PWM zero gaps !

[ilight]

i tried to generate using setdutycycle and setpulsewidth and i always get zero gaps in it ! 

this is a sample of what i'm doing 

public void setup() throws ConnectionLostException {

try {

pwmOutput1_ = ioio_.openPwmOutput(new DigitalOutput.Spec(11,Mode.OPEN_DRAIN), 1000);

 

pwmOutput2_ = ioio_.openPwmOutput(new DigitalOutput.Spec(12,Mode.OPEN_DRAIN), 1000);

enableUi(true);

} catch (ConnectionLostException e) {

enableUi(false);

throw e;

}

}

public void loop() throws ConnectionLostException {

try {

while(true){

if (OnOff_1.isChecked()) {

pwmOutput1_.setDutyCycle(seeking11.getProgress()/1000.0f);

} else {

pwmOutput1_.setDutyCycle(0);

}

[Ytai Ben-Tsvi]

What do you mean by "zero gaps"?

I see that you're opening the pins in open-drain mode. Do you have pull-ups on them?

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[ilight]

yes i'm using drain mode and pull up and it's giving 5 v and everything is okay and the pulses changes with the duty cycle but there's problem of zeros between the periods that affect the pwm signal , i thought there was a problem in the thread ,but now i modified IOIOsimpleApp a little bit and it gives better response than the earlier thread.

thanks Ytai 

[Ytai Ben-Tsvi]

I'm sorry, I don't understand what do you mean by "zeros between the periods" still.

Can you explain in more detail or attach a diagram?

On Fri, May 10, 2013 at 5:47 PM, ilight <ilight....@gmail.com> wrote:

yes i'm using drain mode and pull up and it's giving 5 v and everything is okay and the pulses changes with the duty cycle but there's problem of zeros between the periods that affect the pwm signal , i thought there was a problem in the thread ,but now i modified IOIOsimpleApp a little bit and it gives better response than the earlier thread.

thanks Ytai 

--

[ilight]

import ioio.lib.api.PwmOutput;

import ioio.lib.api.DigitalOutput;

import ioio.lib.api.DigitalOutput.Spec.Mode;

import ioio.lib.api.exception.ConnectionLostException;

import ioio.lib.util.android.IOIOActivity;

import ioio.lib.util.AbstractIOIOActivity;

import android.os.Bundle;

import android.widget.SeekBar;

import android.widget.ToggleButton;

public class IOIORBG extends AbstractIOIOActivity {

private ToggleButton OnOff_1, OnOff_2, read, relax, party, normal;

private SeekBar seeking11, seeking22;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

seeking11 = (SeekBar) findViewById(R.id.seekBar11);

seeking11.setMax(100);

seeking22 = (SeekBar) findViewById(R.id.seekBar22);

seeking22.setMax(100);

OnOff_1 = (ToggleButton) findViewById(R.id.toggleButton1);

OnOff_2 = (ToggleButton) findViewById(R.id.toggleButton2);

read = (ToggleButton) findViewById(R.id.toggleButton3);

relax = (ToggleButton) findViewById(R.id.toggleButton4);

party = (ToggleButton) findViewById(R.id.toggleButton5);

normal = (ToggleButton) findViewById(R.id.toggleButton6);

        enableUi(false);

    }

class IOIOThread extends AbstractIOIOActivity.IOIOThread {

private PwmOutput pwmOutput1_;

private PwmOutput pwmOutput2_;

public void setup() throws ConnectionLostException {

try {

pwmOutput1_ = ioio_.openPwmOutput(new DigitalOutput.Spec(11,Mode.OPEN_DRAIN), 1000);

 

pwmOutput2_ = ioio_.openPwmOutput(new DigitalOutput.Spec(12,Mode.OPEN_DRAIN), 1000);

enableUi(true);

} catch (ConnectionLostException e) {

enableUi(false);

throw e;

}

}

public void loop() throws ConnectionLostException {

try {

while(true){

if (OnOff_1.isChecked()) {

pwmOutput1_.setDutyCycle(seeking11.getProgress() /100.0f);

} else {

pwmOutput1_.setDutyCycle(0);

}

if (OnOff_2.isChecked()) {

pwmOutput2_.setDutyCycle(seeking22.getProgress() /100.0f);

} else {

pwmOutput2_.setDutyCycle(0);

}

if (read.isChecked()) {

pwmOutput1_.setDutyCycle(0.8f);

pwmOutput2_.setDutyCycle(0.8f);

} else {

pwmOutput1_.setDutyCycle(0);

pwmOutput2_.setDutyCycle(0);

}

if (relax.isChecked()) {

pwmOutput1_.setDutyCycle(0.6f);

pwmOutput2_.setDutyCycle(0.6f);

} else {

pwmOutput1_.setDutyCycle(0);

pwmOutput2_.setDutyCycle(0);

}

if (party.isChecked()) {

pwmOutput1_.setDutyCycle(1);

pwmOutput2_.setDutyCycle(1);

} else {

pwmOutput1_.setDutyCycle(0);

pwmOutput2_.setDutyCycle(0);

}

if (normal.isChecked()) {

pwmOutput1_.setDutyCycle(0.5f);

pwmOutput2_.setDutyCycle(0.5f);

} else {

pwmOutput1_.setDutyCycle(0);

pwmOutput2_.setDutyCycle(0);

}

IOIOThread.sleep(10);}

} catch (InterruptedException e) {

ioio_.disconnect();

} catch (ConnectionLostException e) {

enableUi(false);

throw e;

}

}

}

@Override

protected AbstractIOIOActivity.IOIOThread createIOIOThread() {

return new IOIOThread();

}

private void enableUi(final boolean enable) {

runOnUiThread(new Runnable() {

//@Override

public void run() {

seeking11.setEnabled(enable);

seeking22.setEnabled(enable);

OnOff_1.setEnabled(enable);

OnOff_2.setEnabled(enable);

read.setEnabled(enable);

relax.setEnabled(enable);

party.setEnabled(enable);

normal.setEnabled(enable);

}

});

}

}

[Ytai Ben-Tsvi]

Your code does that...

Imagine for example that "party" is false and "normal" is true. Your loop will first set the PWM to 0, then to 0.5. In general, regardless of what the checkboxes are set to, only "normal" will eventually matter, since you're overriding all the previous settings.

You probably want something like a radio button widget and then your code might look like:

if (sw1.isChecked()) {

  ...

} else if (sw2.isChecked()) {

  ...

} else if (sw3.isChecked()) {

  ...

} else {

  ...

}

}

});

}

}

[ilight]

thanks a lot i will try it.