trezor-firmware/core/embed/trezorhal/systick.c

// clang-format off

/*
 * This file is part of the Trezor project, https://trezor.io/
 *
 * Copyright (c) SatoshiLabs
 *
 * 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/>.
 */

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013, 2014 Damien P. George
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "irq.h"
#include "systick.h"

#ifdef RDI
  #include "random_delays.h"
#endif

#include "systemview.h"

extern __IO uint32_t uwTick;

systick_dispatch_t systick_dispatch_table[SYSTICK_DISPATCH_NUM_SLOTS];

void SysTick_Handler(void) {
  SEGGER_SYSVIEW_RecordEnterISR();
  // this is a millisecond tick counter that wraps after approximately
  // 49.71 days = (0xffffffff / (24 * 60 * 60 * 1000))
  uint32_t uw_tick = uwTick + 1;
  uwTick = uw_tick;
#ifdef RDI
    rdi_handler(uw_tick);
#endif
  systick_dispatch_t f = systick_dispatch_table[uw_tick & (SYSTICK_DISPATCH_NUM_SLOTS - 1)];
  if (f != NULL) {
    f(uw_tick);
  }
  SEGGER_SYSVIEW_RecordExitISR();
}