suppress HID messages when device is disconnected

.gitignore

@@ -1,2 +1,2 @@
-/build/**/*
-/external/**/*
+/*/**/*
+!/html/**/*

README.md

@@ -20,6 +20,8 @@ You will need the following hardware to make the device:
 - light dependent resistor such as GL5528 (specific part number may vary)
 - 10k ohm resistor (resistance value may vary)
 
+![Wiring schematic](schematic.svg)
+
 You will need to cut the USB extension in half and connect the wires from the
 female end to the Raspberry Pi Pico (2). The default configuration is to attach
 the USB's green wire to pin 1/GP0 and USB's white wire to pin 2/GP1. You will

aw410k.c

@@ -376,12 +376,17 @@ void startADC() {
 
 // forward HID report after processing
 bool forward_report(uint8_t instance, uint8_t const* report, uint16_t len) {
-	// toggle mute button color if mute button is pressed
-	if ( instance == 0x02 && report[0] == 0x02 && (report[2] & 0x01) ) {
-		mute = !mute;
+	// forward only if device is connected
+	if (device_state == DEVICE_ACTIVE) {
+		// toggle mute button color if mute button is pressed
+		if ( instance == 0x02 && report[0] == 0x02 && (report[2] & 0x01) ) {
+			mute = !mute;
+		}
+
+		return tud_hid_n_report(instance, 0, report, len);
 	}
 
-	return tud_hid_n_report(instance, 0, report, len);
+	return true;
 }
 
 // save RGB configuration to flash

usb_device.c

@@ -79,19 +79,17 @@ void usb_device_main(void) {
 	while (true) {
 		switch ( device_state ) {
 			case DEVICE_ACTIVE:
+				if (!tud_mounted()) {
+					device_state = DEVICE_INACTIVE;
+				}
 				break;
 			case DEVICE_INACTIVE:
 				break;
 			case DEVICE_RESTART:
 				if (tud_disconnect()) {
+					device_state = DEVICE_INACTIVE;
 					sleep_ms(10);
-					if (tud_connect()) {
-						if ( host_state == HOST_INACTIVE ) {
-							device_state = DEVICE_INACTIVE;
-						} else {
-							device_state = DEVICE_ACTIVE;
-						}
-					}
+					tud_connect();
 				}
 				break;
 			default:
@@ -243,6 +241,11 @@ uint16_t tud_hid_get_report_cb(uint8_t instance, uint8_t report_id, hid_report_t
 	return 0;
 }
 
+// Invoked when device is mounted
+void tud_mount_cb(void) {
+	device_state = DEVICE_ACTIVE;
+}
+
 // print message to CDC in raw hex
 void cdc_print_hex(uint8_t const* msg, uint16_t msg_len) {
 	(void) msg;