K64F PwmOut - incorrect timing #2936
Description
Note: This is just a template, so feel free to use/remove the unnecessary things
Description
- Type: Bug
- Priority: Major
Bug
Target
K64F
meed-os sha:
(git log -n1 --oneline)
release 5.1.4
Problem
The PwmOut's on K64F are not behaving correctly. I used the following code
#include "mbed.h"
// Template to check Falling edge and Risign edge interrupts.
void main()
{
PwmOut pwm(D3);
pwm.period(0.5f);
pwm.write(0.5f);
while(1){;}
}which you would expect to create a pwm wave with a period of 0.5s with a duty cycle of 50%. When measured the square wave had a frequency of 10.66ms.
This behavior holds when I increase the period to 1s, instead it goes to 20.33ms.
Solution?
Something is going wrong somewhere in the internal math. Haven't been able to find a solution yet.