simmel-bootloader/lib/sdk/components/libraries/hci/hci_transport.h

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/**
* Copyright (c) 2013 - 2017, Nordic Semiconductor ASA
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form, except as embedded into a Nordic
* Semiconductor ASA integrated circuit in a product or a software update for
* such product, must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* 4. This software, with or without modification, must only be used with a
* Nordic Semiconductor ASA integrated circuit.
*
* 5. Any software provided in binary form under this license must not be reverse
* engineered, decompiled, modified and/or disassembled.
*
* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/**@file
*
* @defgroup hci_transport HCI Transport
* @{
* @ingroup app_common
*
* @brief HCI transport module implementation.
*
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* This module implements certain specific features from the three-wire UART transport layer,
* defined by the Bluetooth specification version 4.0 [Vol 4] part D.
*
* \par Features supported
* - Transmission and reception of Vendor Specific HCI packet type application packets.
* - Transmission and reception of reliable packets: defined by chapter 6 of the specification.
*
* \par Features not supported
* - Link establishment procedure: defined by chapter 8 of the specification.
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* - Low power: defined by chapter 9 of the specification.
*
* \par Implementation specific behaviour
* - As Link establishment procedure is not supported following static link configuration parameters
* are used:
* + TX window size is 1.
* + 16 bit CCITT-CRC must be used.
* + Out of frame software flow control not supported.
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* + Parameters specific for resending reliable packets are compile time configurable (clarifed
* later in this document).
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* + Acknowledgement packet transmissions are not timeout driven , meaning they are delivered for
* transmission within same context which the corresponding application packet was received.
*
* \par Implementation specific limitations
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* Current implementation has the following limitations which will have impact to system wide
* behaviour:
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* - Delayed acknowledgement scheduling not implemented:
* There exists a possibility that acknowledgement TX packet and application TX packet will collide
* in the TX pipeline having the end result that acknowledgement packet will be excluded from the TX
* pipeline which will trigger the retransmission algorithm within the peer protocol entity.
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* - Delayed retransmission scheduling not implemented:
* There exists a possibility that retransmitted application TX packet and acknowledgement TX packet
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* will collide in the TX pipeline having the end result that retransmitted application TX packet
* will be excluded from the TX pipeline.
* - Processing of the acknowledgement number from RX application packets:
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* Acknowledgement number is not processed from the RX application packets having the end result
* that unnecessary application packet retransmissions can occur.
*
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* The application TX packet processing flow is illustrated by the statemachine below.
*
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* @image html hci_transport_tx_sm.svg "TX - application packet statemachine"
*
* \par Component specific configuration options
*
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* The following compile time configuration options are available, and used to configure the
* application TX packet retransmission interval, in order to suite various application specific
* implementations:
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* - MAC_PACKET_SIZE_IN_BITS Maximum size of a single application packet in bits.
* - USED_BAUD_RATE Used uart baudrate.
*
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* The following compile time configuration option is available to configure module specific
* behaviour:
* - MAX_RETRY_COUNT Max retransmission retry count for applicaton packets.
*/
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#ifndef HCI_TRANSPORT_H__
#define HCI_TRANSPORT_H__
#include <stdint.h>
#include "nrf_error.h"
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#ifdef __cplusplus
extern "C" {
#endif
/**@brief Generic event callback function events. */
typedef enum
{
HCI_TRANSPORT_RX_RDY, /**< An event indicating that RX packet is ready for read. */
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HCI_TRANSPORT_EVT_TYPE_MAX /**< Enumeration upper bound. */
} hci_transport_evt_type_t;
/**@brief Struct containing events from the Transport layer.
*/
typedef struct
{
hci_transport_evt_type_t evt_type; /**< Type of event. */
} hci_transport_evt_t;
/**@brief Transport layer generic event callback function type.
*
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* @param[in] event Transport layer event.
*/
typedef void (*hci_transport_event_handler_t)(hci_transport_evt_t event);
/**@brief TX done event callback function result codes. */
typedef enum
{
HCI_TRANSPORT_TX_DONE_SUCCESS, /**< Transmission success, peer transport entity has acknowledged the transmission. */
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HCI_TRANSPORT_TX_DONE_FAILURE /**< Transmission failure. */
} hci_transport_tx_done_result_t;
/**@brief Transport layer TX done event callback function type.
*
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* @param[in] result TX done event result code.
*/
typedef void (*hci_transport_tx_done_handler_t)(hci_transport_tx_done_result_t result);
/**@brief Function for registering a generic event handler.
*
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* @note Multiple registration requests will overwrite any possible existing registration.
*
* @param[in] event_handler The function to be called by the transport layer upon an event.
*
* @retval NRF_SUCCESS Operation success.
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* @retval NRF_ERROR_NULL Operation failure. NULL pointer supplied.
*/
uint32_t hci_transport_evt_handler_reg(hci_transport_event_handler_t event_handler);
/**@brief Function for registering a handler for TX done event.
*
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* @note Multiple registration requests will overwrite any possible existing registration.
*
* @param[in] event_handler The function to be called by the transport layer upon TX done
* event.
*
* @retval NRF_SUCCESS Operation success.
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* @retval NRF_ERROR_NULL Operation failure. NULL pointer supplied.
*/
uint32_t hci_transport_tx_done_register(hci_transport_tx_done_handler_t event_handler);
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/**@brief Function for opening the transport channel and initializing the transport layer.
*
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* @warning Must not be called for a channel which has been allready opened.
*
* @retval NRF_SUCCESS Operation success.
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* @retval NRF_ERROR_INTERNAL Operation failure. Internal error ocurred.
*/
uint32_t hci_transport_open(void);
/**@brief Function for closing the transport channel.
*
* @note Can be called multiple times and also for not opened channel.
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*
* @retval NRF_SUCCESS Operation success.
*/
uint32_t hci_transport_close(void);
/**@brief Function for allocating tx packet memory.
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*
* @param[out] pp_memory Pointer to the packet data.
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*
* @retval NRF_SUCCESS Operation success. Memory was allocated.
* @retval NRF_ERROR_NO_MEM Operation failure. No memory available.
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* @retval NRF_ERROR_NULL Operation failure. NULL pointer supplied.
*/
uint32_t hci_transport_tx_alloc(uint8_t ** pp_memory);
/**@brief Function for freeing tx packet memory.
*
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* @note Memory management works in FIFO principle meaning that free order must match the alloc
* order.
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*
* @retval NRF_SUCCESS Operation success. Memory was freed.
*/
uint32_t hci_transport_tx_free(void);
/**@brief Function for writing a packet.
*
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* @note Completion of this method does not guarantee that actual peripheral transmission would
* have completed.
*
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* @note In case of 0 byte packet length write request, message will consist of only transport
* module specific headers.
*
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* @retval NRF_SUCCESS Operation success. Packet was added to the transmission queue
* and an event will be send upon transmission completion.
* @retval NRF_ERROR_NO_MEM Operation failure. Transmission queue is full and packet was not
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* added to the transmission queue. User should wait for
* a appropriate event prior issuing this operation again.
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* @retval NRF_ERROR_DATA_SIZE Operation failure. Packet size exceeds limit.
* @retval NRF_ERROR_NULL Operation failure. NULL pointer supplied.
* @retval NRF_ERROR_INVALID_STATE Operation failure. Channel is not open.
*/
uint32_t hci_transport_pkt_write(const uint8_t * p_buffer, uint16_t length);
/**@brief Function for extracting received packet.
*
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* @note Extracted memory can't be reused by the underlying transport layer untill freed by call to
* hci_transport_rx_pkt_consume().
*
* @param[out] pp_buffer Pointer to the packet data.
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* @param[out] p_length Length of packet data in bytes.
*
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* @retval NRF_SUCCESS Operation success. Packet was extracted.
* @retval NRF_ERROR_NO_MEM Operation failure. No packet available to extract.
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* @retval NRF_ERROR_NULL Operation failure. NULL pointer supplied.
*/
uint32_t hci_transport_rx_pkt_extract(uint8_t ** pp_buffer, uint16_t * p_length);
/**@brief Function for consuming extracted packet described by p_buffer.
*
* RX memory pointed to by p_buffer is freed and can be reused by the underlying transport layer.
*
* @param[in] p_buffer Pointer to the buffer that has been consumed.
*
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* @retval NRF_SUCCESS Operation success.
* @retval NRF_ERROR_NO_MEM Operation failure. No packet available to consume.
* @retval NRF_ERROR_INVALID_ADDR Operation failure. Not a valid pointer.
*/
uint32_t hci_transport_rx_pkt_consume(uint8_t * p_buffer);
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#ifdef __cplusplus
}
#endif
#endif // HCI_TRANSPORT_H__
/** @} */