RTC clock

Clock.cpp

@@ -1,10 +1,29 @@
 #include <M5StickC.h>
 #include "Kernel.h"
 #include "EAT.h"
+#include "Util.h"
+
+#define CLOCK_OFFSET_X  1
+#define CLOCK_OFFSET_Y  1
+#define CLOCK_SIZE     78
+#define CLOCK_FACE_COLOUR                 0xAAAAAA
+#define CLOCK_FACE_OUTLINE_COLOUR         0x666666
+#define CLOCK_FACE_OUTLINE_WIDTH          4
+#define CLOCK_FACE_HOUR_MARKER_TOP_COLOUR 0x333333
+#define CLOCK_FACE_HOUR_MARKER_COLOUR     0x666666
+#define CLOCK_FACE_HOUR_MARKER_SIZE       4
+#define CLOCK_HOUR_COLOUR                 0x333333
+#define CLOCK_HOUR_LENGTH                 20
+#define CLOCK_MINUTE_COLOUR               0x666666
+#define CLOCK_MINUTE_LENGTH               25
+
+#define DEGREES_TO_RADIANS 0.0174533
 
 RTC_TimeTypeDef time_to_rtc(char* time);
 RTC_DateTypeDef date_to_rtc(char* date);
-void redraw(RTC_TimeTypeDef time);
+void redraw(RTC_TimeTypeDef time, RTC_DateTypeDef date);
+void draw_face();
+unsigned int rgb_to_colour(unsigned long colour);
 
 int last_minute = -1;
 
@@ -54,19 +73,85 @@ int Clock(int pid, unsigned int signal)
     }
     if (signal & SIGNAL_REDRAW)
     {
-      redraw(time);
+      RTC_DateTypeDef date;
+      M5.Rtc.GetData(&date);
+      redraw(time, date);
     }
   }
   
   return 0;
 }
 
-void redraw(RTC_TimeTypeDef time)
+void draw_face()
+{
+  int center_x = CLOCK_OFFSET_X + (CLOCK_SIZE / 2);
+  int center_y = CLOCK_OFFSET_Y + (CLOCK_SIZE / 2);
+  int radius = CLOCK_SIZE / 2;
+  int inner_radius = radius - (CLOCK_FACE_OUTLINE_WIDTH / 2);
+  
+  // Draw face
+  M5.Lcd.fillCircle(center_x, center_y, radius, rgb_to_colour(CLOCK_FACE_OUTLINE_COLOUR));
+  M5.Lcd.fillCircle(center_x, center_y, inner_radius, rgb_to_colour(CLOCK_FACE_COLOUR));
+    
+  // Draw lines
+  for (int i=0; i<360; i+=(360/12))
+  {
+    // Effectively our polar coordinates are
+    // i,inner_radius -> i,inner_radius-CLOCK_FACE_HOUR_MARKER_SIZE
+
+    int x1 = (inner_radius - CLOCK_FACE_HOUR_MARKER_SIZE) * cos(i * DEGREES_TO_RADIANS);
+    int y1 = (inner_radius - CLOCK_FACE_HOUR_MARKER_SIZE) * sin(i * DEGREES_TO_RADIANS);
+    int x2 = (inner_radius + 1) * cos(i * DEGREES_TO_RADIANS);
+    int y2 = (inner_radius + 1) * sin(i * DEGREES_TO_RADIANS);
+
+    x1 += center_x;
+    x2 += center_x;
+    y1 += center_y;
+    y2 += center_y;
+
+    // 0 degrees = right, draw top at 270
+    M5.Lcd.drawLine(x1, y1, x2, y2, i == 270 ? rgb_to_colour(CLOCK_FACE_HOUR_MARKER_TOP_COLOUR) : rgb_to_colour(CLOCK_FACE_HOUR_MARKER_COLOUR));
+  }
+  
+}
+
+void draw_arm(int angle, int length, unsigned int colour)
 {
-  M5.Lcd.setCursor(0, 40);
-  char time_str[6];
-  sprintf(time_str, "%02d:%02d", time.Hours, time.Minutes);
-  M5.Lcd.print(time_str);
+  angle -= 90;
+  // clock center 
+  int center_x = CLOCK_OFFSET_X + (CLOCK_SIZE / 2);
+  int center_y = CLOCK_OFFSET_Y + (CLOCK_SIZE / 2);
+
+  int x = length * cos(angle * DEGREES_TO_RADIANS);
+  int y = length * sin(angle * DEGREES_TO_RADIANS);
+
+  M5.Lcd.drawLine(center_x, center_y, center_x + x, center_y + y, colour);
+}
+
+void redraw(RTC_TimeTypeDef time, RTC_DateTypeDef date)
+{
+  draw_face();
+
+  // Write date?
+  int center_x = CLOCK_OFFSET_X + (CLOCK_SIZE / 2);
+  int center_y = CLOCK_OFFSET_Y + (CLOCK_SIZE / 2);
+  M5.Lcd.setCursor(center_x + (CLOCK_SIZE / 16), center_y + (CLOCK_SIZE / 6));
+  M5.Lcd.setTextColor(rgb_to_colour(CLOCK_FACE_OUTLINE_COLOUR), rgb_to_colour(CLOCK_FACE_COLOUR));
+  M5.Lcd.print(date.Date);
+  
+  int hour = time.Hours;
+  if (hour > 12) hour -= 12;
+  int minute = time.Minutes;
+  
+  int minute_angle = 360.0 * (minute / 60.0);
+  int hour_angle = (360.0 * (hour / 12.0)) + (minute_angle / 12.0);
+  draw_arm(hour_angle, CLOCK_HOUR_LENGTH, rgb_to_colour(CLOCK_HOUR_COLOUR));
+  draw_arm(minute_angle, CLOCK_MINUTE_LENGTH, rgb_to_colour(CLOCK_MINUTE_COLOUR));
+  
+  //M5.Lcd.setCursor(0, 40);
+  //char time_str[6];
+  //sprintf(time_str, "%02d:%02d", time.Hours, time.Minutes);
+  //M5.Lcd.print(time_str);
 }
 
 RTC_TimeTypeDef time_to_rtc(char* time)