Guard LR1121/LR2021 radio configs with #ifdef

[valzzu]

Add conditional compilation guards for LR1121 and LR2021 radio chip configurations in rfswitch.h to prevent compilation errors when these radios are not in use. Move USE_LR2021 definition to the radio section in variant.h for consistency with other radio chip definitions.

🤝 Attestations

• I have tested that my proposed changes behave as described.
• I have tested that my proposed changes do not cause any obvious regressions on the following devices:
  • Promicro DIY

Summary by CodeRabbit

• New Features

  • Added explicit LR2021 radio module support for the DIY nRF52 Pro Micro TCXO board.
  • Configured LR2021 pin assignments, TCXO settings, interrupt mapping, and RF switch behavior.

• Bug Fixes

  • Prevented LR1121 and LR2021 hardware settings from being mixed when selecting a radio module.
  • Ensured each module uses only its applicable RF switch configuration.

[github-actions]

⚡ Try this PR in the Web Flasher

Warning

This is an automated, unreviewed CI test build. Back up your device configuration
before flashing, and only flash devices you are able to recover.

Supported boards built by this PR (27)

	Device	Board	Platform
	Crowpanel Adv 3.5 TFT	elecrow-adv-35-tft	esp32-s3
	Heltec HT62	heltec-ht62-esp32c3-sx1262	esp32-c3
	Heltec Mesh Node 096	heltec-mesh-node-t096	nrf52840
	Heltec Mesh Node T1	heltec-mesh-node-t1	nrf52840
	Heltec Mesh Node T114	heltec-mesh-node-t114	nrf52840
	Heltec V3	heltec-v3	esp32-s3
	Heltec V4	heltec-v4	esp32-s3
	Meshnology W10	meshnology_w10	esp32-s3
	Raspberry Pi Pico	pico	rp2040
	Raspberry Pi Pico W	picow	rp2040
	RAK WisMesh Tag	rak_wismeshtag	nrf52840
	RAK WisBlock 11200	rak11200	esp32
	RAK WisBlock 11310	rak11310	rp2040
	RAK3312	rak3312	esp32-s3
	RAK WisBlock 4631	rak4631	nrf52840
	Seeed SenseCAP Mesh-Tracker-X1	seeed_mesh_tracker_X1	nrf52840
	Seeed Wio Tracker L1	seeed_wio_tracker_L1	nrf52840
	Seeed Xiao NRF52840 Kit	seeed_xiao_nrf52840_kit	nrf52840
	Seeed Xiao ESP32-S3	seeed-xiao-s3	esp32-s3
	Station G2	station-g2	esp32-s3
	Station G3	station-g3	esp32-s3
	LILYGO T-Deck	t-deck-tft	esp32-s3
	LILYGO T-Echo	t-echo	nrf52840
	LILYGO T-Echo Plus	t-echo-plus	nrf52840
	LILYGO T-Impulse Plus	t-impulse-plus	nrf52840
	LilyGo T3-C6	tlora-c6	esp32-c6
	Seeed SenseCAP T1000-E	tracker-t1000-e	nrf52840

Build artifacts expire on 2026-08-11. Updated for e7e482a.

[coderabbitai]

📝 Walkthrough

Walkthrough

The board variant now enables LR2021 explicitly and conditionally compiles LR2021 configuration macros and LR1121/LR2021 RF switch mappings.

Changes

LR2021 configuration

Layer / File(s)	Summary
Enable LR2021 configuration variants/nrf52840/diy/nrf52_promicro_diy_tcxo/variant.h	Defines USE_LR2021 and guards the LR2021 pin and configuration macros with that selection flag.
Guard RF switch mappings variants/nrf52840/diy/nrf52_promicro_diy_tcxo/rfswitch.h	Guards the LR1121 and LR2021 RF switch tables independently and includes the LR2021 DIO8 front-end power signal in its documentation.

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title is concise and accurately summarizes the main change to radio config guards.
Description check	✅ Passed	The description includes a clear summary and completed attestations, with at least one device test noted.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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