displaying pics from sd card on 2,8" tft slow??

by macnl on Sun Feb 03, 2013 5:10 pm

Hello,

I received the adafruit 2,8" tft breakout board.
And its working fine...
I wanted to store the pics on sd (to spare space on the arduino processor)
And this works fine too...
http://www.ladyada.net/products/tfttouchbreakout/

but its pretty slow to load.
I think its because of the sd card.
In the manual it says that you need to install a faster SD lib.
I did but it takes 3,8 second to display a full display picture.
Is this normal?? or are there posibility/s to load the display faster.
macnl
 
Posts: 1
Joined: Sat Dec 08, 2012 5:28 pm

Re: displaying pics from sd card on 2,8" tft slow??

by adafruit_support_bill on Mon Feb 04, 2013 7:07 am

That is normal. These are not particularly fast displays, and the Arduino has very limited RAM for buffering.
User avatar
adafruit_support_bill
 
Posts: 25545
Joined: Sat Feb 07, 2009 9:11 am

Re: displaying pics from sd card on 2,8" tft slow??

by Nevaargh on Mon Feb 04, 2013 3:47 pm

I'm not great at this, but I had been experimenting with loading a bitmap array into flash with progmen, with mixed success. Do you read from the card every time or cache into a local buffer and reference that? Large / fullscreen images?
Nevaargh
 
Posts: 7
Joined: Sat Jan 26, 2013 2:20 pm