main.cpp

00001 #include "mbed.h"
00002 #include "GD.h"
00003 #include "arduino.h"
00004 #include "shield.h"
00005 
00006 GDClass GD(ARD_MOSI, ARD_MISO, ARD_SCK, ARD_D9, USBTX, USBRX) ;
00007 SPI spimain(ARD_MOSI, ARD_MISO, ARD_SCK); // mosi, miso, sclk
00008 #define PI 3.1415926535
00009 
00010 void readn(byte *dst, unsigned int addr, int c) {
00011     GD.__start(addr);
00012     while (c--)
00013         *dst++ = spimain.write(0);
00014     GD.__end();
00015 }
00016 
00017 static byte coll[256];
00018 static void load_coll() {
00019     while (GD.rd(VBLANK) == 0)  // Wait until vblank
00020         ;
00021     while (GD.rd(VBLANK) == 1)  // Wait until display
00022         ;
00023     while (GD.rd(VBLANK) == 0)  // Wait until vblank
00024         ;
00025     readn(coll, COLLISION, sizeof(coll));
00026 }
00027 
00028 void setup() {
00029     int i;
00030 
00031     GD.begin();
00032 
00033     GD.wr(JK_MODE, 1);
00034     GD.wr16(RAM_PAL, RGB(255,255,255));
00035 
00036     // Use the 4 palettes:
00037     // 0 pink, for J sprites
00038     // 1 green, for K sprites
00039     // 2 dark pink, J collisions
00040     // 3 dark green, K collisions
00041     for (i = 0; i < 256; i++) {
00042         GD.wr16(RAM_SPRPAL + (0 * 512) + (i << 1), RGB(255, 0, 255));
00043         GD.wr16(RAM_SPRPAL + (1 * 512) + (i << 1), RGB(0, 255, 0));
00044         GD.wr16(RAM_SPRPAL + (2 * 512) + (i << 1), RGB(100, 0, 100));
00045         GD.wr16(RAM_SPRPAL + (3 * 512) + (i << 1), RGB(0, 100, 0));
00046     }
00047 }
00048 
00049 byte spr;
00050 static void polar(float th, int r, byte jk) {
00051     // add 2 to the palette if this sprite is colliding
00052     byte colliding = coll[spr] != 0xff;
00053     GD.sprite(spr, 200 + int(r * sin(th)), 142 + int(r * cos(th)), 0, jk + (colliding ? 2 : 0), 0, jk);
00054     spr++;
00055 }
00056 Timer timer;
00057 int main() {
00058     
00059     timer.start();
00060     setup();
00061     byte i;
00062     float th;
00063     while (1) {
00064         spr = 0;
00065         // draw the J sprites (pink)
00066         for (i = 0; i < 5; i++) {
00067             th = (((timer.read_us()+2147)/500) / 3000.) + 2 * PI * i / 5;
00068             polar(th, 134, 0);
00069         }
00070         // draw the K sprites (green)
00071         randomSeed(4);
00072         for (i = 0; i < 17; i++) {
00073             th = (((timer.read_us()+2147)/500) / float((rand()%2000)+1000)) + 2 * PI * i / 17;
00074             polar(th, 134, 1);
00075         }
00076         load_coll();
00077     }
00078 }
00079