circuitpython/shared-module/time/__init__.c

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
 *
 * 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 "py/mphal.h"
#include "supervisor/port.h"
#include "supervisor/shared/tick.h"
#include "shared-bindings/time/__init__.h"

uint64_t common_hal_time_monotonic_ms(void) {
    return supervisor_ticks_ms64();
}

uint64_t common_hal_time_monotonic_ns(void) {
    uint8_t subticks = 0;
    uint64_t ticks = port_get_raw_ticks(&subticks);
    // A tick is 976562.5 nanoseconds so multiply it by the base and add half instead of doing float
    // math.
    // A subtick is 1/32 of a tick.
    // 30518 is 1e9 / 32768
    return 976562 * ticks + ticks / 2 + 30518 * subticks;
}

void common_hal_time_delay_ms(uint32_t delay) {
    mp_hal_delay_ms(delay);
}