56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
#ifndef _SYNC_TIMER_H
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#define _SYNC_TIMER_H
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/**************************************************************************
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* Written by Marcin O'BenY Benka <obeny@obeny.net>
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* Version 1.5 (20100225)
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*
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* NOTE:
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*
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* Timer for main event loop synchronization.
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* sync ticks presents following equotation:
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* sync = fcpu/(SYNC_TIMER_PRESCALER*SYNC_TIMER_PRESCALER_OCR*SYNC_TIMER_COUNT)
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* sync value should give execution each 1/100 of second.
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*
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* IMPORTANT:
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* This library need to set following constants to work:
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* - SYNC_TIMER_COUNT - additional divider for reaching desired sync times
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* - SYNC_TIMER_PRESCALER - value to divide fcpu signal for timer
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* supported values: 1, 8, 32, 64, 128, 256 and 1024
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* - SYNC_TIMER_PRESCALER_OCR - max value for counter
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* - SYNC_TIMER_PRESCALER_EDGE - set it for MCUs that sets
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* edge reaction via CSXX bits.
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**************************************************************************/
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/***************************************************************************
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* INCLUDES
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***************************************************************************/
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#include <avr/interrupt.h>
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#include "global.h"
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/***************************************************************************
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* FUNCTIONS
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***************************************************************************/
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/* tells whether 1/100 of second expired */
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/* -----------------------------------------------------------------------
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RETURN VAL : TRUE if 10ms from previous execution elapsed, FALSE otherwise
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ARGS : NONE
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* ----------------------------------------------------------------------- */
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BOOL sync();
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/* initialization of timer */
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/* -----------------------------------------------------------------------
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RETURN VAL : NONE
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ARGS : NONE
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* ----------------------------------------------------------------------- */
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void initSyncTimer();
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#endif /* _SYNC_TIMER_H */
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/* END */
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