text: /*! \copyright
   
     https://opensource.org/licenses/BSD-3-Clause
   
     Copyright 2013-2021 Marco Bacchi <marco@bacchi.at>
     
     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. Neither the name of the copyright holder nor the names of its 
     contributors may be used to endorse or promote products derived from this 
     software without specific prior written permission.
  
     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
     AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
     IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
     ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS 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.
  */
  
  #ifndef CRITICAL_ARCH_H_
  #define CRITICAL_ARCH_H_
  
  #include "main.h"
  
  
  
  /* Read PRIMASK register, check interrupt status before you disable them */
  /* Returns 0 if they are enabled, or non-zero if disabled */
  /* Disable interrupts */
  #define CRITICAL_ARCH_SECTION_BEGIN() \
  	do{ \
  		bool istate = !__get_PRIMASK(); \
  		__disable_irq();
  
  /* Enable interrupts back only if they were enabled before we disable it here in this function */
  #define CRITICAL_ARCH_SECTION_END()   \
  		if( istate ) __enable_irq(); \
  	}while(0)
  
  #define CRITICAL_ARCH_EXPRESSION(x) \
     CRITICAL_SECTION_BEGIN(); \
     x; \
     CRITICAL_SECTION_END();
  
  #endif /* CRITICAL_ARCH_H_ */
  