Steve Karg
126 lines
3.6 KiB
C
126 lines
3.6 KiB
C
/**************************************************************************
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*
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* Copyright (C) 2011 Steve Karg <skarg@users.sourceforge.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in 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,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Module Description:
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* Generate a periodic timer tick for use by generic timers in the code.
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*
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*************************************************************************/
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#include <stdbool.h>
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#include <stdint.h>
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#include "bacnet/basic/sys/mstimer.h"
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#include "bacnet/basic/sys/debug.h"
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#include "stm32f4xx.h"
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#include "led.h"
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/* counter for the various timers */
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static volatile unsigned long Millisecond_Counter;
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static volatile struct mstimer_callback_data_t *Callback_Head;
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/**
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* Toggle the state of the debug LED
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*/
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static void timer_debug_toggle(void)
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{
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led_toggle(LED_LD1);
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}
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/**
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* Handles the interrupt from the timer
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*/
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void SysTick_Handler(void)
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{
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struct mstimer_callback_data_t *cb;
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/* increment the tick count */
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Millisecond_Counter++;
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cb = (struct mstimer_callback_data_t *)Callback_Head;
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while (cb) {
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if (mstimer_expired(&cb->timer)) {
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cb->callback();
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if (mstimer_interval(&cb->timer) > 0) {
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mstimer_reset(&cb->timer);
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}
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}
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cb = cb->next;
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}
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timer_debug_toggle();
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}
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/**
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* Returns the continuous milliseconds count, which rolls over
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*
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* @return the current milliseconds count
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*/
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unsigned long mstimer_now(void)
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{
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return Millisecond_Counter;
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}
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/**
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* Configures and enables a repeating callback function
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*
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* @param cb - pointer to a #mstimer_callback_data_t
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* @param callback - pointer to a #timer_callback_function function
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* @param milliseconds - how often to call the function
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*
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* @return true if successfully added and enabled
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*/
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void mstimer_callback(struct mstimer_callback_data_t *new_cb,
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mstimer_callback_function callback,
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unsigned long milliseconds)
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{
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struct mstimer_callback_data_t *cb;
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if (new_cb) {
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new_cb->callback = callback;
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mstimer_set(&new_cb->timer, milliseconds);
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}
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if (Callback_Head) {
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cb = (struct mstimer_callback_data_t *)Callback_Head;
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while (cb) {
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if (!cb->next) {
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cb->next = new_cb;
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break;
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} else {
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cb = cb->next;
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}
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}
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} else {
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Callback_Head = new_cb;
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}
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}
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/**
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* Timer setup for 1 millisecond timer
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*/
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void mstimer_init(void)
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{
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/* Setup SysTick Timer for 1ms interrupts */
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if (SysTick_Config(SystemCoreClock / 1000)) {
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/* Capture error */
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while (1)
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;
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}
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NVIC_EnableIRQ(SysTick_IRQn);
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}
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