mirror of
https://github.com/pengwon/epd42.git
synced 2026-04-05 12:35:05 +08:00
116 lines
2.4 KiB
C
116 lines
2.4 KiB
C
/* 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_mutex.h"
|
|
|
|
#include <stdbool.h>
|
|
#include <string.h>
|
|
#include "nrf_error.h"
|
|
#include "app_util_platform.h"
|
|
|
|
|
|
|
|
/**@brief Locks the mutex defined by the mask.
|
|
*
|
|
* @param p_mutex pointer to the mutex storage.
|
|
* @param mutex_mask the mask identifying the mutex position.
|
|
*
|
|
* @retval true if the mutex could be locked.
|
|
* @retval false if the mutex was already locked.
|
|
*/
|
|
static bool lock_by_mask(uint8_t * p_mutex, uint8_t mutex_mask)
|
|
{
|
|
bool success = false;
|
|
|
|
if ( (*p_mutex & mutex_mask) == 0 )
|
|
{
|
|
CRITICAL_REGION_ENTER();
|
|
if ( (*p_mutex & mutex_mask) == 0 )
|
|
{
|
|
*p_mutex |= mutex_mask;
|
|
|
|
success = true;
|
|
}
|
|
CRITICAL_REGION_EXIT();
|
|
}
|
|
|
|
return ( success );
|
|
}
|
|
|
|
|
|
void pm_mutex_init(uint8_t * p_mutex, uint16_t mutex_size)
|
|
{
|
|
if (p_mutex != NULL)
|
|
{
|
|
memset(&p_mutex[0], 0, MUTEX_STORAGE_SIZE(mutex_size));
|
|
}
|
|
}
|
|
|
|
|
|
bool pm_mutex_lock(uint8_t * p_mutex, uint16_t mutex_id)
|
|
{
|
|
if (p_mutex != NULL)
|
|
{
|
|
return ( lock_by_mask(&(p_mutex[mutex_id >> 3]), (1 << (mutex_id & 0x07))) );
|
|
}
|
|
else
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
|
|
|
|
void pm_mutex_unlock(uint8_t * p_mutex, uint16_t mutex_id)
|
|
{
|
|
uint8_t mutex_base = mutex_id >> 3;
|
|
uint8_t mutex_mask = (1 << (mutex_id & 0x07));
|
|
|
|
if ((p_mutex != NULL)
|
|
&& (p_mutex[mutex_base] & mutex_mask))
|
|
{
|
|
CRITICAL_REGION_ENTER();
|
|
p_mutex[mutex_base] &= ~mutex_mask;
|
|
CRITICAL_REGION_EXIT();
|
|
}
|
|
}
|
|
|
|
|
|
uint16_t pm_mutex_lock_first_available(uint8_t * p_mutex, uint16_t mutex_size)
|
|
{
|
|
if (p_mutex != NULL)
|
|
{
|
|
for ( uint16_t i = 0; i < mutex_size; i++ )
|
|
{
|
|
if ( lock_by_mask(&(p_mutex[i >> 3]), 1 << (i & 0x07)) )
|
|
{
|
|
return ( i );
|
|
}
|
|
}
|
|
}
|
|
|
|
return ( mutex_size );
|
|
}
|
|
|
|
|
|
bool pm_mutex_lock_status_get(uint8_t * p_mutex, uint16_t mutex_id)
|
|
{
|
|
if (p_mutex != NULL)
|
|
{
|
|
return ( (p_mutex[mutex_id >> 3] & (1 << (mutex_id & 0x07))) );
|
|
}
|
|
else
|
|
{
|
|
return true;
|
|
}
|
|
}
|