65 lines
2.3 KiB
Python
65 lines
2.3 KiB
Python
#!/usr/bin/env python3
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"""Sanity-check byte-level probe for EG4 LifePower4 V2 over USB-RS485.
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Sends the 'general status' frame and prints the raw reply. If you see bytes
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starting with 0x7E coming back, the protocol is confirmed and eg4_lifepower.py
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will decode them.
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Usage:
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python3 probe.py # auto-detect likely USB-serial port
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python3 probe.py /dev/tty.usbserial-XXX # explicit port
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python3 probe.py COM5 # Windows
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"""
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import sys
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import time
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import glob
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import serial # pip install pyserial
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BAUD = 9600
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CMDS = {
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"general": bytes.fromhex("7E01010000FE0D"[:-2] + "0D"), # 7E 01 01 00 FE 0D
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"hw_ver": bytes.fromhex("7E01420000FC0D"[:-2] + "0D"), # 7E 01 42 00 FC 0D
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"fw_ver": bytes.fromhex("7E01330000FE0D"[:-2] + "0D"), # 7E 01 33 00 FE 0D
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}
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# (the [:-2]+"0D" dance above is just to keep the literal aligned with the
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# canonical 6-byte frames documented upstream; simpler form below)
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CMDS = {
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"general": bytes([0x7E, 0x01, 0x01, 0x00, 0xFE, 0x0D]),
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"hw_ver": bytes([0x7E, 0x01, 0x42, 0x00, 0xFC, 0x0D]),
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"fw_ver": bytes([0x7E, 0x01, 0x33, 0x00, 0xFE, 0x0D]),
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}
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def autodetect() -> str | None:
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candidates = (
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glob.glob("/dev/tty.usbserial*") # macOS FTDI/CH340
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+ glob.glob("/dev/tty.usbmodem*") # macOS CDC-ACM
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+ glob.glob("/dev/ttyUSB*") # Linux FTDI/CH340
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+ glob.glob("/dev/ttyACM*") # Linux CDC-ACM
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)
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return candidates[0] if candidates else None
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def probe(port: str) -> None:
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print(f"opening {port} @ {BAUD} 8N1")
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with serial.Serial(port, BAUD, bytesize=8, parity="N", stopbits=1, timeout=1.5) as s:
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for name, cmd in CMDS.items():
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s.reset_input_buffer()
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s.write(cmd)
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time.sleep(0.2)
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reply = s.read(256)
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print(f"\n[{name}] sent {cmd.hex(' ')}")
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if reply:
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print(f" got ({len(reply)} bytes) {reply.hex(' ')}")
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if reply[0] == 0x7E and reply[-1] == 0x0D:
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print(" -> frame looks valid (7E ... 0D)")
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else:
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print(" got (nothing — timeout)")
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if __name__ == "__main__":
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port = sys.argv[1] if len(sys.argv) > 1 else autodetect()
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if not port:
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sys.exit("no serial port found; pass one explicitly: python3 probe.py /dev/tty.usbserial-XXXX")
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probe(port)
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