Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Elmryn]

Hello,

I am new to working with an BT815 and consitently experience display artifacts when trying to display text in a custom font in a specific way. The font works properly as long as I only use a single font. As soon as multiple fonts are overlapping it starts flickering and displaying the artifacts.

I load the fonts from flash(glyphs in flash, xfont in ram_g) and set them with the EVE_CMD_SETFONT2 command.
All of the fonts are ~800KB in total right now(might be even more in the future), but still working on and finding new ways to make this less.

Since the code I use in the actual application is quite complex, I produced a minimal version of this, where this issue is still coming up:

Code: [Select]

    EVE_LIB_BeginCoProList();
    EVE_CMD_DLSTART();
    EVE_CLEAR_COLOR_RGB(0, 0, 0);
    EVE_CLEAR(1, 1, 1);
    EVE_VERTEX_FORMAT(0);

    EVE_CMD_TEXT(0, 0, NUNITO_SANS_32, 0, "Lorem ipsum dolor sit amet\n consectetur adipiscing elit. \nCras et lorem eget eros lacinia placerat.");
    EVE_CMD_TEXT(0, 0, NUNITO_SANS_24, 0, "Lorem ipsum dolor sit amet\n consectetur adipiscing elit. \nCras et lorem eget eros lacinia placerat.");
    EVE_CMD_TEXT(0, 0, NUNITO_SANS_32, 0, "Lorem ipsum dolor sit amet\n consectetur adipiscing elit. \nCras et lorem eget eros lacinia placerat.");
    EVE_CMD_TEXT(0, 0, NUNITO_SANS_24, 0, "Lorem ipsum dolor sit amet\n consectetur adipiscing elit. \nCras et lorem eget eros lacinia placerat.");

    EVE_DISPLAY();
    EVE_CMD_SWAP();
    EVE_LIB_EndCoProList();
    EVE_LIB_AwaitCoProEmpty();

But this is working

Code: [Select]

    EVE_LIB_BeginCoProList();
    EVE_CMD_DLSTART();
    EVE_CLEAR_COLOR_RGB(0, 0, 0);
    EVE_CLEAR(1, 1, 1);
    EVE_VERTEX_FORMAT(0);

    EVE_CMD_TEXT(0, 0, NUNITO_SANS_32, 0, "Lorem ipsum dolor sit amet\n consectetur adipiscing elit. \nCras et lorem eget eros lacinia placerat.");
    EVE_CMD_TEXT(0, 100, NUNITO_SANS_24, 0, "Lorem ipsum dolor sit amet\n consectetur adipiscing elit. \nCras et lorem eget eros lacinia placerat.");
    EVE_CMD_TEXT(0, 200, NUNITO_SANS_32, 0, "Lorem ipsum dolor sit amet\n consectetur adipiscing elit. \nCras et lorem eget eros lacinia placerat.");
    EVE_CMD_TEXT(0, 300, NUNITO_SANS_24, 0, "Lorem ipsum dolor sit amet\n consectetur adipiscing elit. \nCras et lorem eget eros lacinia placerat.");

    EVE_DISPLAY();
    EVE_CMD_SWAP();
    EVE_LIB_EndCoProList();
    EVE_LIB_AwaitCoProEmpty();

I found a Problem in the forum, which sounds like the problem I have, so the bandwidth could be the issue here(but the font loaded in that topic is way bigger, only a single font and the topic seemed stale - with a warning to post there):
http://www.brtcommunity.com/index.php?topic=298.0

The solutions over there did not work for me or are not feasible, more details to me trying out the solutions:
- turning on adaptive frame rate did not do anything, the display does not support it
- adaptive HSync is sadly not available on BT815
- loading the font from RAM_G -> I would like to avoid it, because I need to load a couple of fonts, which will use up too much space, because I also need a broad spectrum of characters for different languages and there are already icons in RAM_G to avoid this problem when loading icons/image.
- flash IC is already in FULL state
- switching to BT817 is not possible right now, too many devices to replace

I am very thankfull for ideas on how to handle this issue and maybe someone can verify this problem for me, just in case I was not smart enough to load the font properly or the issue lies somwhere else entirely.

Im still hoping I dont have to work around the issue, but we will see.

Best
Elmryn

[BRT Community]

Hello,

Thank you for your post.

Could I ask what Display settings you are utilising for your LCD panel? and what system clock you have the BT815 running at?

Best Regards,
BRT Community