Hello Guys...
I want to make Calculator using FPGA Spartan 3A with VHDL code via keyboard.

I have connected PS2 Keyboard with Spartan's LCD.

My Problem is i don't have enough references how to make calculator logic.
any reference and script examples would help me alot...

Thx

Hi Jefri,

I have just started a similar project myself. I am using as a starting point this page describing a reverse polish calculator. It has a little bit on the algorithm used which might help.

http://eng.anu.edu.au/courses/ENGN3213/Projects/RPC_project_ENGN3213_2010_V2.pdf

It is a project that my Uni ran a couple of years ago. I have only just started coding the LCD driver and PS/2 interface, so it will be a little while before I get on to the arithmetic, but perhaps we can discuss?

Cheers,

I didn't realize this was such a standard college project... I had to do the same thing on the same board. You, however, don't give enough info for anyone to really help you. Integer only? Full Floating point? For simple integer calculations, you can use the IEEE.std_logic_signed package. When we did this in college, we were told to use the picoblaze processor. But for simple calculations a simple state machine would be easier. Good Luck.

Hi pbennett,

May I ask how the picoblaze went on this project? I personally didn't do it as I opted for an image processing project, but our cohort was required to design from the ground up using an FSM.

All the arithmetic operations had to be custom coded as well I think. It involved many sleepless nights for everyone involved.

Personally I was thinking of attempting to use only an FSM based approach, but if you think utilising the Picoblaze would be more beneficial, I might be converted.

Regards,

Julian