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