Merged from git.drogon.net, SPI driver helpers, C++ wrappers, softPwm, piNes, gertboard, SPI

examples/delayTest.c

@@ -0,0 +1,68 @@
+
+#include <stdio.h>
+#include <unistd.h>
+#include <wiringPi.h>
+
+#include <time.h>
+#include <sys/types.h>
+#include <sys/time.h>
+
+#define	CYCLES	1000
+#define	DELAY	99
+
+int main()
+{
+  int x ;
+  struct timeval t1, t2 ;
+  long long    t ;
+  unsigned int max, min ;
+
+  unsigned int values [CYCLES] ;
+
+  max = 0 ;
+  min = 1000000 ;
+
+  if (wiringPiSetup () == -1)
+    return 1 ;
+
+  piHiPri (10) ;
+  sleep (1) ;
+
+// Baseline test
+
+  gettimeofday (&t1, NULL) ;
+  gettimeofday (&t2, NULL) ;
+
+  t = t2.tv_usec - t1.tv_usec ;
+  printf ("Baseline test: %lld\n", t);
+
+  for (x = 0 ; x < CYCLES ; ++x)
+  {
+    gettimeofday (&t1, NULL) ;
+    delayMicroseconds (DELAY) ;
+    gettimeofday (&t2, NULL) ;
+      
+    t = t2.tv_usec - t1.tv_usec ;
+    if (t > max) max = t ;
+    if (t < min) min = t ;
+    values [x] = t ;
+  }
+
+  printf ("Done: Max: %d, min: %d\n", max, min) ;
+
+  for (x = 0 ; x < CYCLES ; ++x)
+  {
+    printf ("%4d", values [x]) ;
+    if (values [x] > DELAY)
+      printf (".") ;
+    else if (values [x] < DELAY)
+      printf ("-") ;
+    else
+      printf (" ") ;
+    if (((x + 1) % 20) == 0)
+      printf ("\n") ;
+  }
+  printf ("\n") ;
+
+  return 0 ;
+}