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Messages - JeffC

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1
Thanks for the quick replies.
@BRT Community: If I take your example, which had a horizontal 'overhead' (porch I guess) of 128 clocks and a vertical overhead of 45 clocks, that would roughly compute to 30,000,000 / (854+128) / (45+480) = 58 Hz. That should be ok. Subject to actual display requirements of course.
@Rudolf: I was considering a 'smartphone like' display for a product development. The lack of a metal frame on the front side should allow for easy bonding to a cover glass. Longevity of supply is of course the downside.
I don't have a datasheet indicating the complete timing requirements yet. Will report back.

2
Discussion - EVE / Can the FT813 drive a 854x480 (FWVGA) display ?
« on: July 14, 2020, 03:40:49 PM »
The website says the FT813 can drive 800x600 displays. Once I go through the datasheet I see little or no mention of the 800 pixel width limitation anymore. 854x480 (FWVGA) has fewer total pixels than 800x600. So could the FT813 drive a FWVGA display ? Or would the extra 54 pixels simply be black ? Thanks a lot!

3
Discussion - EVE / Re: Problem with my custom BT815 circuit
« on: June 08, 2020, 02:32:16 PM »
GND connection on pin 33 looks suspicious at a glance. (no connection dot shown)

4
Discussion - EVE / Compositing na ARGB8888 image from four L8 images
« on: June 08, 2020, 01:20:25 PM »
I was trying to compose an ARGB8888 image by overlaying four L8 images for the alpha/red/green/blue. I am not getting it right. Does anyone have a sample display list to achieve this task ?

In a second quest, I wanted to not provide the A channel, and instead use the RGB channels to create a one-bit alpha channel on the spot (wherever R, G or B is non-zero, alpha should be full on). I also didn't succeed here. Any help would be appreciated. The engine is still a bit mysterious to me even though I am trying to understand the math behind it ...

Thanks a lot !

5
Discussion - EVE / Color Mask and Blending ... Background
« on: June 08, 2020, 01:11:27 PM »
Hi. I would like to (better) understand the EVE engine. I am drawing a red colored rectangle, with COLOR_MASK set to only affect reds, yet the result is a vaguely red rectangle. Allowing green and blue in the COLOR_MASK makes the red rectangle more red. Here's the display list:

CLEAR_COLOR_RGB(127,127,127) // mid grey background
CLEAR(1, 1, 1)
BEGIN(RECTS)

COLOR_RGB(255,0,0)

COLOR_MASK(1, 0, 0, 0)
BLEND_FUNC(ONE, ZERO)
VERTEX2II(124, 309, 0, 0)
VERTEX2II(260, 444, 0, 0)

I thought the math was
target red = ONE (from BLEND_FUNC) * 255 (source color) + ZERO (from BLEND_FUNC) * 127 (destination/background)
target green/blue/alpha unaffected due to COLOR_MASK

What am I missing ? Thanks !

6
Discussion - EVE / Re: max resolution for video playback
« on: April 09, 2020, 02:43:45 PM »
ok, and if I connect external SPI to the BT815/6, can it pull the data itself from the memory or do I need a host microcontroller pushing it ?

7
Discussion - EVE / Re: max resolution for video playback
« on: April 08, 2020, 07:23:21 PM »
Hi,
unfortunately I cannot test it. I performed this test as part of my evaluation whether the BT815 is suitable for my application, but I only did this "dry" with the asset converter. Would it be possible for you to play the video (it was part of the asset converter samples). Or can you speak from past experience - is the chip capable of playing 800x600 video ?
Thanks.

8
Discussion - EVE / max resolution for video playback
« on: April 08, 2020, 11:41:50 AM »
Hello,
I used the 'Eve Asset Converter' to encode the provided sample video with the big bunny, at 800x480 for a BT815. It appeared grainy (8x8 pixel artefacts). What is the maximum resolution for video to provide no artifacts, please ?

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