scb.hpp

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/*
 * OpenMPTL - C++ Microprocessor Template Library
 *
 * Copyright (C) 2012-2017 Axel Burri <axel@tty0.ch>
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef ARM_CORTEX_COMMON_SCB_HPP_INCLUDED
#define ARM_CORTEX_COMMON_SCB_HPP_INCLUDED

#include "reg/scb.hpp"

#if 0  // TODO: fixme

namespace mptl {

template<unsigned priority_bits>
class scb
{
public:

  static void set_priority_group(uint32_t group) {
    // assert(group == (group & 0x07));

    SCB::AIRCR::set<SCB::AIRCR::VECTKEY, SCB::AIRCR::PRIGROUP>
      ( SCB::AIRCR::VECTKEY ::shifted_value(0x5FA) |
        SCB::AIRCR::PRIGROUP::shifted_value(group) );
  }

  static uint32_t get_priority_group(void) {
    return SCB::AIRCR::PRIGROUP::test_and_shift();
  }

  template<int irqn>
  static void set_priority(uint32_t priority) {
    static_assert(irqn < 0 && irqn > -13, "illegal core exception interrupt number");
    SCB::SHPR<((uint32_t)irqn & 0xf)-4>::store((priority << (8 - priority_bits)) & 0xff);
  }

  template<int irqn>
  static uint32_t get_priority(void) {
    static_assert(irqn < 0 && irqn > -13, "illegal core exception interrupt number");
    return((uint32_t)(SCB::SHPR<((uint32_t)irqn & 0xf)-4>::load() >> (8 - priority_bits)));
  }
};

} // namespace mptl

#endif

#endif // ARM_CORTEX_COMMON_SCB_HPP_INCLUDED