BRT Community

So, anything? 

Well, see you at Embedded World in Nürnberg. 
I have my train ticket, I plan to attend on wednesday, might check out your booth around 1pm.

Hi Rudolph,

We have one of those modules available now so will give it a try here and let you know if we can see it happening,

Best Regards, BRT Community

Challenge Date : 12 Jan – 27 Feb 2026

Mission: Create an impactful project on the EVE platform.
Prize: Bridgetek Evaluation Kit +15.6" display + ticket to EW 2026 (10–12 March).
Action: Show us your creativity—bring your ideas to life!

Submit your Project : https://42bmw.share.hsforms.com/2t2Ic1en9SEKxbwRMKdLebg

This issue just came back to me: https://github.com/RudolphRiedel/FT800-FT813/discussions/163

I reduced my display list to this:

EVE_cmd_dlstart();
EVE_clear_color_rgb(WHITE);
EVE_clear(1, 1, 1);
EVE_tag(0);
EVE_color_rgb(BLACK);
EVE_cmd_number(100, EVE_VSIZE - 65, 26, EVE_OPT_RIGHTX, cmd_fifo_size);
EVE_cmd_number(100, EVE_VSIZE - 50, 26, EVE_OPT_RIGHTX, display_list_size);
EVE_cmd_number(104, EVE_VSIZE - 35, 26, EVE_OPT_RIGHTX|6U, num_profile_a);
EVE_cmd_number(104, EVE_VSIZE - 20, 26, EVE_OPT_RIGHTX|6U, num_profile_b)
EVE_display();
EVE_display();
EVE_cmd_swap();

And with EVE_cmd_setrotate(0); the text is fine, with EVE_cmd_setrotate(1); it is barely readable.
With EVE_cmd_setrotate(2); it is fine.

The display settings I am using:
#define EVE_HSIZE (1280L)
#define EVE_VSIZE (800L)
#define EVE_VSYNC0 (0L)
#define EVE_VSYNC1 (10L)
#define EVE_VOFFSET (23L)
#define EVE_VCYCLE (838L)
#define EVE_HSYNC0 (0L)
#define EVE_HSYNC1 (20L)
#define EVE_HOFFSET (88L)
#define EVE_HCYCLE (1440L)
#define EVE_PCLK_FREQ (0x08C1U) /* value to be put into REG_PCLK_FREQ -> 72MHz, REG_PCLK is set to 1 */
#define EVE_SET_REG_PCLK_2X
#define EVE_PCLKPOL (1L)
#define EVE_SWIZZLE (0L)
#define EVE_CSPREAD (0L)
#define EVE_HAS_CRYSTAL
#define EVE_GEN 4
#define EVE_BACKLIGHT_FREQ (4000U)


Is there anything I can do to fix this?

To add a minor detail, FT8xx and BT81x "only" support 32 bitmap handles, so 0 to 31.
15 is used as a scratch bitmap by a couple of commands.

BT82x has 64 bitmap handles and 16 to 34 are assigned to the fonts.
Unfortunately it still uses the same fonts, but at least there are all directly useable.

Hi,

For these fonts, it is required to use CMD_ROMFONT. Please see section 5.70 in the Programming Guide for examples.
https://brtchip.com/wp-content/uploads/2025/07/BRT_AN_033_BT81X-Series-Programming-Guide.pdf

Here we set the font 34 to user handle 1.

cmd_romfont(1, 34);
cmd_text(60, 32, 1, 0, "34");

Hope it helps, Best Regards, BRT Community

Hi,
I'm working with a BT817 and I've encountered a strange issue with ROM fonts.
According to the documentation, the BT817/8 has built-in ROM fonts with handles 16–34, and fonts 31–34 are large ROM fonts encoded in ASTC 8x8 format.
However, on my system:
EVE_CMD_TEXT(20, 10, 31, 0, "BT817 Flash Image");  // works
EVE_CMD_TEXT(20, 10, 32, 0, "BT817 Flash Image");  // BT817 freezes
Font 31 works correctly, but as soon as I use font 32 (or any handle >31), the BT817 co-processor appears to hang (command FIFO stops progressing).
External flash is working correctly and is in FAST/FULL mode — I can read images from it without any issues.
I'm not sure whether I'll actually need these ROM fonts since I'll probably use custom fonts anyway, but I'd like to understand whether this is a known issue, a configuration mistake on my side, or possibly a silicon/firmware bug.
Thanks in advance for any advice.

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Challenge Date : 12 Jan – 27 Feb 2026

Mission: Create an impactful project on the EVE platform.
Prize: Bridgetek Evaluation Kit +15.6" display + ticket to EW 2026 (10–12 March).
Action: Show us your creativity—bring your ideas to life!
Submit your project here

Our R&D team will be updating the tool to use the latest driver and we'll let you know when the version is released,

Best Regards, BRT Community