Fixed the requirement for -lm

[wiringPi.git] / examples / pwm.c

diff --git a/examples/pwm.c b/examples/pwm.c
index c1fc3317c79912eefab0498dc935fd95c2975e92..816c8322e357db2f56458a1bd4689aa61f75c64f 100644 (file)
--- a/examples/pwm.c
+++ b/examples/pwm.c
@@ -1,7 +1,6 @@
 /*
  * pwm.c:
- *     Test of the software PWM driver. Needs 12 LEDs connected
- *     to the Pi.
+ *     This tests the hardware PWM channel.
  *
  * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
  ***********************************************************************
@@ -23,71 +22,37 @@
  ***********************************************************************
  */
 
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
-
 #include <wiringPi.h>
-#include <softPwm.h>
-
-#define RANGE          100
-#define        NUM_LEDS         12
-
-int ledMap [NUM_LEDS] = { 0, 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13 } ;
 
-int values [NUM_LEDS] = { 0, 17, 32, 50, 67, 85, 100, 85, 67, 50, 32, 17 } ;
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
 
-int main ()
+int main (void)
 {
-  int i, j ;
-  char buf [80] ;
+  int bright ;
 
-  if (wiringPiSetup () == -1)
-  {
-    fprintf (stdout, "oops: %s\n", strerror (errno)) ;
-    return 1 ;
-  }
-
-  for (i = 0 ; i < NUM_LEDS ; ++i)
-  {
-    softPwmCreate (ledMap [i], 0, RANGE) ;
-    printf ("%3d, %3d, %3d\n", i, ledMap [i], values [i]) ;
-  }
+  printf ("Raspberry Pi wiringPi PWM test program\n") ;
 
-  fgets (buf, 80, stdin) ;
+  if (wiringPiSetup () == -1)
+    exit (1) ;
 
-// Bring all up one by one:
+  pinMode (1, PWM_OUTPUT) ;
 
-  for (i = 0 ; i < NUM_LEDS ; ++i)
-    for (j = 0 ; j <= 100 ; ++j)
+  for (;;)
+  {
+    for (bright = 0 ; bright < 1024 ; ++bright)
     {
-      softPwmWrite (ledMap [i], j) ;
-      delay (10) ;
+      pwmWrite (1, bright) ;
+      delay (1) ;
     }
 
-  fgets (buf, 80, stdin) ;
-
-// Down fast
-
-  for (i = 100 ; i > 0 ; --i)
-  {
-    for (j = 0 ; j < NUM_LEDS ; ++j)
-      softPwmWrite (ledMap [j], i) ;
-    delay (10) ;
+    for (bright = 1023 ; bright >= 0 ; --bright)
+    {
+      pwmWrite (1, bright) ;
+      delay (1) ;
+    }
   }
 
-  fgets (buf, 80, stdin) ;
-
-  for (;;)
-  {
-    for (i = 0 ; i < NUM_LEDS ; ++i)
-      softPwmWrite (ledMap [i], values [i]) ;
-
-    delay (50) ;
-
-    i = values [0] ;
-    for (j = 0 ; j < NUM_LEDS - 1 ; ++j)
-      values [j] = values [j + 1] ;
-    values [NUM_LEDS - 1] = i ;
-  }
+  return 0 ;
 }