Update to aid use of ESP32 with multiple displays #687

Fix issue when using ESP32 & using multiple TFT displays & not defining TFT_CS.

Note: Future support for multiple displays in all possible hardware combinations may not be practical.

Processors/TFT_eSPI_ESP32.h

@@ -115,6 +115,7 @@
 // Define the CS (TFT chip select) pin drive code
 ////////////////////////////////////////////////////////////////////////////////////////
 #ifndef TFT_CS
+  #define TFT_CS -1  // Keep DMA code happy
   #define CS_L       // No macro allocated so it generates no code
   #define CS_H       // No macro allocated so it generates no code
 #else

TFT_eSPI.h

@@ -16,7 +16,7 @@
 #ifndef _TFT_eSPIH_
 #define _TFT_eSPIH_
 
-#define TFT_ESPI_VERSION "2.2.14"
+#define TFT_ESPI_VERSION "2.2.15"
 
 /***************************************************************************************
 **                         Section 1: Load required header files

library.json

 {
   "name": "TFT_eSPI",
-  "version": "2.2.14",
+  "version": "2.2.15",
   "keywords": "Arduino, tft, ePaper, display, STM32, ESP8266, NodeMCU, ESP32, M5Stack, ILI9341, ST7735, ILI9163, S6D02A1, ILI9486, ST7789, RM68140",
   "description": "A TFT and ePaper SPI graphics library with optimisation for ESP8266, ESP32 and STM32",
   "repository":

library.properties

 name=TFT_eSPI
-version=2.2.14
+version=2.2.15
 author=Bodmer
 maintainer=Bodmer
 sentence=TFT graphics library for Arduino processors with performance optimisation for STM32, ESP8266 and ESP32