Gerts VGA addon

[Matty11611]

Hi, i like the idea of having two outputs from the Pi B+ however have bought the kit and tested all resistors are in the correct location followed the instructions several times from the manual and still no output, bought a new add on board and still nothing even after a fresh install and doing every step again. currently bought 2 add on boards with no success, please help, its part of my final year group project and i cant afford the time learning coding to work out where im going wrong. can i also add i found something about blacklisting which i have also done still with no joy, any other suggestions would be much appreciated, i have tried on 2 seprate vga monitors with different resolutions to no avail any help would be much appreciated

[DirkS]

Did you change the settings as described in http://www.raspberrypi.org/forums/viewt ... 91&t=94424?

[Matty11611]

hi, yes i have followed exactly as it says on the page and tried with two add on boards, if anyone could upload a .img image with this working then i can rule out the addon board and the software side of things

[BMS Doug]

hi, yes i have followed exactly as it says on the page and tried with two add on boards, if anyone could upload a .img image with this working then i can rule out the addon board and the software side of things

Hehe, I misread that and was going to post a picture of my GertVGA board.

One problem I ran into was that my TV (whicha has a VGA input as well as HDMI) would only take VGA in one specific format, so I had to get the output mode precisely right before the display would work. Might you be running into the same problem?


(what the heck, I will post this anyway, even though it's not the sort of image you wanted)
Here's a pic of my one (assembled)

[Matty11611]

Doug, Thanks for your response, would it be possible for you to make a copy of the os that you have running with your tv so i can try exactly the same os system image, i have 2 monitors and a tv so hopefully with a known working screen, vga board and image i can work on whittling the issue down.

Thanks again, i assume you just changed the mode and group of the dpi?

[BMS Doug]

Doug, Thanks for your response, would it be possible for you to make a copy of the os that you have running with your tv so i can try exactly the same os system image, i have 2 monitors and a tv so hopefully with a known working screen, vga board and image i can work on whittling the issue down.

Thanks again, i assume you just changed the mode and group of the dpi?

It was a while back and I only assembled it to have a go and tried it out to see if it would work.

Yes finding out the mode and group that my TV would accept was the solution.

I'll dig out that SD card and boot up my laptop tonight.

[Matty11611]

Doug, thats great, i can get the same signal through hdmi - vga active converter box which is putting out full HD and will see that so assuming that the VGA adapter cant output any higher res than 1920x1080 meens the screen should accept anything, but if you could send me the img file that would be great. im also trying to cross compile a kernel with a custom logo in the top left, i have created a .ppm file but everything else seems to go wrong if you have any knowledge with that, that would also be much appreciated.

Thanks again

[BMS Doug]

Sorry Matty, I can't find the power supply for my ancient laptop, I'm not going to be able to make that image file. (We are having a bit of building work down so everything is in chaos here).

[BMS Doug]

Dirk S suggested in another thread that the latest pi install may cause problems because of device tree. I have seen posts describing how to disable device tree but I can't get this tablet to copy/paste at the moment.

[Matty11611]

thanks again that is great, i shall try to find an older copy of raspbian however unsure where to get an older version from

[DirkS]

Dirk S suggested in another thread that the latest pi install may cause problems because of device tree. I have seen posts describing how to disable device tree but I can't get this tablet to copy/paste at the moment.

AIUI Gert's VGA adapter actually uses device tree for setup; the dt-blob.bin is a compiled device tree file; similar to the ones used in the new Pi2B kernel.

I'll have a look at my backup images to see if I have one set up for gert's vga adapter
(the one I'm currently using has the rootfs on a USB stick)

[Matty11611]

DirkS you had any luck in finding your working image yet?

[DirkS]

DirkS you had any luck in finding your working image yet?

Try this image https://www.dropbox.com/s/zszpjr33rc0wu ... p.zip?dl=0. It's a zipped image and IIRC it worked the last time I tried it.
It's from an 8GB SD card; I tried to shrink it so that it ould fit on a 4GB card, but I had problems when I tried that.
The zipped image is about 740MB.

I would comment dpi_group and dpi_mode settings so that it defaults to 640x480

[Matty11611]

Thanks Dirk, in a lecture now till 6 so will give that a try when i get in, got a 8gb microsd read so will give that a whirl, just another quick question, have you managed to make any kernels yet for the RPI, im struggling and just want to change the logo in the current one.

[DirkS]

just another quick question, have you managed to make any kernels yet for the RPI, im struggling and just want to change the logo in the current one.

Yes, I have cross compiled kernels for the A(+) and B(+) a couple of times using the instructions at http://www.raspberrypi.org/documentatio ... uilding.md.
I have done most of that on an elderly notebook with Debian installed. Also tried it in a VirtualBox VM with Debian. Both worked fine.
First time it looks a bit daunting, but it's actually pretty straightforward.

Gr.
Dirk.

[Matty11611]

Just wondering if anyone has managed to get a global dual screen where once booted two displays can be seen through VGA and HDMI, only need it to work with impress but if there is a global method this would be better