initial USB serial thread integrated to BLE RX (#1651)

firmware/application/usb_serial_thread.cpp

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "usb_serial_thread.hpp"
+#include "buffer_exchange.hpp"
+
+// UsbSerialThread //////////////////////////////////////////////////////////
+
+UsbSerialThread::UsbSerialThread() {
+    create_thread();
+}
+
+UsbSerialThread::~UsbSerialThread() {
+    stop();
+}
+
+void UsbSerialThread::create_thread() {
+    thread = chThdCreateFromHeap(NULL, 1024, NORMALPRIO + 10, UsbSerialThread::static_fn, this);
+}
+
+void UsbSerialThread::stop() {
+    if (thread) {
+        chThdTerminate(thread);
+        chThdWait(thread);
+        thread = nullptr;
+    }
+}
+
+msg_t UsbSerialThread::static_fn(void* arg) {
+    auto obj = static_cast<UsbSerialThread*>(arg);
+    obj->run();
+    return 0;
+}
+
+void UsbSerialThread::run() {
+    while (!chThdShouldTerminate()) {
+        if (str_ready) {
+            str_ready = false;
+            chprintf((BaseSequentialStream*)&SUSBD1, serial_str.c_str());
+        }
+
+        chThdSleepMilliseconds(50);
+    }
+}