Exception System.OutOfMemoryException - CLR_E_OUT_OF_MEMORY (1) ++++ ESP32-D0WD-V3 Flash size 16MB W25Q128_V PSRAM: 8MB

[Balashoffs]

Good day. Thanks for fantastic work. Please help with error.

Library/API/IoT binding
nanoFramework.Graphics

Microsoft Visual Studio Community 2019
Version 16.11.42

.NET nanoFramework extension version
v2019.12.0.151

Target name(s)
ESP32_PSRAM_BLE_GenericGraphic_REV3

Firmware version
1.12.4.38

Device capabilities
ESP32 (ESP32-D0WD-V3 (revision v3.1))
Features WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Flash size 16MB W25Q128_V from WINBOND_NEX (manufacturer 0x239 device 0x16408)
PSRAM: 8MB
Crystal 40MHz
https://aliexpress.ru/item/1005004911604497.html?spm=a2g2w.orderdetail.0.0.838b4aa6n01cRy&sku_id=12000044706910460

Description
Try to work with display Gc9A01
When call
"Bitmap fullScreenBitmap = DisplayControl.FullScreen;"
Has next error:

Hello from and generic graphic drivers!
init size: 20480
DisplayControl.MaximumBufferSize: 20480
DisplayControl.IsFullScreenBufferAvailable: True
DisplayControl.ScreenHeight: 200
DisplayControl.ScreenWidth: 200
++++ Exception System.OutOfMemoryException - CLR_E_OUT_OF_MEMORY (1) ++++
++++ Message:
++++ nanoFramework.UI.Bitmap::.ctor [IP: 0000] ++++
++++ nanoFramework.UI.DisplayControl::get_FullScreen [IP: 0015] ++++
++++ NFApp2.Program::Main [IP: 00a7] ++++
Exception thrown: 'System.OutOfMemoryException' in nanoFramework.Graphics.dll
An unhandled exception of type 'System.OutOfMemoryException' occurred in nanoFramework.Graphics.dll

[alberk8]

Try to initialize the screen with enough memory since you have PSRAM. The example below will allow to create 3 full screen of graphics.

 var ret = DisplayControl.Initialize(
     displaySpiConfig,
     screenConfig,
     (uint)(200 * 200 * 4) * 3);

[Balashoffs]

Thanks, working!!!!

But appeared new problem - text is reverse

[alberk8]

Mirror Image. you need to adjust the Generic Driver. The problem is there are alot of screen out there but not all are equal. Some have the image reversed and some use RGB and yet other use RBG.

[Balashoffs]

need go to source of driver of this display (have examples for Arduino) and look there.

Big thanks!!!!!

[Balashoffs]

How you can explain it
(uint)(200 * 200 * 4) * 3)
200 * 200 - display size
4 - ????
3 - qnt screen for caching?

[alberk8]

One byte each for RGB and one for Alpha. RGB + Alpha = 4; 3 is for if you want to create three full screen image and then display them in quick succession without having to load them from storage. It is up to you, Since our PSRAM build has reserve 1MB for screen Image so there is plenty of space.