USBSerial.h

00001 /* Copyright (c) 2010-2011 mbed.org, MIT License
00002 *
00003 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00004 * and associated documentation files (the "Software"), to deal in the Software without
00005 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
00006 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
00007 * Software is furnished to do so, subject to the following conditions:
00008 *
00009 * The above copyright notice and this permission notice shall be included in all copies or
00010 * substantial portions of the Software.
00011 *
00012 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00013 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00014 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00015 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00016 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00017 */
00018 
00019 #ifndef USBSERIAL_H
00020 #define USBSERIAL_H
00021 
00022 #include "USBCDC.h"
00023 #include "Stream.h"
00024 #include "CircBuffer.h"
00025 
00026 
00027 /**
00028 * USBSerial example
00029 *
00030 * @code
00031 * #include "mbed.h"
00032 * #include "USBSerial.h"
00033 *
00034 * //Virtual serial port over USB
00035 * USBSerial serial;
00036 *
00037 * int main(void) {
00038 *
00039 *    while(1)
00040 *    {
00041 *        serial.printf("I am a virtual serial port\n");
00042 *        wait(1);
00043 *    }
00044 * }
00045 * @endcode
00046 */
00047 class USBSerial: public USBCDC, public Stream {
00048 public:
00049 
00050     /**
00051     *   Constructor
00052     *
00053     * @param vendor_id Your vendor_id (default: 0x1f00)
00054     * @param product_id Your product_id (default: 0x2012)
00055     * @param product_release Your preoduct_release (default: 0x0001)
00056     * @param connect_blocking define if the connection must be blocked if USB not plugged in
00057     *
00058     */
00059     USBSerial(uint16_t vendor_id = 0x1f00, uint16_t product_id = 0x2012, uint16_t product_release = 0x0001, bool connect_blocking = true): USBCDC(vendor_id, product_id, product_release, connect_blocking), buf(128){
00060         settingsChangedCallback = 0;
00061     };
00062 
00063 
00064     /**
00065     * Send a character. You can use puts, printf.
00066     *
00067     * @param c character to be sent
00068     * @returns true if there is no error, false otherwise
00069     */
00070     virtual int _putc(int c);
00071     
00072     /**
00073     * Read a character: blocking
00074     *
00075     * @returns character read
00076     */
00077     virtual int _getc();
00078     
00079     /**
00080     * Check the number of bytes available.
00081     *
00082     * @returns the number of bytes available
00083     */
00084     uint8_t available(); 
00085 
00086     /** Determine if there is a character available to read
00087      *
00088      *  @returns
00089      *    1 if there is a character available to read,
00090      *    0 otherwise
00091      */
00092     int readable() { return available() ? 1 : 0; }
00093     
00094     /** Determine if there is space available to write a character
00095      *
00096      *  @returns
00097      *    1 if there is space to write a character,
00098      *    0 otherwise
00099      */
00100     int writeable() { return 1; } // always return 1, for write operation is blocking
00101     
00102     /**
00103     * Write a block of data. 
00104     *
00105     * For more efficiency, a block of size 64 (maximum size of a bulk endpoint) has to be written.
00106     *
00107     * @param buf pointer on data which will be written
00108     * @param size size of the buffer. The maximum size of a block is limited by the size of the endpoint (64 bytes)
00109     *
00110     * @returns true if successfull
00111     */
00112     bool writeBlock(uint8_t * buf, uint16_t size);
00113 
00114     /**
00115      *  Attach a member function to call when a packet is received. 
00116      *
00117      *  @param tptr pointer to the object to call the member function on
00118      *  @param mptr pointer to the member function to be called
00119      */
00120     template<typename T>
00121     void attach(T* tptr, void (T::*mptr)(void)) {
00122         if((mptr != NULL) && (tptr != NULL)) {
00123             rx.attach(tptr, mptr);
00124         }
00125     }
00126 
00127     /**
00128      * Attach a callback called when a packet is received
00129      *
00130      * @param fptr function pointer
00131      */
00132     void attach(void (*fptr)(void)) {
00133         if(fptr != NULL) {
00134             rx.attach(fptr);
00135         }
00136     }
00137 
00138     /**
00139      * Attach a callback to call when serial's settings are changed.
00140      *
00141      * @param fptr function pointer
00142      */
00143     void attach(void (*fptr)(int baud, int bits, int parity, int stop)) {
00144         settingsChangedCallback = fptr;
00145     }
00146 
00147 protected:
00148     virtual bool EP2_OUT_callback();
00149     virtual void lineCodingChanged(int baud, int bits, int parity, int stop){
00150         if (settingsChangedCallback) {
00151             settingsChangedCallback(baud, bits, parity, stop);
00152         }
00153     }
00154 
00155 private:
00156     FunctionPointer rx;
00157     CircBuffer<uint8_t> buf;
00158     void (*settingsChangedCallback)(int baud, int bits, int parity, int stop);
00159 };
00160 
00161 #endif