24 replies to this topic

[supra]

I've got to trackdown the 'why' but changing the driver's SetPixel to

          private void SetPixel(int x, int y, ushort color) {
            if ((x < 0) || (x >= Width) || (y < 0) || (y >= Height)) return;

            var index = ((y * Width) + x) * sizeof(ushort) - y * 4;    

            if (index < 0 || index >= SpiBuffer.Length) return;
            SpiBuffer[index] = (byte) (color >> 8);
            SpiBuffer[++index] = (byte)(color);
        }

seems to have done the trick. The check on the index is just there because I was debugging.

This tell u specified width and height of lcd. Ur lcd is 160x128.

[lanaya piper]

I did.

I wrote this code to sort of see what was happening

public static void Main() {
            // DisplayPicture();

            tft.ClearScreen((ushort)AdaFruitST7735.Colors.White);
            // DisplayGradient();

            // DisplayCircles();

            for (int x = 0; x < 86; x++ )
            {
                tft.DrawPixel(x, 20, (ushort)AdaFruitST7735.Colors.Red);
            }

            for (int y = 0; y < 10; y++)
            {
                tft.DrawPixel(10, y, (ushort)AdaFruitST7735.Colors.Red);
            }

            for (int x = 0; x < 100; x++)
            {
                tft.DrawPixel(x, 5, (ushort)AdaFruitST7735.Colors.Green);
            }

            tft.DrawLine(50, 50, 50,100,(ushort)AdaFruitST7735.Colors.Blue);

            tft.DrawLine(50, 50, 100,50,(ushort)AdaFruitST7735.Colors.Yellow);

            tft.Refresh();

            // tft.ClearScreen();
            // DisplayLines();

            // DisplayColorFlow();
        }

The result looked like the attachment.

It seems that the 0 point is wrong so when the it tries to calculate a horizontal line the shifts in the register get out of whack.

This is so great! Thanks for sharing! I'm learning a lot from you! You're really a pro!

[Suresh Raj]

I got the lovely adafruit ST7735 LCD screen for Christmas and I'm having troubles with it right out of the box.

It's wired up like so:
Reset -> D8
D/C -> D7
TFT_CS -> D9
MOSI -> D11
SCK -> D13
MISO -> D12

(See the board here.)

When I run the following code:

            AdaFruitST7735 lcd = new AdaFruitST7735(
                Pins.GPIO_PIN_D9,
                Pins.GPIO_PIN_D7,
                Pins.GPIO_PIN_D8);

            lcd.ClearScreen(color: (ushort)Colors.Blue);

My LCD looks as it does in the attached picture.

Any ideas why this isn't working?

Thanks!

Hi Rico/Supra,

I made a custom board with Adafruit 1.8" TFT displau (ST7735) with the following connections

Reset -> PA15
D/C -> PA11
TFT_CS -> PA12
MOSI -> D11
SCK -> D13
MISO -> D12


I am not able to get anything when I map rest, D/C and TFT_CS to the above pins. Can I use these alternate GPIO pins. Please help!

[supra]

Hi Rico/Supra,
I am not able to get anything when I map rest, D/C and TFT_CS to the above pins. Can I use these alternate GPIO pins. Please help!

Sorry for late reply. Btw, I'm using NGo.
There is no way to make thing work if u used alternate GPIO pins.
Double check ur wiring(some not getting signal) probably.

[supra]

@Suresh Raj

here is link:
MyLCD

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