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what's the wrong with this vhdl program

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samar_mohammed

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-- this program is to calculate the value of bmi which equal to =(wight/length^2) where length in meter i don't know the error could u help me ^_^

Code VHDL - [expand]
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library ieee;
use ieee.std_logic_1164.all;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
-------------------------------------------
entity BMI_mesure is 
port (length :in STD_LOGIC_VECTOR(7 DOWNTO 0);
      wight  :in STD_LOGIC_VECTOR (7 DOWNTO 0);
      BMI :out STD_LOGIC_VECTOR (6 DOWNTO 0));
end entity BMI_mesure;
--------------------------------------------
architecture BMI_behav of BMI_mesure is
begin
 process(length,wight)
 variable BMI_value :STD_LOGIC_VECTOR(6 DOWNTO 0);
 variable LENGTH_value :STD_LOGIC_VECTOR(7 DOWNTO 0) :=LENGTH;
 variable WIGHT_value :STD_LOGIC_VECTOR(7 DOWNTO 0) :=WIGHT;
   begin 
    BMI_VALUE(6 DOWNTO 0) :=(WIGHT_value(7 DOWNTO 0)/((LENGTH_value(7 DOWNTO 0)*LENGTH_value(7 DOWNTO 0))/10000));
    BMI <= BMI_value(6 DOWNTO 0) ;
 end process;
end architecture BMI_behav;
 
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Re: what's the wrong with this vhdl programm

you didnt say what the error is. But I suspect its the fact there is no "/" function in the std_logic_unsigned package.

I suggest you use the numeric_std package instead, or use integers.
 

Re: what's the wrong with this vhdl programm

when i use this library it appears this error
ERROR :LIBRARY ERROR :pRIMARY UNIT "NUMRIC_STD"denoted by prefix "ieee"must exixt in the library
 

Re: what's the wrong with this vhdl programm

If that error message was cut & paste, then ... NUMRIC_STD != NUMERIC_STD As in, try adding an E. ;)
 

Re: what's the wrong with this vhdl programm

no the message wasn't copy & paste i just rewrite it, so i just missed 'e' when i wrote it again ^_^
i wrote it numeric_std and i had this error
 

Re: what's the wrong with this vhdl programm

bummer. :p So much for an easy fix. ;)
 

Re: what's the wrong with this vhdl programm

What I meant was that is was a pity that you didn't make a typo (forgot the E). A typo would have been easy for you to fix.
 

Re: what's the wrong with this vhdl programm

any way thanks for help my problem seems no solution :(
 

So what is the full code you actually use and what is the full error?

Case in point: there's no numeric_std mentioned anywhere in your code in the first post.

And while I'm being pedantic ... you probably mean "weight". A wight is a mythical creature. :p
 

If your formula for bmi (in the text before your code) is BMI = W / (L*L), then what is the /10000 in line 19 for? Also, if L is in meters you aren't going to have much resolution in your results. The integer results are also going to make things worse.
 

yes L is in meter and i use 10000 to convert it to cm this program doesn't work with me when i ask they say that this program can't deal with it like software programming i have tto define divided operation as hardware implementation.
 

I suggest you post the full code but my first suggestion is that you better use real in stead of std_logic_vector. And I assume you're not going to implement this in real logic?
 

this part of my project i have to calculate the value of fat in human body. i use before that integer instead of std_logic_vector it has the same problem is at end i delete that from my project to make it work :(
 

this seems like a very strange project to do in VHDL. something like this would usually be a software task. Are you trying to put this on a real FPGA?

And can you please post somne more code with the errors you are getting.
 
^_^
at end i did that i suppose that this is must be software task so i just did that i revive the value of bmi from external source and i did my whole program on that suppose.
yes i do. i fix all error that i was getting ^_^
 

we can't help you further if you don't post some code, but as tricky suggested, body mass index is a task that is better to implement in software. The same is true for fat percentage calculation.
 
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