kopia lustrzana https://github.com/micropython/micropython
68 wiersze
2.5 KiB
C
68 wiersze
2.5 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "py/runtime.h"
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#include "py/mphal.h"
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#include "systick.h"
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#include "pendsv.h"
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#include "shared/runtime/softtimer.h"
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volatile uint32_t systick_ms = 0;
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systick_dispatch_t systick_dispatch_table[SYSTICK_DISPATCH_NUM_SLOTS];
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void SysTick_Handler(void) {
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// Instead of calling HAL_IncTick we do the increment here of the counter.
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// This is purely for efficiency, since SysTick is called 1000 times per
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// second at the highest interrupt priority.
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uint32_t uw_tick = systick_ms + 1;
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systick_ms = uw_tick;
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// Dispatch to any registered handlers in a cycle
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systick_dispatch_t f = systick_dispatch_table[uw_tick & (SYSTICK_DISPATCH_NUM_SLOTS - 1)];
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if (f != NULL) {
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f(uw_tick);
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}
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if (soft_timer_next == uw_tick) {
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pendsv_schedule_dispatch(PENDSV_DISPATCH_SOFT_TIMER, soft_timer_handler);
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}
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}
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bool systick_has_passed(uint32_t start_tick, uint32_t delay_ms) {
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return systick_ms - start_tick >= delay_ms;
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}
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// waits until at least delay_ms milliseconds have passed from the sampling of
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// startTick. Handles overflow properly. Assumes stc was taken from
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// HAL_GetTick() some time before calling this function.
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void systick_wait_at_least(uint32_t start_tick, uint32_t delay_ms) {
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while (!systick_has_passed(start_tick, delay_ms)) {
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__WFI(); // enter sleep mode, waiting for interrupt
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}
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}
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