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mbed-classic/api/SerialBase.h

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/* 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