From b0b2f22e5b26b4964191eb52c63168f57b7830c6 Mon Sep 17 00:00:00 2001
From: gemu <gmutz2010@googlemail.com>
Date: Mon, 15 Jan 2024 21:58:46 +0100
Subject: [PATCH] fix display dimmer (#20491)

---
 lib/lib_display/Xlatb_RA8876-gemu-1.0/RA8876.cpp | 4 ++++
 lib/lib_display/Xlatb_RA8876-gemu-1.0/RA8876.h   | 9 ++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/lib/lib_display/Xlatb_RA8876-gemu-1.0/RA8876.cpp b/lib/lib_display/Xlatb_RA8876-gemu-1.0/RA8876.cpp
index dbeb77601..ce1aa4603 100644
--- a/lib/lib_display/Xlatb_RA8876-gemu-1.0/RA8876.cpp
+++ b/lib/lib_display/Xlatb_RA8876-gemu-1.0/RA8876.cpp
@@ -193,6 +193,10 @@ void RA8876::DisplayOnff(int8_t on) {
   }
 }
 
+void RA8876::dim10(uint8_t contrast, uint16_t contrast_gamma) {
+  dim(contrast / 16); 
+}
+
 // 0-15
 void RA8876::dim(uint8_t contrast) {
   SPI.beginTransaction(m_spiSettings);
diff --git a/lib/lib_display/Xlatb_RA8876-gemu-1.0/RA8876.h b/lib/lib_display/Xlatb_RA8876-gemu-1.0/RA8876.h
index 7cf2f031b..4bf711da7 100644
--- a/lib/lib_display/Xlatb_RA8876-gemu-1.0/RA8876.h
+++ b/lib/lib_display/Xlatb_RA8876-gemu-1.0/RA8876.h
@@ -26,6 +26,8 @@
 #include "driver/spi_master.h"
 #endif
 
+#include "tasmota_options.h"
+
 #undef SPRINT
 #define SPRINT(A) {char str[32];sprintf(str,"val: %d ",A);Serial.println((char*)str);}
 
@@ -147,10 +149,14 @@ enum ExternalFontFamily
 typedef uint8_t FontFlags;
 #define RA8876_FONT_FLAG_XLAT_FULLWIDTH 0x01  // Translate ASCII to Unicode fullwidth forms
 
+
+#ifndef RA8876_SPI_SPEED
 // 1MHz. TODO: Figure out actual speed to use
 // Data sheet section 5.2 says maximum SPI clock is 50MHz.
 //#define RA8876_SPI_SPEED 10000000
-#define RA8876_SPI_SPEED 25000000
+//#define RA8876_SPI_SPEED 25000000
+#define RA8876_SPI_SPEED 40000000
+#endif
 
 // With SPI, the RA8876 expects an initial byte where the top two bits are meaningful. Bit 7
 // is A0, bit 6 is WR#. See data sheet section 7.3.2 and section 19.
@@ -501,6 +507,7 @@ class RA8876 : public Renderer {
   void setDrawMode(uint8_t mode);
   void setDrawMode_reg(uint8_t mode);
   void dim(uint8_t contrast);
+  void dim10(uint8_t contrast, uint16_t contrast_gamma);
   void FastString(uint16_t x,uint16_t y,uint16_t tcolor, const char* str);
 
  private: