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Dependents: BLE_Acceleration_Statejudging
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Diff: nordic/nrf-sdk/app_common/hci_mem_pool.h
- Revision:
- 0:eff01767de02
- Child:
- 37:c29c330d942c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/nordic/nrf-sdk/app_common/hci_mem_pool.h Wed Mar 26 14:38:17 2014 +0000 @@ -0,0 +1,133 @@ +/* Copyright (c) 2013 Nordic Semiconductor. All Rights Reserved. + * + * The information contained herein is property of Nordic Semiconductor ASA. + * Terms and conditions of usage are described in detail in NORDIC + * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT. + * + * Licensees are granted free, non-transferable use of the information. NO + * WARRANTY of ANY KIND is provided. This heading must NOT be removed from + * the file. + * + */ + +/** @file + * + * @defgroup memory_pool Memory pool + * @{ + * @ingroup app_common + * + * @brief Memory pool implementation + * + * Memory pool implementation, based on circular buffer data structure, which supports asynchronous + * processing of RX data. The current default implementation supports 1 TX buffer and 4 RX buffers. + * The memory managed by the pool is allocated from static storage instead of heap. The internal + * design of the circular buffer implementing the RX memory layout is illustrated in the picture + * below. + * + * @image html memory_pool.png "Circular buffer design" + * + * The expected call order for the RX APIs is as follows: + * - hci_mem_pool_rx_produce + * - hci_mem_pool_rx_data_size_set + * - hci_mem_pool_rx_extract + * - hci_mem_pool_rx_consume + * + * @warning If the above mentioned expected call order is violated the end result can be undefined. + * + * \par Component specific configuration options + * + * The following compile time configuration options are available to suit various implementations: + * - TX_BUF_SIZE TX buffer size in bytes. + * - RX_BUF_SIZE RX buffer size in bytes. + * - RX_BUF_QUEUE_SIZE RX buffer element size. + */ + +#ifndef HCI_MEM_POOL_H__ +#define HCI_MEM_POOL_H__ + +#include <stdint.h> +#include "nordic_global.h" +#include "nrf_error.h" + +/**@brief Function for opening the module. + * + * @retval NRF_SUCCESS Operation success. + */ +uint32_t hci_mem_pool_open(void); + +/**@brief Function for closing the module. + * + * @retval NRF_SUCCESS Operation success. + */ +uint32_t hci_mem_pool_close(void); + +/**@brief Function for allocating requested amount of TX memory. + * + * @param[out] pp_buffer Pointer to the allocated memory. + * + * @retval NRF_SUCCESS Operation success. Memory was allocated. + * @retval NRF_ERROR_NO_MEM Operation failure. No memory available for allocation. + * @retval NRF_ERROR_NULL Operation failure. NULL pointer supplied. + */ +uint32_t hci_mem_pool_tx_alloc(void ** pp_buffer); + +/**@brief Function for freeing previously allocated TX memory. + * + * @note Memory management follows the FIFO principle meaning that free() order must match the + * alloc(...) order, which is the reason for omitting exact memory block identifier as an + * input parameter. + * + * @retval NRF_SUCCESS Operation success. Memory was freed. + */ +uint32_t hci_mem_pool_tx_free(void); + +/**@brief Function for producing a free RX memory block for usage. + * + * @note Upon produce request amount being 0, NRF_SUCCESS is returned. + * + * @param[in] length Amount, in bytes, of free memory to be produced. + * @param[out] pp_buffer Pointer to the allocated memory. + * + * @retval NRF_SUCCESS Operation success. Free RX memory block produced. + * @retval NRF_ERROR_NO_MEM Operation failure. No suitable memory available for allocation. + * @retval NRF_ERROR_DATA_SIZE Operation failure. Request size exceeds limit. + * @retval NRF_ERROR_NULL Operation failure. NULL pointer supplied. + */ +uint32_t hci_mem_pool_rx_produce(uint32_t length, void ** pp_buffer); + +/**@brief Function for setting the length of the last produced RX memory block. + * + * @warning If call to this API is omitted the end result is that the following call to + * mem_pool_rx_extract will return incorrect data in the p_length output parameter. + * + * @param[in] length Amount, in bytes, of actual memory used. + * + * @retval NRF_SUCCESS Operation success. Length was set. + */ +uint32_t hci_mem_pool_rx_data_size_set(uint32_t length); + +/**@brief Function for extracting a packet, which has been filled with read data, for further + * processing. + * + * @param[out] pp_buffer Pointer to the packet data. + * @param[out] p_length Length of packet data in bytes. + * + * @retval NRF_SUCCESS Operation success. + * @retval NRF_ERROR_NO_MEM Operation failure. No packet available to extract. + * @retval NRF_ERROR_NULL Operation failure. NULL pointer supplied. + */ +uint32_t hci_mem_pool_rx_extract(uint8_t ** pp_buffer, uint32_t * p_length); + +/**@brief Function for freeing previously extracted packet, which has been filled with read data. + * + * @param[in] p_buffer Pointer to consumed buffer. + * + * @retval NRF_SUCCESS Operation success. + * @retval NRF_ERROR_NO_MEM Operation failure. No packet available to free. + * @retval NRF_ERROR_INVALID_ADDR Operation failure. Not a valid pointer. + */ +uint32_t hci_mem_pool_rx_consume(uint8_t * p_buffer); + +#endif // HCI_MEM_POOL_H__ + +/** @} */