feat: adds pairing key

tmk_core/common/webusb.c

@@ -0,0 +1,24 @@
+#include "webusb.h"
+#include "wait.h"
+
+webusb_state_t webusb_state = {
+  .paired = false,
+  .pairing = false,
+};
+
+void webusb_set_pairing_state() {
+    webusb_state.pairing = true;
+    uint8_t tick = 0;
+    do {
+        tick++;
+        wait_ms(1000);
+        //TODO Blink some leds
+    } while(webusb_state.paired == false && tick <= 30);
+    webusb_state.pairing = false;
+}
+
+void webusb_error(uint8_t code) {
+    uint8_t buffer[1];
+    buffer[0] = code;
+    webusb_send(buffer, 1);
+}

tmk_core/common/webusb.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+void webusb_receive(uint8_t *data, uint8_t length);
+void webusb_send(uint8_t *data, uint8_t length);
+void webusb_error(uint8_t);
+void webusb_set_pairing_state(void);
+
+typedef struct{
+    bool paired;
+    bool pairing;
+} webusb_state_t;
+
+extern webusb_state_t webusb_state;
+
+enum Webusb_Status_Code {
+    WEBUSB_STATUS_NOT_PAIRED = -1,
+    WEBUSB_STATUS_OK,
+    WEBUSB_STATUS_UNKNOWN_COMMAND,
+};
+
+