Mbed OS Reference | USBSerial.h Source File

 /*
  * Copyright (c) 2018-2019, Arm Limited and affiliates.
  * SPDX-License-Identifier: Apache-2.0
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 #ifndef USBSERIAL_H
 #define USBSERIAL_H
 
 #include "USBCDC.h"
 #include "Stream.h"
 #include "Callback.h"
 
 /**
 * USBSerial example
 *
 * @code
 * #include "mbed.h"
 * #include "USBSerial.h"
 *
 * //Virtual serial port over USB
 * USBSerial serial;
 *
 * int main(void) {
 *
 *    while(1)
 *    {
 *        serial.printf("I am a virtual serial port\n");
 *        wait(1);
 *    }
 * }
 * @endcode
 */
 class USBSerial: public USBCDC, public mbed::Stream {
 public:
 
     /**
     * Basic constructor
     *
     * Construct this object optionally connecting and blocking until it is ready.
     *
     * @note Do not use this constructor in derived classes.
     *
     * @param connect_blocking true to perform a blocking connect, false to start in a disconnected state
     * @param vendor_id Your vendor_id (default: 0x1f00)
     * @param product_id Your product_id (default: 0x2012)
     * @param product_release Your product_release (default: 0x0001)
     *
     */
     USBSerial(bool connect_blocking = true, uint16_t vendor_id = 0x1f00, uint16_t product_id = 0x2012, uint16_t product_release = 0x0001);
 
     /**
     * Fully featured constructor
     *
     * Construct this object with the supplied USBPhy and parameters. The user
     * this object is responsible for calling connect() or init().
     *
     * @note Derived classes must use this constructor and call init() or
     * connect() themselves. Derived classes should also call deinit() in
     * their destructor. This ensures that no interrupts can occur when the
     * object is partially constructed or destroyed.
     *
     * @param phy USB phy to use
     * @param vendor_id Your vendor_id (default: 0x1f00)
     * @param product_id Your product_id (default: 0x2012)
     * @param product_release Your product_release (default: 0x0001)
     *
     */
     USBSerial(USBPhy *phy, uint16_t vendor_id = 0x1f00, uint16_t product_id = 0x2012, uint16_t product_release = 0x0001);
 
     /**
      * Destroy this object
      *
      * Any classes which inherit from this class must call deinit
      * before this destructor runs.
      */
     virtual ~USBSerial();
 
     /**
     * Send a character. You can use puts, printf.
     *
     * @param c character to be sent
     * @returns true if there is no error, false otherwise
     */
     virtual int _putc(int c);
 
     /**
     * Read a character: blocking
     *
     * @returns character read
     */
     virtual int _getc();
 
     /**
     * Check the number of bytes available.
     *
     * @returns the number of bytes available
     */
     uint8_t available();
 
     /**
     * Check if the terminal is connected.
     *
     * @returns connection status
     */
     bool connected();
 
     /** Determine if there is a character available to read
      *
      *  @returns
      *    1 if there is a character available to read,
      *    0 otherwise
      */
     int readable()
     {
         return available() ? 1 : 0;
     }
 
     /** Determine if there is space available to write a character
      *
      *  @returns
      *    1 if there is space to write a character,
      *    0 otherwise
      */
     int writeable()
     {
         return 1;    // always return 1, for write operation is blocking
     }
 
     /**
      *  Attach a member function to call when a packet is received.
      *
      *  @param tptr pointer to the object to call the member function on
      *  @param mptr pointer to the member function to be called
      */
     template<typename T>
     void attach(T *tptr, void (T::*mptr)(void))
     {
         USBCDC::lock();
 
         if ((mptr != NULL) && (tptr != NULL)) {
             rx = mbed::Callback<void()>(mptr, tptr);
         }
 
         USBCDC::unlock();
     }
 
     /**
      * Attach a callback called when a packet is received
      *
      * @param fptr function pointer
      */
     void attach(void (*fptr)(void))
     {
         USBCDC::lock();
 
         if (fptr != NULL) {
             rx = mbed::Callback<void()>(fptr);
         }
 
         USBCDC::unlock();
     }
 
     /**
      * Attach a Callback called when a packet is received
      *
      * @param cb Callback to attach
      */
     void attach(mbed::Callback<void()> &cb)
     {
         USBCDC::lock();
 
         rx = cb;
 
         USBCDC::unlock();
     }
 
     /**
      * Attach a callback to call when serial's settings are changed.
      *
      * @param fptr function pointer
      */
     void attach(void (*fptr)(int baud, int bits, int parity, int stop))
     {
         USBCDC::lock();
 
         _settings_changed_callback = fptr;
 
         USBCDC::unlock();
     }
 
 protected:
     virtual void data_rx();
     virtual void line_coding_changed(int baud, int bits, int parity, int stop)
     {
         assert_locked();
 
         if (_settings_changed_callback) {
             _settings_changed_callback(baud, bits, parity, stop);
         }
     }
 
 private:
     mbed::Callback<void()> rx;
     void (*_settings_changed_callback)(int baud, int bits, int parity, int stop);
 };
 
 #endif
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