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Diffstat (limited to 'ext/SerialBase.h')
| -rw-r--r-- | ext/SerialBase.h | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/ext/SerialBase.h b/ext/SerialBase.h new file mode 100644 index 0000000..51aeb33 --- /dev/null +++ b/ext/SerialBase.h @@ -0,0 +1,223 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2013 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_SERIALBASE_H +#define MBED_SERIALBASE_H + +#include "platform.h" + +#if DEVICE_SERIAL + +#include "Stream.h" +#include "FunctionPointer.h" +#include "serial_api.h" + +#if DEVICE_SERIAL_ASYNCH +#include "CThunk.h" +#include "dma_api.h" +#endif + +namespace mbed { + +/** A base class for serial port implementations + * Can't be instantiated directly (use Serial or RawSerial) + */ +class 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 + }; + + 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 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 fptr A pointer to a void function, or 0 to set as none + * @param type Which serial interrupt to attach the member function to (Seriall::RxIrq for receive, TxIrq for transmit buffer empty) + */ + void attach(void (*fptr)(void), IrqType type=RxIrq); + + /** Attach a member function to call whenever a serial interrupt is generated + * + * @param tptr pointer to the object to call the member function on + * @param mptr pointer to the member function to be called + * @param type Which serial interrupt to attach the member function to (Seriall::RxIrq for receive, TxIrq for transmit buffer empty) + */ + template<typename T> + void attach(T* tptr, void (T::*mptr)(void), IrqType type=RxIrq) { + if((mptr != NULL) && (tptr != NULL)) { + _irq[type].attach(tptr, mptr); + serial_irq_set(&_serial, (SerialIrq)type, 1); + } else { + serial_irq_set(&_serial, (SerialIrq)type, 0); + } + } + + /** Generate a break condition on the serial line + */ + void send_break(); + +#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); +#endif + + static void _irq_handler(uint32_t id, SerialIrq irq_type); + +#if DEVICE_SERIAL_ASYNCH + + /** Begin asynchronous write using 8bit buffer. The completition invokes registered TX event callback + * + * @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 + */ + 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 completition invokes registered TX event callback + * + * @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 + */ + 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 + */ + void abort_write(); + + /** Begin asynchronous reading using 8bit buffer. The completition invokes registred RX event callback. + * + * @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 + * @param char_match The matching character + */ + 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 completition invokes registred RX event callback. + * + * @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 + * @param char_match The matching character + */ + 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 + */ + 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); + +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 + +protected: + SerialBase(PinName tx, PinName rx); + virtual ~SerialBase() { + } + + int _base_getc(); + int _base_putc(int c); + +#if DEVICE_SERIAL_ASYNCH + CThunk<SerialBase> _thunk_irq; + event_callback_t _tx_callback; + event_callback_t _rx_callback; + DMAUsage _tx_usage; + DMAUsage _rx_usage; +#endif + + serial_t _serial; + FunctionPointer _irq[2]; + int _baud; + +}; + +} // namespace mbed + +#endif + +#endif |