implement read and _is_noval functions for buttons, button value 2 is now...

implement read and _is_noval functions for buttons, button value 2 is now interpreted as NoVal in AF3, reset button values after reading for each clock
refs 7795

org.fortiss.af3.platform.raspberry/trunk/lib/src/Gamepad.c

@@ -68,9 +68,23 @@ GEN_TYPE_boolean gp_terminated = false;
 void gp_init() {
     // important, since all btns are accessing the same method
     if(gp_initialized) return;
-
+	
+	// Initialize Joystick Inputs to 0
+	ie.btns.js1_ud = 0;
+	ie.btns.js2_lr = 0;
+	ie.btns.js2_ud = 0;
+	
+	// Initialize Button inputs to NoVal
+	ie.btns.bt_tri = 2;
+	ie.btns.bt_cir = 2;
+	ie.btns.bt_x = 2;
+	ie.btns.bt_sqr = 2;
+	ie.btns.bt_l1 = 2;
+	ie.btns.bt_l2 = 2;
+	ie.btns.bt_r1 = 2;
+	ie.btns.bt_r2 = 2;
+	
     gp_initialized = true;
-    // TODO initialize...
 }
 
 void gp_term() {
@@ -81,37 +95,110 @@ void gp_term() {
     gp_is_running = false;
 }
 
-// readers
+// readers: Return button values (1 is true, 0 is false, 2 is NoVal)
+// important: Reset button values to NoVal after reading
 GEN_TYPE_boolean gp_btn1_read() {
-    return ie.btns.bt_tri;
+    if (ie.btns.bt_tri == 1)
+	{
+		ie.btns.bt_tri = 2;
+		return 1;
+	}
+	else
+	{
+		ie.btns.bt_tri = 2;
+		return 0;
+	}
 }
 
 GEN_TYPE_boolean gp_btn2_read() {
-    return ie.btns.bt_cir;
+    if (ie.btns.bt_cir == 1)
+	{
+		ie.btns.bt_cir = 2;
+		return 1;
+	}
+	else
+	{
+		ie.btns.bt_cir = 2;
+		return 0;
+	}
 }
 
 GEN_TYPE_boolean gp_btn3_read() {
-    return ie.btns.bt_x;
+    if (ie.btns.bt_x == 1)
+	{
+		ie.btns.bt_x = 2;
+		return 1;
+	}
+	else
+	{
+		ie.btns.bt_x = 2;
+		return 0;
+	}
 }
 
 GEN_TYPE_boolean gp_btn4_read() {
-    return ie.btns.bt_sqr;
+    if (ie.btns.bt_sqr == 1)
+	{
+		ie.btns.bt_sqr = 2;
+		return 1;
+	}
+	else
+	{
+		ie.btns.bt_sqr = 2;
+		return 0;
+	}
 }
 
 GEN_TYPE_boolean gp_btnL1_read() {
-    return ie.btns.bt_l1;
+    if (ie.btns.bt_l1 == 1)
+	{
+		ie.btns.bt_l1 = 2;
+		return 1;
+	}
+	else
+	{
+		ie.btns.bt_l1 = 2;
+		return 0;
+	}
 }
 
 GEN_TYPE_boolean gp_btnL2_read() {
-    return ie.btns.bt_l2;
+    if (ie.btns.bt_l2 == 1)
+	{
+		ie.btns.bt_l2 = 2;
+		return 1;
+	}
+	else
+	{
+		ie.btns.bt_l2 = 2;
+		return 0;
+	}
 }
 
 GEN_TYPE_boolean gp_btnR1_read() {
-    return ie.btns.bt_r1;
+    if (ie.btns.bt_r1 == 1)
+	{
+		ie.btns.bt_r1 = 2;
+		return 1;
+	}
+	else
+	{
+		ie.btns.bt_r1 = 2;
+		return 0;
+	}
 }
 
 GEN_TYPE_boolean gp_btnR2_read() {
-    return ie.btns.bt_r2;
+    if (ie.btns.bt_r2 == 1)
+	{
+		ie.btns.bt_r2 = 2;
+		return 1;
+	}
+	else
+	{
+		ie.btns.bt_r2 = 2;
+		return 0;
+	}
 }
 
 GEN_TYPE_double gp_btnLX_read() {
@@ -132,35 +219,43 @@ GEN_TYPE_double gp_btnRY_read() {
 
 // noval
 GEN_TYPE_boolean gp_btn1_is_noval() {
-    return false;
+    if (ie.btns.bt_tri == 2) return 1;
+	return 0;
 }
 
 GEN_TYPE_boolean gp_btn2_is_noval() {
-    return false;
+    if (ie.btns.bt_cir == 2) return 1;
+	return 0;
 }
 
 GEN_TYPE_boolean gp_btn3_is_noval() {
-    return false;
+    if (ie.btns.bt_x == 2) return 1;
+	return 0;
 }
 
 GEN_TYPE_boolean gp_btn4_is_noval() {
-    return false;
+    if (ie.btns.bt_sqr == 2) return 1;
+	return 0;
 }
 
 GEN_TYPE_boolean gp_btnL1_is_noval() {
-    return false;
+    if (ie.btns.bt_l1 == 2) return 1;
+	return 0;
 }
 
 GEN_TYPE_boolean gp_btnL2_is_noval() {
-    return false;
+    if (ie.btns.bt_l2 == 2) return 1;
+	return 0;
 }
 
 GEN_TYPE_boolean gp_btnR1_is_noval() {
-    return false;
+    if (ie.btns.bt_r1 == 2) return 1;
+	return 0;
 }
 
 GEN_TYPE_boolean gp_btnR2_is_noval() {
-    return false;
+    if (ie.btns.bt_r2 == 2) return 1;
+	return 0;
 }
 
 GEN_TYPE_boolean gp_btnLX_is_noval() {