Diff: main.cpp

Revision:

0:351171469bf7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Dec 21 14:12:13 2012 +0000
@@ -0,0 +1,62 @@
+#include "mbed.h"
+#include "GD.h"
+
+#include "splitscreen.h"
+#include "shield.h"
+
+GDClass GD(ARD_MOSI, ARD_MISO, ARD_SCK, ARD_D9, USBTX, USBRX) ;
+
+/*
+ For the splitscreen microprogram, the COMM area holds 8 short words
+ that control the 3-way screen split:
+
+ COMM+0   SCROLL_X for top section
+ COMM+2   SCROLL_Y for top section
+ COMM+4   Y-coordinate of start of middle section
+ COMM+6   SCROLL_X for middle section
+ COMM+8   SCROLL_Y for middle section
+ COMM+10  Y-coordinate of start of bottom section
+ COMM+12  SCROLL_X for bottom section
+ COMM+14  SCROLL_Y for bottom section
+*/
+
+#include "splitscreen_graphics.h"
+
+void setup()
+{
+  GD.begin();
+
+  GD.copy(RAM_PIC, splitscreen_pic, sizeof(splitscreen_pic));
+  GD.copy(RAM_CHR, splitscreen_chr, sizeof(splitscreen_chr));
+  GD.copy(RAM_PAL, splitscreen_pal, sizeof(splitscreen_pal));
+
+  GD.wr16(COMM+0, 0);
+  GD.wr16(COMM+2, 0);
+  GD.wr16(COMM+4, 100);   // split at line 100
+  GD.wr16(COMM+6, 0);
+  GD.wr16(COMM+8, 140);
+  GD.wr16(COMM+10, 200);   // split at line 200
+  GD.wr16(COMM+12, 0);
+  GD.wr16(COMM+14, (511 & (82 - 200))); // show line 82 at line 200
+
+  GD.microcode(splitscreen_code, sizeof(splitscreen_code));
+}
+
+// Set the scroll registers for the middle screen secion to (x, y)
+static void scrollxy(uint16_t x, uint16_t y)
+{
+  GD.wr16(COMM+6, x);
+  GD.wr16(COMM+8, y);
+}
+
+int main()
+{
+setup();
+while (1){
+  static int i;
+  float th = i / 16.;
+  scrollxy(55 + 50 * cos(th), 150 + 50 * sin(th));
+  GD.wr16(COMM+12, i);
+  i++;
+  GD.waitvblank();
+}}
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