initial commit!

libs/libgccvb/controller.c

@@ -0,0 +1,40 @@
+#include "types.h"
+#include "hw.h"
+#include "controller.h"
+
+
+u16 oldkeydown = 0x0000;
+u16 oldkeyup = 0x0000;
+
+
+/* Reads the keypad, returns the 16 button bits */
+u16 vbReadPad()
+{
+	HW_REGS[SCR] = (S_INTDIS | S_HW);
+	while (HW_REGS[SCR] & S_STAT);
+	return (HW_REGS[SDHR] << 8) | HW_REGS[SDLR];
+}
+
+/* Check if a button has been pressed since the last read. If button state matches last read, it is returned as 'off' */
+u16 vbPadKeyDown() 
+{
+	u16 keystate,keydown;
+
+	keystate = vbReadPad() & K_ANY;
+	keydown = (oldkeydown & keystate) ^ keystate;
+	oldkeydown = keystate;
+
+	return keydown;
+}
+
+/* Check if a button has been released since the last read. If button state matches last read, it is returned as 'off'  */
+u16 vbPadKeyUp() 
+{
+	u16 keystate,keyup;
+
+	keystate = vbReadPad() & K_ANY;
+	keyup = (oldkeyup & ~keystate);
+	oldkeyup = keystate;
+
+	return keyup;
+}