Mbed OS Reference | USBCDC.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 USBCDC_H
 #define USBCDC_H
 
 /* These headers are included for child class. */
 #include "USBDescriptor.h"
 #include "USBDevice_Types.h"
 
 #include "USBDevice.h"
 #include "OperationList.h"
 
 class AsyncOp;
 
 class USBCDC: 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
     */
     USBCDC(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
     * @param product_id Your product_id
     * @param product_release Your product_release
     */
     USBCDC(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 ~USBCDC();
 
     /**
      * Check if this class is ready
      *
      * @return true if a terminal is connected, false otherwise
      */
     bool ready();
 
     /**
      * Block until the terminal is connected
      */
     void wait_ready();
 
     /*
     * Send a buffer
     *
     * This function blocks until the full contents have been sent.
     *
     * @param buffer buffer to be sent
     * @param size length of the buffer
     * @returns true if successful false if interrupted due to a state change
     */
     bool send(uint8_t *buffer, uint32_t size);
 
     /**
      * Send what there is room for
      *
      * @param buffer data to send
      * @param size maximum number of bytes to send
      * @param actual a pointer to where to store the number of bytes sent
      * @param now true to start data transmission, false to wait
      */
     void send_nb(uint8_t *buffer, uint32_t size, uint32_t *actual, bool now = true);
 
     /*
     * Read a buffer from a certain endpoint. Warning: blocking
     *
     * Blocks until at least one byte of data has been read (actual != NULL) or
     * until the full size has been read (actual == NULL).
     *
     * @param buffer buffer where will be stored bytes
     * @param size the maximum number of bytes to read
     * @param actual A pointer to where to store the number of bytes actually read
     *   or NULL to read the full size
     * @returns true if successful false if interrupted due to a state change
     */
     bool receive(uint8_t *buffer, uint32_t size, uint32_t *actual = NULL);
 
     /**
      * Read from the receive buffer
      *
      * @param buffer buffer to fill with data
      * @param size maximum number of bytes read
      * @param actual a pointer to where to store the number of bytes actually received
      */
     void receive_nb(uint8_t *buffer, uint32_t size, uint32_t *actual);
 
 protected:
     /*
     * Get device descriptor. Warning: this method has to store the length of the report descriptor in reportLength.
     *
     * @returns pointer to the device descriptor
     */
     virtual const uint8_t *device_desc();
 
     /*
     * Get string product descriptor
     *
     * @returns pointer to the string product descriptor
     */
     virtual const uint8_t *string_iproduct_desc();
 
     /*
     * Get string interface descriptor
     *
     * @returns pointer to the string interface descriptor
     */
     virtual const uint8_t *string_iinterface_desc();
 
     /*
     * Get configuration descriptor
     *
     * @param index descriptor index
     * @returns pointer to the configuration descriptor
     */
     virtual const uint8_t *configuration_desc(uint8_t index);
 
     /*
     * Called by USBCallback_requestCompleted when CDC line coding is changed
     * Warning: Called in ISR
     *
     * @param baud The baud rate
     * @param bits The number of bits in a word (5-8)
     * @param parity The parity
     * @param stop The number of stop bits (1 or 2)
     */
     virtual void line_coding_changed(int baud, int bits, int parity, int stop) {};
 
     /*
      * Called when there is data that can be read
      */
     virtual void data_rx() {}
 
     /*
      * Called when there is space in the TX buffer
      */
     virtual void data_tx() {}
 
 protected:
 
     class AsyncWrite;
     class AsyncRead;
     class AsyncWait;
 
     virtual void callback_reset();
     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);
 
     void _init();
 
     void _change_terminal_connected(bool connected);
 
     void _send_isr_start();
     void _send_isr();
 
     void _receive_isr_start();
     void _receive_isr();
 
     usb_ep_t _bulk_in;
     usb_ep_t _bulk_out;
     usb_ep_t _int_in;
 
     uint8_t _cdc_line_coding[7];
     uint8_t _cdc_new_line_coding[7];
     uint8_t _config_descriptor[75];
 
     OperationList<AsyncWait> _connected_list;
     bool _terminal_connected;
 
     OperationList<AsyncWrite> _tx_list;
     bool _tx_in_progress;
     uint8_t _tx_buffer[64];
     uint8_t *_tx_buf;
     uint32_t _tx_size;
 
     OperationList<AsyncRead> _rx_list;
     bool _rx_in_progress;
     uint8_t _rx_buffer[64];
     uint8_t *_rx_buf;
     uint32_t _rx_size;
 };
 
 #endif
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