critreg.c

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/**********************************************************************/
/*
 * Copyright (c) 2016, Jetro AS
 * All rights reserved.
 *
 * Reproduction or redistribution of this file is prohibited, unless such reproduction
 * or redistribution is explicitly permitted by a license agreement.
 */

 /**
 * \file
 * \brief Fast version of nRF soft-device-friendly critical regions.
 * Original Nordic critical region implementation masks user interrupts in NVIC,
 * which is a perfectly fine, but quite slow method. This implementation uses
 * other approach: it disables application interrupts via BASEPRI register,
 * which is much faster. High-priority softdevice interrupts are not affected.
 *
 * \author DT, Jetro AS
 */ /******************************************************************/

#include <app_util_platform.h>
#include <app_util.h>
#include <lib/assert.h>

static uint32_t IrqDisableCounter;

STATIC_ASSERT(APP_IRQ_PRIORITY_HIGH != 0);

void app_util_disable_irq(void)
{
  __disable_irq();
  ++IrqDisableCounter;
}

void app_util_enable_irq(void)
{
  assert(IrqDisableCounter);
  if (--IrqDisableCounter == 0)
    __enable_irq();
}

void app_util_critical_region_enter(uint8_t *p_nested)
{
  __disable_irq();
  *p_nested = __get_BASEPRI();
  __set_BASEPRI_MAX(APP_IRQ_PRIORITY_HIGH << (8U - __NVIC_PRIO_BITS));
  __enable_irq();
}

void app_util_critical_region_exit(uint8_t nested)
{
  __set_BASEPRI(nested);
}