Lee Nam Cheol / Mbed OS lab02-led-dimmer

using DAC0_OUT to adjust the brightness of a led

Files at this revision

API Documentation at this revision

Revision 1:aa352db03d0c, committed 2020-04-15

Comitter:
namcheol
Date:
Wed Apr 15 07:31:03 2020 +0000
Parent:
0:f31836d48420
Commit message:
lab02-led-dimmer

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/main.cpp	Sun Mar 29 19:41:28 2020 +0000
+++ b/main.cpp	Wed Apr 15 07:31:03 2020 +0000
@@ -1,18 +1,19 @@
 #include "mbed.h"
 
-// https://os.mbed.com/docs/mbed-os/v5.15/tools/creating-a-new-program.html
-
-Serial pc(USBTX, USBRX, 115200);    // baud rate 115200
-DigitalOut led(LED1);               // led = LED1
+AnalogOut led(DAC0_OUT);  //led = DAC0_OUT
 
 int main()
 {
+    float f;
+    
     while (true) {
-        led = 0;
-        printf("LED1 is ON\r\n");
-        thread_sleep_for(500);
-        led = 1;
-        printf("LED1 is OFF\r\n");
-        thread_sleep_for(500);
+        for(f = 0.5; f <= 1.0; f += 0.01){   //led from 50% of brightness to 100%
+            led.write(f);
+            thread_sleep_for(3000/50);
+            }
+        for(f = 1.0; f >= 0.5; f -= 0.01){  //led from 100% to 50%
+            led.write(f);
+            thread_sleep_for(3000/50);
+            }
     }
 }
\ No newline at end of file