43 lines
877 B
C
43 lines
877 B
C
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#include "nes.h"
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unsigned char index;
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const unsigned char TEXT[]={"Hello PPU!!!"};
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const unsigned char PALETTE[]={0x1, 0x00, 0x10, 0x20}; //blue, gray, lt gray, white
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void main (void) {
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// turn off the screen
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PPU.control = 0;
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PPU.mask = 0;
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// load the palette
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PPU.vram.address = 0x3f;
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PPU.vram.address = 0x0;
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for(index = 0; index < sizeof(PALETTE); ++index){
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PPU.vram.data = PALETTE[index];
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}
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// load the text
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PPU.vram.address = 0x21; // set an address in the PPU of 0x21ca
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PPU.vram.address = 0xca; // about the middle of the screen
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for( index = 0; index < sizeof(TEXT); ++index ){
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PPU.vram.data = TEXT[index];
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}
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// reset the scroll position
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PPU.vram.address = 0x20;
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PPU.vram.address = 0x0;
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PPU.scroll = 0;
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PPU.scroll = 0;
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// turn on screen
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PPU.control = 0x80; // NMI on
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PPU.mask = 0x1e; // screen on
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// infinite loop
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while (1);
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}
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