Mbed OS Reference | SerialBase.h Source File

 /* mbed Microcontroller Library
  * Copyright (c) 2006-2013 ARM Limited
  * 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 MBED_SERIALBASE_H
 #define MBED_SERIALBASE_H
 
 #include "platform/platform.h"
 
 #if DEVICE_SERIAL || defined(DOXYGEN_ONLY)
 
 #include "platform/Callback.h"
 #include "hal/serial_api.h"
 #include "platform/mbed_toolchain.h"
 #include "platform/NonCopyable.h"
 
 #if DEVICE_SERIAL_ASYNCH
 #include "platform/CThunk.h"
 #include "hal/dma_api.h"
 #endif
 
 namespace mbed {
 /**
  * \defgroup drivers_SerialBase SerialBase class
  * \ingroup drivers-public-api-uart
  * @{
  */
 
 /** A base class for serial port implementations
  * Can't be instantiated directly (use UnbufferedSerial or BufferedSerial)
  *
  * @note Synchronization level: Set by subclass
  */
 class SerialBase : private NonCopyable<SerialBase> {
 
 public:
     /** Set the baud rate of the serial port
      *
      *  @param baudrate The baudrate of the serial port (default = 9600).
      */
     void baud(int baudrate);
 
     enum Parity {
         None = 0,
         Odd,
         Even,
         Forced1,
         Forced0
     };
 
     enum IrqType {
         RxIrq = 0,
         TxIrq,
 
         IrqCnt
     };
 
     enum Flow {
         Disabled = 0,
         RTS,
         CTS,
         RTSCTS
     };
 
     /** Set the transmission format used by the serial port
      *
      *  @param bits The number of bits in a word (5-8; default = 8)
      *  @param parity The parity used (SerialBase::None, SerialBase::Odd, SerialBase::Even, SerialBase::Forced1, SerialBase::Forced0; default = SerialBase::None)
      *  @param stop_bits The number of stop bits (1 or 2; default = 1)
      */
     void format(int bits = 8, Parity parity = SerialBase::None, int stop_bits = 1);
 
     /** Determine if there is a character available to read
      *
      *  @returns
      *    1 if there is a character available to read,
      *    0 otherwise
      */
     int readable();
 
     /** Determine if there is space available to write a character
      *
      *  @returns
      *    1 if there is space to write a character,
      *    0 otherwise
      */
     int writeable();
 
     /** Attach a function to call whenever a serial interrupt is generated
      *
      *  @param func A pointer to a void function, or 0 to set as none
      *  @param type Which serial interrupt to attach the member function to (Serial::RxIrq for receive, TxIrq for transmit buffer empty)
      */
     void attach(Callback<void()> func, IrqType type = RxIrq);
 
     /** Generate a break condition on the serial line
      *  NOTE: Clear break needs to run at least one frame after set_break is called
      */
     void set_break();
 
     /** Clear a break condition on the serial line
      *  NOTE: Should be run at least one frame after set_break is called
      */
     void clear_break();
 
     /** Generate a break condition on the serial line
      */
     void send_break();
 
     /** Enable serial input
      *
      * If both serial input and serial output are disabled, the
      * peripheral is freed. If either serial input or serial
      * output is re-enabled, the peripheral is reinitialized.
      *
      * On re-initialization rx interrupts will be enabled if a
      * rx handler is attached. The rx handler is called once
      * during re-initialization.
      */
     void enable_input(bool enable = true);
 
     /** Enable serial output
      *
      * If both serial input and serial output are disabled, the
      * peripheral is freed. If either serial input or serial
      * output is re-enabled, the peripheral is reinitialized.
      *
      * On re-initialization tx interrupts will be enabled if a
      * tx handler is attached. The tx handler is called once
      * during re-initialization.
      */
     void enable_output(bool enable = true);
 
 #if !defined(DOXYGEN_ONLY)
 protected:
 
     /** Acquire exclusive access to this serial port
      */
     virtual void lock(void);
 
     /** Release exclusive access to this serial port
      */
     virtual void unlock(void);
 #endif
 public:
 
 #if DEVICE_SERIAL_FC
     /** Set the flow control type on the serial port
      *
      *  @param type the flow control type (Disabled, RTS, CTS, RTSCTS)
      *  @param flow1 the first flow control pin (RTS for RTS or RTSCTS, CTS for CTS)
      *  @param flow2 the second flow control pin (CTS for RTSCTS)
      */
     void set_flow_control(Flow type, PinName flow1 = NC, PinName flow2 = NC);
 
     /** Set the flow control type on the serial port
      *
      *  @param type the flow control type (Disabled, RTS, CTS, RTSCTS)
      *  @param pinmap reference to structure which holds static pinmap
      */
     void set_flow_control(Flow type, const serial_fc_pinmap_t &static_pinmap);
 #endif
 
     static void _irq_handler(uint32_t id, SerialIrq irq_type);
 
 #if DEVICE_SERIAL_ASYNCH
 
     /** Begin asynchronous write using 8bit buffer.
      *
      *  The write operation ends with any of the enabled events and invokes
      *  registered callback function (which can be empty to not receive callback at all).
      *  Events that are not enabled by event argument are simply ignored.
      *  Operation has to be ended explicitly by calling abort_write() when
      *  no events are enabled.
      *  This function locks the deep sleep until any event has occurred.
      *
      *  @param buffer   The buffer where received data will be stored
      *  @param length   The buffer length in bytes
      *  @param callback The event callback function
      *  @param event    The logical OR of TX events that should end operation
      *  @return Zero if new transaction was started, -1 if transaction is already on-going
      */
     int write(const uint8_t *buffer, int length, const event_callback_t &callback, int event = SERIAL_EVENT_TX_COMPLETE);
 
     /** Begin asynchronous write using 16bit buffer.
      *
      *  The write operation ends with any of the enabled events and invokes
      *  registered callback function (which can be empty to not receive callback at all).
      *  Events that are not enabled by event argument are simply ignored.
      *  Operation has to be ended explicitly by calling abort_write() when
      *  no events are enabled.
      *  This function locks the deep sleep until any event has occurred.
      *
      *  @param buffer   The buffer where received data will be stored
      *  @param length   The buffer length in bytes
      *  @param callback The event callback function
      *  @param event    The logical OR of TX events that should end operation
      *  @return Zero if new transaction was started, -1 if transaction is already on-going
      */
     int write(const uint16_t *buffer, int length, const event_callback_t &callback, int event = SERIAL_EVENT_TX_COMPLETE);
 
     /** Abort the on-going write transfer
      *
      *  It is safe to call abort_write() when there is no on-going transaction.
      */
     void abort_write();
 
     /** Begin asynchronous reading using 8bit buffer.
      *
      *  The read operation ends with any of the enabled events and invokes registered
      *  callback function (which can be empty to not receive callback at all).
      *  Events that are not enabled by event argument are simply ignored.
      *  Operation has to be ended explicitly by calling abort_read() when
      *  no events are enabled.
      *  This function locks the deep sleep until any event has occurred.
      *
      *  @param buffer     The buffer where received data will be stored
      *  @param length     The buffer length in bytes
      *  @param callback   The event callback function
      *  @param event      The logical OR of RX events that should end operation
      *  @param char_match The matching character
      *  @return Zero if new transaction was started, -1 if transaction is already on-going
      */
     int read(uint8_t *buffer, int length, const event_callback_t &callback, int event = SERIAL_EVENT_RX_COMPLETE, unsigned char char_match = SERIAL_RESERVED_CHAR_MATCH);
 
     /** Begin asynchronous reading using 16bit buffer.
      *
      *  The read operation ends with any of the enabled events and invokes registered
      *  callback function (which can be empty to not receive callback at all).
      *  Events that are not enabled by event argument are simply ignored.
      *  Operation has to be ended explicitly by calling abort_read() when
      *  no events are enabled.
      *  This function locks the deep sleep until any event has occurred.
      *
      *  @param buffer     The buffer where received data will be stored
      *  @param length     The buffer length in bytes
      *  @param callback   The event callback function
      *  @param event      The logical OR of RX events that should end operation
      *  @param char_match The matching character
      *  @return Zero if new transaction was started, -1 if transaction is already on-going
      */
     int read(uint16_t *buffer, int length, const event_callback_t &callback, int event = SERIAL_EVENT_RX_COMPLETE, unsigned char char_match = SERIAL_RESERVED_CHAR_MATCH);
 
     /** Abort the on-going read transfer
      *
      *  It is safe to call abort_read() when there is no on-going transaction.
      */
     void abort_read();
 
     /** Configure DMA usage suggestion for non-blocking TX transfers
      *
      *  @param usage The usage DMA hint for peripheral
      *  @return Zero if the usage was set, -1 if a transaction is on-going
      */
     int set_dma_usage_tx(DMAUsage usage);
 
     /** Configure DMA usage suggestion for non-blocking RX transfers
      *
      *  @param usage The usage DMA hint for peripheral
      *  @return Zero if the usage was set, -1 if a transaction is on-going
      */
     int set_dma_usage_rx(DMAUsage usage);
 
 #if !defined(DOXYGEN_ONLY)
 protected:
     void start_read(void *buffer, int buffer_size, char buffer_width, const event_callback_t &callback, int event, unsigned char char_match);
     void start_write(const void *buffer, int buffer_size, char buffer_width, const event_callback_t &callback, int event);
     void interrupt_handler_asynch(void);
 #endif
 #endif
 
 #if !defined(DOXYGEN_ONLY)
 protected:
     SerialBase(PinName tx, PinName rx, int baud);
     SerialBase(const serial_pinmap_t &static_pinmap, int baud);
     virtual ~SerialBase();
 
     int _base_getc();
 
     int _base_putc(int c);
 
     /** Initialize serial port
      */
     void _init();
     void _init_direct();
     /* Pointer to serial init function */
     void (SerialBase::*_init_func)();
 
     /** Deinitialize serial port
      */
     void _deinit();
 
 #if DEVICE_SERIAL_ASYNCH
     CThunk<SerialBase> _thunk_irq;
     DMAUsage _tx_usage = DMA_USAGE_NEVER;
     DMAUsage _rx_usage = DMA_USAGE_NEVER;
     event_callback_t _tx_callback;
     event_callback_t _rx_callback;
     bool _tx_asynch_set = false;
     bool _rx_asynch_set = false;
 #endif
 
     serial_t              _serial {};
     Callback<void()>      _irq[IrqCnt];
     int                   _baud;
     bool                  _rx_enabled = true;
     bool                  _tx_enabled = true;
     const PinName         _tx_pin;
     const PinName         _rx_pin;
     const serial_pinmap_t *_static_pinmap = NULL;
     void (SerialBase::*_set_flow_control_dp_func)(Flow, PinName, PinName) = NULL;
 
 #if DEVICE_SERIAL_FC
     Flow                           _flow_type = Disabled;
     PinName                        _flow1 = NC;
     PinName                        _flow2 = NC;
     const serial_fc_pinmap_t       *_static_pinmap_fc = NULL;
     void (SerialBase::*_set_flow_control_sp_func)(Flow, const serial_fc_pinmap_t &) = NULL;
 #endif
 
 #endif
 };
 
 /** @}*/
 
 } // namespace mbed
 
 #endif
 
 #endif
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