API Demo: set D-Pad to player number

Testing the received data and callback

Author: dmadison

extras/API-Demo/API-Demo.ino

@@ -44,38 +44,63 @@
 #else
 
 uint8_t txData[20] = { 0x00, 0x14, 0x00 };
-uint8_t rxData[8]  = { 0x00 };
-
 boolean buttonState = false;
 
+volatile uint8_t rxData[8]  = { 0x00 };
+volatile uint8_t playerNum = 0;
+
 void setup() {
 	while (!XInputUSB::connected()) {}  // wait for connection
 	XInputUSB::setRecvCallback(receiveCallback);
 }
 
 void loop() {
+	// Set D-PAD based on player number (test receive)
+	const uint8_t pNum = playerNum;
+	if (pNum != 0) {
+		setPlayerControl(pNum);
+		playerNum = 0;
+	}
+
+	// Toggle button 'A' (test send)
 	buttonState = !buttonState;
-	setButtonA(txData, buttonState);
+	setButtonA(buttonState);
 	XInputUSB::send(txData, sizeof(txData));
 
 	delay(1000);
 }
 
-void setButtonA(uint8_t * ptr, boolean state) {
-	const uint8_t ButtonIndex = 3;
-	const uint8_t ButtonPosition = 4;
-
+void setButton(uint8_t index, uint8_t position, uint8_t state) {
 	if (state == true) {
-		ptr[ButtonIndex] |= (1 << ButtonPosition);
+		txData[index] |= (1 << position);
 	}
 	else {
-		ptr[ButtonIndex] &= ~(1 << ButtonPosition);
+		txData[index] &= ~(1 << position);
 	}
 }
 
+void setButtonA(boolean state) {
+	setButton(3, 4, state);
+}
+
+void setPlayerControl(uint8_t num) {
+	// Player 1: Dpad Up
+	// Player 2; Dpad Down
+	// Player 3: Dpad Left
+	// Player 4: Dpad Right
+	setButton(2, num - 1, true);
+}
+
 void receiveCallback() {
 	if (XInputUSB::available() > 0) {
-		XInputUSB::recv(rxData, sizeof(rxData));
+		const int success = XInputUSB::recv((uint8_t*) rxData, sizeof(rxData));
+
+		if (success > 0 && rxData[0] == 0x01) {  // LED Packet
+			uint8_t ledPattern = rxData[2];
+			if (ledPattern >= 2 && ledPattern <= 9) {  // Player # Pattern
+				playerNum = ((ledPattern - 2) % 4) + 1;  // Player # 1-4
+			}
+		}
 	}
 }