From 6427765f23575adff1226b60aaeea64d286a65c7 Mon Sep 17 00:00:00 2001
From: pennam <m.pennasilico@arduino.cc>
Date: Tue, 2 Dec 2025 11:37:29 +0100
Subject: [PATCH] TRNG: keep track of initialization status

---
 cores/arduino/WMath.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/cores/arduino/WMath.cpp b/cores/arduino/WMath.cpp
index 83184d139..02e544f0f 100644
--- a/cores/arduino/WMath.cpp
+++ b/cores/arduino/WMath.cpp
@@ -48,8 +48,14 @@ extern "C" {
 static long trng()
 {
   uint32_t value[4];
-  if (HW_SCE_McuSpecificInit() != FSP_SUCCESS)
-    return -1;
+  static bool SCE_inited = false;
+  if (!SCE_inited) {
+    if (HW_SCE_McuSpecificInit() != FSP_SUCCESS) {
+      return -1;
+    }
+    SCE_inited = true;
+  }
+
   HW_SCE_RNG_Read(value);
   return (long)value[0] >= 0 ? value[0] : -value[0];
 }