Diff: main.cpp

Revision:

0:b534566a0c77

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Dec 10 17:38:22 2015 +0000
@@ -0,0 +1,30 @@
+// host terminal LED dimmer control
+#include "mbed.h"
+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);
+}
+}