We Keep Coding

How to enable LightningProviders for GPIO?

I am trying to access the GPIO on my custom SBC using Windows 10 IoT Core. I have discovered that I must use LightningProviders to accomplish this . So I tried to follow this guide to use lightning providers properly.
I used very simple code:
if (LightningProvider.IsLightningEnabled)
{
LowLevelDevicesController.DefaultProvider = LightningProvider.GetAggregateProvider();
}
GpioStatus = "Initializing...";
var gpio = GpioController.GetDefault();
if (gpio == null)
{
GpioStatus = "There is no GPIO controller on this device.";
}
else
{
gpio.OpenPin(1).Write(GpioPinValue.High);
GpioStatus = gpio.OpenPin(1).Read().ToString();
}
Where GpioStatus is output text on a UI.
I discovered that if I run the LowLevelDevicesController.DefaultProvider = LightningProvider.GetAggregateProvider(); line outside of the enabled check, it picks up the GPIO controller and lets me detect how many pins I have and read them (All low). However I can't change the DriveMode or write to the pins without error. The error I get just says to Make sure the LightningProviders are enabled.
This brings me back to the guide I linked at the start. It suggests to enable DMAP drivers using the Device Portal for W10IoT or DMAPUtil.exe. I have tried both. In the Device Portal the area where it should be is just blank. And in the command line trying to use the DMAPUtil.exe only returns that dmaputil.exe is not available on this system.
Therefore I am asking if there is any other way to enable the LightningProviders or if there a way to know if they are incompatible with my board?
Thanks!
UPDATE
Also tried using the devcon.exe commands in the W10IoT Command line.
I am able to locate the Direct memory access controller but when i do devcon.exe enable *PNP0200 it says it is enabled but remains disabled when checked with devcon.exe status *PNP0200

Please confirm if you have added the IOT_DMAP_DRIVER feature in your OEMInput.xml, this feature will add the DMAP driver in the image. If IOT_DMAP_DRIVER is removed from the OEMInput.xml, the Default Driver Controller will be blank in device protal, and dmaputil will be not available on Windows IoT Core. Please see the IoT Core feature list.
Update:
You can download the source of Lighting Provider, and then deploy and debug in your custom image.

Playing an HDHomeRun stream on a Tizen.NET Xamarin App

I'm trying to play a HDHomeRun Connect Video source from a url in the following format: http://x.x.x.x:xxxx/auto/v4.1. This video source is an MPEG2 video encoding and AC3 audio encoding.
I've tried using the Samsung Tizen.TV .NET sample with the following source but the video never plays.
_player = new Tizen.Multimedia.Player();
var mediaSource = new Multimedia.MediaUriSource(uri);
_player.SetSource(mediaSource);
var display = new Multimedia.Display(Window.Instance);
_player.Display = display;
await _player.PrepareAsync();
The player state gets stuck in preparing, and the await _player.PrepareAsync() call never finishes. It is worth noting that I'm using the Tizen Samsung TV Emulator. Do I need to transcode the stream from the HDHomeRun to be playable? Are there any other measures I might be missing for the Video to play?

Ultimately, the Display property of the player wasn't being set correctly. The property that worked for me (found from investigating the JuvoPlayer code was this:
var display = new Multimedia.Display(((FormsApplication)Forms.Context).MainWindow);
_player.Display = display;

When you are to develop a Tizen .NET application, please be aware of which UI framework your project is targetted for among 3 different types: Xamarin.Forms, (pure) ElmSharp, and Tizen.NUI.
Unless your project is based on the Tizen.NUI framework, you shouldn't use Tizen.NUI.Window.Instance and types in Tizen.NUI namespace in any case. Instead, you will have to use types of ElmSharp or Xamarin.Forms.Platform.Tizen namespace for platform-specific code in your application.
Since the internal implementation of Xamarin.Forms for Tizen is based on ElmSharp, FormsApplication.MainWindow will return a ElmSharp.Window instance which can be used to instantiate a Tizen.Multimedia.Display object. That's why the code in your answer worked.

Set ring volume programatically on Android phone using Xamarin

The following code works well
AudioManager am = (AudioManager)this.GetSystemService(Context.AudioService);
am.RingerMode = RingerMode.Vibrate;
So after running it the ring volume gets to 0, but I would want to set it to a custom value like for instance "57".
To do this I used the following code:
AudioManager am = (AudioManager)this.GetSystemService(Context.AudioService);
am.SetStreamVolume(Stream.Ring, 57, 0);
After this code runs nothing changed to my ring volume, I expected that it will change to a "57" value.
I am using latest Xamarin libraries on a Android 7.0 version. I need to implement this only for Android.
Is this custom ring volume set a limitation ?
What should this am.SetStreamVolume(Stream.Ring, 57, 0); actually do (if it is not changing the ring volume of the phone).

You could use GetStreamMaxVolume firstly to get the maximum value for a particular stream, then set a proper number smaller than the maximum value.

Can't get IAMBufferNegotiation in my code, but GraphStudioNext shows ALLOCATOR_PROPERTIES

I am using DirectShowLib.net in C# and I am trying to set change my ALLOCATOR_PROPERTIES settings, as I am using a live video source and changes are not "immediately" visible on screen.
When constructing a filter graph in GraphStudioNext the ALLOCATOR_PROPERTIES show for the upstream and the downstream pin, although only after connection.
I'd like to set the ALLOCATOR_PROPERTIES using IAMBufferNegotiation, but when trying to get the interface from my capture filter (AV/C Tape Recorder/Player) I get an E_UNEXPECTED (0x8000ffff) error. Here is the relevant C# code:
DS.IAMBufferNegotiation iamb = (DS.IAMBufferNegotiation)capturePin;
DS.AllocatorProperties allocatorProperties = new DS.AllocatorProperties();
hr = iamb.GetAllocatorProperties(allocatorProperties);
DS.DsError.ThrowExceptionForHR(hr);
When I used the downstream video decoder input pin, I get a System.InvalidCastException as the interface is not supported.
How I can I change the cBuffers value of ALLOCATOR_PROPERTIES?

Changing number of buffers is not going to help you here. The number of buffers are negotiated between filters are are, basically, not to be changed externally, however in your case there is no real buffering in the pipeline: once the video frame is available on the first output pin, then it immediately goes through and reaches video renderer. If you see a delay there, it means that either DV player has internal latency, or it is time stamping frames "late" and video renderer has to wait before presentation. You can troubleshoot the latter case by inserting Smart Tee Filter in between and connecting its Preview output pin downward to the video renderer - if this helps out, then the issue is frame time stamping on the source. Amount of buffers does not cause any presentation lag here.

Set FlashMode on Windows Phone 8 c#

I'm making my first camera app. I'm trying to set the flash mode with this line of code:
camera.SetProperty(KnownCameraPhotoProperties.FlashMode, FlashMode.Auto);
but I get this exception:
ArgumentException: Value does not fall within the expected range
I've also tried to check the availability of the Flash but the result doesn't change
var supportedFlashModes = PhotoCaptureDevice.GetSupportedPropertyValues(CameraSensorLocation.Back, KnownCameraPhotoProperties.FlashMode);
if (supportedFlashModes.ToList().Contains((UInt32)FlashMode.Auto))
{
camera.SetProperty(KnownCameraPhotoProperties.FlashMode, FlashMode.Auto);
}
Any ideas?

You have to use
camera.SetProperty(KnownCameraPhotoProperties.FlashMode, FlashState.Auto);
and it will work. See http://msdn.microsoft.com/en-us/library/windowsphone/develop/jj662940(v=vs.105).aspx for more details.