mirror of
https://github.com/stargieg/bacnet-stack
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126 lines
4.0 KiB
C
126 lines
4.0 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 "hardware.h"
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#include "timer.h"
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#include "debug.h"
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/* counter for the various timers */
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static volatile uint32_t Millisecond_Counter;
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/*************************************************************************
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* Description: Activate the LED
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* Returns: nothing
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* Notes: none
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**************************************************************************/
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static void timer_debug_on(
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void)
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{
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GPIO_WriteBit(GPIOB, GPIO_Pin_13, Bit_SET);
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}
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/*************************************************************************
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* Description: Activate the LED
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* Returns: nothing
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* Notes: none
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**************************************************************************/
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static void timer_debug_off(
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void)
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{
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GPIO_WriteBit(GPIOB, GPIO_Pin_13, Bit_RESET);
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}
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/*************************************************************************
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* Description: Toggle the state of the setup LED
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* Returns: none
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* Notes: none
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*************************************************************************/
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void timer_debug_toggle(
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void)
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{
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static bool state = false;
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if (state) {
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timer_debug_off();
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state = false;
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} else {
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timer_debug_on();
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state = true;
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}
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}
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/*************************************************************************
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* Description: Interrupt Service Routine
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* Returns: nothing
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* Notes: reserved name for ISR handlers
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*************************************************************************/
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void SysTick_Handler(
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void)
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{
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/* increment the tick count */
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Millisecond_Counter++;
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timer_debug_toggle();
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}
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/*************************************************************************
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* Description: returns the current millisecond count
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* Returns: none
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* Notes: none
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*************************************************************************/
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uint32_t timer_milliseconds(
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void)
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{
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return Millisecond_Counter;
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}
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/*************************************************************************
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* Description: Timer setup for 1 millisecond timer
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* Returns: none
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* Notes: peripheral frequency defined in hardware.h
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*************************************************************************/
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void timer_init(
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void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_StructInit(&GPIO_InitStructure);
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/* Configure the Receive LED */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_Init(GPIOB, &GPIO_InitStructure);
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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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