Diff: main.cpp

Revision:

5:3dcf87833bbb

Parent:

4:a3ec775f889b

--- a/main.cpp	Thu Dec 10 16:46:10 2015 +0000
+++ b/main.cpp	Thu Dec 10 17:42:33 2015 +0000
@@ -1,15 +1,28 @@
+// host terminal LED dimmer control
 #include "mbed.h"
-#define INPUT_SCALAR (0.01f) 
-AnalogIn Ain(p20); 
-    AnalogOut Aout(p18);
-    float i;
-    float pi=3.14159;
-    int main()
-    {
-         while(1) {
-              for (i=0; i<2; i=i+0.005) {
-                  Aout=0.5+0.5*sin(i*pi);
-                  wait(Ain*INPUT_SCALAR);
-                  }
-                  }
-                  }
\ No newline at end of file
+Serial pc(USBTX, USBRX); // tx, rx
+PwmOut PWM1(p21);
+float brightness=0.0;
+int main() {
+PWM1.period(0.010); // set PWM period to 10 ms
+PWM1=0.8; // set duty cycle to 80%
+pc.printf("Control of LED dimmer by host terminal\n\r");
+pc.printf("Press 'u' = brighter, 'd' = dimmer\n\r");
+while(1) {
+char c = pc.getc();
+wait(0.001);
+if((c == 'u') && (brightness < 1.0)) {
+brightness += 0.1;
+PWM1= brightness;
+}
+if((c == 'd') && (brightness > 0.0)) {
+brightness -= 0.1;
+PWM1= brightness;
+}
+if(c == 'x'){
+brightness = 0.5;
+PWM1 = brightness;
+}    
+pc.printf("%c %1.3f \n \r",c,brightness);
+}
+}