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Found 9 results

  1. Shubham Jain

    Interfacing PmodCLP with arduino

    I am not able to interface PmodCLP with arduino UNO. Code provided on the website is compiling but lcd is showing nothing. Please provide me the working code and image.
  2. PoorCollegeStudent

    Not understanding LCD Display

    Hello Digilent community, I am currently taking my first digital electronics class and my final project is a calculator written in VHDL using a Basys3 board, 16-key keypad, and a 16x2 LCD display with parallel interface, all provided by Digilent. I took a look at the provided example code from the resource library and I just had some questions about how it works. Now, the example code declares a constant before any of the processes, and this constant is an array of std_logic_vectors so it holds a preloaded message "Hello From Digilent" with the necessary function sets and all that preceding the message. In my case, I have to have a way to display the inputs from the keypad on the display and also display the output on the 2nd line of the display. I have the main logic part of the calculator settled, I just want to know how I can direct these signals from the keypad and the output of the computational module (as in the sum, difference, product, etc.) to the LCD display. I have never played with a display before now and never used VHDL or any type of board like the Basys3 before this class, so I guess I'm still quite novice and don't understand a good part of what the example code is telling me. I do get that the state machine is just cycling through the values in the constant and waits for certain delays to pass through before transitioning between certain states. Since the values on the display have to be updated live as the user inputs numbers from the keypad and also when there is a value computed, how can I shift from having a constant with a preloaded message to something that can update itself as needed? My idea was keep the idea of the array of std_logic_vectors but only have one value (rather than the 23 or 24 that are preloaded in the current example code) that will update with every key press. I'll have two of these, one for the inputs (to show the numbers and operations on the first line) and one for the output (to show on the second line). I'm thinking maybe I declare a variable within a process that will update and be sensitive to the key presses? Also, I tried looking around the reference manual and such but I could not find the function code for how to display information on the 2nd line; so far, stuff only displays on the first line. Sorry this is such a bulky post. I have had a lot of questions and my professor hasn't been around much. Also, part of this project is learning to interface with new components, so in my case the keypad and lcd display, and I'm not having much luck without any guidance unfortunately. Thank you for taking the time to read this! P.S. Attached the example vhd file from Digilent here for easy access in case anyone wants to look! PmodCLP.vhd
  3. Hi, I have been working on a PMOD TFT LCD that can be used to play video directly from the FPGA using only two PMODs. I designed the hardware a couple of years ago but recently I had to do a project where I needed to use the Vivado block diagram interface. I thought it was pretty cool how fast it was to put a design together so I went about making an IP Core that controlled the PMOD. It has an AXI Lite interface used to initialize the LCD and then a AXI Stream interface that can be connected directly to a VDMA core. I ended up making three different demos including the following: Using the Microblaze to write directly to the screen. I wrote another core that behaves like a console output that will write directly to the screen for you so the MCU doesn't need to write the console stuff to the screen. I streamed video. Unfortunately this was harder than I expected and had to use the Pynq board instead. Here's a video of it working. I wrote a project page on hackaday.io with more details https://hackaday.io/project/25333-pmod-tft-board I was thinking of trying to sell the boards but I didn't know if there would be any interest. Dave
  4. glenalec

    LCD panel via pmod port

    I am wondering if, specifically for the Arty Artix-7, one of the pmod ports could theoretically be configured to carry enough data to drive a 1024x600x18-bit LCD at 24fps or greater, preferably on an LVDS interface.
  5. Riesenrad

    Best Pmod for Debugging / Output

    Hello together, I'm a student and I am going to buy the Basys3 board. At that nice student price I thought I'd get a Pmod for Debugging like a little screen. I will be programming only hardware circuits and my own processors. As it seems to me, all tutorials for the OLEDrgb Pmod are made for use with the Microblaze which is not something that I plan to do. For that kind of stuff I already have microcontrollers lying around. I want to be able to access the screen / output (maybe only leds are possible for this purpose? and 7 segments?) directly via my hardware like turning on and off LEDs for debugging and maybe also for displaying actual useful information. What would be the best Pmod for this sake? OLED? LCD? Are these even accessible via SystemVerilog? 7 Segment and LEDs should work afaik but the board already has a lot of them... Some examples: Showing which state of an automata I'm in, Showing if my clock is working, Displaying results of a calculation, ... Thank you in advance! Riesenrad
  6. prakhar

    Character set of Pmod CLS

    Hi, What is the Character set of Pmod CLS? I need what characters can be displayed and their hex/binary values which need to be used. Also, Are there predefined symbol for euro,pound,yen in Pmod CLS? Thanks Prakhar
  7. Hi everyone, Could somebady give me a Little help... I have a Chipkit 32mX7... Im trying to do some programs to learn the use of this dispositive, could help me with a code in C to do the next program... I have the keyboard 4x4 and a PmodCLP (LCD) so i want to do the next activity: when i pulse 1 on the keyboard I want to display 1 on the LCD.. So could you help me with this? How need to be the code wiith the ports, the delays and that.. Thanks....
  8. ricardo_lara_gomez

    some LCD for spartan 3E?

    I need to know if there is any LCD for Spartan 3E board....................... please help me
  9. I just got this up and running: http://youtu.be/dIAJrQxToCc It's a custom TFT LCD controller board using only two PMODs. The board controlling it is an FPGA devboard that communicates with the host computer using the FTDI's FT2232H in synchronous FIFO mode so that I can transfer data between the host and board at a rate of about 25MB/s using a simple protocol. I wrote a scripting tool that glues together wishbone cores to create an FPGA image using a simple configuration file. Editing configuration files are great but I thought it would be so much better if I could modify the FPGA image by using a GUI so I worked on an application that does that. Here is a screen shot of how I visually created the LCD controller. One of the big limitations of using USB 2.0 is the relatively large overhead to initiate a transaction, It's much faster if you send a large chunk of data. So instead of writing directly to the LCD controller I write to the SDRAM and then configure the LCD controller to read directly from the memory. This way I can write a new frame down to memory while the LCD controller is reading data out using a double buffer scheme (host writes to back, controller reads from front, then flip). The protocol to communicate with the FPGA is a really simple protocol abstracted away in Python to simply 'read' and 'write'. It was pretty cool to communicate with the FPGA using a python module but I thought it would be so much better if I could interface with an FPGA using a GUI. So I added a visual interface to communicate with it (That's what I was using in the video). If you're interested in the board here's the link: http://wiki.cospandesign.com/index.php?title=Dionysus the code to control the LCD is here: https://github.com/CospanDesign/nysa-verilog/tree/master/verilog/wishbone/slave/wb_nh_lcd The code is designed to be as generic as possible, so if you want to adapt it to your project it really just needs a wishbone bus but you can bypass Wishbone by just using the nh_lcd.v