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#include "mem.h"
#include <stdio.h>
unsigned char memory[4096];
extern unsigned char DEFAULT_FONT[];
void MemInit(){
MemSet(0,0,4096);
MemStore(DEFAULT_FONT,16*5,ADDR_FONT);
}
void MemSet(int addr, unsigned char value, int size){
for(int i=0;i<size;i++)
memory[addr+i]=value;
}
void MemStore(unsigned char *data, int size, int addr){
for(int i=0;i<size;i++){
if(addr+i>4096){
printf("Illegal memory access (store): addr=%d\n",addr+i);
return;
}
memory[addr+i]=data[i];
}
}
void MemLoad(unsigned char *data, int size, int addr){
int location=addr;
for(int i=0;i<size;i++){
if(addr+i>4096){
printf("Illegal memory access (load): addr=%d\n",addr+i);
return;
}
data[i]=memory[addr+i];
}
}
void MemLoadROM(char *path){
char byte;
FILE *ptr;
ptr=fopen(path,"rb");
int location=ADDR_ROM;
while(fread(&byte,1,1,ptr)==1){
if(location >= 4096)
break;
MemSet(location,byte,1);
location++;
}
fclose(ptr);
}
void MemDump(){
MemDumpRange(0,4096);
}
void MemDumpRange(int from, int size){
for(int addr=from;addr<from+size;addr+=2){
printf("0x%03x: %02x %02x\n",addr,memory[addr], memory[addr+1]);
}
}
unsigned char DEFAULT_FONT[]={
0xF0, 0x90, 0x90, 0x90, 0xF0, // 0
0x20, 0x60, 0x20, 0x20, 0x70, // 1
0xF0, 0x10, 0xF0, 0x80, 0xF0, // 2
0xF0, 0x10, 0xF0, 0x10, 0xF0, // 3
0x90, 0x90, 0xF0, 0x10, 0x10, // 4
0xF0, 0x80, 0xF0, 0x10, 0xF0, // 5
0xF0, 0x80, 0xF0, 0x90, 0xF0, // 6
0xF0, 0x10, 0x20, 0x40, 0x40, // 7
0xF0, 0x90, 0xF0, 0x90, 0xF0, // 8
0xF0, 0x90, 0xF0, 0x10, 0xF0, // 9
0xF0, 0x90, 0xF0, 0x90, 0x90, // A
0xE0, 0x90, 0xE0, 0x90, 0xE0, // B
0xF0, 0x80, 0x80, 0x80, 0xF0, // C
0xE0, 0x90, 0x90, 0x90, 0xE0, // D
0xF0, 0x80, 0xF0, 0x80, 0xF0, // E
0xF0, 0x80, 0xF0, 0x80, 0x80}; // F
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