upm/examples/c/mcp2515.c

108 lines
3.3 KiB
C
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.
*/
#include <unistd.h>
#include <stdio.h>
#include "mcp2515.h"
int main(int argc, char **argv)
{
//! [Interesting]
#if defined(CONFIG_BOARD_ARDUINO_101)
// ARDUINO_101 (Quark core) where you must use SPI
// Instantiate a MCP2515 instance using default SPI bus and pin 10 as CS
mcp2515_context sensor = mcp2515_init(0, 10);
#else
// Instantiate a MCP2515 on SPI bus 0 using a hw CS pin (-1).
mcp2515_context sensor = mcp2515_init(0, -1);
#endif
if (!sensor)
{
printf("mcp2515_init() failed\n");
return 1;
}
printf("Setting loopback mode...\n");
// 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.
if (mcp2515_set_opmode(sensor, MCP2515_OPMODE_LOOPBACK))
{
printf("mcp2515_set_opmode(loopback) failed.\n");
return 1;
}
// lets build up a packet and try loading it.
uint8_t myPayload[8] = {0, 1, 2, 3, 4, 5, 6, 7};
printf("Loading a packet of 8 numbers (0-7) into a TX buffer...\n");
if (mcp2515_load_tx_buffer(sensor, MCP2515_TX_BUFFER0, 0, false, false,
myPayload, 8))
{
printf("mcp2515_load_tx_buffer() failed\n");
return 1;
}
// now lets try to transmit it
printf("Transmitting packet...\n");
upm_result_t rv = 0;
if ((rv = mcp2515_transmit_buffer(sensor, MCP2515_TX_BUFFER0, true)))
{
printf("mcp2515_transmit_buffer() failed with code %d\n", rv);
return 1;
}
printf("Transmit successful\n");
// There should now be a packet waiting for us in RXB0
if (mcp2515_rx_status_msgs(sensor) == MCP2515_RXMSG_RXB0)
{
printf("Packet received in RXB0, decoding...\n");
// now lets retrieve it
MCP2515_MSG_T msg;
if (mcp2515_get_rx_msg(sensor, MCP2515_RX_BUFFER0, &msg))
{
printf("mcp2515_get_rx_msg() failed\n");
return 1;
}
mcp2515_print_msg(sensor, &msg);
}
else
{
printf("No packet found, how strange.\n");
}
printf("Exiting...\n");
mcp2515_close(sensor);
//! [Interesting]
return 0;
}