99 lines
3.9 KiB
C
99 lines
3.9 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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#include <stdint.h>
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#include "py/runtime.h"
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#include "irq.h"
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#include "softtimer.h"
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#define TICKS_PERIOD 0x80000000
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#define TICKS_DIFF(t1, t0) ((int32_t)(((t1 - t0 + TICKS_PERIOD / 2) & (TICKS_PERIOD - 1)) - TICKS_PERIOD / 2))
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extern __IO uint32_t uwTick;
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volatile uint32_t soft_timer_next;
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void soft_timer_deinit(void) {
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MP_STATE_PORT(soft_timer_heap) = NULL;
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}
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STATIC int soft_timer_lt(mp_pairheap_t *n1, mp_pairheap_t *n2) {
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soft_timer_entry_t *e1 = (soft_timer_entry_t *)n1;
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soft_timer_entry_t *e2 = (soft_timer_entry_t *)n2;
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return TICKS_DIFF(e1->expiry_ms, e2->expiry_ms) < 0;
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}
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STATIC void soft_timer_schedule_systick(uint32_t ticks_ms) {
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uint32_t irq_state = disable_irq();
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uint32_t uw_tick = uwTick;
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if (TICKS_DIFF(ticks_ms, uw_tick) <= 0) {
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soft_timer_next = uw_tick + 1;
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} else {
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soft_timer_next = ticks_ms;
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}
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enable_irq(irq_state);
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}
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// Must be executed at IRQ_PRI_PENDSV
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void soft_timer_handler(void) {
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uint32_t ticks_ms = uwTick;
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soft_timer_entry_t *heap = MP_STATE_PORT(soft_timer_heap);
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while (heap != NULL && TICKS_DIFF(heap->expiry_ms, ticks_ms) <= 0) {
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soft_timer_entry_t *entry = heap;
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heap = (soft_timer_entry_t *)mp_pairheap_pop(soft_timer_lt, &heap->pairheap);
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mp_sched_schedule(entry->callback, MP_OBJ_FROM_PTR(entry));
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if (entry->mode == SOFT_TIMER_MODE_PERIODIC) {
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entry->expiry_ms += entry->delta_ms;
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heap = (soft_timer_entry_t *)mp_pairheap_push(soft_timer_lt, &heap->pairheap, &entry->pairheap);
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}
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}
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MP_STATE_PORT(soft_timer_heap) = heap;
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if (heap == NULL) {
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// No more timers left, set largest delay possible
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soft_timer_next = uwTick;
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} else {
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// Set soft_timer_next so SysTick calls us back at the correct time
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soft_timer_schedule_systick(heap->expiry_ms);
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}
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}
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void soft_timer_insert(soft_timer_entry_t *entry) {
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mp_pairheap_init_node(soft_timer_lt, &entry->pairheap);
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uint32_t irq_state = raise_irq_pri(IRQ_PRI_PENDSV);
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MP_STATE_PORT(soft_timer_heap) = (soft_timer_entry_t *)mp_pairheap_push(soft_timer_lt, &MP_STATE_PORT(soft_timer_heap)->pairheap, &entry->pairheap);
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if (entry == MP_STATE_PORT(soft_timer_heap)) {
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// This new timer became the earliest one so set soft_timer_next
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soft_timer_schedule_systick(entry->expiry_ms);
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}
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restore_irq_pri(irq_state);
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}
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void soft_timer_remove(soft_timer_entry_t *entry) {
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uint32_t irq_state = raise_irq_pri(IRQ_PRI_PENDSV);
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MP_STATE_PORT(soft_timer_heap) = (soft_timer_entry_t *)mp_pairheap_delete(soft_timer_lt, &MP_STATE_PORT(soft_timer_heap)->pairheap, &entry->pairheap);
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restore_irq_pri(irq_state);
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}
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