mirror of
https://github.com/Snigelson/pytimex.git
synced 2026-07-28 04:05:41 +00:00
Simon Larsson
36b496e9cb
Don't know why I had committed a broken version. This one runs, and also parses packet length when in text mode, to add appropriate newlines.
100 lines
2.3 KiB
Python
100 lines
2.3 KiB
Python
import serial
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import time
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import sys
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"""
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On reset the device can respond to 3 commands:
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* 'x': Device detection, echo this so the PC knows you're there
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* '?': Device ID query, reply with "M764" and a null byte ('\0')
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* 'U': Reply with 'x' and enter transmit mode
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In transmit mode, all bytes should be echoed back to the PC and the
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commands above should not be answered. Transmit mode is only left upon
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reset.
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The device is powered from the CTS control line, so this is pulled down
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at the beginning of transmission to make sure the device is reset.
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"""
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if len(sys.argv) not in [3,4]:
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print("Usage: {} <port> <log file> [bin|txt]".format(sys.argv[0]))
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sys.exit(-1)
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serialPort = sys.argv[1]
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logFileName = sys.argv[2]
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logText = False
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if len(sys.argv) == 4:
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if sys.argv[3] == "txt":
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logText = True
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# Used for rudimentary packet parsing
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pastSync = 0
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packetLeft = 0
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with serial.Serial(serialPort, 9600, timeout=0.1) as sp:
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# Used to control state of device
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transmitState = False
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def send(data):
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# print("Sending: '{}'".format(data))
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sp.write(data)
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while True:
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while True:
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# CTS control line is used for powering device, and therefore also reset it
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# Inactivated due to not available on all USB-Serial converters
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if False and sp.cts == False:
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if transmitState:
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print("Leaving transmit state")
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logfile.close()
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transmitState = False
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inb = sp.read(1)
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if len(inb) != 0:
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break
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print("Received: {}".format(inb))
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if not transmitState:
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if inb == b"x":
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print("Received detection byte ('x')")
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send(inb)
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elif inb == b"?":
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print("Received device ID query ('?')")
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send("M764\0".encode())
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elif inb == b"U":
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print("Received sync byte, entering transmit state")
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transmitState = True
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logfile = open(logFileName, 'wb')
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send(inb)
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else:
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print("Received unknown byte ({}) outside of transmit state".format(inb))
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else:
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if inb != b'U':
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pastSync = 1
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if pastSync and inb != b'\xAA':
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if packetLeft == 0:
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logfile.write("\n".encode())
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pastSync = 2
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if pastSync == 2 and packetLeft == 0:
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packetLeft = ord(inb)
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if logText:
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logfile.write(("0x{:02x} ".format(ord(inb))).encode())
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if pastSync==2:
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if packetLeft > 0:
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packetLeft -= 1
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else:
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logfile.write(inb)
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send(inb)
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