mbed-os/libraries/USBHost/USBHostSerial/USBHostSerial.h

/* mbed USBHost Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * 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 USBHOSTSERIAL_H
#define USBHOSTSERIAL_H

#include "USBHostConf.h"

#if USBHOST_SERIAL

#include "USBHost.h"
#include "Stream.h"
#include "MtxCircBuffer.h"

/** 
 * A class to communicate a USB virtual serial port
 */
class USBHostSerial : public IUSBEnumerator, public Stream {
public:
    /**
    * Constructor
    */
    USBHostSerial();

    enum IrqType {
        RxIrq,
        TxIrq
    };
    
    enum Parity {
        None = 0,
        Odd,
        Even,
        Mark,
        Space
    };

    /**
    * Check if a virtual serial port is connected
    *
    * @returns true if a serial device is connected
    */
    bool connected();
    
    /**
     * Try to connect a serial device
     *
     * @return true if connection was successful
     */
    bool connect();
    
    /**
    * Check the number of bytes available.
    *
    * @returns the number of bytes available
    */
    uint8_t available(); 

    /**
     *  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
     *  @param irq irq type
     */
    template<typename T>
    inline void attach(T* tptr, void (T::*mptr)(void), IrqType irq = RxIrq) {
        if ((mptr != NULL) && (tptr != NULL)) {
            if (irq == RxIrq) {
                rx.attach(tptr, mptr);
            } else {
                tx.attach(tptr, mptr);
            }
        }
    }

    /**
     * Attach a callback called when a packet is received
     *
     * @param ptr function pointer
     */
    inline void attach(void (*fn)(void), IrqType irq = RxIrq) {
        if (fn != NULL) {
            if (irq == RxIrq) {
                rx.attach(fn);
            } else {
                tx.attach(fn);
            }
        }
    }
    
    /** Set the baud rate of the serial port
     *
     *  @param baudrate The baudrate of the serial port (default = 9600).
     */
    void baud(int baudrate = 9600);
    
    /** Set the transmission format used by the Serial port
     *
     *  @param bits The number of bits in a word (default = 8)
     *  @param parity The parity used (USBHostSerial::None, USBHostSerial::Odd, USBHostSerial::Even, USBHostSerial::Mark, USBHostSerial::Space; default = USBHostSerial::None)
     *  @param stop The number of stop bits (1 or 2; default = 1)
     */
    void format(int bits = 8, Parity parity = USBHostSerial::None, int stop_bits = 1);


protected:
    //From IUSBEnumerator
    virtual void setVidPid(uint16_t vid, uint16_t pid);
    virtual bool parseInterface(uint8_t intf_nb, uint8_t intf_class, uint8_t intf_subclass, uint8_t intf_protocol); //Must return true if the interface should be parsed
    virtual bool useEndpoint(uint8_t intf_nb, ENDPOINT_TYPE type, ENDPOINT_DIRECTION dir); //Must return true if the endpoint will be used

    virtual int _getc();
    virtual int _putc(int c);
    
private:
    USBHost * host;
    USBDeviceConnected * dev;
    USBEndpoint * bulk_in;
    USBEndpoint * bulk_out;
    uint32_t size_bulk_in;
    uint32_t size_bulk_out;

    bool dev_connected;

    void init();

    MtxCircBuffer<uint8_t, 64> circ_buf;

    uint8_t buf[64];

    typedef struct {
        uint32_t baudrate;
        uint8_t stop_bits;
        uint8_t parity;
        uint8_t data_bits;
    } PACKED LINE_CODING;
    
    LINE_CODING line_coding;

    void rxHandler();
    void txHandler();
    FunctionPointer rx;
    FunctionPointer tx;

    int serial_intf;
    bool serial_device_found;

};

#endif

#endif