Correct #400 and #402 + other tweaks

Corrected font 2 rendering issue #402
Corrected NULL pointer issue #400
Changed grave ` character (key for this character is left of numeral 1
key) to degree symbol in font 2
Change setup24 so DC pin is not D3

Extensions/Sprite.cpp

@@ -1679,7 +1679,7 @@ int16_t TFT_eSprite::drawChar(uint16_t uniCode, int32_t x, int32_t y, uint8_t fo
     if ((font>2) && (font<9))
     {
       // This is slower than above but is more convenient for the RLE fonts
-      flash_address = pgm_read_dword( (const void*)pgm_read_dword( &(fontdata[font].chartbl ) ) + uniCode*sizeof(void *) );
+      flash_address = pgm_read_dword( (const void*) (pgm_read_dword( &(fontdata[font].chartbl ) ) + uniCode*sizeof(void *)) );
       width = pgm_read_byte( (uint8_t *)pgm_read_dword( &(fontdata[font].widthtbl ) ) + uniCode );
       height= pgm_read_byte( &fontdata[font].height );
     }

Fonts/Font16.c

@@ -15,7 +15,8 @@ PROGMEM const unsigned char widtbl_f16[96] =         // character width table
         8, 4, 8, 8, 7, 10, 8, 8,            // char 72 - 79
         8, 8, 8, 8, 8, 8, 8, 10,            // char 80 - 87
         8, 8, 8, 4, 7, 4, 7, 9,             // char 88 - 95
-        4, 7, 7, 7, 7, 7, 6, 7,             // char 96 - 103
+//      4, 7, 7, 7, 7, 7, 6, 7,             // char 96 - 103 grave     see lines 411-414
+        5, 7, 7, 7, 7, 7, 6, 7,             // char 96 - 103 celcius
         7, 4, 5, 6, 4, 8, 7, 8,             // char 104 - 111
         7, 8, 6, 6, 5, 7, 8, 8,             // char 112 - 119
         6, 7, 7, 5, 3, 5, 8, 6              // char 120 - 127
@@ -407,8 +408,10 @@ PROGMEM const unsigned char chr_f16_5F[32] =         // 1 unsigned chars per row
 
 PROGMEM const unsigned char chr_f16_60[16] =         // 1 unsigned char per row
 {
-        0x00, 0x00, 0x00, 0x40, 0x40, 0x40, 0x20, 0x00, 0x00, 0x00, 0x00,    // row 1 - 11
-        0x00, 0x00, 0x00, 0x00, 0x00                                         // row 12 - 16
+//      0x00, 0x00, 0x00, 0x40, 0x40, 0x40, 0x20, 0x00, 0x00, 0x00, 0x00,    // row 1 - 11   grave
+//      0x00, 0x00, 0x00, 0x00, 0x00                                         // row 12 - 16
+        0x00, 0x00, 0x00, 0x60, 0x90, 0x90, 0x60, 0x00, 0x00, 0x00, 0x00,    // row 1 - 11   Celcius
+        0x00, 0x00, 0x00, 0x00, 0x00    
 };
 
 PROGMEM const unsigned char chr_f16_61[16] =         // 1 unsigned char per row

TFT_eSPI.cpp

@@ -2352,7 +2352,7 @@ int16_t TFT_eSPI::textWidth(const char *string, uint8_t font)
       str_width += pgm_read_byte( widthtable + uniCode); // Normally we need to subtract 32 from uniCode
       else str_width += pgm_read_byte( widthtable + 32); // Set illegal character = space width
     }
-    if ((font == 2) && (str_width > 0)) str_width--;
+
   }
   else
   {
@@ -4342,23 +4342,24 @@ int16_t TFT_eSPI::drawChar(uint16_t uniCode, int32_t x, int32_t y, uint8_t font)
     {
       spi_begin();
 
-      setWindow(x, y, (x + w * 8) - 1, y + height - 1);
+      setWindow(x, y, x + width - 1, y + height - 1);
 
       uint8_t mask;
       for (int32_t i = 0; i < height; i++)
       {
+        pX = width;
         for (int32_t k = 0; k < w; k++)
         {
-          line = pgm_read_byte((uint8_t *)flash_address + w * i + k);
-          pX = x + k * 8;
+          line = pgm_read_byte((uint8_t *) (flash_address + w * i + k) );
           mask = 0x80;
-          while (mask) {
+          while (mask && pX) {
             if (line & mask) {tft_Write_16(textcolor);}
             else {tft_Write_16(textbgcolor);}
+            pX--;
             mask = mask >> 1;
           }
         }
-        pY += textsize;
+        if (pX) {tft_Write_16(textbgcolor);}
       }
 
       spi_end();
@@ -4895,6 +4896,12 @@ int16_t TFT_eSPI::drawFloat(float floatNumber, uint8_t dp, int32_t poX, int32_t
 
 void TFT_eSPI::setFreeFont(const GFXfont *f)
 {
+  if (f == nullptr) // Fix issue #400 (ESP32 crash)
+  {
+    setTextFont(1); // Use GLCD font
+    return;
+  }
+
   textfont = 1;
   gfxFont = (GFXfont *)f;
 

User_Setups/Setup12_M5Stack.h

@@ -27,3 +27,6 @@
 
 
 #define SPI_FREQUENCY  27000000
+
+// Optional reduced SPI frequency for reading TFT
+#define SPI_READ_FREQUENCY  5000000

User_Setups/Setup24_ST7789.h

@@ -27,8 +27,9 @@
 
 // For NodeMCU - use pin numbers in the form PIN_Dx where Dx is the NodeMCU pin designation
 #define TFT_CS   -1      // Define as not used
-#define TFT_DC   PIN_D3  // Data Command control pin
-#define TFT_RST  PIN_D4  // Reset pin (could connect to NodeMCU RST, see next line)
+#define TFT_DC   PIN_D1  // Data Command control pin
+#define TFT_RST  PIN_D4  // TFT reset pin (could connect to NodeMCU RST, see next line)
+//#define TFT_RST  -1    // TFT reset pin connect to NodeMCU RST, must also then add 10K pull down to TFT SCK
 
 
 #define LOAD_GLCD   // Font 1. Original Adafruit 8 pixel font needs ~1820 bytes in FLASH

library.json

@@ -1,6 +1,6 @@
 {
   "name": "TFT_eSPI",
-  "version": "1.4.13",
+  "version": "1.4.14",
   "keywords": "tft, ePaper, display, ESP8266, NodeMCU, ESP32, M5Stack, ILI9341, ST7735, ILI9163, S6D02A1, ILI9486, ST7789, RM68140",
   "description": "A TFT and ePaper SPI graphics library for ESP8266 and ESP32",
   "repository":

library.properties

@@ -1,5 +1,5 @@
 name=TFT_eSPI
-version=1.4.13
+version=1.4.14
 author=Bodmer
 maintainer=Bodmer
 sentence=A fast TFT graphics library for ESP8266 and ESP32 processors for the Arduino IDE