Add DIAG instrumentation to beamformer, PA, USB, and remaining main.cpp subsystems
Completes the observe-before-fix instrumentation pass across all critical
firmware subsystems:
- ADAR1000_Manager.cpp: 99 DIAG calls covering power-up/down, TX/RX mode
switching, ADTR1107 init sequence, SPI transfers, ADC reads (with 100ms
timeout guard on unbounded busy-wait), and scratchpad verification.
- DA5578.c: 21 DIAG calls on init, reset, channel writes, clear pin
activation, and I2C error paths.
- ADS7830.c: DIAG on init (with test-read verification) and I2C
transmit/receive error logging in single-ended and differential reads.
- USBHandler.cpp: DIAG on state transitions, start flag detection,
settings data accumulation, and SET/END marker parsing.
- main.cpp remaining sections: CDC_Receive_FS callback, systemPowerUp/Down
sequences, executeChirpSequence (entry-only, timing-critical path),
runRadarPulseSequence (beam position + stepper logging), checkSystemHealth
(per-subsystem error logging with GPIO reads), attemptErrorRecovery,
Emergency_Stop, handleSystemError, PA IDQ calibration loops (DAC/ADC init,
per-channel initial readings, calibration iterations with final values),
TMP37 ADC3 init, error handler init, and GUI status send.
No behavioral changes. All logging is compile-time removable via DIAG_DISABLE.
Jason
fda8aab7a2