Frederick Huang / mbed-STM32L452

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Dependents:   STM32L452_Nucleo_ticker

Fork of mbed-dev by mbed official

drivers/UARTSerial.h@178:79309dc6340a, 2017-11-23 (annotated)

Committer:
AnnaBridge
Date:
Thu Nov 23 11:57:25 2017 +0000
Revision:
178:79309dc6340a
Parent:
176:447f873cad2f 
mbed-dev library. Release version 156

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 167:e84263d55307 1 /* mbed Microcontroller Library
AnnaBridge 167:e84263d55307 2 * Copyright (c) 2006-2017 ARM Limited
AnnaBridge 167:e84263d55307 3 *
AnnaBridge 167:e84263d55307 4 * Licensed under the Apache License, Version 2.0 (the "License");
AnnaBridge 167:e84263d55307 5 * you may not use this file except in compliance with the License.
AnnaBridge 167:e84263d55307 6 * You may obtain a copy of the License at
AnnaBridge 167:e84263d55307 7 *
AnnaBridge 167:e84263d55307 8 * http://www.apache.org/licenses/LICENSE-2.0
AnnaBridge 167:e84263d55307 9 *
AnnaBridge 167:e84263d55307 10 * Unless required by applicable law or agreed to in writing, software
AnnaBridge 167:e84263d55307 11 * distributed under the License is distributed on an "AS IS" BASIS,
AnnaBridge 167:e84263d55307 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AnnaBridge 167:e84263d55307 13 * See the License for the specific language governing permissions and
AnnaBridge 167:e84263d55307 14 * limitations under the License.
AnnaBridge 167:e84263d55307 15 */
AnnaBridge 167:e84263d55307 16
AnnaBridge 167:e84263d55307 17 #ifndef MBED_UARTSERIAL_H
AnnaBridge 167:e84263d55307 18 #define MBED_UARTSERIAL_H
AnnaBridge 167:e84263d55307 19
AnnaBridge 167:e84263d55307 20 #include "platform/platform.h"
AnnaBridge 167:e84263d55307 21
AnnaBridge 168:9672193075cf 22 #if (DEVICE_SERIAL && DEVICE_INTERRUPTIN) || defined(DOXYGEN_ONLY)
AnnaBridge 167:e84263d55307 23
AnnaBridge 167:e84263d55307 24 #include "FileHandle.h"
AnnaBridge 167:e84263d55307 25 #include "SerialBase.h"
AnnaBridge 167:e84263d55307 26 #include "InterruptIn.h"
AnnaBridge 167:e84263d55307 27 #include "PlatformMutex.h"
AnnaBridge 167:e84263d55307 28 #include "serial_api.h"
AnnaBridge 167:e84263d55307 29 #include "CircularBuffer.h"
AnnaBridge 168:9672193075cf 30 #include "platform/NonCopyable.h"
AnnaBridge 167:e84263d55307 31
AnnaBridge 167:e84263d55307 32 #ifndef MBED_CONF_DRIVERS_UART_SERIAL_RXBUF_SIZE
AnnaBridge 167:e84263d55307 33 #define MBED_CONF_DRIVERS_UART_SERIAL_RXBUF_SIZE 256
AnnaBridge 167:e84263d55307 34 #endif
AnnaBridge 167:e84263d55307 35
AnnaBridge 167:e84263d55307 36 #ifndef MBED_CONF_DRIVERS_UART_SERIAL_TXBUF_SIZE
AnnaBridge 167:e84263d55307 37 #define MBED_CONF_DRIVERS_UART_SERIAL_TXBUF_SIZE 256
AnnaBridge 167:e84263d55307 38 #endif
AnnaBridge 167:e84263d55307 39
AnnaBridge 167:e84263d55307 40 namespace mbed {
AnnaBridge 167:e84263d55307 41
AnnaBridge 178:79309dc6340a 42 /** \addtogroup drivers */
AnnaBridge 178:79309dc6340a 43
AnnaBridge 178:79309dc6340a 44 /** Class providing buffered UART communication functionality using separate circular buffer for send and receive channels
AnnaBridge 178:79309dc6340a 45 *
AnnaBridge 178:79309dc6340a 46 * @ingroup drivers
AnnaBridge 178:79309dc6340a 47 */
AnnaBridge 178:79309dc6340a 48
AnnaBridge 168:9672193075cf 49 class UARTSerial : private SerialBase, public FileHandle, private NonCopyable<UARTSerial> {
AnnaBridge 167:e84263d55307 50
AnnaBridge 167:e84263d55307 51 public:
AnnaBridge 167:e84263d55307 52
AnnaBridge 167:e84263d55307 53 /** Create a UARTSerial port, connected to the specified transmit and receive pins, with a particular baud rate.
AnnaBridge 167:e84263d55307 54 * @param tx Transmit pin
AnnaBridge 167:e84263d55307 55 * @param rx Receive pin
AnnaBridge 167:e84263d55307 56 * @param baud The baud rate of the serial port (optional, defaults to MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE)
AnnaBridge 167:e84263d55307 57 */
AnnaBridge 167:e84263d55307 58 UARTSerial(PinName tx, PinName rx, int baud = MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE);
AnnaBridge 167:e84263d55307 59 virtual ~UARTSerial();
AnnaBridge 167:e84263d55307 60
AnnaBridge 167:e84263d55307 61 /** Equivalent to POSIX poll(). Derived from FileHandle.
AnnaBridge 167:e84263d55307 62 * Provides a mechanism to multiplex input/output over a set of file handles.
AnnaBridge 167:e84263d55307 63 */
AnnaBridge 167:e84263d55307 64 virtual short poll(short events) const;
AnnaBridge 167:e84263d55307 65
AnnaBridge 175:af195413fb11 66 /* Resolve ambiguities versus our private SerialBase
AnnaBridge 175:af195413fb11 67 * (for writable, spelling differs, but just in case)
AnnaBridge 175:af195413fb11 68 */
AnnaBridge 175:af195413fb11 69 using FileHandle::readable;
AnnaBridge 175:af195413fb11 70 using FileHandle::writable;
AnnaBridge 175:af195413fb11 71
AnnaBridge 167:e84263d55307 72 /** Write the contents of a buffer to a file
AnnaBridge 167:e84263d55307 73 *
AnnaBridge 167:e84263d55307 74 * @param buffer The buffer to write from
AnnaBridge 168:9672193075cf 75 * @param length The number of bytes to write
AnnaBridge 167:e84263d55307 76 * @return The number of bytes written, negative error on failure
AnnaBridge 167:e84263d55307 77 */
AnnaBridge 167:e84263d55307 78 virtual ssize_t write(const void* buffer, size_t length);
AnnaBridge 167:e84263d55307 79
AnnaBridge 167:e84263d55307 80 /** Read the contents of a file into a buffer
AnnaBridge 167:e84263d55307 81 *
AnnaBridge 167:e84263d55307 82 * Follows POSIX semantics:
AnnaBridge 167:e84263d55307 83 *
AnnaBridge 167:e84263d55307 84 * * if no data is available, and non-blocking set return -EAGAIN
AnnaBridge 167:e84263d55307 85 * * if no data is available, and blocking set, wait until data is available
AnnaBridge 167:e84263d55307 86 * * If any data is available, call returns immediately
AnnaBridge 167:e84263d55307 87 *
AnnaBridge 167:e84263d55307 88 * @param buffer The buffer to read in to
AnnaBridge 168:9672193075cf 89 * @param length The number of bytes to read
AnnaBridge 167:e84263d55307 90 * @return The number of bytes read, 0 at end of file, negative error on failure
AnnaBridge 167:e84263d55307 91 */
AnnaBridge 167:e84263d55307 92 virtual ssize_t read(void* buffer, size_t length);
AnnaBridge 167:e84263d55307 93
AnnaBridge 167:e84263d55307 94 /** Close a file
AnnaBridge 167:e84263d55307 95 *
AnnaBridge 167:e84263d55307 96 * @return 0 on success, negative error code on failure
AnnaBridge 167:e84263d55307 97 */
AnnaBridge 167:e84263d55307 98 virtual int close();
AnnaBridge 167:e84263d55307 99
AnnaBridge 167:e84263d55307 100 /** Check if the file in an interactive terminal device
AnnaBridge 167:e84263d55307 101 *
AnnaBridge 167:e84263d55307 102 * @return True if the file is a terminal
AnnaBridge 167:e84263d55307 103 * @return False if the file is not a terminal
AnnaBridge 167:e84263d55307 104 * @return Negative error code on failure
AnnaBridge 167:e84263d55307 105 */
AnnaBridge 167:e84263d55307 106 virtual int isatty();
AnnaBridge 167:e84263d55307 107
AnnaBridge 167:e84263d55307 108 /** Move the file position to a given offset from from a given location
AnnaBridge 167:e84263d55307 109 *
AnnaBridge 167:e84263d55307 110 * Not valid for a device type FileHandle like UARTSerial.
AnnaBridge 167:e84263d55307 111 * In case of UARTSerial, returns ESPIPE
AnnaBridge 167:e84263d55307 112 *
AnnaBridge 167:e84263d55307 113 * @param offset The offset from whence to move to
AnnaBridge 167:e84263d55307 114 * @param whence The start of where to seek
AnnaBridge 167:e84263d55307 115 * SEEK_SET to start from beginning of file,
AnnaBridge 167:e84263d55307 116 * SEEK_CUR to start from current position in file,
AnnaBridge 167:e84263d55307 117 * SEEK_END to start from end of file
AnnaBridge 167:e84263d55307 118 * @return The new offset of the file, negative error code on failure
AnnaBridge 167:e84263d55307 119 */
AnnaBridge 167:e84263d55307 120 virtual off_t seek(off_t offset, int whence);
AnnaBridge 167:e84263d55307 121
AnnaBridge 167:e84263d55307 122 /** Flush any buffers associated with the file
AnnaBridge 167:e84263d55307 123 *
AnnaBridge 167:e84263d55307 124 * @return 0 on success, negative error code on failure
AnnaBridge 167:e84263d55307 125 */
AnnaBridge 167:e84263d55307 126 virtual int sync();
AnnaBridge 167:e84263d55307 127
AnnaBridge 167:e84263d55307 128 /** Set blocking or non-blocking mode
AnnaBridge 167:e84263d55307 129 * The default is blocking.
AnnaBridge 167:e84263d55307 130 *
AnnaBridge 167:e84263d55307 131 * @param blocking true for blocking mode, false for non-blocking mode.
AnnaBridge 167:e84263d55307 132 */
AnnaBridge 167:e84263d55307 133 virtual int set_blocking(bool blocking)
AnnaBridge 167:e84263d55307 134 {
AnnaBridge 167:e84263d55307 135 _blocking = blocking;
AnnaBridge 167:e84263d55307 136 return 0;
AnnaBridge 167:e84263d55307 137 }
AnnaBridge 167:e84263d55307 138
AnnaBridge 167:e84263d55307 139 /** Register a callback on state change of the file.
AnnaBridge 167:e84263d55307 140 *
AnnaBridge 167:e84263d55307 141 * The specified callback will be called on state changes such as when
AnnaBridge 167:e84263d55307 142 * the file can be written to or read from.
AnnaBridge 167:e84263d55307 143 *
AnnaBridge 167:e84263d55307 144 * The callback may be called in an interrupt context and should not
AnnaBridge 167:e84263d55307 145 * perform expensive operations.
AnnaBridge 167:e84263d55307 146 *
AnnaBridge 167:e84263d55307 147 * Note! This is not intended as an attach-like asynchronous api, but rather
AnnaBridge 167:e84263d55307 148 * as a building block for constructing such functionality.
AnnaBridge 167:e84263d55307 149 *
AnnaBridge 167:e84263d55307 150 * The exact timing of when the registered function
AnnaBridge 167:e84263d55307 151 * is called is not guaranteed and susceptible to change. It should be used
AnnaBridge 167:e84263d55307 152 * as a cue to make read/write/poll calls to find the current state.
AnnaBridge 167:e84263d55307 153 *
AnnaBridge 167:e84263d55307 154 * @param func Function to call on state change
AnnaBridge 167:e84263d55307 155 */
AnnaBridge 167:e84263d55307 156 virtual void sigio(Callback<void()> func);
AnnaBridge 167:e84263d55307 157
AnnaBridge 167:e84263d55307 158 /** Setup interrupt handler for DCD line
AnnaBridge 167:e84263d55307 159 *
AnnaBridge 167:e84263d55307 160 * If DCD line is connected, an IRQ handler will be setup.
AnnaBridge 167:e84263d55307 161 * Does nothing if DCD is NC, i.e., not connected.
AnnaBridge 167:e84263d55307 162 *
AnnaBridge 167:e84263d55307 163 * @param dcd_pin Pin-name for DCD
AnnaBridge 167:e84263d55307 164 * @param active_high a boolean set to true if DCD polarity is active low
AnnaBridge 167:e84263d55307 165 */
AnnaBridge 167:e84263d55307 166 void set_data_carrier_detect(PinName dcd_pin, bool active_high = false);
AnnaBridge 167:e84263d55307 167
Kojto 170:19eb464bc2be 168 /** Set the baud rate
Kojto 170:19eb464bc2be 169 *
Kojto 170:19eb464bc2be 170 * @param baud The baud rate
Kojto 170:19eb464bc2be 171 */
Kojto 170:19eb464bc2be 172 void set_baud(int baud);
Kojto 170:19eb464bc2be 173
AnnaBridge 167:e84263d55307 174 private:
AnnaBridge 167:e84263d55307 175
AnnaBridge 176:447f873cad2f 176 void wait_ms(uint32_t millisec);
AnnaBridge 176:447f873cad2f 177
AnnaBridge 168:9672193075cf 178 /** SerialBase lock override */
AnnaBridge 168:9672193075cf 179 virtual void lock(void);
AnnaBridge 168:9672193075cf 180
AnnaBridge 168:9672193075cf 181 /** SerialBase unlock override */
AnnaBridge 168:9672193075cf 182 virtual void unlock(void);
AnnaBridge 168:9672193075cf 183
AnnaBridge 168:9672193075cf 184 /** Acquire mutex */
AnnaBridge 168:9672193075cf 185 virtual void api_lock(void);
AnnaBridge 168:9672193075cf 186
AnnaBridge 168:9672193075cf 187 /** Release mutex */
AnnaBridge 168:9672193075cf 188 virtual void api_unlock(void);
AnnaBridge 168:9672193075cf 189
AnnaBridge 167:e84263d55307 190 /** Software serial buffers
AnnaBridge 167:e84263d55307 191 * By default buffer size is 256 for TX and 256 for RX. Configurable through mbed_app.json
AnnaBridge 167:e84263d55307 192 */
AnnaBridge 167:e84263d55307 193 CircularBuffer<char, MBED_CONF_DRIVERS_UART_SERIAL_RXBUF_SIZE> _rxbuf;
AnnaBridge 167:e84263d55307 194 CircularBuffer<char, MBED_CONF_DRIVERS_UART_SERIAL_TXBUF_SIZE> _txbuf;
AnnaBridge 167:e84263d55307 195
AnnaBridge 167:e84263d55307 196 PlatformMutex _mutex;
AnnaBridge 167:e84263d55307 197
AnnaBridge 167:e84263d55307 198 Callback<void()> _sigio_cb;
AnnaBridge 167:e84263d55307 199
AnnaBridge 167:e84263d55307 200 bool _blocking;
AnnaBridge 167:e84263d55307 201 bool _tx_irq_enabled;
AnnaBridge 167:e84263d55307 202 InterruptIn *_dcd_irq;
AnnaBridge 167:e84263d55307 203
AnnaBridge 167:e84263d55307 204 /** Device Hanged up
AnnaBridge 167:e84263d55307 205 * Determines if the device hanged up on us.
AnnaBridge 167:e84263d55307 206 *
AnnaBridge 167:e84263d55307 207 * @return True, if hanged up
AnnaBridge 167:e84263d55307 208 */
AnnaBridge 167:e84263d55307 209 bool hup() const;
AnnaBridge 167:e84263d55307 210
AnnaBridge 167:e84263d55307 211 /** ISRs for serial
AnnaBridge 167:e84263d55307 212 * Routines to handle interrupts on serial pins.
AnnaBridge 167:e84263d55307 213 * Copies data into Circular Buffer.
AnnaBridge 167:e84263d55307 214 * Reports the state change to File handle.
AnnaBridge 167:e84263d55307 215 */
AnnaBridge 167:e84263d55307 216 void tx_irq(void);
AnnaBridge 167:e84263d55307 217 void rx_irq(void);
AnnaBridge 167:e84263d55307 218
AnnaBridge 167:e84263d55307 219 void wake(void);
AnnaBridge 167:e84263d55307 220
AnnaBridge 167:e84263d55307 221 void dcd_irq(void);
AnnaBridge 168:9672193075cf 222
AnnaBridge 167:e84263d55307 223 };
AnnaBridge 167:e84263d55307 224 } //namespace mbed
AnnaBridge 167:e84263d55307 225
AnnaBridge 168:9672193075cf 226 #endif //(DEVICE_SERIAL && DEVICE_INTERRUPTIN) || defined(DOXYGEN_ONLY)
AnnaBridge 167:e84263d55307 227 #endif //MBED_UARTSERIAL_H