B4J Question PWM on Raspy (Comfile)

[micro]

Hi to all
I'm testing a Comfile product (ComfilePI) with raspy inside and 7" touch dispaly.
this has a buzzer connected to GPIO 30 piloted in PWM
This is an example in C ++, how can I turn it into B4J?

#include <pigpiod_if2.h>
#include <thread>
using namespace std;
#define PIN 30
void play_beep()
{
   auto instance = pigpio_start(NULL, NULL);
   // We actually can't achieve 2700Hz due to the sampling
   // rate, but it will do the best it can
   set_PWM_frequency(instance, PIN, 2700);
   // 128/255 = 50% duty
   set_PWM_dutycycle(instance, PIN, 128);
   // play beep for 100 milliseconds
   this_thread::sleep_for(chrono::milliseconds(100));
   // turn off beep
   set_PWM_dutycycle(instance, PIN, 0);
   pigpio_stop(instance);
}

I never used the pwm function on raspberry
Thanks

 

[inakigarm]

Check https://www.b4x.com/android/forum/pages/results/?query=Pwm+b4j for examples

 

[micro]

I tried
Into AppStart

Dim jo As JavaObject
jo.InitializeStatic("com.pi4j.wiringpi.SoftPwm")
jo.RunMethod("softPwmCreate", Array (30, 0, 2700))
Beep
.......

Into Beep

Public Sub Beep
    Dim jo As JavaObject
    jo.InitializeStatic("com.pi4j.wiringpi.SoftPwm")
    jo.RunMethod("softPwmWrite", Array (30, 50))
    Sleep(500)
    jo.RunMethod("softPwmWrite", Array (30, 0))
End Sub

But not work!
where I am wrong?
Thanks

 

[Erel]

Your code looks correct. Are you sure that you are using the correct pin?

The pin numbers do not match the board numbers.

http://pi4j.com/pin-numbering-scheme.html

 

[micro]

Your code looks correct. Are you sure that you are using the correct pin?

The pin numbers do not match the board numbers.

http://pi4j.com/pin-numbering-scheme.html

so Comfile says (see #1)
Raspberry Pi 3 Compute Module
http://comfilewiki.co.kr/en/doku.php?id=comfilepi:index

 

[Erel]

Start with a simple program that lights a LED with GpioPinDigitalOutput. Does it work?

 

[micro]

Start with a simple program that lights a LED with GpioPinDigitalOutput. Does it work?

Pin30 is internally connected to the buzzer, not accessible to the outside.
Thanks

 

[Erel]

Do you have access to any of the pins? You should start with finding out how Pi4J maps the pins of this device.

 

[micro]

Do you have access to any of the pins? You should start with finding out how Pi4J maps the pins of this device.

Yes with jPi4J i have access to any pins (with the same number pins)

 

[micro]

a slight beep....wrong values?
jo.RunMethod("softPwmCreate", Array (pin, value, range))
PWM_frequency (2700) in range it's correct?
value is the initial value on pin or duty_cycle?
Thanks

 

[Erel]

You can see the methods documentation here: http://pi4j.com/apidocs/com/pi4j/wiringpi/SoftPwm.html