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/**
* \file
*
* \brief Global interrupt management for SAM D20, SAM3 and SAM4 (NVIC based)
*
* Copyright (c) 2012-2015 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* \asf_license_stop
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#include "interrupt_sam_nvic.h"
#if !defined(__DOXYGEN__)
/* Deprecated - global flag to determine the global interrupt state. Required by
* QTouch library, however new applications should use cpu_irq_is_enabled()
* which probes the true global interrupt state from the CPU special registers.
*/
volatile bool g_interrupt_enabled = true;
#endif
void cpu_irq_enter_critical(void)
{
if (cpu_irq_critical_section_counter == 0) {
if (cpu_irq_is_enabled()) {
cpu_irq_disable();
cpu_irq_prev_interrupt_state = true;
} else {
/* Make sure the to save the prev state as false */
cpu_irq_prev_interrupt_state = false;
}
}
cpu_irq_critical_section_counter++;
}
void cpu_irq_leave_critical(void)
{
/* Check if the user is trying to leave a critical section when not in a critical section */
Assert(cpu_irq_critical_section_counter > 0);
cpu_irq_critical_section_counter--;
/* Only enable global interrupts when the counter reaches 0 and the state of the global interrupt flag
was enabled when entering critical state */
if ((cpu_irq_critical_section_counter == 0) && (cpu_irq_prev_interrupt_state)) {
cpu_irq_enable();
}
}
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