From 5510d3aeb5e83dd3071c8a3b9651c52306fc89f2 Mon Sep 17 00:00:00 2001
From: Jonny <jonny@jonnybarker.com>
Date: Fri, 12 Sep 2025 20:07:25 +0100
Subject: [PATCH] Wait at most 100ms for Serial in init_serial on 2CAN so it
 will boot without USB

---
 Software/Software.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Software/Software.cpp b/Software/Software.cpp
index 95f25ed8..19cb5382 100644
--- a/Software/Software.cpp
+++ b/Software/Software.cpp
@@ -67,7 +67,18 @@ void register_transmitter(Transmitter* transmitter) {
 void init_serial() {
   // Init Serial monitor
   Serial.begin(115200);
+#if HW_LILYGO2CAN
+  // Wait up to 100ms for Serial to be available. On the ESP32S3 Serial is
+  // provided by the USB controller, so will only work if the board is connected
+  // to a computer.
+  for (int i = 0; i < 10; i++) {
+    if (Serial)
+      break;
+    delay(10);
+  }
+#else
   while (!Serial) {}
+#endif
 }
 
 void connectivity_loop(void*) {