86 lines
2.4 KiB
Python
86 lines
2.4 KiB
Python
#!/usr/bin/env python3
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import argparse
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import glob
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import sys
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import time
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try:
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import serial
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except ImportError:
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print("need pyserial: sudo apt install python3-serial (or pip3 install pyserial)")
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sys.exit(1)
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def list_ports():
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ports = sorted(glob.glob("/dev/ttyUSB*") + glob.glob("/dev/ttyACM*") + glob.glob("/dev/ttyS*"))
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for p in ports:
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print(p)
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if not ports:
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print("no serial ports found")
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return ports
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def open_port(name, baud):
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sp = serial.Serial(None, baud, bytesize=8, parity="N", stopbits=1, timeout=0.3)
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sp.port = name
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sp.open()
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return sp
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def drain(sp, seconds):
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deadline = time.time() + seconds
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buf = b""
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while time.time() < deadline:
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chunk = sp.read(256)
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if chunk:
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buf += chunk
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return buf
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def show(buf):
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if not buf:
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return "(no bytes)"
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text = buf.decode("ascii", "replace").replace("\n", "\\n").replace("\r", "\\r")
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hexs = " ".join(f"{b:02X}" for b in buf)
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return f"ascii[{text}] hex[{hexs}]"
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def main():
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ap = argparse.ArgumentParser(description="RS485 bus test tool for LPC verification")
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ap.add_argument("-l", "--list", action="store_true", help="list serial ports")
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ap.add_argument("-p", "--port", default="/dev/ttyUSB0")
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ap.add_argument("-b", "--baud", type=int, default=9600)
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ap.add_argument("-s", "--send", help='text to send, \\n \\r escaped')
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ap.add_argument("-w", "--listen", type=float, default=0, help="seconds to listen after send")
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ap.add_argument("-i", "--interactive", action="store_true", help="read line from stdin, send, show reply")
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args = ap.parse_args()
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if args.list:
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list_ports()
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return
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sp = open_port(args.port, args.baud)
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print(f"opened {args.port} @ {args.baud} 8N1, Ctrl+C to exit")
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try:
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if args.send:
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payload = args.send.replace("\\n", "\n").replace("\\r", "\r").encode("ascii")
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sp.write(payload)
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sp.flush()
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print(f"TX: {payload!r}")
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if args.interactive:
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while True:
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line = input("TX> ")
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if not line:
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continue
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sp.write((line + "\n").encode("ascii"))
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sp.flush()
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print("RX:", show(drain(sp, 0.3)))
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if args.listen > 0:
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print("RX:", show(drain(sp, args.listen)))
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finally:
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sp.close()
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if __name__ == "__main__":
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main()
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