FRDM-K64F Code Share
Basic PWM Control in Digital Port that does not have PWM function. I use the RGB LED on board.
Dependencies: mbed
Revision 0:c7e6fec3dbe9, committed 2014-08-07
- Comitter:
- NghiaJenius
- Date:
- Thu Aug 07 12:20:10 2014 +0000
- Commit message:
- Publish Code;
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
diff -r 000000000000 -r c7e6fec3dbe9 main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Thu Aug 07 12:20:10 2014 +0000
@@ -0,0 +1,44 @@
+#include "mbed.h"
+//Basic PWM Led Control In Digital Port
+
+//DigitalOut RLED(PTB22);
+//DigitalOut GLED(PTE26);
+DigitalOut BLED(PTB21);
+float period=0.01;//Config. Period of PWM
+float t_on;
+float t_off;
+double duty=0; //Duty Cycle (%)
+unsigned int count=0;
+
+int main()
+{
+ BLED=0;
+ //Calculate on and off time
+ t_on= period*duty;
+ t_off= period - t_on;
+
+ while (true)
+ {
+ if(count<=2)//Time between changes in brightness = count*period
+ count++;
+ else
+ {
+ count=0;
+ if(duty<1)
+ duty+=0.01;//Adjust dimming speed
+ else
+ {
+ duty=0;
+ }
+ t_on= period*duty;
+ t_off= period - t_on;
+ }
+ //LED control
+ wait(t_on);
+ BLED=1;
+
+ wait(t_off);
+ BLED=0;
+ }
+
+}
\ No newline at end of file
diff -r 000000000000 -r c7e6fec3dbe9 mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Thu Aug 07 12:20:10 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/6213f644d804 \ No newline at end of file