ILi9341 on Raspberry Pi 4

[alberk8]

Describe the bug

I am trying out the code snippet on the Readme and could not get it to compile.

Steps to reproduce

// put sample code here

Expected behavior
Expect it to run on Raspberry Pi 4.

Actual behavior

Versions used
dotnet 6.0 SDK
Latest Nuget

[Ellerbach]

@alberk8 have you tried the sample itself?

https://github.com/dotnet/iot/blob/74f56fae18917dd20379254e76dc21ae1c69e52c/src/devices/Ili934x/samples/Program.cs

All compiles otherwise, we can't merge! So I'll be surprised if it's broken. Maybe the readme is not up to date indeed

[alberk8]

@Ellerbach,

I managed to get the TFT screen to light up and working but I have this issue with the link that you have provided. The line causing the issue this. Otherwise the FillRect works.

Unhandled exception. System.InvalidOperationException: No image factory registered. Call BitmapImage.RegisterImageFactory() with a suitable implementation first. Consult the documentation for further information
   at Iot.Device.Graphics.BitmapImage.VerifyFactoryAvailable()
   at Iot.Device.Graphics.BitmapImage.CreateBitmap(Int32 width, Int32 height, PixelFormat pixelFormat)
   at Iot.Device.Ili934x.Ili9341.GetBackBufferCompatibleImage()

Btw, I cannot see where I can DrawText on the Screen. Is it supposed to be via SkiaSharp? But sadly there is no native SkiaSharp library on the ARM64.

[Ellerbach]

@pgrawehr you may want to have a look at this one

[pgrawehr]

I'm quite sure I have tested this (and it would be really bad if SkiaSharp wouldn't work on the RPI). I'll give it another try as soon as possible.

Make sure you call SkiaSharpAdapter.Register() at the beginning of your application, that should fix the above exception.

[krwq]

@pgrawehr seems https://github.com/dotnet/iot/blob/74f56fae18917dd20379254e76dc21ae1c69e52c/src/devices/Ili934x/samples/Program.cs has the Register but README.md doesn't

[pgrawehr]

I've verified the binding with the sample under /samples/M5StackRemoteDisplay once again on Windows and on my Raspberry Pi 4 (arm64). Both are working just fine.