Sami Kanderian
On the FRDM-KL25Z, when I declare pins PTA5 and PTD2 as PwmOut pins, they are locked together and can not be independently controlled. It doesn't matter if I change the PWM of PTA5 or PTD2. Whichever one is changed, the other one follows it. The simple code below should keep pin PTD2 at 0% pwm while pin PTA5 should switch between 50% and 0% every 0.5 seconds. Pin PTA5 does alternate between 50% and 0% pwm, but instead of staying at 0% pwm, pin PTD2 follows pin PTA5.
Fork of
frdm_rgbled
by 
Freescale
Diff: main.cpp
- Revision:
- 8:47c89e2ae2e6
- Parent:
- 7:ad8295723268
- Child:
- 9:76be39e5d5ab
--- a/main.cpp Wed Jul 16 10:20:45 2014 +0000
+++ b/main.cpp Fri May 13 19:04:14 2016 +0000
@@ -2,18 +2,48 @@
PwmOut r(LED_RED);
PwmOut g(LED_GREEN);
+PwmOut b(LED_BLUE);
+double rn1;
+double rn2;
+double rn3;
+
+double dt=0.025f;
+double tau=0.125;//0.55
+double gain = 0.2;
+double c0=exp(-dt/tau);
+double c1=1-c0;
+int N=(int)(3*tau/dt);
int main()
{
r.period(0.001f);
g.period(0.001f);
-
+ b.period(0.001f);
+ rn1=0;
+ rn2=0;
+ rn3=0;
+
while (true) {
- for (float i = 0.0f; i < 1.0f ; i += 0.001f) {
- float p = 3 * i;
- r = 1.0f - ((p < 1.0f) ? 1.0f - p : (p > 2.0f) ? p - 2.0f : 0.0f);
- g = 1.0f - ((p < 1.0f) ? p : (p > 2.0f) ? 0.0f : 2.0f - p);
- wait (0.0025f);
+
+
+ rn1=rand()/(float)RAND_MAX;
+ rn2=rand()/(float)RAND_MAX;
+ rn3=rand()/(float)RAND_MAX;
+ rn1=gain*rn1+(1-gain);
+ rn2=gain*rn2+(1-gain);
+ rn3=gain*rn3+(1-gain);
+
+ for(int i=0; i<N; ++i){
+
+ r=c0*r+c1*rn1;
+ g=c0*g+c1*rn2;
+ b=c0*b+c1*rn3;
+
+ wait(dt);
}
+
+
}
+
+
}