11-15-2011 05:52 AM
Hello everybody,
i've got a short question:
Is it possible to change the PWM frequency of the PWM pins out of labview? Or can I change the frequencies with an command in the LVIFA_base.pde (similar as described here:http://www.arduino.cc/playground/Main/TimerPWMCheatsheet )?
If it is possible. How can I do it.
11-17-2011 07:21 AM
After playing around I found that it's possible to include the commands from http://www.arduino.cc/playground/Main/TimerPWMCheatsheet in LVIFA_base.pde . I placed them in the void setup() part under // Place your custom setup code here . Until now I don't receive timing problems, but I don't know whether there is a function in the arduino labview toolkit, that uses millis or delay on the arduino.
I am still interested in a way to set the PWM frequency out of labview.
11-21-2011 02:12 PM
arzt2283,
You can use the same command but inside the case struture in the LabVIEWInterface.pde file. Then make a corresponding VI to call in LabVIEW. Check out how the digital write VI and firmware work for a simple example.
-Sam K
LIFA Developer
10-16-2014 09:41 AM
Hi Sammy_K,
Your last comment was really useful. By modifying the LabVIEWInterface.pde code it is possible to integrate the PWM frequency modification, so the frequency can be controlled directly from Labview. (http://forum.arduino.cc/index.php/topic,117425.0.html)
Regards Valentin
02-28-2016 09:47 PM
can you show your code and block?
03-02-2016 03:08 PM
First you have to add PWM library (first file). Check if its working (second file).
The third file is the modified LIFA_Base. If you open it on LIFA_Base page #include <PWM.h> and InitTimersSafe(); was added.
On page LabVIEWInterface #include <PWM.h> and at Low Level - PWM Commands:
if (command[2]==7)
{
SetPinFrequencySafe(command[2], command[3]); // this has to be called back for freq modulation
analogWrite(command[2],170);
}
else
{
analogWrite(command[2], command[3]);
}
If you call pin 7, the duty cycle value will define the frequency, duty cycle set to 170.
The fourth file is the VI.
Br, Valentin
07-04-2018 06:21 AM
can you elaborate more on how to set prescalar setting to 31khz
i tried it this way in vi , but i was not able to get a output from arduino nano