beginning ppu

lib/io.c

@@ -1,4 +1,8 @@
 #include <io.h>
+#include <timer.h>
+#include <cpu.h>
+#include <dma.h>
+#include <lcd.h>
 
 static char serial_data[2];
 
@@ -11,6 +15,18 @@ u8 io_read(u16 address){
         return serial_data[1];
     }
 
+    if(BETWEEN(address, 0xFF04, 0xFF07)){
+        return timer_read(address);
+    }
+
+    if(BETWEEN(address, 0xFF40, 0xFF4B)){
+        return lcd_read(address);
+    }
+
+    if(address == 0xFF0F) {
+        return cpu_get_int_flags();
+    }
+
     printf("UNSUPPORTED io_read(%04X)\n", address);
     return 0;
 }
@@ -27,6 +43,21 @@ void io_write(u16 address, u8 value){
         return;
     }
 
+    if(BETWEEN(address, 0xFF04, 0xFF07)){
+        timer_write(address, value);
+        return;
+    }
+
+    if(address == 0xFF0F) {
+        cpu_set_int_flags(value);
+        return;
+    }
+
+    if(BETWEEN(address, 0xFF40, 0xFF4B)){
+        lcd_write(address, value);
+        return;
+    }
+
     printf("UNSUPPORTED io_write(%04X)\n", address);
 }