72 lines
2.6 KiB
C
72 lines
2.6 KiB
C
/*
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* This file is part of the Micro Python 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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* Copyright (c) 2015 Daniel Campora
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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/mpconfig.h"
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#include "py/obj.h"
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#include "py/mphal.h"
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#include "mpsystick.h"
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#include "systick.h"
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#include "inc/hw_types.h"
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#include "inc/hw_nvic.h"
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#ifdef USE_FREERTOS
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#include "FreeRTOS.h"
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#include "task.h"
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#endif
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bool sys_tick_has_passed(uint32_t start_tick, uint32_t delay_ms) {
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return mp_hal_ticks_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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// mp_hal_ticks_ms() some time before calling this function.
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void sys_tick_wait_at_least(uint32_t start_tick, uint32_t delay_ms) {
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#ifdef USE_FREERTOS
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vTaskDelay (delay_ms / portTICK_PERIOD_MS);
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#else
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while (!sys_tick_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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#endif
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}
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// The SysTick timer counts down at HAL_FCPU_HZ, so we can use that knowledge
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// to grab a microsecond counter.
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// We assume that mp_hal_ticks_ms returns milliseconds.
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uint32_t sys_tick_get_microseconds(void) {
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mp_uint_t irq_state = disable_irq();
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uint32_t counter = SysTickValueGet();
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uint32_t milliseconds = mp_hal_ticks_ms();
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enable_irq(irq_state);
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uint32_t load = SysTickPeriodGet();
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counter = load - counter; // Convert from decrementing to incrementing
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return (milliseconds * 1000) + ((counter * 1000) / load);
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}
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