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Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
Hi all, I am posting my new project with FPGA's here. A few people of 4hv chat already know about that but others dont.
Its and Virtual Terminal that gets the data from RS232 and shows on a LVDS LCD Screen (Laptop one), also, it gets the scancodes from a PS2 Keyboard and send the ASCII Code via RS232 too.
Here is a video of the working project:
I released the source code today at my site and at OpenCores.
Also, I made a document explaining the LVDS interface and how I made to control the LCD:
Working:
- Serial Data Receiver writting to Char Ram - Fixed 80x60 Char RAM - EnergyLabs Logo on ROM - ScanCodes on ROM - IBMPC 8x8 Font on ROM - All ROMS was implemented as blockram, so I am using about 50% of the block ram resources. - LCD LVDS Controller Uses modified XAPP486 and its a LVDS33 Signal. - Parallax Scrolling BackGround (Made with logic) - EnergyLabs Logo with Transparency (Color-Key)
Todo:
- Faster Serial Receiver. Dunno why its so slow to receive chars on the serial, even at 115200 (Maybe its something when write) - Dynamic Console Size - All ROMS stored at external flash - Modify XAPP486 or make a new 7-to-1 serializer (I tryed that, but the maximum speed at my core was only 40MHz), because I dont know how Xilinx made the XAPP486 and it has 4 channels (we only need 3) and the bits are in a different way. - External RAM for Screen, actually I wasnt done that because I Dont have external ram.
Few things:
- The XAPP486 sends the 7 bits for each channel in a different way that LCD needs, as I didnt understand how XAPP486 was write, I only mapped the correct bits. Its working correct, but I think it can be better.
Have fun :D
I thank Joshua and other people on the 4hv chat for the help they gave me :D The PS2 Keyboard Control is from Joshua, I only rewrite the scancodes to match to ABNT2 (my keyboard)
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Virtual Terminal via RS232 - FPGA Project
