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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

IS it Possible to display bmp image read from SDRAM

Can any one tell us pls. I am using DE0 board. Reading bmp image from SDCARD display it on VGA instead of SRAM buffer i m using SDRAM. is it possible to display the bmp image.
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

hi. i am trying to save a bitmap image to sram from sd card through sopc builder and nios2. my problem is i'm not sure if i can directly use alt_up_sd_card_read to read the file because it is a bitmap image. are they the same with reading text file?

and about this:

--- Quote Start ---

for(i=0;i<280;i++){for(j=40;j<320;j++)

{

byte_b=(unsigned char)(alt_up_sd_card_read(sd_fileh));

byte_g=(unsigned char)(alt_up_sd_card_read(sd_fileh));

byte_r=(unsigned char)(alt_up_sd_card_read(sd_fileh));

pixel=((byte_r>>3)<<11)|((byte_g>>2)<<5)|((byte_b>>3)<<0);

IOWR_16DIRECT(SDRAM_BASE,(((i+80)*640+(j))-40),pixel);

}

--- Quote End ---

can you explain this to me please? this is wrting to pixel memory, right? but how did you come up with this?