| /** | |
| * \file | |
| * | |
| * \brief Global interrupt management for SAM D20, SAM3 and SAM4 (NVIC based) | |
| * | |
| * Copyright (c) 2012-2013 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 | |
| * | |
| */ | |
| #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(); | |
| } | |
| } | |