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- #include <SPI.h>
- #include <GD.h>
- #include "splitscreen.h"
- /*
- 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();
- Serial.begin(1000000); // JCB
- 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);
- }
- void loop()
- {
- static int i;
- float th = i / 16.;
- scrollxy(55 + 50 * cos(th), 150 + 50 * sin(th));
- GD.wr16(COMM+12, i);
- i++;
- GD.waitvblank();
- // GD.screenshot(i); // JCB
- }
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