Mbed OS Reference | USBMIDI.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 USBMIDI_H
 #define USBMIDI_H
 
 /* These headers are included for child class. */
 #include "USBDescriptor.h"
 #include "USBDevice_Types.h"
 
 #include "USBDevice.h"
 #include "MIDIMessage.h"
 #include "EventFlags.h"
 #include "Mutex.h"
 #include "Callback.h"
 
 #define DEFAULT_CONFIGURATION (1)
 
 /**
  * \defgroup drivers_USBMIDI USBMIDI class
  * \ingroup drivers-public-api-usb
  * @{
  */
 
 /**
 * USBMIDI example
 *
 * @code
 * #include "mbed.h"
 * #include "USBMIDI.h"
 *
 * USBMIDI midi;
 *
 * int main() {
 *    while (1) {
 *        for(int i=48; i<83; i++) {     // send some messages!
 *            midi.write(MIDIMessage::NoteOn(i));
 *            ThisThread::sleep_for(250);
 *            midi.write(MIDIMessage::NoteOff(i));
 *            ThisThread::sleep_for(500);
 *        }
 *    }
 * }
 * @endcode
 */
 class USBMIDI: public USBDevice {
 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
     * @param product_id Your product_id
     * @param product_release Your product_release
     */
     USBMIDI(bool connect_blocking = true, uint16_t vendor_id = 0x0700, uint16_t product_id = 0x0101, 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
     * @param product_id Your product_id
     * @param product_release Your product_release
     */
     USBMIDI(USBPhy *phy, uint16_t vendor_id, uint16_t product_id, uint16_t product_release);
 
     /**
      * Destroy this object
      *
      * Any classes which inherit from this class must call deinit
      * before this destructor runs.
      */
     virtual ~USBMIDI();
 
     /**
      * Check if this class is ready
      *
      * @return true if configured, false otherwise
      */
     bool ready();
 
     /**
      * Block until this device is configured
      */
     void wait_ready();
 
     /**
      * Send a MIDIMessage
      *
      * @param m The MIDIMessage to send
      * @return true if the message was sent, false otherwise
      */
     bool write(MIDIMessage m);
 
     /**
      * Check if a message can be read
      *
      * @return true if a packet can be read false otherwise
      * @note USBMIDI::attach must be called to enable the receiver
      */
     bool readable();
 
     /**
      * Read a message
      *
      * @param m The MIDIMessage to fill
      * @return true if a message was read, false otherwise
      */
     bool read(MIDIMessage *m);
 
     /**
      * Attach a callback for when a MIDIEvent is received
      *
      * @param callback code to call when a packet is received
      */
     void attach(mbed::Callback<void()> callback);
 
 
 protected:
 
     virtual void callback_state_change(DeviceState new_state);
 
     virtual void callback_request(const setup_packet_t *setup);
 
     virtual void callback_request_xfer_done(const setup_packet_t *setup, bool aborted);
 
     virtual void callback_set_configuration(uint8_t configuration);
 
     virtual void callback_set_interface(uint16_t interface, uint8_t alternate);
 
     virtual const uint8_t *string_iproduct_desc();
 
     virtual const uint8_t *string_iinterface_desc();
 
     virtual const uint8_t *configuration_desc(uint8_t index);
 
 private:
     static const uint32_t MaxSize = 64;
 
     uint8_t _bulk_buf[MaxSize];
     uint32_t _bulk_buf_pos;
     uint32_t _bulk_buf_size;
 
     bool _data_ready;
     uint8_t _data[MAX_MIDI_MESSAGE_SIZE + 1];
     uint32_t _cur_data;
 
     rtos::EventFlags _flags;
     rtos::Mutex _write_mutex;
 
     usb_ep_t _bulk_in;
     usb_ep_t _bulk_out;
     uint8_t _config_descriptor[0x65];
 
     mbed::Callback<void()> _callback;
 
     void _init();
     void _in_callback();
     void _out_callback();
     bool _next_message();
 };
 
 /** @}*/
 
 #endif
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