Image display

TinyCLR OS
1

If anyone has a working project, that displays a jpg on Fez Bit, please give me the source, because the tutorial doesn’t work for me as always.

2

The code below displays a bitmap image from the projects resources.

using System.Drawing;
using System.Threading;
using GHIElectronics.TinyCLR.Devices.Gpio;
using GHIElectronics.TinyCLR.Devices.Spi;
using GHIElectronics.TinyCLR.Drivers.Sitronix.ST7735;
using GHIElectronics.TinyCLR.Pins;

namespace FEZBitDisplay {
    class Program {
        private static ST7735Controller st7735;
        private const int SCREEN_WIDTH = 160;
        private const int SCREEN_HEIGHT = 128;

        private static void Main() {
            var spi = SpiController.FromName(SC20100.SpiBus.Spi4);
            var gpio = GpioController.GetDefault();

            st7735 = new ST7735Controller(
                spi.GetDevice(ST7735Controller.GetConnectionSettings
                (SpiChipSelectType.Gpio, gpio.OpenPin(SC20100.GpioPin.PD10))), //CS pin.
                gpio.OpenPin(SC20100.GpioPin.PC4), //RS pin.
                gpio.OpenPin(SC20100.GpioPin.PE15) //RESET pin.
            );

            var backlight = gpio.OpenPin(SC20100.GpioPin.PA15);

            backlight.SetDriveMode(GpioPinDriveMode.Output);
            backlight.Write(GpioPinValue.High);

            st7735.SetDataAccessControl(true, true, false, false); //Rotate the screen.
            st7735.SetDrawWindow(0, 0, SCREEN_WIDTH - 1, SCREEN_HEIGHT - 1);
            st7735.Enable();

            // Create flush event
            Graphics.OnFlushEvent += Graphics_OnFlushEvent;

            // Create bitmap buffer
            var screen = Graphics.FromImage(new Bitmap(SCREEN_WIDTH, SCREEN_HEIGHT));

            var image = Resources.GetBitmap(Resources.BitmapResources.Pulse);
            screen.Clear();
            screen.DrawImage(image, 0, 0);
            screen.Flush();
            Thread.Sleep(Timeout.Infinite);

        }
        private static void Graphics_OnFlushEvent(Graphics sender, byte[] data, int x, int y, int width, int height, int originalWidth) {
            st7735.DrawBuffer(data);
        }
    }
}
2 Likes
3

It’s worth noting that the image dimensions may need to be even numbers. See: JPG format is not working but BMP is OK and other useful topics available via forum search.

1 Like