113 lines
4.0 KiB
C
113 lines
4.0 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_head) = NULL;
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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 *head = MP_STATE_PORT(soft_timer_head);
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while (head != NULL && TICKS_DIFF(head->expiry_ms, ticks_ms) <= 0) {
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mp_sched_schedule(head->callback, MP_OBJ_FROM_PTR(head));
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if (head->mode == SOFT_TIMER_MODE_PERIODIC) {
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head->expiry_ms += head->delta_ms;
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// Shift this node along to its new position
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soft_timer_entry_t *cur = head;
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while (cur->next != NULL && TICKS_DIFF(head->expiry_ms, cur->next->expiry_ms) >= 0) {
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cur = cur->next;
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}
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if (cur != head) {
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soft_timer_entry_t *next = head->next;
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head->next = cur->next;
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cur->next = head;
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head = next;
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}
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} else {
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head = head->next;
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}
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}
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MP_STATE_PORT(soft_timer_head) = head;
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if (head == 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(head->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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uint32_t irq_state = raise_irq_pri(IRQ_PRI_PENDSV);
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soft_timer_entry_t **head_ptr = &MP_STATE_PORT(soft_timer_head);
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while (*head_ptr != NULL && TICKS_DIFF(entry->expiry_ms, (*head_ptr)->expiry_ms) >= 0) {
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head_ptr = &(*head_ptr)->next;
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}
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entry->next = *head_ptr;
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*head_ptr = entry;
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if (head_ptr == &MP_STATE_PORT(soft_timer_head)) {
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// This new timer became the earliest one so set soft_timer_next
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soft_timer_schedule_systick((*head_ptr)->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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soft_timer_entry_t **cur = &MP_STATE_PORT(soft_timer_head);
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while (*cur != NULL) {
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if (*cur == entry) {
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*cur = entry->next;
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break;
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}
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}
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restore_irq_pri(irq_state);
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}
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