From feda048dfac7dd7cc24b9cb46a265a1b177a753a Mon Sep 17 00:00:00 2001
From: jpirnay <jens@pirnay.com>
Date: Fri, 17 Apr 2026 16:20:40 +0200
Subject: [PATCH] Fix missing X3 serial output

---
 lib/hal/HalGPIO.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/hal/HalGPIO.cpp b/lib/hal/HalGPIO.cpp
index c1734b0e..911d5543 100644
--- a/lib/hal/HalGPIO.cpp
+++ b/lib/hal/HalGPIO.cpp
@@ -314,11 +314,15 @@ bool HalGPIO::isUsbConnected() const {
     for (uint8_t attempt = 0; attempt < 2; ++attempt) {
       int16_t currentMa = 0;
       if (X3GPIO::readBQ27220CurrentMA(&currentMa)) {
-        return currentMa > 0;
+        if (currentMa > 0) {
+          return true;
+        }
+        break;
       }
       delay(2);
     }
-    return false;
+    // Fall back to the same USB pin-level detection used by X4.
+    return digitalRead(UART0_RXD) == HIGH;
   }
   // U0RXD/GPIO20 reads HIGH when USB is connected
   return digitalRead(UART0_RXD) == HIGH;