From 671942aa60a241868ca48c98593ed836eb33b2f8 Mon Sep 17 00:00:00 2001
From: gemu2015 <gmutz2010@googlemail.com>
Date: Fri, 29 May 2020 20:54:15 +0200
Subject: [PATCH] faster ili9488 fill

---
 lib/JaretBurkett_ILI9488-gemu-1.0/ILI9488.cpp | 30 +++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/lib/JaretBurkett_ILI9488-gemu-1.0/ILI9488.cpp b/lib/JaretBurkett_ILI9488-gemu-1.0/ILI9488.cpp
index e507fdf1b..495c18ad8 100644
--- a/lib/JaretBurkett_ILI9488-gemu-1.0/ILI9488.cpp
+++ b/lib/JaretBurkett_ILI9488-gemu-1.0/ILI9488.cpp
@@ -74,6 +74,9 @@ uint8_t ili9488_start;
 // ESP8266
 #include "spi_register.h"
 #define SWSPI_OPTMODE
+// this enables the 27 bit packed mode
+#define RGB_PACK_MODE
+
 uint32_t ili9488_clock;
 uint32_t ili9488_usr;
 uint32_t ili9488_usr1;
@@ -259,6 +262,8 @@ void ILI9488::writecommand(uint8_t c) {
 #include "esp32-hal.h"
 #include "soc/spi_struct.h"
 
+#define RGB_PACK_MODE
+
 // since ardunio transferBits ia completely disfunctional
 // we use our own hardware driver for 9 bit spi
 void ILI9488::fastSPIwrite(uint8_t d,uint8_t dc) {
@@ -831,8 +836,7 @@ void ILI9488::fillScreen(uint16_t color) {
 
 //#define WRITE_SPI_REG
 
-// this enables the 27 bit packed mode
-#define RGB_PACK_MODE
+
 
 // extremely strange => if this code is merged into pack_rgb() the software crashes
 // swap bytes
@@ -1023,17 +1027,39 @@ void ILI9488::fillRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t colo
     g = (g * 255) / 63;
     b = (b * 255) / 31;
 
+#ifdef RGB_PACK_MODE
+    // init 27 bit mode
+    uint32_t data=pack_rgb(r,g,b);
+    REG_SET_BIT(SPI_USER_REG(3), SPI_USR_MOSI);
+    REG_WRITE(SPI_MOSI_DLEN_REG(3), 27 - 1);
+    uint32_t *dp=(uint32_t*)SPI_W0_REG(3);
+    digitalWrite( _cs, LOW);
+#endif
+
     for(y=h; y>0; y--) {
       for(x=w; x>0; x--) {
+  #ifndef RGB_PACK_MODE
         writedata(r);
         writedata(g);
         writedata(b);
+  #else
+        while (REG_GET_FIELD(SPI_CMD_REG(3), SPI_USR));
+        *dp=data;
+        REG_SET_BIT(SPI_CMD_REG(3), SPI_USR);
+  #endif
       }
     }
+
+#ifdef RGB_PACK_MODE
+    while (REG_GET_FIELD(SPI_CMD_REG(3), SPI_USR));
+    digitalWrite( _cs, HIGH);
+#endif
+
     ILI9488_STOP
 }
 #endif
 
+
 // Pass 8-bit (each) R,G,B, get back 16-bit packed color
 uint16_t ILI9488::color565(uint8_t r, uint8_t g, uint8_t b) {
   return ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | (b >> 3);