CP210x chips can't hit 921600 exactly so try 400000/420000 first.
Raise FC_STALE_S from 2s to 5s so the dashboard doesn't flicker
STALE when FC telemetry arrives slowly.
Add trailing spaces to shorter status labels so they don't leave
residue when overwritten by longer ones. Replace em dashes with
regular dashes per project style.
Logger writes to stderr so it doesn't corrupt the dashboard on stdout.
Dashboard tracks its own line count and uses cursor-up instead of home
so log messages appear cleanly before/after instead of interleaved.
Add baud rate probing (921600/400000/420000), auto-detect ELRS
ports, verify module responds to CRSF ping before telemetry loop,
and increase RC send rate to 50 Hz to match Python reference.
Telemetry tool now:
- Reads raw bytes from serial port
- Parses frames incrementally via cel_crsf_stream
- Decodes link stats, battery, heartbeat, airspeed
- Sends RC frames periodically to keep link alive
- Handles Ctrl+C gracefully via signal handler
The old [0xC8][dest][src][type][size][payload][crc] format was never
used with real hardware. Remove cel_crsf_frame_legacy, *_legacy()
functions, and update tests/tools accordingly.
Switch CRC from CCITT (0x07) to DVB-S2 (0xD5) to match ELRS.
Adopt ELRS USB frame format: [addr][length][type][payload][crc].
Update frame type constants to match current ELRS protocol values.
New skeleton modules (stub implementations with TODO comments):
- crsf_telemetry.h/.c: telemetry decoders (GPS, battery, link..)
- crsf_stream.h/.c: incremental streaming frame reader
- crsf_param.h/.c: parameter protocol (read/write/set_power)
Retained old frame format as *_legacy functions for backward
compatibility with existing telemetry tool and tests.
Add cel_serial_find_elrs_port() and cel_serial_open_probe()
stubs to serial module for port auto-detection and baud probing.
Drop timeout_ms; read now returns immediately with whatever
data is available (0 if none), so callers don't block the rest
of their loop waiting on serial I/O.
telemetry's poll loop now sleeps interval_ms itself between
empty reads via a small sleep_ms helper.
Implement cel_serial_list_ports/cel_serial_free_ports with
platform backends: Windows reads HKLM\HARDWARE\DEVICEMAP\
SERIALCOMM (fast, single registry read), POSIX scans /dev for
ttyUSB*/ttyACM*.
telemetry tool gains --list, --port, and --baudrate flags;
baud rate was previously hardcoded to 400000. Rename the
tool_telemetry CMake target to telemetry.
Fix test_free_ports_zero_count, which passed a stack array to
cel_serial_free_ports (which calls free() on it), corrupting
the heap.
portersky