feat(LED Matrix Display): Added support for a LED Matrix display

This commit adds support for a specific LED Matrix display, which can be
used to show the number of found devices on a rather large display.
We (hackerspace Brixel) used this on the mini Maker Faire Gent 2019 to
show the number of found devices throughout the event

include/globals.h

@@ -113,7 +113,7 @@ extern uint16_t volatile macs_total, macs_wifi, macs_ble,
     batt_voltage;                   // display values
 extern bool volatile TimePulseTick; // 1sec pps flag set by GPS or RTC
 extern timesource_t timeSource;
-extern hw_timer_t *displayIRQ, *ppsIRQ, *gpsIRQ;
+extern hw_timer_t *displayIRQ, *matrixDisplayIRQ, *ppsIRQ, *gpsIRQ;
 extern SemaphoreHandle_t I2Caccess;
 extern TaskHandle_t irqHandlerTask, ClockTask;
 extern TimerHandle_t WifiChanTimer;
@@ -138,6 +138,10 @@ extern time_t volatile gps_pps_time;
 #include "display.h"
 #endif
 
+#ifdef HAS_MATRIX_DISPLAY
+#include "ledmatrixdisplay.h"
+#endif
+
 #ifdef HAS_BUTTON
 #include "button.h"
 #endif

include/irqhandler.h

@@ -3,6 +3,7 @@
 
 #define DISPLAY_IRQ 0x01
 #define BUTTON_IRQ 0x02
+#define MATRIX_DISPLAY_IRQ 0x03
 #define SENDCYCLE_IRQ 0x04
 #define CYCLIC_IRQ 0x08
 #define TIMESYNC_IRQ 0x10
@@ -23,6 +24,10 @@ int unmask_user_IRQ();
 void IRAM_ATTR DisplayIRQ();
 #endif
 
+#ifdef HAS_MATRIX_DISPLAY
+void IRAM_ATTR MatrixDisplayIRQ();
+#endif
+
 #ifdef HAS_BUTTON
 void IRAM_ATTR ButtonIRQ();
 #endif

include/ledmatrixdisplay.h

@@ -0,0 +1,17 @@
+#ifndef _MATRIX_DISPLAY_H
+#define _MATRIX_DISPLAY_H
+
+#include "LEDMatrix.h"
+#include "ledmatrixfonts.h"
+
+extern uint8_t MatrixDisplayIsOn;
+
+extern LEDMatrix matrix;
+
+void init_matrix_display(const char *Productname, const char *Version);
+void refreshTheMatrixDisplay(void);
+void DrawNumber(String strNum, uint8_t iDotPos = 0);
+uint8_t GetCharFromFont(char cChar);
+uint8_t GetCharWidth(char cChar);
+
+#endif

include/ledmatrixfonts.h

@@ -0,0 +1,40 @@
+// Fonts.h
+
+#ifndef _FONTS_h
+#define _FONTS_h
+
+#include "Arduino.h"
+
+struct FONT_CHAR_INFO {
+  uint8_t width; // width in bits
+  uint8_t height;
+  uint16_t offset; // offset of char into char array
+};
+
+struct FONT_INFO {
+  uint8_t CharHeight;
+  char StartChar;
+  char EndChar;
+  uint8_t SpaceWidth;
+  const FONT_CHAR_INFO *Descriptors;
+  const uint8_t *Bitmap;
+};
+
+// Font data for Microsoft Sans Serif 11pt
+extern const uint8_t arialNarrow_17ptBitmaps[];
+
+extern const uint8_t gillSansMTCondensed_18ptBitmaps[];
+extern const FONT_INFO gillSansMTCondensed_18ptFontInfo;
+extern const FONT_CHAR_INFO gillSansMTCondensed_18ptDescriptors[];
+
+// Font data for Gill Sans MT Condensed 16pt
+extern const uint8_t gillSansMTCondensed_16ptBitmaps[];
+extern const FONT_INFO gillSansMTCondensed_16ptFontInfo;
+extern const FONT_CHAR_INFO gillSansMTCondensed_16ptDescriptors[];
+
+// Font data for Digital-7 18pt
+extern const uint8_t digital7_18ptBitmaps[];
+extern const FONT_INFO digital7_18ptFontInfo;
+extern const FONT_CHAR_INFO digital7_18ptDescriptors[];
+
+#endif