Initial Commit

src/memoryMap.c

@@ -0,0 +1,44 @@
+#include "memoryMap.h"
+
+uint8_t readMemory(uint16_t address, uint8_t *ram, uint8_t *rom) {
+  if (address < RAM_SIZE || address >= IO_BASE + IO_SIZE) { // FIXME: Expanded for debug
+    return ram[address];
+  } else if (address < RAM_SIZE + IO_SIZE) {
+    uint16_t _address = address - RAM_SIZE;
+    switch (_address) {
+      case KEYBOARD_ADDRESS: {
+        return getChar();
+      }
+
+      default:
+        break;
+    }
+
+    return 0;
+  } else {
+    return rom[address - RAM_SIZE - IO_SIZE];
+  }
+}
+
+void writeMemory(uint16_t address, uint8_t value, uint8_t *ram, uint8_t *rom) {
+  if (address < RAM_SIZE) {
+    ram[address] = value;
+  } else if (address < RAM_SIZE + IO_SIZE || address >= IO_BASE + IO_SIZE) { // FIXME: Expanded for debug
+    uint16_t _address = address - RAM_SIZE;
+    switch (_address) {
+      case SCREEN_ADDRESS: {
+        putChar(value);
+        break;
+      }
+
+      default:
+        break;
+    }
+  } else {
+    rom[address - RAM_SIZE - IO_SIZE] = value;
+  }
+}
+
+uint8_t readStack(uint8_t address, uint8_t *ram) { return ram[0x100 + address]; }
+
+void writeStack(uint8_t address, uint8_t value, uint8_t *ram) { ram[0x100 + address] = value; }