From 1720caf27526ae4dc9ccc6dc63963ca5ec85370d Mon Sep 17 00:00:00 2001
From: Wessel Nieboer <wessel@weebl.me>
Date: Tue, 3 Mar 2026 00:01:26 +0100
Subject: [PATCH] diag build

---
 variants/rak4631/RAK4631Board.cpp | 34 ++++++++++++++++++++++++++++++-
 variants/rak4631/platformio.ini   | 17 ++++++++++++++++
 2 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/variants/rak4631/RAK4631Board.cpp b/variants/rak4631/RAK4631Board.cpp
index 21fcbce25..39550bfa4 100644
--- a/variants/rak4631/RAK4631Board.cpp
+++ b/variants/rak4631/RAK4631Board.cpp
@@ -16,6 +16,22 @@ static void __attribute__((constructor(102))) rak4631_early_poe_power() {
 }
 #endif
 
+#ifdef BOOT_DIAG
+// Diagnostic LED blink: N short blinks on green LED to indicate boot stage
+static void diag_blink(uint8_t count) {
+  pinMode(PIN_LED1, OUTPUT);
+  for (uint8_t i = 0; i < count; i++) {
+    digitalWrite(PIN_LED1, HIGH);
+    delay(100);
+    digitalWrite(PIN_LED1, LOW);
+    delay(150);
+  }
+  delay(300);
+}
+#else
+#define diag_blink(n) ((void)0)
+#endif
+
 #ifdef NRF52_POWER_MANAGEMENT
 // Static configuration for power management
 // Values set in variant.h defines
@@ -41,7 +57,16 @@ void RAK4631Board::initiateShutdown(uint8_t reason) {
 #endif // NRF52_POWER_MANAGEMENT
 
 void RAK4631Board::begin() {
+  diag_blink(1);  // Stage 1: entering begin()
+
+#ifdef DISABLE_DCDC
+  NRF52Board::begin();
+#else
   NRF52BoardDCDC::begin();
+#endif
+
+  diag_blink(2);  // Stage 2: board base init done
+
   pinMode(PIN_VBAT_READ, INPUT);
 #ifdef PIN_USER_BTN
   pinMode(PIN_USER_BTN, INPUT_PULLUP);
@@ -58,12 +83,19 @@ void RAK4631Board::begin() {
 
   Wire.begin();
 
+  diag_blink(3);  // Stage 3: I2C done, about to configure LoRa power
+
   pinMode(SX126X_POWER_EN, OUTPUT);
-#ifdef NRF52_POWER_MANAGEMENT
+#if defined(NRF52_POWER_MANAGEMENT) && !defined(DISABLE_BOOT_PROTECTION)
   // Boot voltage protection check (may not return if voltage too low)
   // We need to call this after we configure SX126X_POWER_EN as output but before we pull high
   checkBootVoltage(&power_config);
 #endif
+
+  diag_blink(4);  // Stage 4: power check passed
+
   digitalWrite(SX126X_POWER_EN, HIGH);
   delay(10);   // give sx1262 some time to power up
+
+  diag_blink(5);  // Stage 5: board.begin() complete
 }
\ No newline at end of file
diff --git a/variants/rak4631/platformio.ini b/variants/rak4631/platformio.ini
index 31b507b4c..06b79b46f 100644
--- a/variants/rak4631/platformio.ini
+++ b/variants/rak4631/platformio.ini
@@ -72,6 +72,23 @@ lib_deps =
   ${rak4631.lib_deps}
   https://github.com/RAKWireless/RAK13800-W5100S/archive/1.0.2.zip
 
+; Diagnostic build: LED blinks at boot stages + boot protection disabled
+[env:RAK_4631_repeater_diag]
+extends = env:RAK_4631_repeater
+build_flags =
+  ${env:RAK_4631_repeater.build_flags}
+  -D BOOT_DIAG
+  -D DISABLE_BOOT_PROTECTION
+
+; Diagnostic build: LED blinks + boot protection disabled + DC/DC disabled
+[env:RAK_4631_repeater_diag_no_dcdc]
+extends = env:RAK_4631_repeater
+build_flags =
+  ${env:RAK_4631_repeater.build_flags}
+  -D BOOT_DIAG
+  -D DISABLE_BOOT_PROTECTION
+  -D DISABLE_DCDC
+
 [env:RAK_4631_repeater_bridge_rs232_serial1]
 extends = rak4631
 build_flags =