upm/examples/c++/mcp2515.cxx

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/*
* 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.
*/
#include <iostream>
#include <string>
#include "mcp2515.hpp"
#include "mcp2515_regs.h"
using namespace std;
int
main(int argc, char** argv)
{
//! [Interesting]
// Instantiate a MCP2515 on SPI bus 0 using a hw CS pin (-1).
upm::MCP2515 sensor(0, -1);
cout << "Setting loopback mode..." << endl;
// 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(MCP2515_OPMODE_LOOPBACK);
// lets build up a packet and try loading it (8 bytes max).
string myPayload = "01234567";
cout << "Loading a packet of 8 numbers (0-7) into a TX buffer..." << endl;
sensor.loadTXBuffer(MCP2515_TX_BUFFER0, 0, false, false, myPayload);
// now lets try to transmit it
cout << "Transmitting packet..." << endl;
sensor.transmitBuffer(MCP2515_TX_BUFFER0, true);
cout << "Transmit successful" << endl;
// There should now be a packet waiting for us in RXB0
if (sensor.rxStatusMsgs() == MCP2515_RXMSG_RXB0) {
cout << "Packet received in RXB0, decoding..." << endl;
// now lets retrieve and print it
sensor.getRXMsg(MCP2515_RX_BUFFER0);
sensor.printMsg();
} else {
cout << "No packet found, how strange." << endl;
}
cout << "Exiting..." << endl;
//! [Interesting]
return 0;
}