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hci_transport.h

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00001 /* Copyright (c) 2013 Nordic Semiconductor. All Rights Reserved.
00002  *
00003  * The information contained herein is property of Nordic Semiconductor ASA.
00004  * Terms and conditions of usage are described in detail in NORDIC
00005  * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
00006  *
00007  * Licensees are granted free, non-transferable use of the information. NO
00008  * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
00009  * the file.
00010  *
00011  */
00012  
00013 /**@file
00014  *
00015  * @defgroup hci_transport HCI Transport
00016  * @{
00017  * @ingroup  app_common
00018  *
00019  * @brief    HCI transport module implementation.
00020  *
00021  * This module implements certain specific features from the three-wire UART transport layer, 
00022  * defined by the Bluetooth specification version 4.0 [Vol 4] part D.
00023  *
00024  * \par Features supported
00025  * - Transmission and reception of Vendor Specific HCI packet type application packets.
00026  * - Transmission and reception of reliable packets: defined by chapter 6 of the specification.
00027  *
00028  * \par Features not supported
00029  * - Link establishment procedure: defined by chapter 8 of the specification.
00030  * - Low power: defined by chapter 9 of the specification. 
00031  *
00032  * \par Implementation specific behaviour
00033  * - As Link establishment procedure is not supported following static link configuration parameters
00034  * are used:
00035  * + TX window size is 1.
00036  * + 16 bit CCITT-CRC must be used.
00037  * + Out of frame software flow control not supported.
00038  * + Parameters specific for resending reliable packets are compile time configurable (clarifed 
00039  * later in this document).
00040  * + Acknowledgement packet transmissions are not timeout driven , meaning they are delivered for 
00041  * transmission within same context which the corresponding application packet was received. 
00042  *
00043  * \par Implementation specific limitations
00044  * Current implementation has the following limitations which will have impact to system wide 
00045  * behaviour:
00046  * - Delayed acknowledgement scheduling not implemented: 
00047  * There exists a possibility that acknowledgement TX packet and application TX packet will collide 
00048  * in the TX pipeline having the end result that acknowledgement packet will be excluded from the TX 
00049  * pipeline which will trigger the retransmission algorithm within the peer protocol entity.
00050  * - Delayed retransmission scheduling not implemented:  
00051  * There exists a possibility that retransmitted application TX packet and acknowledgement TX packet
00052  * will collide in the TX pipeline having the end result that retransmitted application TX packet 
00053  * will be excluded from the TX pipeline.
00054  * - Processing of the acknowledgement number from RX application packets:
00055  * Acknowledgement number is not processed from the RX application packets having the end result 
00056  * that unnecessary application packet retransmissions can occur.
00057  *
00058  * The application TX packet processing flow is illustrated by the statemachine below. 
00059  *
00060  * @image html hci_transport_tx_sm.png "TX - application packet statemachine"
00061  *
00062  * \par Component specific configuration options
00063  *
00064  * The following compile time configuration options are available, and used to configure the 
00065  * application TX packet retransmission interval, in order to suite various application specific 
00066  * implementations:
00067  * - MAC_PACKET_SIZE_IN_BITS Maximum size of a single application packet in bits. 
00068  * - USED_BAUD_RATE Used uart baudrate. 
00069  *
00070  * The following compile time configuration option is available to configure module specific 
00071  * behaviour:
00072  * - MAX_RETRY_COUNT Max retransmission retry count for applicaton packets.
00073  */
00074  
00075 #ifndef HCI_TRANSPORT_H__
00076 #define HCI_TRANSPORT_H__
00077 
00078 #include <stdint.h>
00079 #include "nordic_global.h"
00080 #include "nrf_error.h"
00081 
00082 /**@brief Generic event callback function events. */
00083 typedef enum
00084 {
00085     HCI_TRANSPORT_RX_RDY,               /**< An event indicating that RX packet is ready for read. */
00086     HCI_TRANSPORT_EVT_TYPE_MAX          /**< Enumeration upper bound. */  
00087 } hci_transport_evt_type_t;
00088 
00089 /**@brief Struct containing events from the Transport layer.
00090  */
00091 typedef struct
00092 {
00093     hci_transport_evt_type_t evt_type;  /**< Type of event. */
00094 } hci_transport_evt_t;
00095 
00096 /**@brief Transport layer generic event callback function type.
00097  *
00098  * @param[in] event                Transport layer event.  
00099  */
00100 typedef void (*hci_transport_event_handler_t)(hci_transport_evt_t event);
00101 
00102 /**@brief TX done event callback function result codes. */
00103 typedef enum
00104 {
00105     HCI_TRANSPORT_TX_DONE_SUCCESS,      /**< Transmission success, peer transport entity has acknowledged the transmission. */
00106     HCI_TRANSPORT_TX_DONE_FAILURE       /**< Transmission failure. */    
00107 } hci_transport_tx_done_result_t;
00108 
00109 /**@brief Transport layer TX done event callback function type.
00110  *
00111  * @param[in] result                TX done event result code. 
00112  */
00113 typedef void (*hci_transport_tx_done_handler_t)(hci_transport_tx_done_result_t result);
00114 
00115 /**@brief Function for registering a generic event handler.
00116  *
00117  * @note Multiple registration requests will overwrite any possible existing registration. 
00118  *
00119  * @param[in] event_handler         The function to be called by the transport layer upon an event.
00120  *
00121  * @retval NRF_SUCCESS              Operation success.
00122  * @retval NRF_ERROR_NULL           Operation failure. NULL pointer supplied.    
00123  */
00124 uint32_t hci_transport_evt_handler_reg(hci_transport_event_handler_t event_handler);
00125 
00126 /**@brief Function for registering a handler for TX done event.
00127  *
00128  * @note Multiple registration requests will overwrite any possible existing registration. 
00129  *
00130  * @param[in] event_handler         The function to be called by the transport layer upon TX done
00131  *                                  event.
00132  *
00133  * @retval NRF_SUCCESS              Operation success.
00134  * @retval NRF_ERROR_NULL           Operation failure. NULL pointer supplied.    
00135  */
00136 uint32_t hci_transport_tx_done_register(hci_transport_tx_done_handler_t event_handler);
00137                                         
00138 /**@brief Function for opening the transport channel and initializing the transport layer.
00139  *
00140  * @warning Must not be called for a channel which has been allready opened. 
00141  * 
00142  * @retval NRF_SUCCESS              Operation success.
00143  * @retval NRF_ERROR_INTERNAL       Operation failure. Internal error ocurred. 
00144  */
00145 uint32_t hci_transport_open(void);
00146 
00147 /**@brief Function for closing the transport channel.
00148  *
00149  * @note Can be called multiple times and also for not opened channel.
00150  * 
00151  * @retval NRF_SUCCESS              Operation success.  
00152  */
00153 uint32_t hci_transport_close(void);
00154 
00155 /**@brief Function for allocating tx packet memory.
00156  * 
00157  * @param[out] pp_memory            Pointer to the packet data.
00158  * 
00159  * @retval NRF_SUCCESS              Operation success. Memory was allocated.
00160  * @retval NRF_ERROR_NO_MEM         Operation failure. No memory available.
00161  * @retval NRF_ERROR_NULL           Operation failure. NULL pointer supplied.   
00162  */
00163 uint32_t hci_transport_tx_alloc(uint8_t ** pp_memory);
00164 
00165 /**@brief Function for freeing tx packet memory.
00166  *
00167  * @note Memory management works in FIFO principle meaning that free order must match the alloc 
00168  *       order.
00169  * 
00170  * @retval NRF_SUCCESS              Operation success. Memory was freed.   
00171  */
00172 uint32_t hci_transport_tx_free(void);
00173 
00174 /**@brief Function for writing a packet.
00175  *
00176  * @note Completion of this method does not guarantee that actual peripheral transmission would 
00177  *       have completed.
00178  *
00179  * @note In case of 0 byte packet length write request, message will consist of only transport 
00180  *       module specific headers.  
00181  *
00182  * @retval NRF_SUCCESS              Operation success. Packet was added to the transmission queue 
00183  *                                  and an event will be send upon transmission completion. 
00184  * @retval NRF_ERROR_NO_MEM         Operation failure. Transmission queue is full and packet was not
00185  *                                  added to the transmission queue. User should wait for 
00186  *                                  a appropriate event prior issuing this operation again.
00187  * @retval NRF_ERROR_DATA_SIZE      Operation failure. Packet size exceeds limit.   
00188  * @retval NRF_ERROR_NULL           Operation failure. NULL pointer supplied.  
00189  * @retval NRF_ERROR_INVALID_STATE  Operation failure. Channel is not open.
00190  */
00191 uint32_t hci_transport_pkt_write(const uint8_t * p_buffer, uint32_t length);
00192 
00193 /**@brief Function for extracting received packet.
00194  *
00195  * @note Extracted memory can't be reused by the underlying transport layer untill freed by call to 
00196  *       hci_transport_rx_pkt_consume().
00197  *
00198  * @param[out] pp_buffer            Pointer to the packet data.
00199  * @param[out] p_length             Length of packet data in bytes.  
00200  *
00201  * @retval NRF_SUCCESS              Operation success. Packet was extracted. 
00202  * @retval NRF_ERROR_NO_MEM         Operation failure. No packet available to extract.
00203  * @retval NRF_ERROR_NULL           Operation failure. NULL pointer supplied.   
00204  */
00205 uint32_t hci_transport_rx_pkt_extract(uint8_t ** pp_buffer, uint32_t * p_length);
00206 
00207 /**@brief Function for consuming extracted packet described by p_buffer.
00208  *
00209  * RX memory pointed to by p_buffer is freed and can be reused by the underlying transport layer.
00210  *
00211  * @param[in] p_buffer              Pointer to the buffer that has been consumed.
00212  *
00213  * @retval NRF_SUCCESS              Operation success. 
00214  * @retval NRF_ERROR_NO_MEM         Operation failure. No packet available to consume. 
00215  * @retval NRF_ERROR_INVALID_ADDR   Operation failure. Not a valid pointer. 
00216  */
00217 uint32_t hci_transport_rx_pkt_consume(uint8_t * p_buffer);
00218 
00219 #endif // HCI_TRANSPORT_H__
00220 
00221 /** @} */