How to set FMRadio.Instance.Frequency in c#

Question

0.00/5 (No votes)

See more:

I am developing a Windows Phone 8 application, where i want to change the frequency of FMRadio. If i try to change the frequency with var or double directly, it works good. But if i modify the varible value it gives an error (Value does not fall within the expected range).
I just want to know that why is it gives error even both techniques return same value.
================================================================================

Microsoft.Devices.Radio.FMRadio FMRadio = Microsoft.Devices.Radio.FMRadio.Instance;
      public static Microsoft.Devices.Radio.RadioRegion CurrentRegion = Microsoft.Devices.Radio.RadioRegion.UnitedStates;

private void ChangeRadio_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                var MainFreq = FMRadio.Frequency;
              
               
                if (MainFreq >= 87.5 && MainFreq <= 108)
                {
                    if (MainFreq < 108)
                    {
                        FMRadio.CurrentRegion = CurrentRegion;
                       
                        double ch = 95.1 + 0.1; //generates error
                       // double ch = 95.6; // works good
                        
                        FMRadio.Frequency = ch;
                       
                    }
                    else
                    {
                        FMRadio.CurrentRegion = CurrentRegion;
                        FMRadio.Frequency = 87.5;
                    }
                  
                }
                else
                {
                    MessageBox.Show("Radio is OFF");
                }
            }
            
            catch (ArgumentException ex)
            {
                MessageBox.Show(ex.Message.ToString() + "\n" + ex.HResult);
                
            }
            
            
        }

Posted 21-Feb-15 4:06am

Nick_Carter

Updated 21-Feb-15 4:09am

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Frankie-C · Answer 1 · 2015-02-21T05:35:00

Maybe the problem is due to FM frequency definition in USA as stated in Section 73.201 of the FCC's Rules (see).
In your case it seems that the tuner accepts the base channel frequency, that is odd while the center channel is even. In this case the float sum may lead to a value that is not correct. Try encoding directly 95.2 to check if the problem is the value itself, or try adding a slighty higher value (i.e. 95.1+0.101) ur using integers then casted to floats.
BTW for USA radio region limits should be 88-108MHz (not 87.5-108MHz).