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Author Topic: About using of RAM_G freely  (Read 7615 times)

EnsAltun

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About using of RAM_G freely
« on: May 10, 2021, 11:20:55 AM »

Hello ,

I am using FT810 and 7" TFT on my project. And sometimes i need a few photos on background. But as you know FT810 has 1024KB RAM_G so new photos and fonts fill RAM_G. Now I am using 540KB(%52 of RAM_G). But is this safe? I mean what happens if i fill up whole RAM_G with photos? Does working of FT810 get slower or does a bug occur on normal operations? I wonder your opinions about this. 
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Re: About using of RAM_G freely
« Reply #1 on: May 10, 2021, 01:51:30 PM »

Hi,

You can use RAM_G without affecting the speed or performance of the chip as the display list is created in RAM_DL which is separate. The amount of RAM_G used wont cause the device to slow down. In some cases, using an image instead of a complex series of shapes may be beneficial as it can save on RAM_DL entries.

If you load compressed images, there is one area (the top 42K bytes) which is used as a scratch area by the decoder and so it is best to avoid this if you expect to use CMD_LOADIMAGE etc. to load PNG images.

Best Regards, FTDI Community


 
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EnsAltun

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Re: About using of RAM_G freely
« Reply #2 on: May 10, 2021, 05:11:05 PM »

Thank you for kindly response.
So except using compressed images, i can use whole RAM_G(1MB) freely and fill up with fonts etc, right?  Because i will load a few fonts with various sizes and want to be sure that it wont be problem for me. 
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Re: About using of RAM_G freely
« Reply #3 on: June 07, 2021, 05:28:35 PM »

Hi,

Yes that's correct, the RAM_G is just for loading assets like fonts and images and the other RAM areas (like RAM_DL, RAM_CMD and RAM_REGISTERS) are all separate areas of the memory map. Therefore the fullness of RAM_G won't cause EVE to slow down or cause it to work incorrectly.

Best Regards, FTDI Community
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