FRDM-K64F Code Share / Mbed 2 deprecated PWM_LED_RGB

Basic PWM Control in Digital Port that does not have PWM function. I use the RGB LED on board.

Dependencies:   mbed

main.cpp@0:c7e6fec3dbe9, 2014-08-07 (annotated)

Committer:
NghiaJenius
Date:
Thu Aug 07 12:20:10 2014 +0000
Revision:
0:c7e6fec3dbe9
Publish Code;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
NghiaJenius 0:c7e6fec3dbe9 1 #include "mbed.h"
NghiaJenius 0:c7e6fec3dbe9 2 //Basic PWM Led Control In Digital Port
NghiaJenius 0:c7e6fec3dbe9 3
NghiaJenius 0:c7e6fec3dbe9 4 //DigitalOut RLED(PTB22);
NghiaJenius 0:c7e6fec3dbe9 5 //DigitalOut GLED(PTE26);
NghiaJenius 0:c7e6fec3dbe9 6 DigitalOut BLED(PTB21);
NghiaJenius 0:c7e6fec3dbe9 7 float period=0.01;//Config. Period of PWM
NghiaJenius 0:c7e6fec3dbe9 8 float t_on;
NghiaJenius 0:c7e6fec3dbe9 9 float t_off;
NghiaJenius 0:c7e6fec3dbe9 10 double duty=0; //Duty Cycle (%)
NghiaJenius 0:c7e6fec3dbe9 11 unsigned int count=0;
NghiaJenius 0:c7e6fec3dbe9 12
NghiaJenius 0:c7e6fec3dbe9 13 int main()
NghiaJenius 0:c7e6fec3dbe9 14 {
NghiaJenius 0:c7e6fec3dbe9 15 BLED=0;
NghiaJenius 0:c7e6fec3dbe9 16 //Calculate on and off time
NghiaJenius 0:c7e6fec3dbe9 17 t_on= period*duty;
NghiaJenius 0:c7e6fec3dbe9 18 t_off= period - t_on;
NghiaJenius 0:c7e6fec3dbe9 19
NghiaJenius 0:c7e6fec3dbe9 20 while (true)
NghiaJenius 0:c7e6fec3dbe9 21 {
NghiaJenius 0:c7e6fec3dbe9 22 if(count<=2)//Time between changes in brightness = count*period
NghiaJenius 0:c7e6fec3dbe9 23 count++;
NghiaJenius 0:c7e6fec3dbe9 24 else
NghiaJenius 0:c7e6fec3dbe9 25 {
NghiaJenius 0:c7e6fec3dbe9 26 count=0;
NghiaJenius 0:c7e6fec3dbe9 27 if(duty<1)
NghiaJenius 0:c7e6fec3dbe9 28 duty+=0.01;//Adjust dimming speed
NghiaJenius 0:c7e6fec3dbe9 29 else
NghiaJenius 0:c7e6fec3dbe9 30 {
NghiaJenius 0:c7e6fec3dbe9 31 duty=0;
NghiaJenius 0:c7e6fec3dbe9 32 }
NghiaJenius 0:c7e6fec3dbe9 33 t_on= period*duty;
NghiaJenius 0:c7e6fec3dbe9 34 t_off= period - t_on;
NghiaJenius 0:c7e6fec3dbe9 35 }
NghiaJenius 0:c7e6fec3dbe9 36 //LED control
NghiaJenius 0:c7e6fec3dbe9 37 wait(t_on);
NghiaJenius 0:c7e6fec3dbe9 38 BLED=1;
NghiaJenius 0:c7e6fec3dbe9 39
NghiaJenius 0:c7e6fec3dbe9 40 wait(t_off);
NghiaJenius 0:c7e6fec3dbe9 41 BLED=0;
NghiaJenius 0:c7e6fec3dbe9 42 }
NghiaJenius 0:c7e6fec3dbe9 43
NghiaJenius 0:c7e6fec3dbe9 44 }