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- #include "sdk_common.h"
- #if NRF_MODULE_ENABLED(PEER_MANAGER)
- #include "pm_buffer.h"
- #include <stdbool.h>
- #include <string.h>
- #include "nrf_error.h"
- #include "nrf_atflags.h"
- #define BUFFER_IS_VALID(p_buffer) ((p_buffer != NULL) \
- && (p_buffer->p_memory != NULL) \
- && (p_buffer->p_mutex != NULL))
- static bool mutex_lock(nrf_atflags_t * p_mutex, uint32_t mutex_id)
- {
- bool locked = !nrf_atflags_fetch_set(p_mutex, mutex_id);
- __DMB();
- return locked;
- }
- static void mutex_unlock(nrf_atflags_t * p_mutex, uint32_t mutex_id)
- {
- __DMB();
- nrf_atflags_clear(p_mutex, mutex_id);
- }
- static bool mutex_lock_status_get(nrf_atflags_t * p_mutex, uint32_t mutex_id)
- {
- __DMB();
- return nrf_atflags_get(p_mutex, mutex_id);
- }
- ret_code_t pm_buffer_init(pm_buffer_t * p_buffer,
- uint8_t * p_buffer_memory,
- uint32_t buffer_memory_size,
- nrf_atflags_t * p_mutex_memory,
- 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))
- && (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;
- 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 ( PM_BUFFER_INVALID_ID );
- }
- uint8_t first_locked_mutex = PM_BUFFER_INVALID_ID;
- for (uint8_t i = 0; i < p_buffer->n_blocks; i++)
- {
- if (mutex_lock(p_buffer->p_mutex, i))
- {
- if (first_locked_mutex == PM_BUFFER_INVALID_ID)
- {
- first_locked_mutex = i;
- }
- if ((i - first_locked_mutex + 1U) == n_blocks)
- {
- return first_locked_mutex;
- }
- }
- else if (first_locked_mutex != PM_BUFFER_INVALID_ID)
- {
- for (uint8_t j = first_locked_mutex; j < i; j++)
- {
- pm_buffer_release(p_buffer, j);
- }
- first_locked_mutex = PM_BUFFER_INVALID_ID;
- }
- }
- return ( PM_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 != PM_BUFFER_INVALID_ID)
- && 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 != PM_BUFFER_INVALID_ID)
- && mutex_lock_status_get(p_buffer->p_mutex, id))
- {
- mutex_unlock(p_buffer->p_mutex, id);
- }
- }
- #endif
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