From 43a1976f6d5df70d0e51c63c7c151656e67c34fc Mon Sep 17 00:00:00 2001
From: MagnusKos <magnuskos@gmail.com>
Date: Mon, 21 Jul 2025 18:14:50 +0300
Subject: [PATCH] Pro-Micro DeepSleep Quick Fix It is noticed that some
 nRF52840 boards (pro-micro in particular) stopped waking up from the deep
 sleep state (shutdown state) with a press of a button. The problem is in a
 Serial1.end() call.

---
 src/platform/nrf52/main-nrf52.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/platform/nrf52/main-nrf52.cpp b/src/platform/nrf52/main-nrf52.cpp
index 1bf9a39fd..958f1abcc 100644
--- a/src/platform/nrf52/main-nrf52.cpp
+++ b/src/platform/nrf52/main-nrf52.cpp
@@ -284,8 +284,12 @@ void cpuDeepSleep(uint32_t msecToWake)
 #endif
     // This may cause crashes as debug messages continue to flow.
     Serial.end();
+
+    // This causes troubles with waking up on nrf52 (on pro-micro in particular):
+    // we have no Serial1 in use on nrf52, check Serial and GPS modules.
 #ifdef PIN_SERIAL1_RX
-    Serial1.end();
+    if (Serial1)        // A straightforward solution to the wake from deepsleep problem
+        Serial1.end();
 #endif
     setBluetoothEnable(false);