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Stm32f4 loading image

philip-1992

Hi all,

 

I am still on the experimenting phase of the stm32f4 Discovery. I am trying to load an image on the touch screen (DM-LCD35RT) but I cannot find any examples in order to guide me. Is there anyone that has an available example in which I can understand the process and thus write my own program? Any help would be greatly appreciated. Thank you

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  • 0

    All you have to do, is to write windowfunction for lcd, and you can edit LCD_CLear function to paint picture. I could do that, but i don't have right LCD

    void LCD_SetDisplayWindow(uint8_t Xpos, uint16_t Ypos, uint8_t Height, uint16_t Width)

    {

      if(Xpos >= Height)

      {

        LCD_WriteReg(0x0044, (Xpos - Height +1));

      }

      else

      {

        LCD_WriteReg(0x0044, 0x0000);

      }

      if(Ypos >= Width)

      {

        LCD_WriteReg(0x0045, (Ypos - Width +1));

      } 

      else

      {

        LCD_WriteReg(0x0045, 0x0000);

      }

      LCD_WriteReg(0x0046, Ypos);

      LCD_SetCursor(Xpos, Ypos);

     

    }

     

    And with internal flash, it is possibe to save up to 7 pictures at 320x240 resolution

  • 0 in reply to Kilohercas

    Yes but I still have the 32K size limit of IAR that is the problem. Hopefully by storing the pictures on the SD card it will not exceed the 32K

  • 0 in reply to philip-1992

    no, because you could use 50x50 pictures, not 320x240.
    so you can still develope code under size limit, or go for another trial of compiler, but time, not size limited

     

    Ok, writed simple program, to paint using paint pixel function (you must use paint pixel function with x, y, and colour parameters to make it work, i don't know ST library function name for that)

     

     

    void Slow_paint(int x_start,int y_start,int size_x, int size_y,uint8_t *bitmap)

    {

      uint16_t *bitmap_ptr = (uint16_t *)bitmap;

      int i=0,j=0;

      while(i<size_y)

      {

        while(j<size_x)

        {

         Pixel(j+x_start,i+y_start,*bitmap_ptr++);

          j++;

        }

        i++;

        j=0;

      }

    }

     

    call it like this:
    Slow_paint(10,10,60,60,(u8*)ImageBuffer);

    10 is offset, and 60x60 is my picture size, change to mach your own

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  • 0 in reply to philip-1992

    no, because you could use 50x50 pictures, not 320x240.
    so you can still develope code under size limit, or go for another trial of compiler, but time, not size limited

     

    Ok, writed simple program, to paint using paint pixel function (you must use paint pixel function with x, y, and colour parameters to make it work, i don't know ST library function name for that)

     

     

    void Slow_paint(int x_start,int y_start,int size_x, int size_y,uint8_t *bitmap)

    {

      uint16_t *bitmap_ptr = (uint16_t *)bitmap;

      int i=0,j=0;

      while(i<size_y)

      {

        while(j<size_x)

        {

         Pixel(j+x_start,i+y_start,*bitmap_ptr++);

          j++;

        }

        i++;

        j=0;

      }

    }

     

    call it like this:
    Slow_paint(10,10,60,60,(u8*)ImageBuffer);

    10 is offset, and 60x60 is my picture size, change to mach your own

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