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This commit is contained in:
Loïc Guégan 2023-12-25 07:30:17 +01:00
parent 475996af26
commit 001e18b3d4
1 changed files with 24 additions and 8 deletions
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32
src/vcpu.c
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@ -13,7 +13,7 @@ unsigned short S;
// General purpose registers (8 bits each)
// Note last one often used as a flag register
unsigned char R[16];
unsigned char V[16];
// Delay timer (8 bits)
unsigned char DT;
@ -34,19 +34,35 @@ void VCPUFetch(){
}
void VCPUDecode(){
char X=(State.opcode<<4) & 0xF0;
char Y=(State.opcode<<8) & 0xF0;
char N=(State.opcode<<12) & 0xF0;
char NN=(State.opcode<<8) & 0xFF;
short NNN=(State.opcode<<4) & 0xFFF0;
State.X=(State.opcode<<4) & 0xF0;
State.Y=(State.opcode<<8) & 0xF0;
State.N=(State.opcode<<12) & 0xF0;
State.NN=(State.opcode<<8) & 0xFF;
State.NNN=(State.opcode<<4) & 0xFFF0;
}
void VCPUExecute(){
switch(State.opcode){
case 0x00E0:
switch(State.opcode & 0xF){
case 0x0:
ScreenClear();
break
;;
case 0x1:
PC=State.NNN;
break
;;
case 0x6:
V[State.X]=State.NN;
break
;;
case 0x7:
V[State.X]+=State.NN;
break
;;
case 0xA:
I=State.NNN;
break
;;
}
}