kopia lustrzana https://github.com/micropython/micropython
72 wiersze
2.6 KiB
C
72 wiersze
2.6 KiB
C
/*
|
|
* This file is part of the Micro Python project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2013, 2014 Damien P. George
|
|
* Copyright (c) 2015 Daniel Campora
|
|
*
|
|
* 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/mpconfig.h"
|
|
#include "py/obj.h"
|
|
#include "py/mphal.h"
|
|
#include "mpsystick.h"
|
|
#include "systick.h"
|
|
#include "inc/hw_types.h"
|
|
#include "inc/hw_nvic.h"
|
|
|
|
#ifdef USE_FREERTOS
|
|
#include "FreeRTOS.h"
|
|
#include "task.h"
|
|
#endif
|
|
|
|
|
|
bool sys_tick_has_passed(uint32_t start_tick, uint32_t delay_ms) {
|
|
return mp_hal_ticks_ms() - start_tick >= delay_ms;
|
|
}
|
|
|
|
// waits until at least delay_ms milliseconds have passed from the sampling of
|
|
// startTick. Handles overflow properly. Assumes stc was taken from
|
|
// mp_hal_ticks_ms() some time before calling this function.
|
|
void sys_tick_wait_at_least(uint32_t start_tick, uint32_t delay_ms) {
|
|
#ifdef USE_FREERTOS
|
|
vTaskDelay (delay_ms / portTICK_PERIOD_MS);
|
|
#else
|
|
while (!sys_tick_has_passed(start_tick, delay_ms)) {
|
|
__WFI(); // enter sleep mode, waiting for interrupt
|
|
}
|
|
#endif
|
|
}
|
|
|
|
// The SysTick timer counts down at HAL_FCPU_HZ, so we can use that knowledge
|
|
// to grab a microsecond counter.
|
|
// We assume that mp_hal_ticks_ms returns milliseconds.
|
|
uint32_t sys_tick_get_microseconds(void) {
|
|
mp_uint_t irq_state = disable_irq();
|
|
uint32_t counter = SysTickValueGet();
|
|
uint32_t milliseconds = mp_hal_ticks_ms();
|
|
enable_irq(irq_state);
|
|
|
|
uint32_t load = SysTickPeriodGet();
|
|
counter = load - counter; // Convert from decrementing to incrementing
|
|
return (milliseconds * 1000) + ((counter * 1000) / load);
|
|
}
|