Help how to use your drivers/C3Synapse VGA about waitvid.2048

[konimaru]

@cbmeeks: I modified my C3Synapse to support VGA on the C3 and can now use it with any scanline driver happy with 20MB/s bandwidth e.g. up to 400x300 (800x600 requires 40MB/s).

OK, to be fair the 400x300 only requires 10MB/s (half horizontal, double scanline) but you get the picture :)

[konimaru]

(re)wiring details: pins 16..18 are cut (underneath the C3Synapse board) and connected as shown below

MOSI -> P16
SCLK -> P17
SS6  -> P18

[konimaru]

As mentioned elsewhere, scanline drivers are more suited for tile and sprite based drivers. In this repository there is currently only one driver which could be used for what you want (monochrome/400x300). This was done as a proof of concept a while back. I'll see if I can dig out some sample code.

[konimaru]

Added simple demo with 7a4b2e4.

[konimaru]

Let me know if you need more help. I'll leave this issue open for a while.

FWIW, the local version (pre-cleanup) had some test code included. When I moved it to the repository this got removed.

[jlswbs]

Many thanks demo wokring fine :-)

Do you plan to create 256x192 with colors in the future? And is memory of the MCU for this? Thank you for the information.

Kamil

(sorry my translator English)

[konimaru]

IIRC any scanline driver in this repository can handle 6bit or 8bit colour mode (per pixel). The main obstacle is that the P1 doesn't have enough memory to provide a frame buffer for even the lowest resolution provided (e.g. 256x192 = 48K). IOW without external memory (e.g. C3Synapse) pixel based full colour graphics will be limited to low resolutions.

[cbmeeks]

I would love to see one of the scanline drivers use external SRAM. Anyone do that before?

[jlswbs]

yes memory problem but thanks usefull info and your great waitvid and modulity works.

[bweir]

Wait, what? You can use external RAM with Propeller video drivers? :O

…

On Aug 17, 2017 11:31 AM, "Marko Lukat" ***@***.***> wrote: @cbmeeks <https://github.com/cbmeeks>: I modified my C3Synapse to support VGA on the C3 and can now use it with any scanline driver happy with 20MB/s bandwidth e.g. up to 400x300 (800x600 requires 40MB/s). — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#9 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AJEcGFxHXfjoAiu2SoKdmnNZJBGYlf-dks5sZIasgaJpZM4O3-ks> .

[drawkula]

@konimaru ... maybe I need to dedust my C3Synapse... are your modifications documented somewhere?

[cbmeeks]

@konimaru can you elaborate on the C3Synapse? Are you saying you're running VGA video from external SRAM?

[drawkula]

@cbmeeks ... http://forums.parallax.com/discussion/140402/prop-c3-add-on-expansion-board-c3-synapse-is-coming-soon/p1

The examples there are not VGA-out... but external RAM for TV-out like graphics was already possible.

[konimaru]

I posted the (memory) driver code in this thread. The glue code for using a scanline driver is somewhere on my harddisc but hardly rocket science.

C3Synap2e - Archive [Date 2017.08.18 Time 00.49].zip

@cbmeeks: Yes, currently read-only but VGA from external SRAM is what I have here.
@drawkula: No public documentation, I can dig out the details. It's basically cutting a few pins from the bus connector and rewiring the CS stuff to SPI device 6.