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;