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drivers/UARTSerial.h
- Committer:
- kevman
- Date:
- 2018-11-28
- Revision:
- 0:38ceb79fef03
File content as of revision 0:38ceb79fef03:
/* mbed Microcontroller Library * Copyright (c) 2006-2017 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 MBED_UARTSERIAL_H #define MBED_UARTSERIAL_H #include "platform/platform.h" #if (DEVICE_SERIAL && DEVICE_INTERRUPTIN) || defined(DOXYGEN_ONLY) #include "platform/FileHandle.h" #include "SerialBase.h" #include "InterruptIn.h" #include "platform/PlatformMutex.h" #include "hal/serial_api.h" #include "platform/CircularBuffer.h" #include "platform/NonCopyable.h" #ifndef MBED_CONF_DRIVERS_UART_SERIAL_RXBUF_SIZE #define MBED_CONF_DRIVERS_UART_SERIAL_RXBUF_SIZE 256 #endif #ifndef MBED_CONF_DRIVERS_UART_SERIAL_TXBUF_SIZE #define MBED_CONF_DRIVERS_UART_SERIAL_TXBUF_SIZE 256 #endif namespace mbed { /** \addtogroup drivers */ /** Class providing buffered UART communication functionality using separate circular buffer for send and receive channels * * @ingroup drivers */ class UARTSerial : private SerialBase, public FileHandle, private NonCopyable<UARTSerial> { public: /** Create a UARTSerial port, connected to the specified transmit and receive pins, with a particular baud rate. * @param tx Transmit pin * @param rx Receive pin * @param baud The baud rate of the serial port (optional, defaults to MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE) */ UARTSerial(PinName tx, PinName rx, int baud = MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE); virtual ~UARTSerial(); /** Equivalent to POSIX poll(). Derived from FileHandle. * Provides a mechanism to multiplex input/output over a set of file handles. */ virtual short poll(short events) const; /* Resolve ambiguities versus our private SerialBase * (for writable, spelling differs, but just in case) */ using FileHandle::readable; using FileHandle::writable; /** Write the contents of a buffer to a file * * Follows POSIX semantics: * * * if blocking, block until all data is written * * if no data can be written, and non-blocking set, return -EAGAIN * * if some data can be written, and non-blocking set, write partial * * @param buffer The buffer to write from * @param length The number of bytes to write * @return The number of bytes written, negative error on failure */ virtual ssize_t write(const void *buffer, size_t length); /** Read the contents of a file into a buffer * * Follows POSIX semantics: * * * if no data is available, and non-blocking set return -EAGAIN * * if no data is available, and blocking set, wait until data is available * * If any data is available, call returns immediately * * @param buffer The buffer to read in to * @param length The number of bytes to read * @return The number of bytes read, 0 at end of file, negative error on failure */ virtual ssize_t read(void *buffer, size_t length); /** Close a file * * @return 0 on success, negative error code on failure */ virtual int close(); /** Check if the file in an interactive terminal device * * @return True if the file is a terminal * @return False if the file is not a terminal * @return Negative error code on failure */ virtual int isatty(); /** Move the file position to a given offset from from a given location * * Not valid for a device type FileHandle like UARTSerial. * In case of UARTSerial, returns ESPIPE * * @param offset The offset from whence to move to * @param whence The start of where to seek * SEEK_SET to start from beginning of file, * SEEK_CUR to start from current position in file, * SEEK_END to start from end of file * @return The new offset of the file, negative error code on failure */ virtual off_t seek(off_t offset, int whence); /** Flush any buffers associated with the file * * @return 0 on success, negative error code on failure */ virtual int sync(); /** Set blocking or non-blocking mode * The default is blocking. * * @param blocking true for blocking mode, false for non-blocking mode. */ virtual int set_blocking(bool blocking) { _blocking = blocking; return 0; } /** Check current blocking or non-blocking mode for file operations. * * @return true for blocking mode, false for non-blocking mode. */ virtual bool is_blocking() const { return _blocking; } /** Register a callback on state change of the file. * * The specified callback will be called on state changes such as when * the file can be written to or read from. * * The callback may be called in an interrupt context and should not * perform expensive operations. * * Note! This is not intended as an attach-like asynchronous api, but rather * as a building block for constructing such functionality. * * The exact timing of when the registered function * is called is not guaranteed and susceptible to change. It should be used * as a cue to make read/write/poll calls to find the current state. * * @param func Function to call on state change */ virtual void sigio(Callback<void()> func); /** Setup interrupt handler for DCD line * * If DCD line is connected, an IRQ handler will be setup. * Does nothing if DCD is NC, i.e., not connected. * * @param dcd_pin Pin-name for DCD * @param active_high a boolean set to true if DCD polarity is active low */ void set_data_carrier_detect(PinName dcd_pin, bool active_high = false); /** Set the baud rate * * @param baud The baud rate */ void set_baud(int baud); // Expose private SerialBase::Parity as UARTSerial::Parity using SerialBase::Parity; // In C++11, we wouldn't need to also have using directives for each value using SerialBase::None; using SerialBase::Odd; using SerialBase::Even; using SerialBase::Forced1; using SerialBase::Forced0; /** 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 (None, Odd, Even, Forced1, Forced0; default = None) * @param stop_bits The number of stop bits (1 or 2; default = 1) */ void set_format(int bits = 8, Parity parity = UARTSerial::None, int stop_bits = 1); #if DEVICE_SERIAL_FC // For now use the base enum - but in future we may have extra options // such as XON/XOFF or manual GPIO RTSCTS. using SerialBase::Flow; // In C++11, we wouldn't need to also have using directives for each value using SerialBase::Disabled; using SerialBase::RTS; using SerialBase::CTS; using SerialBase::RTSCTS; /** 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); #endif private: void wait_ms(uint32_t millisec); /** SerialBase lock override */ virtual void lock(void); /** SerialBase unlock override */ virtual void unlock(void); /** Acquire mutex */ virtual void api_lock(void); /** Release mutex */ virtual void api_unlock(void); /** Software serial buffers * By default buffer size is 256 for TX and 256 for RX. Configurable through mbed_app.json */ CircularBuffer<char, MBED_CONF_DRIVERS_UART_SERIAL_RXBUF_SIZE> _rxbuf; CircularBuffer<char, MBED_CONF_DRIVERS_UART_SERIAL_TXBUF_SIZE> _txbuf; PlatformMutex _mutex; Callback<void()> _sigio_cb; bool _blocking; bool _tx_irq_enabled; bool _rx_irq_enabled; InterruptIn *_dcd_irq; /** Device Hanged up * Determines if the device hanged up on us. * * @return True, if hanged up */ bool hup() const; /** ISRs for serial * Routines to handle interrupts on serial pins. * Copies data into Circular Buffer. * Reports the state change to File handle. */ void tx_irq(void); void rx_irq(void); void wake(void); void dcd_irq(void); }; } //namespace mbed #endif //(DEVICE_SERIAL && DEVICE_INTERRUPTIN) || defined(DOXYGEN_ONLY) #endif //MBED_UARTSERIAL_H