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* LR11x0: try XTAL before TCXO when oscillator type is uncertain On boards with TCXO_OPTIONAL, a TCXO-first attempt either hangs RadioLib's calibration wait forever on a bare/non-TCXO module (unpatched upstream), or costs a slow failed attempt before falling back even once that's fixed with a timeout. Measured on hardware: XTAL succeeds immediately on a bare module (~350ms) and fails fast and cleanly on a genuine TCXO module (~300ms, RADIOLIB_ERR_SPI_CMD_FAILED), so trying XTAL first is a strict improvement for hang-avoidance regardless of which oscillator is actually present. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> * compacted * fix review comment * fix femtofox switches * correct the correction * 13 * 3s timeout * Treat SPI_CMD_TIMEOUT as an LR11x0 init failure The BUSY watchdog breaks RadioLib's wait, so the next bounded transfer returns SPI_CMD_TIMEOUT rather than SPI_CMD_FAILED. Only the latter was checked, so a watchdog-triggered failure fell through to getVersionInfo(), setRfSwitchTable() and startReceive() against an unresponsive chip. Also use Throttle::isWithinTimespanMs() for the watchdog's elapsed-time check instead of raw millis() arithmetic. * Drop the BUSY watchdog and probe XTAL before TCXO The watchdog bounded RadioLib's unbounded BUSY wait in LR11x0::config() by having LockingArduinoHal::digitalRead() report a stuck pin low exactly once. That let a TCXO-first attempt fail cleanly rather than hang, but it meant lying to RadioLib about a GPIO from a HAL shared by every radio driver. Ordering the attempts XTAL-first avoids the hang outright instead: attempt 1 configures no DIO3 Vref, so there is no calibration wait to get stuck in, and the TCXO fallback is only reached on a module that answered and refused XTAL. Attempts are now XTAL, then TCXO, then a settling retry on whichever oscillator was settled on - after a fallback that is a second TCXO attempt. Only TCXO_OPTIONAL builds probe XTAL; a variant that declares a Vref unconditionally still goes straight to it and never probes XTAL at all. SPI_CMD_TIMEOUT stays a failure alongside SPI_CMD_FAILED: a bounded per-command BUSY wait in Module::SPItransferStream() reports it in its own right, independently of the removed watchdog. * Drop a stray tab from the promicro TCXO readme trunk fmt: prettier flags the whitespace-only line inside the <summary> block, which was the only failing check on the PR. --------- Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com> Co-authored-by: Thomas Göttgens <tgoettgens@gmail.com>