upm/examples/java/MCP2515_Example.java

74 lines
2.8 KiB
Java
Raw Permalink Normal View History

/*
* Author: Jon Trulson <jtrulson@ics.com>
* Copyright (c) 2016 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
import upm_mcp2515.MCP2515;
public class MCP2515_Example
{
public static void main(String[] args) throws InterruptedException
{
// ! [Interesting]
// Instantiate a MCP2515 on SPI bus 0 using a hw CS pin (-1).
MCP2515 sensor = new 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(upm_mcp2515.MCP2515_OPMODE_T.MCP2515_OPMODE_LOOPBACK);
// lets build up a packet and try loading it (8 bytes max).
String myPayload = "01234567";
System.out.println("Loading a packet of 8 numbers (0-7) into a TX buffer...");
sensor.loadTXBuffer(upm_mcp2515.MCP2515_TX_BUFFER_T.MCP2515_TX_BUFFER0,
0, false, false, myPayload);
// now lets try to transmit it
System.out.println("Transmitting packet...");
sensor.transmitBuffer(upm_mcp2515.MCP2515_TX_BUFFER_T.MCP2515_TX_BUFFER0,
true);
System.out.println("Transmit successful");
// There should now be a packet waiting for us in RXB0
if (sensor.rxStatusMsgs() == upm_mcp2515.MCP2515_RXMSG_T.MCP2515_RXMSG_RXB0)
{
System.out.println("Packet received in RXB0, decoding...");
// now lets retrieve and print it
sensor.getRXMsg(upm_mcp2515.MCP2515_RX_BUFFER_T.MCP2515_RX_BUFFER0);
sensor.printMsg();
}
else
{
System.out.println("No packet found, how strange.");
}
System.out.println("Exiting...");
// ! [Interesting]
}
}