There is no I2C devices found when running from headed app

[Rinsen]

For details #1

[avaranovich]

I am having a similar issue:

Exception thrown: 'System.IO.FileNotFoundException' in Rinsen.IoT.OneWire.dll
WinRT information: Slave address was not acknowledged.

Even though this line succeeds

 _ds2482_100 = new DS2482_100(new I2cDeviceLocator().GetI2cDevice(address).Result);

so it finds the controller, but fails to communicate with the sensor.

fails on this line

_i2cDevice.Write(new byte[] { FunctionCommand.ONEWIRE_RESET });

The connection is pretty straitforward

[Rinsen]

Where do you have the DS2482-100 I2C to OneWire bridge in that connection?

It is required for this library to work as there is no hardware OneWire support in the Raspberry Pi.

I use this one, http://www.modmypi.com/raspberry-pi/breakout-boards/owfs-1-wire/r-pi-i2c-1-wire-owfs-expansion-module-

[avaranovich]

I overlooked that. Thought the library does something like https://learn.adafruit.com/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing/ds18b20 So to make it work on Windows IoT I need a bridge you referes to.

[Rinsen]

For, at least, this code to work you need a bride like the one I linked there unfortunately.

One way to do it if you don´t want to buy a bridge like that is to use a Arduino as a bridge instead but my code here will not help you with that.

[fabianandres]

I tried to connect a DS18B20 sensor with my r-pi3. I'm using the same i2c-1-wire expansion module from modmypi.com.
But it doesn't work as expected.
It gets some data only one time. If I stopp application and start it again, programm fails at position:
_ds2482_100 = new DS2482_100(new I2cDeviceLocator().GetI2cDevice(address).Result);
I never get a response from this line of code.

Sensor is connected like this:
5v to red cable (vcc)
black one to power gnd
blue one to DQ

My questions: is the wiring correct?
What can cause this issue?

Thank you for any hint.

[Rinsen]

Hi @fabianandres!

Have you made sure that you are disposing the OneWireDeviceHandler in a using block? Or reuse the same instance over and over again. The I2C bus that is used to communicate with DS2482-100 is a very limited resource that needs to be disposed every time if you let go of the instance.

using(var oneWireDeviceHandler = new OneWireDeviceHandler())
{
    foreach (var device in oneWireDeviceHandler.GetDevices<DS18B20>())
    {
        var result = device.GetTemperature();
        // Insert code to log result in some way
    }
}

I have been running a device for months without any issues.

[fabianandres]

Hi,

Thank you for your fast response.

Yes, I enclosed OneWireDeviceHandler in a using block.

Tried also to reuse same instance. This works until I restart application.

I tried to dispose instance after every reading.

if (this.oneWireDeviceHandler == null)

           {

               this.oneWireDeviceHandler = new OneWireDeviceHandler(true, true);

           }

           foreach (var device in oneWireDeviceHandler.OneWireDevices.GetDevices<DS18B20>())

           {

               var result = device.GetTemperature();

               this.tempData.Temperature = result;

               // Insert code to log result in some way

               device.DS2482_100.Dispose();

           }

           this.oneWireDeviceHandler.Dispose();

           this.oneWireDeviceHandler = null;

But the same result here.

After restarting application, it fails on this line: new OneWireDeviceHandler(true, true);

Do you any other idea, whats wrong?

Thank you,

Fabian

Von: Fredrik Rinsén [mailto:notifications@github.com]
Gesendet: Montag, 10. Oktober 2016 22:25
An: Rinsen/OneWire OneWire@noreply.github.com
Cc: fabianandres fabian.andres@morija.net; Comment comment@noreply.github.com
Betreff: Re: [Rinsen/OneWire] There is no I2C devices found when running from headed app (#2)

Hi!

Have you made sure that you are disposing the OneWireDeviceHandler in a using block? Or reuse the same instance over and over again. The I2C bus that is used to communicate with DS2482-100 is a very limited resource that needs to be disposed every time if you let go of the instance.

using(var oneWireDeviceHandler = new OneWireDeviceHandler())
{
foreach (var device in oneWireDeviceHandler.GetDevices())
{
var result = device.GetTemperature();
// Insert code to log result in some way
}
}

I have been running a device for months without any issues.

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[Rinsen]

Could you create a as small as possible repro project in a github repository that I can try with the same problem?

It probably has to do with the project type in some way I think, but it´s strange... And I would like to investigate and try to fix this issue :)

[fabianandres]

Hello,

I created a repository at https://github.com/fabianandres/BrewSentinel

Thank you for your help!

Von: Fredrik Rinsén [mailto:notifications@github.com]
Gesendet: Mittwoch, 12. Oktober 2016 21:30
An: Rinsen/OneWire OneWire@noreply.github.com
Cc: fabianandres fabian.andres@morija.net; Mention mention@noreply.github.com
Betreff: Re: [Rinsen/OneWire] There is no I2C devices found when running from headed app (#2)

Could you create a as small as possible repro project in a github repository that I can try with the same problem?

It probably has to do with the project type in some way I think, but it´s strange... And I would like to investigate and try to fix this issue :)

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[Rinsen]

I think I have found the issue here, I will try to implement it and release a new version with some sample code but I have a lot of other things going on so I cant promise when it will be done but within some days at least.

But the problem is related to how Task<> and IAsyncOperation<> is working in headed and headless apps. For some reason that I can´t understand they differ. The solution in headed apps is to run an IAsyncOperation<> with a method call to .AsTask() to get a "normal" Task<> and things start to work as they do in headless mode. while waiting for a Task<> to complete.

I will post here as soon as it is done so you can test it @fabianandres

[Rinsen]

@fabianandres
I have made a commit today that contains a sample for headed applications and I also have made some changes in the Rinsen.IoT.OneWire project to handle async calls in a way that seems to work.

And in the Headed sample you will see that I never dispose the OneWireHandler as this is for some reason not supported with my current implementation in headed mode. But it still works as it should in headless and there you can dispose it and create a new one if you like to.

I have not updated my nuget package right now but will do some more tests before I do that.

I will also close down this issue when that package is out as the main issue is resolved.

[Rinsen]

I have published a new version to nuget now and will close this issue

https://www.nuget.org/packages/Rinsen.OneWire/0.1.5