add preliminary apu register support

1 files changed, 10 insertions, 3 deletions

diff --git a/cpu.c b/cpu.c
index 509f7a8..97ece60 100644
--- a/cpu.c
+++ b/cpu.c
@@ -5,10 +5,11 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "apu.h"
 #include "cpu.h"
 #include "opcodes.h"
-#include "rom.h"
 #include "ppu.h"
+#include "rom.h"
 
 #define MAX(a, b)       ((a > b) ? a : b)
 
@@ -53,9 +54,10 @@ peek(uint16_t addr)
                         return rom.prg_rom[addr - 0x8000];
                 else
                         fprintf(stderr, "PRG ROG size is not 0x4000 nor 0x8000\n"), exit(1);
-        } else {
+        } else if ((addr >= 0x4000 && addr <= 0x4013) || addr == 0x4015 || addr == 0x4017)
+                return apu_read(addr);
+        else
                 return memory[addr];
-        }
 }
 
 static uint16_t
@@ -68,6 +70,11 @@ peek16(uint16_t addr)
 static void
 memwrite(uint16_t addr, uint8_t byte)
 {
+        if (addr >= 0x4000 && addr <= 0x4017) {
+                apu_write(addr, byte);
+                return;
+        }
+
         MEMORY_MIRROR(addr);
 
         memory[addr] = byte;