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82 lines
2.3 KiB
JavaScript
82 lines
2.3 KiB
JavaScript
/*
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* Author: Jon Trulson <jtrulson@ics.com>
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* Copyright (c) 2016 Intel Corporation.
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*
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* This program and the accompanying materials are made available under the
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* terms of the The MIT License which is available at
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* https://opensource.org/licenses/MIT.
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*
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* SPDX-License-Identifier: MIT
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*/
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var sensorObj = require('jsupm_mcp2515');
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// Instantiate a MCP2515 on SPI bus 0 using a hw CS pin (-1).
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var sensor = new sensorObj.MCP2515(0, -1);
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// NOTE: This example assumes that only two devices are connected
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// to the CAN bus, and that both devices are running this example;
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// one in TX (transmit) mode, and one in RX (receive) mode.
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// If this is not the case, then in rx mode you may see other
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// packets from other devices, or not, depending on whether the
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// speed is correct for the network. In tx mode, errors may be
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// generated on the bus, especially if the CAN bus speed does not
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// match the rest of the network.
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// You should start the receiver example first. The transmitter
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// example will fail after about 5 seconds (timeout) of not being
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// able to transmit a message.
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function transmit(sensor)
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{
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// lets build up a packet and try loading it (8 bytes max).
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var myPayload = "01234567";
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console.log("Loading a packet of 8 numbers (0-7) into a TX buffer...");
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sensor.loadTXBuffer(sensorObj.MCP2515_TX_BUFFER0,
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0, false, false, myPayload);
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// now lets try to transmit it
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console.log("Transmitting packet...");
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sensor.transmitBuffer(sensorObj.MCP2515_TX_BUFFER0, true);
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console.log("Transmit successful");
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console.log();
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}
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function receive(sensor)
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{
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// There should now be a packet waiting for us in RXB0
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if (sensor.rxStatusMsgs() == sensorObj.MCP2515_RXMSG_RXB0)
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{
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console.log("Packet received in RXB0, decoding...");
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// now lets retrieve and print it
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sensor.getRXMsg(sensorObj.MCP2515_RX_BUFFER0);
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sensor.printMsg();
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console.log();
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}
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}
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// by default we just receive packets
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if (process.argv.length > 2)
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{
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// transmit mode
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interval = setInterval(function() { transmit(sensor); }, 500);
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}
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else
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{
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// receive mode
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interval = setInterval(function() { receive(sensor); }, 100);
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}
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process.on('SIGINT', function()
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{
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sensor = null;
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sensorObj.cleanUp();
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sensorObj = null;
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console.log("Exiting...");
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process.exit(0);
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});
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