106 lines
2.2 KiB
C
106 lines
2.2 KiB
C
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/*
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* speed.c:
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* Simple program to measure the speed of the various GPIO
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* access mechanisms.
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*/
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#include <wiringPi.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#define FAST_COUNT 10000000
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#define SLOW_COUNT 1000000
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int main (void)
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{
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int i ;
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uint32_t start, end, count, sum, perSec ;
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printf ("Raspberry Pi wiringPi speed test program\n") ;
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// Start the standard way
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if (wiringPiSetup () == -1)
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exit (1) ;
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printf ("Native wiringPi method: (%8d iterations)\n", FAST_COUNT) ;
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pinMode (0, OUTPUT) ;
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sum = 0 ;
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for (i = 0 ; i < 3 ; ++i)
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{
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printf (" Pass: %d: ", i) ;
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fflush (stdout) ;
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start = millis () ;
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for (count = 0 ; count < FAST_COUNT ; ++count)
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digitalWrite (0, 1) ;
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end = millis () ;
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printf (" %8dmS\n", end - start) ;
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sum += (end - start) ;
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}
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digitalWrite (0, 0) ;
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printf (" Average: %8dmS", sum / 3) ;
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perSec = (int)(double)FAST_COUNT / (double)((double)sum / 3.0) * 1000.0 ;
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printf (": %6d/sec\n", perSec) ;
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printf ("Native GPIO method: (%8d iterations)\n", FAST_COUNT) ;
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if (wiringPiSetupGpio () == -1)
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exit (1) ;
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pinMode (17, OUTPUT) ;
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sum = 0 ;
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for (i = 0 ; i < 3 ; ++i)
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{
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printf (" Pass: %d: ", i) ;
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fflush (stdout) ;
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start = millis () ;
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for (count = 0 ; count < 10000000 ; ++count)
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digitalWrite (17, 1) ;
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end = millis () ;
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printf (" %8dmS\n", end - start) ;
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sum += (end - start) ;
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}
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digitalWrite (17, 0) ;
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printf (" Average: %8dmS", sum / 3) ;
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perSec = (int)(double)FAST_COUNT / (double)((double)sum / 3.0) * 1000.0 ;
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printf (": %6d/sec\n", perSec) ;
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// Switch to SYS mode:
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if (wiringPiSetupSys () == -1)
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exit (1) ;
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printf ("/sys/class/gpio method: (%8d iterations)\n", SLOW_COUNT) ;
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sum = 0 ;
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for (i = 0 ; i < 3 ; ++i)
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{
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printf (" Pass: %d: ", i) ;
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fflush (stdout) ;
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start = millis () ;
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for (count = 0 ; count < SLOW_COUNT ; ++count)
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digitalWrite (17, 1) ;
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end = millis () ;
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printf (" %8dmS\n", end - start) ;
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sum += (end - start) ;
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}
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digitalWrite (17, 0) ;
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printf (" Average: %8dmS", sum / 3) ;
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perSec = (int)(double)SLOW_COUNT / (double)((double)sum / 3.0) * 1000.0 ;
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printf (": %6d/sec\n", perSec) ;
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return 0 ;
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}
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