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18b8ca2633
Added/updated the shebang line on all python examples with: Also chmod +x a few of the python examples. Signed-off-by: Noel Eck <noel.eck@intel.com>
100 lines
3.7 KiB
Python
Executable File
100 lines
3.7 KiB
Python
Executable File
#!/usr/bin/env python
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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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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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from __future__ import print_function
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import time, sys, signal, atexit
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from upm import pyupm_mcp2515 as MCP2515
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def main():
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# Instantiate a MCP2515 on SPI bus 0 using a hw CS pin (-1).
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sensor = MCP2515.MCP2515(0, -1)
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## Exit handlers ##
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# This function stops python from printing a stacktrace when you
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# hit control-C
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def SIGINTHandler(signum, frame):
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raise SystemExit
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# This function lets you run code on exit, including functions from sensor
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def exitHandler():
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print("Exiting")
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sys.exit(0)
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# Register exit handlers
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atexit.register(exitHandler)
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signal.signal(signal.SIGINT, SIGINTHandler)
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# by default we just receive packets
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do_tx = False;
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if (len(sys.argv) > 1):
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do_tx = True
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# NOTE: This example assumes that only two devices are connected
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# to the CAN bus, and that both devices are running this example;
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# one in TX (transmit) mode, and one in RX (receive) mode.
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# If this is not the case, then in rx mode you may see other
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# packets from other devices, or not, depending on whether the
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# speed is correct for the network. In tx mode, errors may be
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# generated on the bus, especially if the CAN bus speed does not
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# match the rest of the network.
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# You should start the receiver example first. The transmitter
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# example will fail after about 5 seconds (timeout) of not being
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# able to transmit a message.
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# By default, after initialization, the baud rate is set to
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# 50Kbps, and the mode is NORMAL, so we don't need to set any of
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# that here.
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while (True):
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if (do_tx):
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print("Loading a packet of 8 numbers (0-7) into a TX buffer...")
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myPayload = "01234567";
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sensor.loadTXBuffer(MCP2515.MCP2515_TX_BUFFER0, 0, False,
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False, myPayload);
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# now lets try to transmit it
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print("Transmitting packet...")
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sensor.transmitBuffer(MCP2515.MCP2515_TX_BUFFER0, True)
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print("Transmit successful")
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print()
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time.sleep(.5)
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else:
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# RX mode
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# Look for a packet waiting for us in RXB0
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if (sensor.rxStatusMsgs() == MCP2515.MCP2515_RXMSG_RXB0):
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print("Packet received in RXB0, decoding...")
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# now lets retrieve and print it
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sensor.getRXMsg(MCP2515.MCP2515_RX_BUFFER0)
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sensor.printMsg();
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print()
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print("Exiting...")
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if __name__ == '__main__':
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main()
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