Project: HDMI/DVI out for STFM

Progress on our FPGA cores.
User avatar
Smonson
Posts: 708
Joined: Sat Oct 28, 2017 10:21 am
Location: Canberra, Australia
Contact:

Re: Project: HDMI/DVI out for STFM

Post by Smonson »

User avatar
exxos
Site Admin
Site Admin
Posts: 23437
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Project: HDMI/DVI out for STFM

Post by exxos »

Program doesn't seem to be doing anything ?

IMG_3627.JPG
IMG_3627.JPG (43.95 KiB) Viewed 4159 times
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
User avatar
exxos
Site Admin
Site Admin
Posts: 23437
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Project: HDMI/DVI out for STFM

Post by exxos »

Tried in medium res..

now just stuck on this...

IMG_3628.JPG
IMG_3628.JPG (96.62 KiB) Viewed 4157 times
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
User avatar
Smonson
Posts: 708
Joined: Sat Oct 28, 2017 10:21 am
Location: Canberra, Australia
Contact:

Re: Project: HDMI/DVI out for STFM

Post by Smonson »

Doing nothing is good, it means it's only reading zeroes (or 1 in medium). Like me, your machine works with the mod for some unknown reason.
User avatar
exxos
Site Admin
Site Admin
Posts: 23437
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Project: HDMI/DVI out for STFM

Post by exxos »

I removed the cap I added and this is what happens to the video...

( still get nothing in that program with the cap removed)




IMG_3630.JPG
IMG_3630.JPG (462.71 KiB) Viewed 4145 times

Video is fine with the cap.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
User avatar
exxos
Site Admin
Site Admin
Posts: 23437
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Project: HDMI/DVI out for STFM

Post by exxos »

Smonson wrote: Fri Nov 30, 2018 8:27 am My observations:
  • The latching behaviour is only level-sensitive, so high-frequency noise around the transitions shouldn't cause glitches
  • The values that are being read seem very non-random, in the sense that either reads the whole word perfectly, or else it reads it with 8-12 wrong bits. It never reads just one wrong bit here and there. The pattern of bits is also very uniform, e.g. 0xb479 comes up a lot (see video and screenshot posted by Icky above)
  • The reason I don't think it's clock related is that both Icky and Troed have the same behaviour, and Troed is using a totally different clock.

Could you get your program to output in binary instead ? Then be easier for people to see if any particular bit(s) are having issues...
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
User avatar
Smonson
Posts: 708
Joined: Sat Oct 28, 2017 10:21 am
Location: Canberra, Australia
Contact:

Re: Project: HDMI/DVI out for STFM

Post by Smonson »

That's more good evidence that the register read problem isn't related to clock stability :dualthumbup:

The line of Xs is the value in binary.
User avatar
Smonson
Posts: 708
Joined: Sat Oct 28, 2017 10:21 am
Location: Canberra, Australia
Contact:

Re: Project: HDMI/DVI out for STFM

Post by Smonson »

Icky wrote: Thu Nov 22, 2018 11:01 am
^ This is what it looks like on Icky's machine while running the test program.

Each line represents a read off the resolution register (the whole 16bit word) that differs from the previous value.
User avatar
exxos
Site Admin
Site Admin
Posts: 23437
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Project: HDMI/DVI out for STFM

Post by exxos »

Smonson wrote: Fri Nov 30, 2018 11:44 am ^ This is what it looks like on Icky's machine while running the test program.

Each line represents a read off the resolution register (the whole 16bit word) that differs from the previous value.
So what motherboard revisions are people using then ?

This is mine..
IMG_3631.JPG
IMG_3631.JPG (1.12 MiB) Viewed 4219 times

Different boards tend to have different "faults".

Is everyone's HDMI board exactly like the one I have ?
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
User avatar
Smonson
Posts: 708
Joined: Sat Oct 28, 2017 10:21 am
Location: Canberra, Australia
Contact:

Re: Project: HDMI/DVI out for STFM

Post by Smonson »

Mine's a C103414-001 rev 1.1.

The HDMI boards are all the same, unless I'm misremembering (V4).
Post Reply

Return to “FPGA DEVELOPMENT”