tool/mbed/mbed-sdk/libraries/mbed/api/SerialBase.h

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2013 ARM Limited
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 #ifndef MBED_SERIALBASE_H
  17 #define MBED_SERIALBASE_H
  18
  19 #include "platform.h"
  20
  21 #if DEVICE_SERIAL
  22
  23 #include "Stream.h"
  24 #include "FunctionPointer.h"
  25 #include "serial_api.h"
  26
  27 namespace mbed {
  28
  29 /** A base class for serial port implementations
  30  * Can't be instantiated directly (use Serial or RawSerial)
  31  */
  32 class SerialBase {
  33
  34 public:
  35     /** Set the baud rate of the serial port
  36      *
  37      *  @param baudrate The baudrate of the serial port (default = 9600).
  38      */
  39     void baud(int baudrate);
  40
  41     enum Parity {
  42         None = 0,
  43         Odd,
  44         Even,
  45         Forced1,
  46         Forced0
  47     };
  48
  49     enum IrqType {
  50         RxIrq = 0,
  51         TxIrq
  52     };
  53
  54     enum Flow {
  55         Disabled = 0,
  56         RTS,
  57         CTS,
  58         RTSCTS
  59     };
  60
  61     /** Set the transmission format used by the serial port
  62      *
  63      *  @param bits The number of bits in a word (5-8; default = 8)
  64      *  @param parity The parity used (SerialBase::None, SerialBase::Odd, SerialBase::Even, SerialBase::Forced1, SerialBase::Forced0; default = SerialBase::None)
  65      *  @param stop The number of stop bits (1 or 2; default = 1)
  66      */
  67     void format(int bits=8, Parity parity=SerialBase::None, int stop_bits=1);
  68
  69     /** Determine if there is a character available to read
  70      *
  71      *  @returns
  72      *    1 if there is a character available to read,
  73      *    0 otherwise
  74      */
  75     int readable();
  76
  77     /** Determine if there is space available to write a character
  78      *
  79      *  @returns
  80      *    1 if there is space to write a character,
  81      *    0 otherwise
  82      */
  83     int writeable();
  84
  85     /** Attach a function to call whenever a serial interrupt is generated
  86      *
  87      *  @param fptr A pointer to a void function, or 0 to set as none
  88      *  @param type Which serial interrupt to attach the member function to (Seriall::RxIrq for receive, TxIrq for transmit buffer empty)
  89      */
  90     void attach(void (*fptr)(void), IrqType type=RxIrq);
  91
  92     /** Attach a member function to call whenever a serial interrupt is generated
  93      *
  94      *  @param tptr pointer to the object to call the member function on
  95      *  @param mptr pointer to the member function to be called
  96      *  @param type Which serial interrupt to attach the member function to (Seriall::RxIrq for receive, TxIrq for transmit buffer empty)
  97      */
  98     template<typename T>
  99     void attach(T* tptr, void (T::*mptr)(void), IrqType type=RxIrq) {
 100         if((mptr != NULL) && (tptr != NULL)) {
 101             _irq[type].attach(tptr, mptr);
 102             serial_irq_set(&_serial, (SerialIrq)type, 1);
 103         }
 104     }
 105
 106     /** Generate a break condition on the serial line
 107      */
 108     void send_break();
 109
 110 #if DEVICE_SERIAL_FC
 111     /** Set the flow control type on the serial port
 112      *
 113      *  @param type the flow control type (Disabled, RTS, CTS, RTSCTS)
 114      *  @param flow1 the first flow control pin (RTS for RTS or RTSCTS, CTS for CTS)
 115      *  @param flow2 the second flow control pin (CTS for RTSCTS)
 116      */
 117     void set_flow_control(Flow type, PinName flow1=NC, PinName flow2=NC);
 118 #endif
 119
 120     static void _irq_handler(uint32_t id, SerialIrq irq_type);
 121
 122 protected:
 123     SerialBase(PinName tx, PinName rx);
 124     virtual ~SerialBase() {
 125     }
 126
 127     int _base_getc();
 128     int _base_putc(int c);
 129
 130     serial_t        _serial;
 131     FunctionPointer _irq[2];
 132     int             _baud;
 133 };
 134
 135 } // namespace mbed
 136
 137 #endif
 138
 139 #endif