boards as well. It supports reading and also writing to the bus. It works on the 125 kbits/sec bus (VAN_COMFORT), and the 62.5 kbits/sec bus (VAN_BODY) as well (however only reading was tested on the BODY bus)

It doesn't support boards other than the STM32 family yet, but it shouldn't be difficult to add a new board which is powerful enough. For other boards like the ESP32, ESP8266 or a generic SPI library with a TSS463 IC you can find libraries in the See also section.

Schematics

schema

Example

#include <Arduino.h>
#include <stm32_arduino_van_bus.h>

Stm32ArduinoVanBus* vanBus;
uint32_t prevTime = 0;
	
void setup()
{
    Serial.begin(500000);

    vanBus = new Stm32ArduinoVanBus();
    vanBus->Init(PA6, PA7, PC13, VAN_LINE_LEVEL_LOW, VAN_NETWORK_TYPE_COMFORT);
}
	
void loop()
{
    uint32_t currTime = millis();
    if (currTime - prevTime > 10)
    {
        prevTime = currTime;

        uint8_t vanMessage[32];
        uint8_t msgLength;
        char tmp[3];

        if (vanBus->Receive(vanMessage, &msgLength))
        {
            if (!vanBus->IsCrcOk(vanMessage, msgLength)) {
                Serial.print("CRC ERROR: ");
            }
            for (int i = 0; i < msgLength; i++)
            {
                snprintf(tmp, 3, "%02X", vanMessage[i]);
                Serial.print(tmp);
                Serial.print(" ");
            }
            Serial.println();
        }
    }
}

Sending data on the VAN bus

Sending has been implemented, but it doesn't really work in a car, so I strongly advise not to use it. However if you can make it reliable, a PR is very welcome. For examples on how to send data on the bus you should check the examples folder.

Sample output

output

Installation

You need to install the official STM32 core based on the info from here: https://github.com/stm32duino/Arduino_Core_STM32#getting-started

Copy the following files to your documents\Arduino\libraries\stm32_arduino_van_bus folder

  • stm32_arduino_van_bus.h
  • stm32_arduino_van_bus.cpp
  • keywords.txt
  • library.properties

Don't forget to install the RingBuffer library from the next section as well!

Used library

You need to have the following library installed:

Thanks

A HUGE thanks goes to XuHaojie for his work. His STM32 standard peripheral library was the base of this Arduino library.

See also