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chip8
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Implemented getkey instructions

This commit is contained in:
Vinicius Silva 2024-03-04 21:02:17 -03:00
parent 9ae2ca642f
commit f356a0ab7c
3 changed files with 228 additions and 18 deletions
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12
include/chip8.h
View File

@ -13,6 +13,15 @@
#define FONT_SIZE 16
#define REG_SIZE 16
#define STACK_SIZE 16
#define KEYMAP_SIZE 16
int keymap[KEYMAP_SIZE] = {
49, 50, 51,67, // 1 2 3 C
52, 68, 55, 56, // 4 5 6 D
57, 58, 59, 69, // 7 8 9 E
65,79, 66, 70,// A O B F
};
int font[FONT_SIZE][SPRITE_SIZE] = {
{0xF0, 0x90, 0x90, 0x90, 0xF0}, // 0
@ -44,9 +53,12 @@ typedef struct Chip8{
uint16_t PC;
int SP;
uint16_t* chip8_stack;
uint8_t key;
}Chip8;
void push(Chip8* chip8, uint16_t value);
uint16_t pop(Chip8* chip8);
void set_key(Chip8 *chip8, uint8_t key_pressed);
void reset_key(Chip8 *chip8);
#endif // __CHIP8_H__

192
src/chip8.c
View File

@ -1,4 +1,4 @@
#include "../include/chip8.h"
#include "../include/instructions.h"
#include <stdint.h>
#include <stdlib.h>
@ -75,10 +75,11 @@ void run(Chip8 *chip8, uint16_t instruction)
switch (instruction & 0x00FF) {
case 0xE0:
__00E0(chip8); // Display clear
break;
case 0xEE:
__00EE(chip8); // Returns from a subroutine
break;
default:
@ -89,31 +90,43 @@ void run(Chip8 *chip8, uint16_t instruction)
case 0x1000:
nnn = instruction & 0x0FFF;
__1NNN(chip8, nnn);
break;
case 0x2000:
nnn = instruction & 0x0FFF;
__2NNN(chip8, nnn);
break;
case 0x3000:
x = (instruction & 0x0F00) >> 8;
nn = instruction & 0x00FF;
__3XNN(chip8, x, nn);
break;
case 0x4000:
x = (instruction & 0x0F00) >> 8;
nn = instruction & 0x00FF;
__4XNN(chip8,x,nn);
break;
case 0x5000:
x = (instruction & 0x0F00) >> 8;
y = (instruction & 0x00F0) >> 4;
__5XY0(chip8,x,y);
break;
case 0x6000:
x = (instruction & 0x0F00) >> 8;
y = (instruction & 0x00F0) >> 4;
__6XNN(chip8, x, nn);
break;
case 0x7000:
x = (instruction & 0x0F00) >> 8;
nn = instruction & 0x00FF;
__7XNN(chip8, x, nn);
break;
case 0x8000:
@ -121,30 +134,57 @@ void run(Chip8 *chip8, uint16_t instruction)
switch (instruction & 0x000F) {
case 0x0:
x = (instruction & 0x0F00) >> 8;
y = (instruction & 0x00F0) >> 4;
__8XY0(chip8, x, y);
break;
case 0x1:
x = (instruction & 0x0F00) >> 8;
y = (instruction & 0x00F0) >> 4;
__8XY1(chip8, x, y);
break;
case 0x2:
x = (instruction & 0x0F00) >> 8;
y = (instruction & 0x00F0) >> 4;
__8XY2(chip8, x, y);
break;
case 0x3:
x = (instruction & 0x0F00) >> 8;
y = (instruction & 0x00F0) >> 4;
__8XY3(chip8, x, y);
break;
case 0x4:
x = (instruction & 0x0F00) >> 8;
y = (instruction & 0x00F0) >> 4;
__8XY4(chip8, x, y);
break;
case 0x5:
x = (instruction & 0x0F00) >> 8;
y = (instruction & 0x00F0) >> 4;
__8XY5(chip8, x, y);
break;
case 0x6:
x = (instruction & 0x0F00) >> 8;
y = (instruction & 0x00F0) >> 4;
__8XY6(chip8, x, y);
break;
case 0x7:
x = (instruction & 0x0F00) >> 8;
y = (instruction & 0x00F0) >> 4;
__8XY7(chip8, x, y);
break;
case 0xE:
x = (instruction & 0x0F00) >> 8;
y = (instruction & 0x00F0) >> 4;
__8XYE(chip8, x, y);
break;
default:
@ -154,18 +194,32 @@ void run(Chip8 *chip8, uint16_t instruction)
break;
case 0x9000:
x = (instruction & 0x0F00) >> 8;
y = (instruction & 0x00F0) >> 4;
__9XY0(chip8, x, y);
break;
case 0xA000:
nnn = instruction & 0x0FFF;
__ANNN(chip8, nnn);
break;
case 0xB000:
nnn = instruction & 0x0FFF;
__BNNN(chip8, nnn);
break;
case 0xC000:
x = (instruction & 0x0F00) >> 8;
nn = instruction & 0x00FF;
__CXNN(chip8, x, nn);
break;
case 0xD000:
x = (instruction & 0x0F00) >> 8;
y = (instruction & 0x00F0) >> 4;
n = (instruction & 0x000F);
__DXYN(chip8, x, y, n);
break;
case 0xE000:
@ -173,9 +227,13 @@ void run(Chip8 *chip8, uint16_t instruction)
switch (instruction & 0x00FF) {
case 0x9E:
x = (instruction & 0x0F00) >> 8;
__EX9E(chip8, x);
break;
case 0xA1:
x = (instruction & 0x0F00) >> 8;
__EXA1(chip8, x);
break;
default:
@ -188,30 +246,48 @@ void run(Chip8 *chip8, uint16_t instruction)
switch (instruction & 0x00FF) {
case 0x07:
x = (instruction & 0x0F00) >> 8;
__FX07(chip8, x);
break;
case 0x0A:
x = (instruction & 0x0F00) >> 8;
__FX0A(chip8, x);
break;
case 0x15:
x = (instruction & 0x0F00) >> 8;
__FX15(chip8, x);
break;
case 0x18:
x = (instruction & 0x0F00) >> 8;
__FX18(chip8, x);
break;
case 0x1E:
x = (instruction & 0x0F00) >> 8;
__FX15(chip8, x);
break;
case 0x29:
x = (instruction & 0x0F00) >> 8;
__FX29(chip8, x);
break;
case 0x33:
x = (instruction & 0x0F00) >> 8;
__FX33(chip8, x);
break;
case 0x55:
x = (instruction & 0x0F00) >> 8;
__FX55(chip8, x);
break;
case 0x65:
x = (instruction & 0x0F00) >> 8;
__FX65(chip8, x);
break;
default:
@ -225,3 +301,101 @@ void run(Chip8 *chip8, uint16_t instruction)
}
}
void set_key(Chip8 *chip8,uint8_t key_pressed)
{
switch (key_pressed) {
case 0x31:
chip8->key = keymap[0];
break;
case 0x32:
chip8->key = keymap[1];
break;
case 0x33:
chip8->key = keymap[2];
break;
case 0x34:
chip8->key = keymap[3];
break;
case 0x51:
chip8->key = keymap[4];
break;
case 0x71:
chip8->key = keymap[4];
break;
case 0x57:
chip8->key = keymap[5];
break;
case 0x77:
chip8->key = keymap[5];
break;
case 0x45:
chip8->key = keymap[6];
break;
case 0x65:
chip8->key = keymap[6];
break;
case 0x52:
chip8->key = keymap[7];
break;
case 0x72:
chip8->key = keymap[7];
break;
case 0x41:
chip8->key = keymap[8];
break;
case 0x61:
chip8->key = keymap[8];
break;
case 0x53:
chip8->key = keymap[9];
break;
case 0x73:
chip8->key = keymap[9];
break;
case 0x44:
chip8->key = keymap[10];
break;
case 0x64:
chip8->key = keymap[10];
break;
case 0x46:
chip8->key = keymap[11];
break;
case 0x66:
chip8->key = keymap[11];
break;
case 0x5A:
chip8->key = keymap[12];
break;
case 0x7A:
chip8->key = keymap[12];
break;
case 0x58:
chip8->key = keymap[13];
break;
case 0x78:
chip8->key = keymap[13];
break;
case 0x43:
chip8->key = keymap[14];
break;
case 0X63:
chip8->key = keymap[14];
break;
case 0x56:
chip8->key = keymap[15];
break;
case 0X76:
chip8->key = keymap[15];
break;
default:
panic("Key pressed is invalid!");
}
}
void reset_key(Chip8 *chip8)
{
chip8->key = 0;
}

40
src/instructions.c
View File

@ -129,37 +129,55 @@ void __CXNN(Chip8 *chip8, uint8_t x, uint8_t nn)
void __DXYN(Chip8 *chip8, uint8_t x, uint8_t y, uint8_t n)
{
uint8_t x_coord = (chip8->V[x] % DISPLAY_WIDTH);
uint8_t y_coord = (chip8->V[y] % DISPLAY_HEIGHT);
chip8->V[F] = 0;
for(int i = 0; i < n; i++)
{
uint8_t pixel = chip8->RAM[chip8->I + n];
for(int j = 0; j < 8; j++)
{
if(pixel == 1 && chip8->display[y_coord + i][x_coord + j] == 1)
{
chip8->display[y_coord + i][x_coord + j] == 0;
chip8->V[F] = 1;
}
}
}
}
void __EX9E(Chip8 *chip8, uint8_t x)
{
if(chip8->key == chip8->V[x]){ chip8->PC += 2; }
}
void __EXA1(Chip8 *chip8, uint8_t x)
{
if(chip8->key != chip8->V[x]){ chip8->PC += 2; }
}
void __FX07(Chip8 *chip8, uint8_t x)
{
chip8->V[x] = chip8->delay_timer;
}
void __FX0A(Chip8 *chip8, uint8_t x)
{
chip8->V[x] = chip8->key;
}
void __FX15(Chip8 *chip8, uint8_t x)
{
chip8->delay_timer = chip8->V[x];
}
void __FX18(Chip8 *chip8, uint8_t x)
{
chip8->sound_timer = chip8->V[x];
}
void __FX1E(Chip8 *chip8, uint8_t x)
@ -179,12 +197,18 @@ void __FX33(Chip8 *chip8, uint8_t x)
void __FX55(Chip8 *chip8, uint8_t x)
{
for(int i = 0; i <= x; i++)
{
chip8->RAM[chip8->I + i] = chip8->V[i];
}
}
void __FX65(Chip8 *chip8, uint8_t x)
{
for(int i = 0; i <= x; i++)
{
chip8->V[i] = chip8->RAM[chip8->I + i];
}
}