Add option DOGM_SPI_DELAY_US

Marlin/Configuration_adv.h

@@ -460,15 +460,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/Cartesio/Configuration_adv.h

@@ -460,15 +460,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/Felix/Configuration_adv.h

@@ -460,15 +460,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/Hephestos/Configuration_adv.h

@@ -460,15 +460,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/Hephestos_2/Configuration_adv.h

@@ -460,15 +460,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   #define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/K8200/Configuration_adv.h

@@ -473,15 +473,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/K8400/Configuration_adv.h

@@ -460,15 +460,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/RigidBot/Configuration_adv.h

@@ -460,15 +460,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/SCARA/Configuration_adv.h

@@ -460,15 +460,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/TAZ4/Configuration_adv.h

@@ -468,15 +468,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/WITBOX/Configuration_adv.h

@@ -460,15 +460,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/delta/biv2.5/Configuration_adv.h

@@ -462,15 +462,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/delta/generic/Configuration_adv.h

@@ -462,15 +462,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h

@@ -462,15 +462,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h

@@ -467,15 +467,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h

@@ -462,15 +462,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/makibox/Configuration_adv.h

@@ -460,15 +460,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h

@@ -460,15 +460,19 @@
 
 #endif // SDSUPPORT
 
-// for dogm lcd displays you can choose some additional fonts:
+// Some additional options are available for graphical displays:
 #if ENABLED(DOGLCD)
-  // save 3120 bytes of PROGMEM by commenting out #define USE_BIG_EDIT_FONT
+  // A bigger font is available for edit items. Costs 3120 bytes of PROGMEM.
-  // we don't have a big font for Cyrillic, Kana
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_BIG_EDIT_FONT
 
-  // If you have spare 2300Byte of progmem and want to use a
+  // A smaller font may be used on the Info Screen. Costs 2300 bytes of PROGMEM.
-  // smaller font on the Info-screen uncomment the next line.
+  // Western only. Not available for Cyrillic, Kana, Turkish, Greek, or Chinese.
   //#define USE_SMALL_INFOFONT
+
+  // Enable this option and reduce the value to optimize screen updates.
+  // The normal delay is 10µs. Use the lowest value that still gives a reliable display.
+  //#define DOGM_SPI_DELAY_US 5
 #endif // DOGLCD
 
 // @section safety

Marlin/ultralcd_st7920_u8glib_rrd.h

@@ -106,12 +106,18 @@ static void ST7920_SWSPI_SND_8BIT(uint8_t val) {
   ST7920_SND_BIT; // 8
 }
 
-#define ST7920_CS()              {WRITE(ST7920_CS_PIN,1);u8g_10MicroDelay();}
+#if defined(DOGM_SPI_DELAY_US) && DOGM_SPI_DELAY_US > 0
-#define ST7920_NCS()             {WRITE(ST7920_CS_PIN,0);}
+  #define U8G_DELAY() delayMicroseconds(DOGM_SPI_DELAY_US)
-#define ST7920_SET_CMD()         {ST7920_SWSPI_SND_8BIT(0xf8);u8g_10MicroDelay();}
+#else
-#define ST7920_SET_DAT()         {ST7920_SWSPI_SND_8BIT(0xfa);u8g_10MicroDelay();}
+  #define U8G_DELAY() u8g_10MicroDelay()
-#define ST7920_WRITE_BYTE(a)     {ST7920_SWSPI_SND_8BIT((uint8_t)((a)&0xf0u));ST7920_SWSPI_SND_8BIT((uint8_t)((a)<<4u));u8g_10MicroDelay();}
+#endif
-#define ST7920_WRITE_BYTES(p,l)  {uint8_t i;for(i=0;i<l;i++){ST7920_SWSPI_SND_8BIT(*p&0xf0);ST7920_SWSPI_SND_8BIT(*p<<4);p++;}u8g_10MicroDelay();}
+
+#define ST7920_CS()              { WRITE(ST7920_CS_PIN,1); U8G_DELAY(); }
+#define ST7920_NCS()             { WRITE(ST7920_CS_PIN,0); }
+#define ST7920_SET_CMD()         { ST7920_SWSPI_SND_8BIT(0xf8); U8G_DELAY(); }
+#define ST7920_SET_DAT()         { ST7920_SWSPI_SND_8BIT(0xfa); U8G_DELAY(); }
+#define ST7920_WRITE_BYTE(a)     { ST7920_SWSPI_SND_8BIT((uint8_t)((a)&0xf0u)); ST7920_SWSPI_SND_8BIT((uint8_t)((a)<<4u)); U8G_DELAY(); }
+#define ST7920_WRITE_BYTES(p,l)  { for (uint8_t i = l + 1; --i;) { ST7920_SWSPI_SND_8BIT(*p&0xf0); ST7920_SWSPI_SND_8BIT(*p<<4); p++; } U8G_DELAY(); }
 
 uint8_t u8g_dev_rrd_st7920_128x64_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, void *arg) {
   uint8_t i, y;
@@ -167,13 +173,13 @@ uint8_t u8g_dev_rrd_st7920_128x64_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, vo
     }
     break;
   }
-#if PAGE_HEIGHT == 8
+  #if PAGE_HEIGHT == 8
-  return u8g_dev_pb8h1_base_fn(u8g, dev, msg, arg);
+    return u8g_dev_pb8h1_base_fn(u8g, dev, msg, arg);
-#elif PAGE_HEIGHT == 16
+  #elif PAGE_HEIGHT == 16
-  return u8g_dev_pb16h1_base_fn(u8g, dev, msg, arg);
+    return u8g_dev_pb16h1_base_fn(u8g, dev, msg, arg);
-#else
+  #else
-  return u8g_dev_pb32h1_base_fn(u8g, dev, msg, arg);
+    return u8g_dev_pb32h1_base_fn(u8g, dev, msg, arg);
-#endif
+  #endif
 }
 
 uint8_t   u8g_dev_st7920_128x64_rrd_buf[(LCD_PIXEL_WIDTH) * (PAGE_HEIGHT) / 8] U8G_NOCOMMON;