From 4393c3ef7fe1a5d7c3aeeb40095e26eb518fb2bc Mon Sep 17 00:00:00 2001
From: Bob-the-Kuhn <bob.kuhn@att.net>
Date: Thu, 11 Jan 2018 18:32:41 -0600
Subject: [PATCH] LCD_CONTRAST to uint16_t for 1.1.x parity (#9148)

---
 Marlin/configuration_store.cpp | 6 +++---
 Marlin/ultralcd.cpp            | 2 +-
 Marlin/ultralcd.h              | 4 ++--
 Marlin/ultralcd_impl_DOGM.h    | 2 +-
 4 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/Marlin/configuration_store.cpp b/Marlin/configuration_store.cpp
index be3796053..72f6d313f 100644
--- a/Marlin/configuration_store.cpp
+++ b/Marlin/configuration_store.cpp
@@ -189,7 +189,7 @@ typedef struct SettingsDataStruct {
   //
   // HAS_LCD_CONTRAST
   //
-  uint16_t lcd_contrast;                                // M250 C
+  int16_t lcd_contrast;                                // M250 C
 
   //
   // FWRETRACT
@@ -618,7 +618,7 @@ void MarlinSettings::postprocess() {
     _FIELD_TEST(lcd_contrast);
 
     #if !HAS_LCD_CONTRAST
-      const uint16_t lcd_contrast = 32;
+      const int16_t lcd_contrast = 32;
     #endif
     EEPROM_WRITE(lcd_contrast);
 
@@ -1159,7 +1159,7 @@ void MarlinSettings::postprocess() {
       _FIELD_TEST(lcd_contrast);
 
       #if !HAS_LCD_CONTRAST
-        uint16_t lcd_contrast;
+        int16_t lcd_contrast;
       #endif
       EEPROM_READ(lcd_contrast);
 
diff --git a/Marlin/ultralcd.cpp b/Marlin/ultralcd.cpp
index 23722e44d..da8fb9abd 100644
--- a/Marlin/ultralcd.cpp
+++ b/Marlin/ultralcd.cpp
@@ -5236,7 +5236,7 @@ void lcd_reset_alert_level() { lcd_status_message_level = 0; }
 
 #if HAS_LCD_CONTRAST
 
-  void set_lcd_contrast(const uint16_t value) {
+  void set_lcd_contrast(const int16_t value) {
     lcd_contrast = constrain(value, LCD_CONTRAST_MIN, LCD_CONTRAST_MAX);
     u8g.setContrast(lcd_contrast);
   }
diff --git a/Marlin/ultralcd.h b/Marlin/ultralcd.h
index 523db3fad..5ce7cf366 100644
--- a/Marlin/ultralcd.h
+++ b/Marlin/ultralcd.h
@@ -71,8 +71,8 @@
   #endif
 
   #if ENABLED(DOGLCD)
-    extern uint16_t lcd_contrast;
-    void set_lcd_contrast(const uint16_t value);
+    extern int16_t lcd_contrast;
+    void set_lcd_contrast(const int16_t value);
   #endif
 
   #if ENABLED(SHOW_BOOTSCREEN)
diff --git a/Marlin/ultralcd_impl_DOGM.h b/Marlin/ultralcd_impl_DOGM.h
index 201dbbdbc..1791392b8 100644
--- a/Marlin/ultralcd_impl_DOGM.h
+++ b/Marlin/ultralcd_impl_DOGM.h
@@ -222,7 +222,7 @@
 
 #include "utf_mapper.h"
 
-uint16_t lcd_contrast; // Initialized by settings.load()
+int16_t lcd_contrast; // Initialized by settings.load()
 static char currentfont = 0;
 
 // The current graphical page being rendered