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diff --git a/wirish/include/wirish/HardwareSerial.h b/wirish/include/wirish/HardwareSerial.h
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+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+/**
+ * @file HardwareSerial.h
+ * @brief Wirish serial port interface.
+ */
+
+#ifndef _WIRISH_HARDWARESERIAL_H_
+#define _WIRISH_HARDWARESERIAL_H_
+
+#include <libmaple/libmaple_types.h>
+#include <libmaple/usart.h>
+
+#include <wirish/Print.h>
+
+/*
+ * IMPORTANT:
+ *
+ * This class documented "by hand" (i.e., not using Doxygen) in the
+ * leaflabs-docs/ repository.
+ *
+ * If you alter the public HardwareSerial interface, you MUST update
+ * the documentation accordingly.
+ */
+
+class HardwareSerial : public Print {
+public:
+    HardwareSerial(usart_dev *usart_device,
+                   uint8 tx_pin,
+                   uint8 rx_pin,
+                   uint32 clock_speed);
+
+    /* Set up/tear down */
+    void begin(uint32 baud);
+    void end(void);
+
+    /* I/O */
+    uint32 available(void);
+    uint8 read(void);
+    void flush(void);
+    virtual void write(unsigned char);
+    using Print::write;
+
+    /* Pin accessors */
+    int txPin(void) { return this->tx_pin; }
+    int rxPin(void) { return this->rx_pin; }
+private:
+    usart_dev *usart_device;
+    uint8 tx_pin;
+    uint8 rx_pin;
+    uint32 clock_speed;
+};
+
+extern HardwareSerial Serial1;
+extern HardwareSerial Serial2;
+extern HardwareSerial Serial3;
+#if defined(STM32_HIGH_DENSITY) && !defined(BOARD_maple_RET6)
+extern HardwareSerial Serial4;
+extern HardwareSerial Serial5;
+#endif
+
+#endif