simulator: add USB serial input field

watch-library/hardware/watch/watch.c

@@ -41,3 +41,7 @@ void SYSTEM_Handler(void) {
 bool watch_is_buzzer_or_led_enabled(void){
     return hri_mclk_get_APBCMASK_TCC0_bit(MCLK);
 }
+
+bool watch_is_usb_enabled(void) {
+    return USB->DEVICE.CTRLA.bit.ENABLE;
+}

watch-library/shared/watch/watch.h

@@ -76,6 +76,10 @@
   */
 bool watch_is_buzzer_or_led_enabled(void);
 
+/** @brief Returns true if USB is enabled.
+  */
+bool watch_is_usb_enabled(void);
+
 /** @brief Reads up to len bytes from the USB serial.
   * @param file ignored, you can pass in 0
   * @param ptr pointer to a buffer of at least len bytes

watch-library/simulator/shell.html

@@ -323,6 +323,9 @@
 
 <button onclick="getLocation()">Set location register (will prompt for access)</button>
 <br>
+<input id="input" style="width: 500px"></input>
+<button id="submit" onclick="sendText()">Send</button>
+<br>
 <textarea id="output" rows="8" style="width: 100%"></textarea>
 
 <script type='text/javascript'>
@@ -365,10 +368,16 @@
   };
   lat = 0;
   lon = 0;
+  tx = "";
   function updateLocation(location) {
     lat = Math.round(location.coords.latitude * 100);
     lon = Math.round(location.coords.longitude * 100);
   }
+  function sendText() {
+    var inputElement = document.getElementById('input');
+    tx = inputElement.value + "\n";
+    inputElement.value = "";
+  }
   function showError(error) {
     switch(error.code) {
       case error.PERMISSION_DENIED:

watch-library/simulator/watch/watch.c

@@ -3,3 +3,7 @@
 bool watch_is_buzzer_or_led_enabled(void) {
     return false;
 }
+
+bool watch_is_usb_enabled(void) {
+    return true;
+}