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Shuanglei Tao
2024-11-11 15:24:18 +08:00
commit f353d23368
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122
components/ble/peer_manager/pm_buffer.c Normal file
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/* Copyright (c) 2015 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.
*
*/
#include "pm_buffer.h"
#include <stdbool.h>
#include <string.h>
#include "nrf_error.h"
#include "pm_mutex.h"
#define BUFFER_IS_VALID(p_buffer) ((p_buffer != NULL) \
&& (p_buffer->p_memory != NULL) \
&& (p_buffer->p_mutex != NULL))
ret_code_t pm_buffer_init(pm_buffer_t * p_buffer,
uint8_t * p_buffer_memory,
uint32_t buffer_memory_size,
uint8_t * p_mutex_memory,
uint32_t mutex_memory_size,
uint32_t n_blocks,
uint32_t block_size)
{
if ( (p_buffer != NULL)
&& (p_buffer_memory != NULL)
&& (p_mutex_memory != NULL)
&& (buffer_memory_size >= (n_blocks*block_size))
&& (mutex_memory_size >= MUTEX_STORAGE_SIZE(n_blocks))
&& (n_blocks != 0)
&& (block_size != 0))
{
p_buffer->p_memory = p_buffer_memory;
p_buffer->p_mutex = p_mutex_memory;
p_buffer->n_blocks = n_blocks;
p_buffer->block_size = block_size;
pm_mutex_init(p_buffer->p_mutex, n_blocks);
return NRF_SUCCESS;
}
else
{
return NRF_ERROR_INVALID_PARAM;
}
}
uint8_t pm_buffer_block_acquire(pm_buffer_t * p_buffer, uint32_t n_blocks)
{
if (!BUFFER_IS_VALID(p_buffer))
{
return ( BUFFER_INVALID_ID );
}
uint8_t first_locked_mutex = BUFFER_INVALID_ID;
for (uint8_t i = 0; i < p_buffer->n_blocks; i++)
{
if (pm_mutex_lock(p_buffer->p_mutex, i))
{
if (first_locked_mutex == BUFFER_INVALID_ID)
{
first_locked_mutex = i;
}
if ((i - first_locked_mutex + 1) == n_blocks)
{
return first_locked_mutex;
}
}
else if (first_locked_mutex != BUFFER_INVALID_ID)
{
for (uint8_t j = first_locked_mutex; j < i; j++)
{
pm_buffer_release(p_buffer, j);
}
first_locked_mutex = BUFFER_INVALID_ID;
}
}
return ( BUFFER_INVALID_ID );
}
uint8_t * pm_buffer_ptr_get(pm_buffer_t * p_buffer, uint8_t id)
{
if (!BUFFER_IS_VALID(p_buffer))
{
return ( NULL );
}
if ( (id != BUFFER_INVALID_ID)
&& pm_mutex_lock_status_get(p_buffer->p_mutex, id) )
{
return ( &p_buffer->p_memory[id*p_buffer->block_size] );
}
else
{
return ( NULL );
}
}
void pm_buffer_release(pm_buffer_t * p_buffer, uint8_t id)
{
if ( BUFFER_IS_VALID(p_buffer)
&& (id != BUFFER_INVALID_ID)
&& pm_mutex_lock_status_get(p_buffer->p_mutex, id))
{
pm_mutex_unlock(p_buffer->p_mutex, id);
}
}