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Loïc Guégan 2023-12-25 09:22:19 +01:00
parent 16f7128a0c
commit 02574531db
1 changed files with 15 additions and 5 deletions
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20
src/vcpu.c
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@ -20,14 +20,19 @@ void VCPUFetch(){
} }
void VCPUDecode(){ void VCPUDecode(){
State.X=(State.opcode<<4) & 0xF0; State.X=(State.opcode>>8) & 0xF;
State.Y=(State.opcode<<8) & 0xF0; State.Y=(State.opcode>>4) & 0xF;
State.N=(State.opcode<<12) & 0xF0; State.N=State.opcode & 0xF;
State.NN=(State.opcode<<8) & 0xFF;
State.NNN=(State.opcode<<4) & 0xFFF0; State.NN=State.Y;
State.NN=State.NN<<4;
State.NN=State.NN | State.N;
State.NNN=State.opcode&0x0FFF;
} }
void VCPUExecute(){ void VCPUExecute(){
// VCPUDump();
switch(State.opcode >> 12){ switch(State.opcode >> 12){
case 0x0: case 0x0:
ScreenClear(); ScreenClear();
@ -63,4 +68,9 @@ void VCPUExecute(){
void VCPUDump(){ void VCPUDump(){
printf("opcode: 0x%04x\n",State.opcode&0xFFFF); printf("opcode: 0x%04x\n",State.opcode&0xFFFF);
printf("X: 0x%01x\n",State.X);
printf("Y: 0x%01x\n",State.Y);
printf("N: 0x%01x\n",State.N);
printf("NN: 0x%02x\n",State.NN);
printf("NNN: 0x%03x\n",State.NNN);
} }