/* * Author: Jon Trulson * Copyright (c) 2016 Intel Corporation. * * This program and the accompanying materials are made available under the * terms of the The MIT License which is available at * https://opensource.org/licenses/MIT. * * SPDX-License-Identifier: MIT */ var sensorObj = require('jsupm_mcp2515'); // Instantiate a MCP2515 on SPI bus 0 using a hw CS pin (-1). var sensor = new sensorObj.MCP2515(0, -1); // set the mode to loopback mode. In loopback mode, transmitted // packets are sent directly to an appropriate receive buffer // without actually going out onto the CAN bus. sensor.setOpmode(sensorObj.MCP2515_OPMODE_LOOPBACK); // lets build up a packet and try loading it (8 bytes max). var myPayload = "01234567"; console.log("Loading a packet of 8 numbers (0-7) into a TX buffer..."); sensor.loadTXBuffer(sensorObj.MCP2515_TX_BUFFER0, 0, false, false, myPayload); // now lets try to transmit it console.log("Transmitting packet..."); sensor.transmitBuffer(sensorObj.MCP2515_TX_BUFFER0, true); console.log("Transmit successful"); // There should now be a packet waiting for us in RXB0 if (sensor.rxStatusMsgs() == sensorObj.MCP2515_RXMSG_RXB0) { console.log("Packet received in RXB0, decoding..."); // now lets retrieve and print it sensor.getRXMsg(sensorObj.MCP2515_RX_BUFFER0); sensor.printMsg(); } else { console.log("No packet found, how strange."); } console.log("Exiting..."); sensor = null; sensorObj.cleanUp(); sensorObj = null; process.exit(0);