96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
/* performance_test.c */
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/*
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This file is part of the AVR-Crypto-Lib.
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Copyright (C) 2006-2015 Daniel Otte (bg@nerilex.org)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* author: Daniel Otte
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* email: bg@nerilex.org
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* license: GPLv3
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*
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*
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**/
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#include "config.h"
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#include <string.h>
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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 <avr/pgmspace.h>
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#include <stdio.h>
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#include "performance_test.h"
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#ifdef ATMEGA644
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#define TIMSK TIMSK1
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#endif
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static volatile uint32_t ovfcounter;
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static uint16_t const_overhead = 0;
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static 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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asm("nop");
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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 = _BV(TOIE1); /* 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 = (((uint64_t)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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void print_time_P(PGM_P s, uint32_t t){
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printf_P(PSTR("%S%11"PRIu32), t);
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}
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void print_overhead(void){
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printf_P(PSTR("\n=== benchmark ===\n\tconst overhead: %7"PRIu16"\n\tinterrupt overhead: %7"PRIu16"\n"), const_overhead, int_overhead);
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}
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