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The mcp2515 is a CAN bus controller. It was developed using the Seeed CAN bus shield. Signed-off-by: Jon Trulson <jtrulson@ics.com>
67 lines
2.3 KiB
JavaScript
67 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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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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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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// set the mode to loopback mode. In loopback mode, transmitted
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// packets are sent directly to an appropriate receive buffer
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// without actually going out onto the CAN bus.
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sensor.setOpmode(sensorObj.MCP2515_OPMODE_LOOPBACK);
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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, 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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// 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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}
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else
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{
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console.log("No packet found, how strange.");
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}
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console.log("Exiting...");
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sensor = null;
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sensorObj.cleanUp();
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sensorObj = null;
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process.exit(0);
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