// Copyright (C) 2025 Thies Lennart Alff
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
// USA

#pragma once
#include <sam.h>
#include <stdbool.h>

#ifndef NULL
  #define NULL  ((void*)0)
#endif

#ifdef DEBUG
#include "SEGGER_RTT.h"
#define DEBUG_PRINT(...) SEGGER_RTT_printf(0, "DEBUG: " __VA_ARGS__)
#else
#define DEBUG_PRINT(...) do {} while(0)
#endif

static volatile uint32_t critical_section_counter = 0;
static volatile bool critical_section_previous_state = false;

static inline void interrupts_enable() {
  __DMB();
  __enable_irq();
}

static inline void interrupts_disable() {
  __disable_irq();
  __DMB();
}

static inline bool interrupts_are_enabled() {
  return __get_PRIMASK() == 0;
}

static inline uint32_t interrupts_save() {
  volatile uint32_t flags = interrupts_are_enabled();
  interrupts_disable();
  return flags;
}

void enter_critical();
void leave_ciritical();