Camera Interface

TinyCLR OS supports digital camera interface, sometimes referred to as DCMI or DCI, on devices using the SITCore SC20260 SoC. Typically, cameras need to be configured using I2C bus. Check the Omnivision/Ov9655 driver under https://github.com/ghi-electronics/TinyCLR-Drivers for an example of how to configure your camera, or refer to the camera's manual to determine the needed configuration.

The following function captures camera images:

public void Capture(byte[] data, int timeoutMillisecond) =>
    this.cameraController.Capture(data, timeoutMillisecond);

This example configures the camera and sends the images to the 4.3 inch display attached to the SCM20260D Dev Board.

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Needed NuGets: GHIElectronics.TinyCLR.Devices.Gpio, GHIElectronics.TinyCLR.Devices.I2c, GHIElectronics.TinyCLR.Drivers.Omnivision.Ov9655, GHIElectronics.TinyCLR.Native, GHIElectronics.TinyCLR.Pins, GHIElectronics.TinyCLR.Devices.Display, GHIElectronics.TinyCLR.Drawing

Needed Namespaces: GHIElectronics.TinyCLR.Devices.Gpio, GHIElectronics.TinyCLR.Devices.I2c, GHIElectronics.TinyCLR.Drivers.Omnivision.Ov9655, GHIElectronics.TinyCLR.Native, GHIElectronics.TinyCLR.Pins, System.Diagnostics, GHIElectronics.TinyCLR.Devices.Display, System.Drawing

GpioPin backlight = GpioController.GetDefault().OpenPin(SC20260.GpioPin.PA15);
backlight.SetDriveMode(GpioPinDriveMode.Output);
backlight.Write(GpioPinValue.High);

var displayController = Display.DisplayController.GetDefault();

var controllerSetting = 
    new ParallelDisplayControllerSettings {
    Width = 480,
    Height = 272,
    DataFormat = DisplayDataFormat.Rgb565,
    Orientation = DisplayOrientation.Degrees0, //Rotate display.
    PixelClockRate = 10000000,
    PixelPolarity = false,
    DataEnablePolarity = false,
    DataEnableIsFixed = false,
    HorizontalFrontPorch = 2,
    HorizontalBackPorch = 2,
    HorizontalSyncPulseWidth = 41,
    HorizontalSyncPolarity = false,
    VerticalFrontPorch = 2,
    VerticalBackPorch = 2,
    VerticalSyncPulseWidth = 10,
    VerticalSyncPolarity = false,
};

displayController.SetConfiguration(controllerSetting);
displayController.Enable();

var screen = Graphics.FromHdc(displayController.Hdc);
var controller = I2cController.FromName(SC20260.I2cBus.I2c1);

// Camera
var ov9655 = new Ov9655Controller(controller);
ov9655.FrameReceived += Ov9655_FrameReceived;
var id = ov9655.ReadId();

Debug.WriteLine("id = " + id);

ov9655.SetResolution(Ov9655Controller.Resolution.Vga);

byte temp = 0;

while (true) {
    try {
        ov9655.Capture();		
    }
    catch (System.Exception) { 
    }
	
	Thread.Sleep(10);
}

private static void Ov9655_FrameReceived(byte[] data, int size) {
	// 480 is screen width
	// 272 is screen height
	// 640 is original image width with VGA = 640
	displayController.DrawBuffer(0, 0, 0, 0, 480, 272, 640, data, 0);
}

Table of Contents

Camera Interface

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