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fix conditions, add ien flag, improve keyboard, add gpio

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Redo
2023-01-04 13:29:55 -06:00
parent 4af6f46a51
commit b75ff48300
8 changed files with 160 additions and 53 deletions
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emulator/8608emulator.c
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@@ -42,7 +42,7 @@
#define ldi cpu->instr = readmemory(cpu->i); cpu->cycle = 0;
#define addf(x,y) { x=(x+y); cpu->cf=x>=256; x&=0xFF; setzf(x); }
#define subf(x,y) addf(x,-y);
#define cmpf(x,y) { int t=x-y; cpu->cf=(t>=256); setzf(t); }
#define cmpf(x,y) { int t=x-y; cpu->cf=(t<0); setzf(t); }
#define rol(x,y) x=(x<<y)|(x>>(8-y));
#define ror(x,y) x=(x>>y)|(x<<(8-y));
#define sra(x,y) x=(x>>y);
@@ -80,6 +80,7 @@ struct CPU {
int irq;
int ifg;
int rfg;
int ien;
int instr;
int cycle;
int instrpre;
@@ -130,14 +131,15 @@ typedef void(*CPUInstruction)(struct CPU* const cpu, struct Memory* const mem);
#include "instructions_gen.c"
int TickCPU(struct CPU* const cpu, struct Memory* const mem, const int count, const int countinstrs) {
int TickCPU(struct CPU* const cpu, struct Memory* const mem, const int count, const int countinstrs, const int breakaddr) {
int i = 0;
while(i<count) {
if(cpu->irq && !cpu->ifg && cpu->cycle==0) { cpu->instr = 0xF2; }
if(cpu->irq && !cpu->ifg && cpu->cycle==0 && cpu->ien) { cpu->instr = 0xF2; }
if(cpu->rfg || cpu->ifg || cpu->irq) {
CPUInstruction instr = CPUInstructions[cpu->instr][cpu->cycle];
if(instr) instr(cpu, mem);
if(!countinstrs || cpu->cycle==0) { i++; }
if(cpu->i==breakaddr) { i = count; break; }
} else { i = count; break; }
if(mem->numevents!=0) { break; }
}