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123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/* Copyright (c) 2015 Nordic Semiconductor. All Rights Reserved.
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*
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* The information contained herein is property of Nordic Semiconductor ASA.
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* Terms and conditions of usage are described in detail in NORDIC
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* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
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*
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* Licensees are granted free, non-transferable use of the information. NO
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* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
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* the file.
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*
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*/
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#include "pm_buffer.h"
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#include <stdbool.h>
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#include <string.h>
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#include "nrf_error.h"
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#include "pm_mutex.h"
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#define BUFFER_IS_VALID(p_buffer) ((p_buffer != NULL) \
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&& (p_buffer->p_memory != NULL) \
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&& (p_buffer->p_mutex != NULL))
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ret_code_t pm_buffer_init(pm_buffer_t * p_buffer,
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uint8_t * p_buffer_memory,
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uint32_t buffer_memory_size,
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uint8_t * p_mutex_memory,
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uint32_t mutex_memory_size,
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uint32_t n_blocks,
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uint32_t block_size)
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{
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if ( (p_buffer != NULL)
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&& (p_buffer_memory != NULL)
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&& (p_mutex_memory != NULL)
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&& (buffer_memory_size >= (n_blocks*block_size))
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&& (mutex_memory_size >= MUTEX_STORAGE_SIZE(n_blocks))
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&& (n_blocks != 0)
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&& (block_size != 0))
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{
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p_buffer->p_memory = p_buffer_memory;
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p_buffer->p_mutex = p_mutex_memory;
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p_buffer->n_blocks = n_blocks;
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p_buffer->block_size = block_size;
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pm_mutex_init(p_buffer->p_mutex, n_blocks);
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return NRF_SUCCESS;
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}
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else
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{
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return NRF_ERROR_INVALID_PARAM;
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}
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}
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uint8_t pm_buffer_block_acquire(pm_buffer_t * p_buffer, uint32_t n_blocks)
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{
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if (!BUFFER_IS_VALID(p_buffer))
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{
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return ( BUFFER_INVALID_ID );
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}
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uint8_t first_locked_mutex = BUFFER_INVALID_ID;
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for (uint8_t i = 0; i < p_buffer->n_blocks; i++)
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{
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if (pm_mutex_lock(p_buffer->p_mutex, i))
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{
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if (first_locked_mutex == BUFFER_INVALID_ID)
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{
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first_locked_mutex = i;
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}
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if ((i - first_locked_mutex + 1) == n_blocks)
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{
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return first_locked_mutex;
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}
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}
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else if (first_locked_mutex != BUFFER_INVALID_ID)
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{
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for (uint8_t j = first_locked_mutex; j < i; j++)
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{
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pm_buffer_release(p_buffer, j);
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}
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first_locked_mutex = BUFFER_INVALID_ID;
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}
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}
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return ( BUFFER_INVALID_ID );
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}
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uint8_t * pm_buffer_ptr_get(pm_buffer_t * p_buffer, uint8_t id)
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{
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if (!BUFFER_IS_VALID(p_buffer))
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{
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return ( NULL );
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}
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if ( (id != BUFFER_INVALID_ID)
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&& pm_mutex_lock_status_get(p_buffer->p_mutex, id) )
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{
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return ( &p_buffer->p_memory[id*p_buffer->block_size] );
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}
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else
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{
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return ( NULL );
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}
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}
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void pm_buffer_release(pm_buffer_t * p_buffer, uint8_t id)
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{
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if ( BUFFER_IS_VALID(p_buffer)
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&& (id != BUFFER_INVALID_ID)
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&& pm_mutex_lock_status_get(p_buffer->p_mutex, id))
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{
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pm_mutex_unlock(p_buffer->p_mutex, id);
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}
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}
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