Minor changes

1 files changed, 57 insertions, 0 deletions

diff --git a/src/mem.c b/src/mem.c
new file mode 100644
index 0000000..c537120
--- /dev/null
+++ b/src/mem.c
@@ -0,0 +1,57 @@
+#include "mem.h"
+#include <stdio.h>
+
+unsigned char memory[4096];
+
+extern unsigned char DEFAULT_FONT[];
+
+void MemInit(){
+  MemSet(0,0,4096);
+  MemCopy(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 MemCopy(unsigned char *data, int size, int addr){
+  for(int i=0;i<size;i++)
+    memory[addr+i]=data[i];
+}
+
+void MemRead(unsigned char *data, int size, int addr){
+  int location=addr;
+  for(int i=0;i<size;i++)
+    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){
+    MemSet(location,byte,1);
+    location++;
+  }
+  fclose(ptr);
+}
+
+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