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| author | Manuel Palenzuela <manuelpalenzuelamerino@gmail.com> | 2021-07-20 20:25:46 +0100 |
|---|---|---|
| committer | Manuel Palenzuela <manuelpalenzuelamerino@gmail.com> | 2021-07-20 20:25:46 +0100 |
| commit | 4c7b24ac423d98caa4198c6480f80ed3b8470501 (patch) | |
| tree | 7aabbb6dc310c2929ab42dd7a9b2e8208957d840 /emulator.c | |
| parent | Roms: Added the demo rom 'sierpinski' (diff) | |
| download | CHIP8-Emulator-4c7b24ac423d98caa4198c6480f80ed3b8470501.tar.gz CHIP8-Emulator-4c7b24ac423d98caa4198c6480f80ed3b8470501.tar.bz2 CHIP8-Emulator-4c7b24ac423d98caa4198c6480f80ed3b8470501.zip | |
Feature: Implemented various instructions
Diffstat (limited to 'emulator.c')
| -rw-r--r-- | emulator.c | 38 |
1 files changed, 32 insertions, 6 deletions
diff --git a/emulator.c b/emulator.c index b46e870..b843c3f 100644 --- a/emulator.c +++ b/emulator.c @@ -153,9 +153,11 @@ int emulator_tick(Emulator* emulator) break; case 0x1: case 0x2: + printf("TODO: Instr: 0x%x -- %d\n", instr, N); + assert(0); + break; case 0x3: - printf("TODO: Instr: 0x%x -- %d\n", instr, N); - assert(0); + emulator->regs.V[X] ^= emulator->regs.V[Y]; break; case 0x4: dbgprintf("ADD VY TO VX!\n"); @@ -164,10 +166,22 @@ int emulator_tick(Emulator* emulator) else emulator->regs.VF = 0; + /* + * emulator->regs.V[X] += emulator->regs.V[Y]; + if(emulator->regs.V[Y] > emulator->regs.V[X]) + emulator->regs.VF = 1; //carry + else + emulator->regs.VF = 0; //carry*/ + emulator->regs.V[X] += emulator->regs.V[Y]; break; case 0x5: - emulator->regs.V[X] -= emulator->regs.V[Y]; + if(emulator->regs.V[X] > emulator->regs.V[Y]) + emulator->regs.VF = 1; + else + emulator->regs.VF = 0; + + emulator->regs.V[X] -= emulator->regs.V[Y]; break; case 0x6: case 0xE: @@ -226,17 +240,26 @@ int emulator_tick(Emulator* emulator) assert(0); break; case 0xF: - switch(N) + switch(NN) { - case 0xE: //FX1E + case 0x1E: //FX1E dbgprintf("ADD V[X] to the I register!\n"); + if(emulator->regs.I + emulator->regs.V[X] > 0xFFF) + emulator->regs.VF = 1; + else + emulator->regs.VF = 0; emulator->regs.I += emulator->regs.V[X]; break; - case 0x5: //FX55 + case 0x55: //FX55 for (int i = 0; i <= X; ++i) emulator->memory[emulator->regs.I + i] = emulator->regs.V[i]; emulator->regs.I += X + 1; break; + case 0x65: //FX65 + for (int i = 0; i <= X; ++i) + emulator->regs.V[i] = emulator->memory[emulator->regs.I + i]; + emulator->regs.I += X + 1; + break; default: printf("DEFAULT: Instr: 0x%x\n", instr); assert(0); @@ -250,6 +273,9 @@ int emulator_tick(Emulator* emulator) dbgprintf("\n"); + if(DEBUG) + emulator_dump_registers(emulator); + return 0; } |