Fix issue #297

There is a bug in the ESP8266 Arduino core that averwrites the overlap
mode setup and hold bits for the hardware driven SPI SS line.  The
TFT_eSPI library has been patched as a work-around.

In overlap mode to maintain the required setup and hold times at 80MHz
ESP8266 CPU clock the SPI rate must be 27MHz or less. At 160MHz CPU
clock the SPI rate can be 40MHz.

TFT_eSPI.h

@@ -15,7 +15,7 @@
 #ifndef _TFT_eSPIH_
 #define _TFT_eSPIH_
 
-#define TFT_ESPI_VERSION "1.4.1"
+#define TFT_ESPI_VERSION "1.4.2"
 
 //#define ESP32 //Just used to test ESP32 options
 
@@ -172,6 +172,13 @@
 
 #if defined (TFT_SPI_OVERLAP)
   #undef TFT_CS
+  #define SPI1U_WRITE (SPIUMOSI | SPIUSSE | SPIUCSSETUP | SPIUCSHOLD)
+  #define SPI1U_READ  (SPIUMOSI | SPIUSSE | SPIUCSSETUP | SPIUCSHOLD | SPIUDUPLEX)
+#else
+  #ifdef ESP8266
+    #define SPI1U_WRITE (SPIUMOSI | SPIUSSE)
+    #define SPI1U_READ  (SPIUMOSI | SPIUSSE | SPIUDUPLEX)
+  #endif
 #endif
 
 #ifndef TFT_CS

library.json

 {
   "name": "TFT_eSPI",
-  "version": "1.4.1",
+  "version": "1.4.2",
   "keywords": "tft, ePaper, display, ESP8266, NodeMCU, ESP32, M5Stack, ILI9341, ST7735, ILI9163, S6D02A1, ILI9486, ST7789",
   "description": "A TFT and ePaper SPI graphics library for ESP8266 and ESP32",
   "repository":

library.properties

 name=TFT_eSPI
-version=1.4.1
+version=1.4.2
 author=Bodmer
 maintainer=Bodmer
 sentence=A fast TFT graphics library for ESP8266 and ESP32 processors for the Arduino IDE