[SOLVED] ST7565P COG LCD setPixel not working

[abilashjoseph]

hi,

I have a COG LCD with part number ''NHD-C12864A1Z-FSB-FBW-HTT" and SPI interface with driver ST7565P. I displayed images and characters by page control.

My problem is i cant set single pixel in the display. that is first i set one pixel in (x,y) position after that i tried to set in (x1,y1).
at that time the (x,y) pixel is shifted to (x,y1). and (x.y) position is cleared .

any one know what is the issue. any commands error or my code error.

am using 0x40|line_address for controlling line.

Thanks in advance

Abilash Joseph

 

[KlausST]

Hi,

don´t you think it´s a good idea to show your code? ...including display setup routine.

Klaus

 

[Easyrider83]

Anyway, you should not use pixel by pixed drawing. All display drivers realising two simple functions - define the window and put the data. Same in linux framebuffer, same everywhere.

 

[abilashjoseph]

hi all,

Thanks for the replay. I can display the images and characters using pages. its working.

my requirement is to write a function to draw lines, rectangles, circles in the display.

The code for LCD initialization is given below

void init_lcd()
    {
        
      SPI1_send_cmd(0xA0); //RAM address segment
      SPI1_send_cmd(0xAE); // Display OFF
      SPI1_send_cmd(0xC0);  //COM output scan direction
      SPI1_send_cmd(0xA3);  //1/7 Bias
      SPI1_send_cmd(0x2C);
      DelayMs(50);
      SPI1_send_cmd(0x2E);
      DelayMs(50);
      SPI1_send_cmd(0x2F); 
      DelayMs(50);
      SPI1_send_cmd(0x26); // set built-in resistor ratio
      SPI1_send_cmd(0x81); 
      SPI1_send_cmd(0x08); 
      SPI1_send_cmd(0xA6); // Display normal (0xA6) or reverse (0xA7)
      SPI1_send_cmd(0xAF);   //on/off
    }

The code for set pixel is given below

void putPixel(int x1, int y1)
    {
    SPI1_send_cmd(0xB0);
    writeaddress(x1,0x40|y1);
    SPI1_send_data(0x01);
      
    }

 void writeaddress(unsigned char addressX, unsigned char addressY)
{
	 SPI1_send_cmd(addressY); 
     SPI1_send_cmd(0x10|addressX>>4); 
     SPI1_send_cmd(0x0F&addressX);     
}

Regards
Abilash

 

[abilashjoseph]

hi all,

Thanks for the support, its working with circles,rectangles and lines.


regards
abilash