2.2" 18-bit color TFT LCD display with microSD card breakout

EL Wire/Tape/Panels, LEDs, pixels and strips, LCDs and TFTs, etc products from Adafruit

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shadax
 
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2.2" 18-bit color TFT LCD display with microSD card breakout

Post by shadax »

Hello,

I'm pretty new to the forum.
I'm interested in buying this LCD display for a project.

However I'm wondering how "fast" the display can switch from a bitmap to another.
If I understand well there are two methods of loading the bitmaps in the frame buffers, one is faster than the other one ?

Thanks for any answer,

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adafruit_support_rick
 
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Re: 2.2" 18-bit color TFT LCD display with microSD card brea

Post by adafruit_support_rick »

shadax wrote:However I'm wondering how "fast" the display can switch from a bitmap to another.
If I understand well there are two methods of loading the bitmaps in the frame buffers, one is faster than the other one ?
I don't have an exact benchmark. but it takes a few seconds to load a new bitmap image. How fast do you need it to be?

shadax
 
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Joined: Tue Oct 15, 2013 4:40 am

Re: 2.2" 18-bit color TFT LCD display with microSD card brea

Post by shadax »

The fastest possible ^_^

In the ancients times, we would preload (or render) the second image in the memory (frame buffer) then telling the graphic card to display the new image. The frame switching was synchronized with the vertical sync of the screen to avoid flickering.

Since the LCD seems to have a frame buffer maybe the same trick would be possible ?

I see that the DDRAM seems to be only 172Kbytes so I might be daydreaming...

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adafruit_support_rick
 
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Re: 2.2" 18-bit color TFT LCD display with microSD card brea

Post by adafruit_support_rick »

Just tried it. A full bitmap takes 3.9 seconds to load on a Uno, using hardware SPI (i.e., the 'fast' way)

shadax
 
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Re: 2.2" 18-bit color TFT LCD display with microSD card brea

Post by shadax »

Thanks for testing.
I was fearing it would be slow like that with an arduino.

With your experience, would you have a suggestion for get bitmaps loaded in 0,5 sec or less ?

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adafruit_support_rick
 
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Re: 2.2" 18-bit color TFT LCD display with microSD card brea

Post by adafruit_support_rick »

Just tried it with a Due. That takes 2.1 seconds. Maybe a Pi or BBB would get you to 0.5 sec. I don't know.

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