diff options
Diffstat (limited to 'stacks/tncs/tnc2c-tx-rx-test.py')
| -rw-r--r-- | stacks/tncs/tnc2c-tx-rx-test.py | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/stacks/tncs/tnc2c-tx-rx-test.py b/stacks/tncs/tnc2c-tx-rx-test.py new file mode 100644 index 0000000..76e639d --- /dev/null +++ b/stacks/tncs/tnc2c-tx-rx-test.py @@ -0,0 +1,184 @@ +#!/usr/bin/env python3 +"""TX then RX diagnostic for TNC2C + CB - no HyBBX.""" + +from __future__ import annotations + +import fcntl +import os +import struct +import sys +import time +import termios + +DEV = "/dev/ttyS4" +BAUD = termios.B19200 + +FIRMWARE = (b"TheFirmware", b"NORD", b"Version 2.7", b"Checksum") + + +def open_port() -> int: + fd = os.open(DEV, os.O_RDWR | os.O_NOCTTY | os.O_NONBLOCK) + t = termios.tcgetattr(fd) + t[0] = t[1] = 0 + t[2] = termios.CLOCAL | termios.CREAD | termios.CS8 + t[3] = t[4] = t[5] = BAUD + t[6][termios.VMIN] = 0 + t[6][termios.VTIME] = 5 + termios.tcsetattr(fd, termios.TCSANOW, t) + termios.tcflush(fd, termios.TCIOFLUSH) + flags = struct.unpack("I", fcntl.ioctl(fd, 0x5415, struct.pack("I", 0)))[0] + flags |= 0x006 + fcntl.ioctl(fd, 0x5416, struct.pack("I", flags)) + return fd + + +def modem(fd: int) -> str: + f = struct.unpack("I", fcntl.ioctl(fd, 0x5415, struct.pack("I", 0)))[0] + return f"RTS={int(bool(f&4))} CTS={int(bool(f&8))} DSR={int(bool(f&0x100))} DCD={int(bool(f&0x80))}" + + +def read_sec(fd: int, sec: float) -> bytes: + end = time.time() + sec + chunks: list[bytes] = [] + while time.time() < end: + try: + b = os.read(fd, 4096) + if b: + chunks.append(b) + except BlockingIOError: + time.sleep(0.02) + return b"".join(chunks) + + +def write(fd: int, data: bytes) -> None: + os.write(fd, data) + termios.tcdrain(fd) + + +def has_fw(data: bytes) -> bool: + lo = data.lower() + return any(m.lower() in lo for m in FIRMWARE) + + +def kiss_escape(data: bytes) -> bytes: + out = bytearray() + for b in data: + if b == 0xC0: + out.extend((0xDB, 0xDC)) + elif b == 0xDB: + out.extend((0xDB, 0xDD)) + else: + out.append(b) + return bytes(out) + + +def ax25_addr(call: str, last: bool) -> bytes: + call = call.upper().ljust(6)[:6] + raw = bytes((ord(c) << 1) for c in call) + return raw + bytes([((0 & 0x0F) << 1) | (0x01 if last else 0x00)]) + + +def ax25_crc(data: bytes) -> int: + crc = 0xFFFF + for b in data: + crc ^= b + for _ in range(8): + crc = (crc >> 1) ^ 0x8408 if crc & 1 else crc >> 1 + return crc ^ 0xFFFF + + +def ax25_ui(src: str, dst: str, info: bytes) -> bytes: + body = ax25_addr(dst, False) + ax25_addr(src, True) + b"\x03\xF0" + info + crc = ax25_crc(body) + return body + bytes((crc & 0xFF, crc >> 8)) + + +def kiss_frame(payload: bytes) -> bytes: + return b"\xC0\x00" + kiss_escape(payload) + b"\xC0" + + +def main() -> int: + print("=" * 60) + print("TNC2C TX/RX Test") + print("=" * 60) + + if os.system("pgrep -x hybbx >/dev/null 2>&1") == 0: + print("FAIL: hybbx is running - stop it first") + return 2 + + fd = open_port() + print(f"Device: {DEV} 19200 8N1 {modem(fd)}") + + # --- Host check --- + print("\n[1] Host check") + passive = read_sec(fd, 2.0) + write(fd, b"kiss off\r") + time.sleep(0.5) + pre = read_sec(fd, 1.0) + write(fd, b"INFO\r") + time.sleep(0.3) + info = read_sec(fd, 4.0) + all_host = passive + pre + info + if has_fw(all_host): + print(" OK: firmware/host detected") + elif info.strip() in (b"INFO", b"INFO\r", b"INFO\r\n"): + print(" WARN: echo only - try ./tnc2c-host-reset.sh --kiss or ./tnc2c-boot-wait.sh --recover-only") + else: + print(f" INFO reply: {info[:120]!r}") + + # --- TX --- + print("\n[2] TX (KISS UI TEST-0 -> CQ, Msg=TXRX)") + write(fd, b"kiss on\r") + time.sleep(0.5) + read_sec(fd, 0.3) + pkt = kiss_frame(ax25_ui("TEST-0", "CQ", b"TXRX")) + t0 = time.time() + write(fd, pkt) + time.sleep(3.0) + tx_rx = read_sec(fd, 1.0) + write(fd, b"kiss off\r") + time.sleep(0.3) + + kiss_back = b"\xc0" in tx_rx or b"TXRX" in tx_rx + print(f" Sent: {len(pkt)} bytes KISS") + print(f" Serial RX: {len(tx_rx)} bytes") + if kiss_back: + print(" OK: KISS frame seen on serial") + else: + print(" WARN: no KISS echo on serial") + print(" -> CHECK NOW: LED2 PTT + modem tone on 2m CB radio") + + # --- RX (passive, no TX) --- + print("\n[3] RX (passive 12s, kiss off - listening on radio/monitor)") + termios.tcflush(fd, termios.TCIOFLUSH) + write(fd, b"kiss off\r") + time.sleep(0.5) + read_sec(fd, 0.5) + print(" Listening 12s ... (RF noise/CD should keep LED3 on)") + rx_data = read_sec(fd, 12.0) + os.close(fd) + + print(f" Passive RX: {len(rx_data)} bytes") + if rx_data: + printable = sum(1 for b in rx_data if 32 <= b < 127 or b in (9, 10, 13)) + ratio = printable / len(rx_data) + print(f" Printable ratio: {ratio:.0%}") + if b"\xc0" in rx_data: + print(" OK: KISS frame(s) received (RF traffic or monitor)") + else: + print(f" Sample: {rx_data[:80]!r}") + else: + print(" (no serial traffic - normal on empty band)") + print(" -> Hardware RX: LED3 CD with noise/SQ open?") + + print("\n" + "=" * 60) + print("Hardware checklist:") + print(" TX: LED2 (PTT) blinked? 2m CB heard modem tone?") + print(" RX: LED3 (CD) on with noise? SQ closed -> CD off?") + print(" DIN: Pin1=TX(white) Pin2=GND Pin3=PTT(red) Pin4=RX(tip)") + print("=" * 60) + return 0 + + +if __name__ == "__main__": + sys.exit(main()) |