From f4bc37093d520b149cabbe5e242715838e7feebf Mon Sep 17 00:00:00 2001
From: ladyada <ladyada@rogflow>
Date: Tue, 15 Sep 2026 10:47:52 -0400
Subject: [PATCH] Release SD logger setup stack before logging

Prevent setup from being inlined into main so SD initialization temporaries are released before loop runs. Uno disassembly confirms main no longer retains a 129-byte local frame and two saved registers.

Co-authored-by: Limor Fried <ladyada@users.noreply.github.com>
---
 examples/shield_sdlog/shield_sdlog.ino | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/examples/shield_sdlog/shield_sdlog.ino b/examples/shield_sdlog/shield_sdlog.ino
index 8ca473d..55b7b6f 100644
--- a/examples/shield_sdlog/shield_sdlog.ino
+++ b/examples/shield_sdlog/shield_sdlog.ino
@@ -74,6 +74,8 @@ void error(uint8_t errno) {
   }
 }
 
+// Keep SD initialization buffers off the stack once logging starts.
+void setup() __attribute__((noinline));
 void setup() {
   // for Leonardos, if you want to debug SD issues, uncomment this line
   // to see serial output