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Messages - Turby

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1
Thanks for the tips on font sizes 32 to 34, not sure how I missed that - these larger sizes are very useful.

Regards limit of 255 font size in EAB, this size is very close to what I need, so will make do with it, though I'm sure others would find it useful to be able to go larger particularly when converting symbol based fonts. Would it be possible to also extend EAB by having the option to specify font size by pixel height as well ?

Kind regards
Toby

2
Thanks for the tips Rudolph,

I have managed to load several compressed ASTC 5x5 images into flash, each of which contain a number of "stacked" images. I can then display any these stacked images directly from flash just like a font. I have also managed to load a small PNG file from SD card to RAM_G (using EVE_cmd_loadimage) , though even a single 224 x 224 png comes out at 100KB which limits its effectiveness. I'm wondering if I can use flash with EVE_cmd_loadimage.

I'm working on a 7" 1024x600 display and have found that the largest font 31 is quite small, is there a way to display zoomed font bitmaps using the inbuilt fonts ?

I notice that the largest font that EVE Asset Builder can convert is limited to a size of 255, which come out at "only" 190 pixels high. Is this a feature of EAB ?

3
Hi,

I'm working on a embedded system using a Teensy 4.1 with SD Card, and Riverdi 7" 1024x600 EVE4 BT817 display with 512Mb flash chip. I'm also using the excellent EVE library from Rudolph.

The idea is to place a standard JPG or PNG file on to the SD card with a known name eg boot.jpg and this is displayed at startup.

When the power is applied the SD card is scanned for the file boot.jpg and then the image is transferred from SD Card to the EVE flash, and then removed from the SD card.

The next time the power is cycled the boot image is displayed from flash.

So my questions are:
1.Is this actually possible with large 1024x600 jpg / png images
2. How do I transfer the file boot.jpg from SD card to Image flash using the Rudolph library ? I Assume I need to do this in chunks
3. Do I need to convert image into ASTC format or can I leave as native JPG / PNG ?
4. Lastly how do I display image directly from flash using the Rudolph library ?

For info, my test app using the Rudolph library is working perfectly so far on the Teensy 4.1 using DMA and have got my ASTC 5x5 icon font working well.

Hopefully someone (like Rudolph) and point me in the right direction!






4
Discussion - EVE / Non square pixel support BT817/818 using HSF
« on: April 06, 2021, 10:49:26 AM »
Hi,

I'm looking to purchase a 7" display with the new Eve4 BT817 controller. I am migrating an existing application which uses a 5" display which has square pixels. From reading 7" TFT datasheets I see that pretty much all of them have non-square pixels. For example the 7" 1024x600 Riverdi RVT70HSBFWN00 has a pixel size of 0.1506 (width) × 0.1432 (height).

The main reason why I want this is to display round circles, not ellipses, it also makes any math for coordinates easier.

I've searched the various datasheets but not finding much in the way of how to use Horizontal Scanout Filter. Even how its actually set (see https://brtchip.com/wp-content/uploads/Support/Documentation/Datasheets/ICs/EVE/DS_BT817_8.pdf)

If I were to keep 1024 x 600 and set HSF to get square pixels, would I then see an unused region on the right hand edge of the display? If so, could I then increase the resolution to (for example) 1060 x 600 to use the entire width of the display?

Is there an example of this being used I could look at?

As an aside does the Eve Screen Builder / Design software (or any other similar tools) take HSF into consideration?

Many thanks
Toby

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