Graphic LCD

rick

I read the article and it is very interesting, but the code seems to be written in verilog, or pseudi verilog.

Where I can find a brief verilog manual?

To print text on display I need to have font on a rom.

Could you explain how to create a file to copy into rom?

I'm also interseted in it

I'm writing an VGA display with incorporated ROM font , for test I just implemented part of font but in the future I will have to implemente all the font so knowing how to generate a file for the rom should be interesting.(I have already made a ROM for an altera component with dspbuilder but actually I doesn't know how to call a file in HDL and be recognized by xst as a rom)

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In what way have you implemented the ROM fonts? (I'm using Xilinx EDK)

I use xilinx ise foundation

the rom is declared in vhdl i declare an array that contains contains each symbol of the font exactely each symbol is reprensated by 8 std_logic of 8 bit i adress the rom by the concatenation of the symbol & the 3 lsb of the adress of the vertical pointer then i peak the right bit with the 3 lsb of horizontal pointer for example 'A' symbol look like

--
"00000000", --

I don't know if you are still looking for IP to write text but I have finish the pre-version of my VGA display , it takes input smbole code save it into a rom that save all the caracter code to display on the screen and then adress the rom with the font the actual configuration is:

640*480 pixels screen 8*8 pixel caracter (so the screen could display 80*60symbols) 25MHz/pixel

actually not all the font is integrated (only A->Z)

here is you could find the *.vhd files the top integrate the display function called afficheur_vga and dummy for test (DCM for dividing frequency and others stuff ) the constraint file is for spartan 3 digilent board if you want to test the design just P&R and program your board =>reset is the last slide switch =>the 3 first slide switch are for color of screen =>the push button are for the are respectevely a, b, c , enter (1sec refresh frequency, could be change by changing the test value of cpt in top.vhd)

The design is not yet finish because I have to change some little thing as complet the font, make generic all I can and make a documentation.

Regards

Alexis

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