24 replies to this topic

[ricodued]

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!

Attached Files

•  scrambled.jpg   603.14KB   96 downloads

[MBY]

I am experiencing the exact same problem. Did you ever manage to resolve the issue?

[NicholasSTG]

I am experiencing the exact same problem. Did you ever manage to resolve the issue?

Did you resolve this? I am having the same issue.

[supra]

AdaFruitST7735 lcd = new AdaFruitST7735( Pins.GPIO_PIN_D9, Pins.GPIO_PIN_D7, Pins.GPIO_PIN_D8); lcd.ClearScreen(color: (ushort)Colors.Blue);

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

[NicholasSTG]

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

This seems to be the code I tried already, but I tried anyways and still have the same problem. Did you get this to work?

[supra]

This seems to be the code I tried already, but I tried anyways and still have the same problem. Did you get this to work?

Here is link/ Look for adafruit ST7735Test
ST7735

[NicholasSTG]

Hmmm, that's where I sourced my code originally.

I've just commented out a couple of lines since I don't have an SD card in the screen

public static AdaFruitST7735 tft = new AdaFruitST7735(Pins.GPIO_PIN_D9, Pins.GPIO_PIN_D7, Pins.GPIO_PIN_D8, speedKHz: 40000);

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

            tft.ClearScreen();
            DisplayGradient();

            DisplayCircles();

            tft.ClearScreen();
            DisplayLines();

            // DisplayColorFlow();
        }

There's no change, still all scrambled. The code is running (I've tried breakpoints in the Program.cs class and AdaFruitST7735 class and it is hitting them as it is should) so I'm not sure what's up.

I've checked all the wiring multiple times.

When the program starts the screen goes white and then scrambles. The scrambling occurs when the AdaFruitST7735 class is initiated (in the ClearScreen method).

[supra]

Hmmm, that's where I sourced my code originally.

I've just commented out a couple of lines since I don't have an SD card in the screen

public static AdaFruitST7735 tft = new AdaFruitST7735(Pins.GPIO_PIN_D9, Pins.GPIO_PIN_D7, Pins.GPIO_PIN_D8, speedKHz: 40000);

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

            tft.ClearScreen();
            DisplayGradient();

            DisplayCircles();

            tft.ClearScreen();
            DisplayLines();

            // DisplayColorFlow();
        }

There's no change, still all scrambled. The code is running (I've tried breakpoints in the Program.cs class and AdaFruitST7735 class and it is hitting them as it is should) so I'm not sure what's up.

I've checked all the wiring multiple times.

When the program starts the screen goes white and then scrambles. The scrambling occurs when the AdaFruitST7735 class is initiated (in the ClearScreen method).

When u not using sd card. U have remove it frm parameter speedKHz: 40000.......public static AdaFruitST7735 tft = new AdaFruitST7735(Pins.GPIO_PIN_D9, Pins.GPIO_PIN_D7, Pins.GPIO_PIN_D8);


also comment out procedure event .............ReadPicture

Do u have driver for St7735?

[supra]

St7735 driver
MyDriver

[supra]

Do u followed frm ricodued wiring?

[NicholasSTG]

Thanks for all your help. Your Driver seems to help and seems to be different than the version I got when I downloaded the latest from the netduino library.

I now get a picture, but it seems ... 'skewed'.

For instance

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

            tft.ClearScreen((ushort)AdaFruitST7735.Colors.White);
            // tft.DrawCircle(AdaFruitST7735.Width / 2, AdaFruitST7735.Height / 2, AdaFruitST7735.Width / 4, (ushort)AdaFruitST7735.Colors.Red);
            tft.DrawCircle(50, 50, 10, (ushort)AdaFruitST7735.Colors.Red);
            tft.Refresh();
            /*
            DisplayGradient();
            */
            // DisplayCircles();
            /*
            tft.ClearScreen();
            DisplayLines();
            */
            // DisplayColorFlow();
        }

generates a picture like the following



I've checked the wiring, etc and it all seems to be good. I also downloaded the ExtededSpiConfiguration class from the same revision as your code, just in case it was that.

It didn't make a change.

[NicholasSTG]

I also downloaded that entire commit from codeplex and it did not make a change.

[supra]

Thanks for all your help. Your Driver seems to help and seems to be different than the version I got when I downloaded the latest from the netduino library.

I now get a picture, but it seems ... 'skewed'.

For instance

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

            tft.ClearScreen((ushort)AdaFruitST7735.Colors.White);
            // tft.DrawCircle(AdaFruitST7735.Width / 2, AdaFruitST7735.Height / 2, AdaFruitST7735.Width / 4, (ushort)AdaFruitST7735.Colors.Red);
            tft.DrawCircle(50, 50, 10, (ushort)AdaFruitST7735.Colors.Red);
            tft.Refresh();
            /*
            DisplayGradient();
            */
            // DisplayCircles();
            /*
            tft.ClearScreen();
            DisplayLines();
            */
            // DisplayColorFlow();
        }

generates a picture like the following



I've checked the wiring, etc and it all seems to be good. I also downloaded the ExtededSpiConfiguration class from the same revision as your code, just in case it was that.

It didn't make a change.

Did u get error?

[NicholasSTG]

I'm guessing you did not have this issue with the skewing?

[supra]

Does ur circle changed direction?

[NicholasSTG]

Does ur circle changed direction?

The circles do animate when I use the appropriate method, yes.

IT almost seems as if 0,0 is in the wrong spot which throws off all of the other calculations.

[supra]

The circles do animate when I use the appropriate method, yes.

IT almost seems as if 0,0 is in the wrong spot which throws off all of the other calculations.

What abt drawline? Did u try it?

[NicholasSTG]

What abt drawline? Did u try it?

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.

 2012-09-28 15.05.12.jpg   83.9KB   29 downloads

[NicholasSTG]

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.

[supra]

Congratulation nicholasSTG! This sample will only showing u if lcd working. U now ready to create ur own code. Btw, u can try triangle, box, or draw a car, etc