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a5d97f1db9
This commit adds an implementation of a "software timer" with a 1ms resolution, using SysTick. It allows unlimited number of concurrent timers (limited only by memory needed for each timer entry). They can be one-shot or periodic, and associated with a Python callback. There is a very small overhead added to the SysTick IRQ, which could be further optimised in the future, eg by patching SysTick_Handler code dynamically.
51 lines
1.9 KiB
C
51 lines
1.9 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) 2019 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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#ifndef MICROPY_INCLUDED_STM32_SOFTTIMER_H
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#define MICROPY_INCLUDED_STM32_SOFTTIMER_H
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#include "py/obj.h"
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#define SOFT_TIMER_MODE_ONE_SHOT (1)
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#define SOFT_TIMER_MODE_PERIODIC (2)
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typedef struct _soft_timer_entry_t {
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mp_obj_base_t base; // so struct can be used as an object and still be traced by GC
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struct _soft_timer_entry_t *next;
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uint32_t mode;
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uint32_t expiry_ms;
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uint32_t delta_ms; // for periodic mode
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mp_obj_t callback;
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} soft_timer_entry_t;
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extern volatile uint32_t soft_timer_next;
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void soft_timer_deinit(void);
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void soft_timer_handler(void);
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void soft_timer_insert(soft_timer_entry_t *entry);
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void soft_timer_remove(soft_timer_entry_t *entry);
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#endif // MICROPY_INCLUDED_STM32_SOFTTIMER_H
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