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--- raspberrypi:wiringpi:softpwm [2017/01/27 19:43] – created aistis
+++ raspberrypi:wiringpi:softpwm [2017/02/11 13:51] (current) – aistis
@@ Line 1: / Line 1: @@
+Impulso pločio moduliacija (Pulse-width modulation) PWM - skirta jeigu norime
+simuliuoti stiprėjantį arba silpstantį signalą. Tinka LED Šviesumui reguliuoti arba motoro
+sukimosi greitumui reguliuoti
+Kodas žemiau didina intensyvumą nuo 0 iki 100
 <code c>
 #include <wiringPi.h>
@@ Line 5: / Line 10: @@
 int main (void)
 {
-  //wiringPiSetup () ;
   wiringPiSetupGpio();
-  //pinMode(2,OUTPUT);
+  softPwmCreate(2, 0, 100);
-  //digitalWrite(18,LOW);
-  //pinMode (2, PWM_OUTPUT ) ;
-  softPwmCreate(2, 100, 100);
-  //softPwmCreate (21, 0, 1024) ;
   for (int i=0;i<100;i++)
   {
-    //pwmWrite(2, i) ;
     softPwmWrite (2, i);
     delay (20) ;
-    //digitalWrite (21,  LOW) ; delay (500) ;
   }
   return 0 ;
 }
+</code>
+kodas zemiau spaudant q ir w galima reguliuoti intensyvumą
+<code c>
+#include<stdio.h>
+#include <termios.h>            //termios, TCSANOW, ECHO, ICANON
+#include <unistd.h>     //STDIN_FILENO
+#include <wiringPi.h>
+#include <softPwm.h>
+const int pin = 21;
+int main(void){
+    int c;
+    static struct termios oldt, newt;
+    tcgetattr( STDIN_FILENO, &oldt);
+    newt = oldt;
+    newt.c_lflag &= ~(ICANON | ECHO);
+    tcsetattr( STDIN_FILENO, TCSANOW, &newt);
+    wiringPiSetupGpio();
+    pinMode(pin, OUTPUT);
+    softPwmCreate(pin, 0, 100);
+    int p = 0;
+    printf("Press e to exit program\n");
+    printf("press q and w to increase and decrease software pwm\n");
+    while((c=getchar())!= 'e')
+    {
+        if (c == 'q') {
+            p ++;
+            printf("%d  \r",p);
+            softPwmWrite (pin, p);
+        }
+        if (c == 'w') {
+            p --;
+            printf("%d  \r",p);
+            softPwmWrite (pin, p);
+        }
+        delay (20) ;
+    }
+    tcsetattr( STDIN_FILENO, TCSANOW, &oldt);
+    return 0;
+}
 </code>