displaying to TRDB_LCM

[Altera_Forum]

guys... 

 i want to display something to the TRDB_LCM. i use the DE1 board, Quartus II 9.0 and Nios 9.0. i just wanna ask if the connection between the SDRAM, pixel buffer, and VGA core in the SOPC builder is already correct or not. i attached the connection in SOPC. thanks

[Altera_Forum]

i'm doing my project where i need to read the JPEG file from sd card and then display it to lcd screen TRDB_LCM. i've been able to read the data and decompressed it. so now i have to display them. i use the sdram as the buffer. so i use vga controller core, pixel buffer core, and sdram controller core. i set the memory buffer start address to sdram controller base address.  

 and to test it, i use the code below:   alt_up_pixel_buffer_dev * pixel_buf_dev; // open the Pixel Buffer port //pixel_buf_dev = alt_up_pixel_buffer_open_dev ("/dev/pixel_buffer"); if ( pixel_buf_dev == NULL) alt_printf ("Error: could not open pixel buffer device \n"); else alt_printf ("Opened pixel buffer device \n"); /* Clear and draw a blue box on the screen */ alt_up_pixel_buffer_clear_screen (pixel_buf_dev, 0); volatile int i =0; volatile int j =0; volatile int cnt =0; while(1){  if(cnt==50000){  if(j==200){  j=0;  i+=20;  }  if(i==200)i=0;  //   alt_up_pixel_buffer_clear_screen (pixel_buf_dev, 0);  alt_up_pixel_buffer_draw_box (pixel_buf_dev, j, 10, i, 10, 0xf01F, 0);  j++;  cnt = 0;  }  cnt++; }  but there's nothing displayed on the screen, just all white. i dont know what's wrong. do i have to store the RGB data to sdram first?? are there any other configurations need to be done??     thanks before