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mbed-os/drivers/SerialBase.h

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/* 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 Serial or RawSerial)
*
* @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);
/** Attach a member function to call whenever a serial interrupt is generated
*
* @param obj pointer to the object to call the member function on
* @param method pointer to the member function to be called
* @param type Which serial interrupt to attach the member function to (Serial::RxIrq for receive, TxIrq for transmit buffer empty)
* @deprecated
* The attach function does not support cv-qualifiers. Replaced by
* attach(callback(obj, method), type).
*/
template<typename T>
MBED_DEPRECATED_SINCE("mbed-os-5.1",
"The attach function does not support cv-qualifiers. Replaced by "
"attach(callback(obj, method), type).")
void attach(T *obj, void (T::*method)(), IrqType type = RxIrq)
{
attach(callback(obj, method), type);
}
/** Attach a member function to call whenever a serial interrupt is generated
*
* @param obj pointer to the object to call the member function on
* @param method pointer to the member function to be called
* @param type Which serial interrupt to attach the member function to (Serial::RxIrq for receive, TxIrq for transmit buffer empty)
* @deprecated
* The attach function does not support cv-qualifiers. Replaced by
* attach(callback(obj, method), type).
*/
template<typename T>
MBED_DEPRECATED_SINCE("mbed-os-5.1",
"The attach function does not support cv-qualifiers. Replaced by "
"attach(callback(obj, method), type).")
void attach(T *obj, void (*method)(T *), IrqType type = RxIrq)
{
attach(callback(obj, method), type);
}
/** 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);
#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 NULL 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 NULL 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 NULL 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 NULL 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);
virtual ~SerialBase();
int _base_getc();
int _base_putc(int c);
/** Initialize serial port
*/
void _init();
/** Deinitialize serial port
*/
void _deinit();
#if DEVICE_SERIAL_ASYNCH
CThunk<SerialBase> _thunk_irq;
DMAUsage _tx_usage;
DMAUsage _rx_usage;
event_callback_t _tx_callback;
event_callback_t _rx_callback;
bool _tx_asynch_set;
bool _rx_asynch_set;
#endif
serial_t _serial;
Callback<void()> _irq[IrqCnt];
int _baud;
bool _rx_enabled;
bool _tx_enabled;
const PinName _tx_pin;
const PinName _rx_pin;
#if DEVICE_SERIAL_FC
Flow _flow_type;
PinName _flow1;
PinName _flow2;
#endif
#endif
};
/** @}*/
} // namespace mbed
#endif
#endif
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