Kari Argillander
cb243c36a8
* Change MIT license texts to SPDX-License-Identifier SPDX-License-Identifier is much easier to understand and grep than license text so use that instead. * Change GPL exception license texts to SPDX-License-Identifier SPDX-License-Identifier is much easier to understand and grep than license text so use that instead. * Change misc license texts to SPDX-License-Identifier There are some external code in repo which are not licenses as most of the stuff in this repo. We still want every file to have SPDX identifier to easily grep licenses. * Add currently used license files Even though Bacnet-Stack is using SPDX identifiers we still need to give those license files with source. For this reason add all license files to license/ folder. SPDX has also files which would make same thing but this is style which example Linux kernel is using and it is quite clear so I choose that one for now. I choosed not yet bring CC-PDDC as that is not right license for those files. --------- Co-authored-by: Kari Argillander <kari.argillander@fidelix.com>
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/**************************************************************************
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*
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* Copyright (C) 2007 Steve Karg <skarg@users.sourceforge.net>
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*
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* SPDX-License-Identifier: MIT
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*
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*********************************************************************/
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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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/* This module is a 1 millisecond timer */
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/* Prescaling: 1, 8, 64, 256, 1024 */
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#define TIMER_PRESCALER 64
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/* Count: Timer0 counts up to 0xFF and then signals overflow */
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#define TIMER_TICKS (F_CPU / TIMER_PRESCALER / 1000)
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#if (TIMER_TICKS > 0xFF)
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#error Timer Prescaler value is too small
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#endif
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#define TIMER_COUNT (0xFF - TIMER_TICKS)
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/* Global variable millisecond timer - used by main.c for timers task */
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volatile uint8_t Timer_Milliseconds = 0;
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/* MS/TP Silence Timer */
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static volatile uint16_t SilenceTime;
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/* Configure the Timer */
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void Timer_Initialize(void)
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{
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/* Normal Operation */
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TCCR1A = 0;
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/* CSn2 CSn1 CSn0 Description
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---- ---- ---- -----------
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0 0 0 No Clock Source
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0 0 1 No prescaling
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0 1 0 CLKio/8
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0 1 1 CLKio/64
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1 0 0 CLKio/256
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1 0 1 CLKio/1024
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1 1 0 Falling Edge of T0 (external)
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1 1 1 Rising Edge of T0 (external)
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*/
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TCCR0B = _BV(CS01) | _BV(CS00);
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/* Clear any TOV1 Flag set when the timer overflowed */
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BIT_CLEAR(TIFR0, TOV0);
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/* Initial value */
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TCNT0 = TIMER_COUNT;
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/* Enable the overflow interrupt */
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BIT_SET(TIMSK0, TOIE0);
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/* Clear the Power Reduction Timer/Counter0 */
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BIT_CLEAR(PRR, PRTIM0);
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}
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/* Timer interupt */
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/* note: Global interupts must be enabled - sei() */
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/* Timer Overflowed! Increment the time. */
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ISR(TIMER0_OVF_vect)
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{
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/* Set the counter for the next interrupt */
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TCNT0 = TIMER_COUNT;
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/* Overflow Flag is automatically cleared */
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/* Update the global timer */
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if (Timer_Milliseconds < 0xFF)
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Timer_Milliseconds++;
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if (SilenceTime < 0xFFFF)
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SilenceTime++;
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}
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/* Public access to the Silence Timer */
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uint16_t Timer_Silence(void)
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{
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uint16_t timer;
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BIT_CLEAR(TIMSK0, TOIE0);
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timer = SilenceTime;
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BIT_SET(TIMSK0, TOIE0);
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return timer;
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}
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/* Public reset of the Silence Timer */
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void Timer_Silence_Reset(void)
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{
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BIT_CLEAR(TIMSK0, TOIE0);
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SilenceTime = 0;
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BIT_SET(TIMSK0, TOIE0);
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}
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