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canbus-interpreter

A simple library that allows encoding and decoding of canbus signals from messages

Installation

  • Install Flexcan dependency from https://github.com/collin80/FlexCAN_Library
  • Download latest release .zip file or click code > download zip
  • In Arduino IDE go to Sketch > Include Library, select the .zip file you just downloaded

Usage

An example is provided with library (File>Examples)

Initialise

Create an instance of the class:

CANBUS canbus;

Decoding CAN signals

Call the decode method of the canbus class:

canbus.decode(CAN_message_t msg, int startBit, int bitLength, String byteOrder, String dataType, double Scale, double bias)`

For example

canbus.decode(inMsg, 14, 16, "LSB", "SIGNED", 0.5, -2)`

returns a variable of data type double with the requsted signal details

Encoding CAN signals

Call the encode method of the canbus class:

canbus.encode(CAN_message_t msg, double inputData, int startBit, int bitLength, String byteOrder, String dataType, double Scale, double bias)

Be sure to create an empty message beforehand with relevant ID and length. The function returns a CAN_message_t data type allowing the encodeCAN method to be called multiple times to pack several signals into one message

outMsg.id  = 0x025;
outMsg.len = 8;
outMsg.ext = 0;
outMsg.buf[0] = 0x00;
outMsg.buf[1] = 0x00;
outMsg.buf[2] = 0x00;
outMsg.buf[3] = 0x00;
outMsg.buf[4] = 0x00;
outMsg.buf[5] = 0x00;
outMsg.buf[6] = 0x00;
outMsg.buf[7] = 0x00;
outMsg = canbus.encode(outMsg, tempint, 3, 12, "MSB", "SIGNED", 1.5, 0);`