From 1242e875aadcb5b5ef8a9f54fd99f32a0adbdde8 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <thinkyhead@users.noreply.github.com>
Date: Tue, 15 Apr 2025 15:49:23 -0500
Subject: [PATCH] =?UTF-8?q?=F0=9F=9A=B8=20More=20frequent=20button=20polli?=
 =?UTF-8?q?ng=20(#27797)?=
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---
 Marlin/Configuration_adv.h           |  2 ++
 Marlin/src/inc/Conditionals-5-post.h |  4 ++++
 Marlin/src/module/temperature.cpp    | 11 ++++++++---
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index d4b4307b05..73073762f1 100644
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -2268,6 +2268,8 @@
   #define ADC_BUTTON_DEBOUNCE_DELAY 16  // (count) Increase if buttons bounce or repeat too fast
 #endif
 
+//#define FAST_BUTTON_POLLING           // Poll buttons at ~1kHz on 8-bit AVR. Set to 'false' for slow polling on 32-bit.
+
 // @section safety
 
 /**
diff --git a/Marlin/src/inc/Conditionals-5-post.h b/Marlin/src/inc/Conditionals-5-post.h
index 9b16f515d6..380e8e6071 100644
--- a/Marlin/src/inc/Conditionals-5-post.h
+++ b/Marlin/src/inc/Conditionals-5-post.h
@@ -3557,6 +3557,10 @@
   #define HAS_ROTARY_ENCODER 1
 #endif
 
+#if defined(CPU_32_BIT) && !defined(FAST_BUTTON_POLLING)
+  #define FAST_BUTTON_POLLING
+#endif
+
 #if PIN_EXISTS(SAFE_POWER) && DISABLED(DISABLE_DRIVER_SAFE_POWER_PROTECT)
   #define HAS_DRIVER_SAFE_POWER_PROTECT 1
 #endif
diff --git a/Marlin/src/module/temperature.cpp b/Marlin/src/module/temperature.cpp
index 169d86a72f..5c9f122067 100644
--- a/Marlin/src/module/temperature.cpp
+++ b/Marlin/src/module/temperature.cpp
@@ -4283,10 +4283,15 @@ void Temperature::isr() {
   #endif // SLOW_PWM_HEATERS
 
   //
-  // Update lcd buttons 488 times per second
+  // Update lcd buttons at ~488Hz or ~976Hz
   //
-  static bool do_buttons;
-  if ((do_buttons ^= true)) ui.update_buttons();
+  #if ENABLED(FAST_BUTTON_POLLING)
+    constexpr bool do_buttons = true;
+  #else
+    static bool do_buttons;
+    do_buttons ^= true;
+  #endif
+  if (do_buttons) ui.update_buttons();
 
   /**
    * One sensor is sampled on every other call of the ISR.