61 lines
979 B
C
61 lines
979 B
C
/*
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*
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*
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*
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include "performance_test.h"
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uint32_t ovfcounter;
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uint16_t const_overhead=0;
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uint16_t int_overhead=0;
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ISR(TIMER1_OVF_vect){
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ovfcounter++;
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}
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void calibrateTimer(void){
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startTimer(1);
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stopTimer();
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const_overhead = TCNT1;
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startTimer(1);
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TCNT1=0xFFFE;
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; ; ; ;
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// asm volatile("NOP\n"::); asm volatile("NOP\n"::);
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stopTimer();
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int_overhead = TCNT1;
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}
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void startTimer(uint8_t granularity){
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TCCR1B = 0; /* stop timer */
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TCNT1 = 0;
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ovfcounter = 0;
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TCCR1A = 0x00;
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TIMSK &= 0xC3;
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TIMSK |= _BV(2); /* enable TOIE1 */
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TCCR1B = granularity & 0x7; /* start timer */
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}
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uint64_t stopTimer(void){
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TCCR1B = 0; /* stop timer */
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uint64_t ret;
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ret = (ovfcounter<<16) | TCNT1;
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ret -= const_overhead;
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ret -= ovfcounter * int_overhead;
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return ret;
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}
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void getOverhead(uint16_t* constoh, uint16_t* intoh){
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*constoh = const_overhead;
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*intoh = int_overhead;
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}
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