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a few more opcodes, no flags changed yet

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This commit is contained in:
Matt Laux 2019-04-16 01:44:34 -05:00
parent b52d5ce100
commit c428a15a9d
1 changed files with 18 additions and 0 deletions
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18
src/cpu.c
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@ -78,6 +78,11 @@ static inline u16 read16(struct cpu *cpu, u16 address)
return high << 8 | low;
}
static inline void write8(struct cpu *cpu, u16 address, u8 data)
{
cpu->mem_write(cpu->mem_model, address, data);
}
void cpu_step(struct cpu *cpu)
{
u8 opc = cpu->mem_read(cpu->mem_model, cpu->pc);
@ -85,10 +90,23 @@ void cpu_step(struct cpu *cpu)
case 0: // NOP
cpu->pc++;
break;
case 0x06: // LD B, d8
cpu->b = read8(cpu, cpu->pc + 1);
cpu->pc += 2;
break;
case 0x0e: // LD C, d8
cpu->c = read8(cpu, cpu->pc + 1);
cpu->pc += 2;
break;
case 0x21: // LD HL, d16
write_hl(cpu, read16(cpu, cpu->pc + 1));
cpu->pc += 3;
break;
case 0x32: // LD (HL-), A
write8(cpu, read_hl(cpu), cpu->a);
write_hl(cpu, read_hl(cpu) - 1);
cpu->pc++;
break;
case 0xc3: // JP a16
cpu->pc = read16(cpu, cpu->pc + 1);
break;