hi guys i am currently doing a project for my school. can anyone guide me on how to do a scrolling text display on LCD controller using VHDL? The LCD i am using is a 14 pin. Please provide me with guidance or the source code as soon as possible because my due date is near. Thanks a lot

 

Originally posted by Jeff@Dec 13 2004, 10:51 AM
hi guys i am currently doing a project for my school. can anyone guide me on how to do a scrolling text display on LCD controller using VHDL? The LCD i am using is a 14 pin. Please provide me with guidance or the source code as soon as possible because my due date is near. Thanks a lot

[post=4086]Quoted post[/post]​

Are you limited to use VHDL for that, or can you use MCU's with built in LCD drivers for you purpose?

 

Originally posted by cyberhehe@Dec 13 2004, 10:59 AM
Are you limited to use VHDL for that, or can you use MCU's with built in LCD drivers for you purpose?

[post=4088]Quoted post[/post]​

yes i can only use VHDL for my project,i am not sure about MCU, but i am implementing it onto the Xilinx board.
by the way i found this outline on the net for scrolling text,but i am new to VHDL.
heres the outline:

First, create a memory array that holds the character values and treat
it like a circular buffer from which the character values can be read.
Use the type..is array construct to create an array of 16 8-bit
std logic vectors. Then use concurrent signal assignments to as-
sign the appropriate ASCII value to each element of the array to spell
out your name. Any blank characters should be filled in with the space
character, 0x20.
Create a process that implements a 0-15 counter called offset. This
process should be clocked on the falling edge of a 1 Hz clock signal,
and offset should be defined as an std logic vector(3 downto
0).
Finally, change the line that assigns lcd data to use the character
array created earlier indexed by (addr in + offset). By truncating the
over
flow bit in this summation, we can achieve the modulus operation.
This trick, of course, only works for mod'ing by powers of 2.
Remember to get checked-offset by the teaching assistant before continuing!
Report for Laboratory 3