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Questions tagged [vga]

stands for Video Graphics Array and provides a 640x820 screen resolution.

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40 views

HDMI Cat6 cabeling - can a buildings power supply affect transmission?

TLDR; A computer and monitor works at site A, but the exact same setup fails at site B - the only difference is the power sockets used. I have a HDMI over ethernet box which allows me to use Cat6 ...
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2answers
59 views

FPGA: possible to use PC as I/O?

I'm a beginner in FPGAs and I would like to implement a basic CPU with a simple VGA display. If I have a FPGA that has USB-UART could I use my own PC monitor as a display? What about sending input ...
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2answers
460 views

VGA to composite circuit. Does it work?

So I found a VGA to composite passive converter circuit online, and was wondering if it would work, if the vga timings were modified to match the timing of composite. Here is a relevant schematic:
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2answers
119 views

Unable to figure out VGA [Verilog]

After doing plenty of research on how to generate VGA signals and looking at a few code examples, I attempted to write my a simple VGA signal generator that just displays a single solid color on the ...
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2answers
55 views

Fitting USB Data in Cat5 Cable with External Power

I have a camera system at home with a DVR, which connects to a VGA monitor and mouse with which you can read and edit its settings (the cameras can be accessed over the Internet). I've been trying to ...
4
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1answer
296 views

How Significant is VGA Impedance Matching?

I've seen a multitude of different resistor DAC solutions for a VGA signal, however they almost always have an impedance of >200 ohms per color, e.g. when I've been lead to believe that we want to ...
0
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2answers
184 views

VGA cable arcing against computer case

I've tried to turn on my old PC with my old LCD monitor, which is powered by a kettle cable directly from mains, no power supply brick). When trying to get it to work, I have noticed the following ...
3
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3answers
223 views

YPbPr, VGA, Basys3

The Basys3 (a Digilent FPGA) manual says that the VGA analog outputs can drive between 0 and 0.7 volts. Does anyone know if, from a purely analog perspective, this can drive “component video”, ...
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2answers
151 views

VGA impedance matching

i have VGA in one side of my circuit and I want to connect that to a connector with 50 ohm impedance. after that I must convert 50 ohm impedance to 75 ohm, because I have a vga cable in other side. in ...
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1answer
149 views

Vivado Video IPs not working as expected

I've been trying to understand how to utilize AXI-Stream IPs for Video processing and display via VGA for a few days now, but can't seem to get any circuit to work. Here is a test circuit I created: ...
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2answers
348 views

Using old laptop LCD as external VGA screen [closed]

I have a few old laptops with good LCD panels that I wish to salvage and use as external VGA screen on other computers. I'am no expert in electronics but I work with computers and know the basics of ...
1
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1answer
471 views

Resistor DAC and buffer for VGA output

I'm in the process of designing a very simple binary weighted resistor DAC for an output stage of a RGB VGA driver. There will be 3 bits for R and G components and 2 for B. The output signal is analog ...
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1answer
198 views

how to show a picture on monitor through VGA from basys3 [closed]

I must find a picture and upload it into my basys3 board then I must show it on monitor through VGA cable. I dont know how to do that. What are the steps I must take?
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1answer
417 views

Why doesn't my VGA implementation using an AVR microcontroller work?

Problem I'm trying to generate the appropriate signal output for interfacing an AVR ATmega328P microcontroller with an LCD monitor, via the VGA specification. The VGA specification I am trying to ...
0
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1answer
177 views

VGA Output for 640 x 360 (16:9) Display for LCD monitor [closed]

I'm currently designing a TTL-based device to output VGA signals to a 16:9 aspect ratio LCD Monitor with a frame rate of 60 Hz. I hove mostly been referring to this question on how the VGA protocol ...
4
votes
1answer
89 views

Character mask VGA display

Im building a VGA (640x480@60Hz) adapter for my homebrew project but i dont have enought memory to store a framebuffer. Since im using 8 bit memory i plan to do 8 bit color, but 8 colors would be ...
1
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1answer
310 views

FPGA based VGA controller to drive PC monitor

I have implemented a VGA controller in FPGA, for 800x600 resolution @60Hz. Can I use it to drive a PC monitor ? In the PC's monitor resolution settings, it's seen that it supports multiple resolution ...
0
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1answer
110 views

s25fs256s serial flash not responding with RTD2660

Hello guys,, I am interfacing RTD2660 with s25fs256s serial flash using SPI. but when i send the command_type(0x46 (comman instruction type is read)) and command_data(0x9f (command for ...
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1answer
688 views

EGA display converting to VGA - screen's shaking

I've recently tried to make conversion from EGA (probably, couldn't get scope to verify) to VGA to replace an old factory CRT monitor to LCD. Screen displays fine but it appears to shake vertically ...
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3answers
235 views

VGA Image Refreshing

Hey everyone I am looking into VGA protocol. I have researched a lot but only thing I could not figure out is this: Does VGA vertical sync and horizontal sync needs to be sent over and over to keep ...
0
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1answer
340 views

YPbPr to VGA (consoles on monitor)

So the main idea is to take the component video of my consoles and convert them to VGA using the LM1881 IC, to strip the sync signal. If I was going to plug the green cable from my PS2 component into ...
0
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0answers
825 views

4-bit parallel data bus using DMA and GPIO on STM32?

It's possible to generate 8 or 16-bit parallel output on an STM32 by using DMA to transfer from a buffer to the ODR register of a GPIO port, by transferring either a byte or a word at a time. However ...
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1answer
321 views

Modifying VGA Controller For My Monitor

I saw this VGA demo for a 640x480 monitor http://pumpingstationone.org/2013/04/nerp-fpgaok/ and I would like to run it on my monitor using a Basys-3 FPGA. The GPIO demo code for the Basys-3 board ...
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2answers
224 views

Why does this JFET attenuator distort the signal this way?

I have been trying to build a simple VGA using an op-amp and JFET for gain control. I get good results over a small range of voltages (like factor of 10) but as soon as I try to improve this, the ...
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2answers
120 views

Pic32MX Clock too slow

Using pic32mx340F512H and XC32 compiler and ICD3 debugger on MPLAB. So I'm working on displaying colors on a screen using VGA protocol and, thus, need to max the clock speed. The standard for a pixel ...
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1answer
140 views

VHDL/FPGA Should I block down an array into arrays of dimensions with powers of 2?

I'm building a VGA display with a Xilinx FPGA. I'm not exactly sure what's the best way to store VGA frames. The resolution is 640x480. Should I just use a 640x480 2D array or block 640x480 into ...
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3answers
112 views

detect VGA port (through pinout) and send a command to microcontroller

How can i realize that a video project is connected to laptop through a VGA port?? I think I can understand it from the VGA pinout; but i don't know which one?? If I realize it then I can send a ...
2
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2answers
274 views

Converting 100MHz clock to 65MHz clock for VGA

I've written some HDL code to convert the frequency of the clock on FPGA (100MHz) to a freqency which is compatible with my VGA monitor (65MHz): ...
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0answers
853 views

Debugging FPGA VGA connection

I want to display images on the screen and to do this I used this git and this article as references. The specs of my screen are 1280x1024, including porch pixels the dimensions are 1688x1066. From ...
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0answers
97 views

What do these labels mean in the context of VGA timings?

This is the image provided with the De1 SoC development board. I do not know what some of the abbreviations mean in this context VGA_R [7..0] values for red pixels VGA_G [7..0] values for ...
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0answers
96 views

Unable to use the VGA port correctly, De1 Soc distorts signal depending on the output pin

This is a followup to my previous question. The code I was using, pin assigmnets and the theoretical timings for VSYNC and HSYNCH were correct. I have used to oscilloscope to look at the signals, ...
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0answers
345 views

Troubleshooting FPGA VGA connection

I have DE1 Soc development board. I have been following this youtube video in order to start casting some stuff onto the screen. I am unable to display anything on the screen at the moment unless ...
27
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3answers
10k views

Why does VGA have so many ground pins (compared to DVI-I for example)?

If you look at the pinout for VGA, there are several ground pins: I was curious as to why, and I found this answer. To sum it up, the extra ground pins are so that each pin has its own ground in ...
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2answers
260 views

Implementing gravity in VHDL and VGA.

I am working on a vhdl/fpga project using the vga module. I am trying to make an object fall with an acceleration (gravity). I found an answer on another problem, and it suggest to implement something ...
2
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1answer
285 views

How can I convert a VGA signal to work with an old CRT monitor

I'm wondering if it's possible to convert a VGA signal to use as an input to an old CRT monitor (which I believe is monochrome), and if so how I'd go about doing this? The monitor has a 6 pin DIN ...
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5answers
359 views

Is 55ns SRAM fast enough to drive low resolution VGA?

I can't seem to wrap my head around the math. Assuming I want a 640x480x256 VGA signal, and I had an FPGA or fast micro-controller to drive it, would ...
1
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1answer
660 views

Verilog VGA simulation

I am new to FPGA development and to verilog and I am currently working on a project that involves outputting stuff to the screen via VGA port. I only get access to actual FPGA board when I am in class ...
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0answers
140 views

Designing a DVI/DP to VGA converter/converting 16bit bus to 8bit bus at 2x the frequency

as it turns out, new video cards no longer have analog video output. There are multiple converters available for sale, but I have not found one that can do higher resolution than 1080p at a refresh ...
4
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1answer
505 views

How to attenuate a (seemingly) overdriven VGA signal

I own an 8 port Belkin OmiPro2 KVM switch, which is a device used to connect multiple computers to a single display/mouse/keyboard. I've owned this KVM for years and it has exhibited the same symptom ...
0
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1answer
249 views

Video Display Buffer-VGA Port Interfacing

I am trying to get a basic understanding of how VGA port interfacing works.I have started reading SPARTAN 3 VGA Port Interface. I get the function of horizontal and vertical syncs, and the subsequent ...
0
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3answers
149 views

Why is VGA connector has only one pin for red color data but is composed of 8 bits?

VGA connectors have 15 pins, three of these are used for color data of red, blue and green. Based on this project, each color has a width of 8 bits. However if under the scheme of 8-bit color, each ...
0
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1answer
509 views

VGA double buffer with block RAM

I am planning a low key game console for my own leisure, based on the VGA signal. I have implemented parts of it on breadboards with lots of wires, but it is very error prone, thus my move to the FPGA ...
0
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1answer
146 views

VGA display dimmer

I was wondering if it's possible to dim a VGA signal. Assume a PC with a VGA output, which is sending a VGA signal to a screen. Would it be possible by placing a microcontroller (or raspberry pi) in ...
2
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0answers
43 views

How to determine number of pixels required to interface any vga display [duplicate]

I have a guide that tells me that for interfacing 640x480 screen you need 800 pixels in a row and 521 lines along with all of that front and back porch stuff I wanna know how do they determine that ...
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0answers
53 views

Will a monitor work if I make a VGA cable with common return and ground? [duplicate]

This has been bugging me for a while but will a monitor unit work if I make common ground for returns for RGB and the ground? A bit scared to test it on my monitor.
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1answer
311 views

Record video from webcam w/o microcontroller [closed]

I managed to salvage a webcam from a broken laptop, and I'm looking to use it to record video in a small package to attach to a rocket. However, I need to record the video to some data medium like a ...
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1answer
154 views

Using other pic microcontrollers instead of the PIC12C508 (arcade monitor protection circuit [closed]

I want to use another microcontroller because the PIC12C508 isn't available in my country (philippines) I want to use the PIC16f628a or PIC12F510 but I don't know what pins to use and if they're ...
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2answers
280 views

How to generate IP cores with access to hardware in vivado

I am looking for some guide on how create an IP-Core in Vivado which make integrate the hardware. I want to create a IP-Core which should act as an driver for VGA port. The problem is how to create it ...
2
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1answer
2k views

Displaying Characters In Verilog With VGA

I'm taking a intro to ECE course as a CS student and for a final project we are to design a game coded in Verilog using the VGA display on a DE1-SoC board. I decided to create a hangman game but I ...
2
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2answers
840 views

VGA driver not working

I am at the moment trying to make an vga driver for my FPGA, but something isn't going right, and I can't seem to find out what is going wrong... The code is based on this code example: Example VGA ...