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POVHDL: nth digit of decimal integer
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  1. POVHDL: nth digit of decimal integer
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    copied!<p>I have an integer signal (range 0 to 9999). I’m trying to display it on set of 7-segment displays. I have implemented multiplexer (one digit is displayed at once). Now I need to split my integer into single digits. </p> <p>Theoretically it is very simple: just use mod (ex NUM / 100 mod 10 gives second digit). Problem is that when I’ve compiled solution with mod (used 4 times) my code used over 9000 cells just for mod. That is too much (but works). </p> <p>Then I tried casting to smaller integer, but it doesn’t work. Integer range 0 to 9 uses 4 bits so it is really range 0 to 15. </p> <p>I’m sure there is simpler on obvious solution but I wasn’t able to find it. Please note that I’m beginner :).</p> <p>EDIT: the code:</p> <p>This part sets proper output to display for given digit <pre><code></p> <pre><code>process (clk) begin if rising_edge(clk) then case number1 is -- od prawej: a b c d e f g when 0 =&gt; segment &lt;="1000000"; -- '0' when 1 =&gt; segment &lt;="1111001"; -- '1' when 2 =&gt; segment &lt;="0100100"; -- '2' when 3 =&gt; segment &lt;="0110000"; -- '3' when 4 =&gt; segment &lt;="0011001"; -- '4' when 5 =&gt; segment &lt;="0010010"; -- '5' when 6 =&gt; segment &lt;="0000010"; -- '6' when 7 =&gt; segment &lt;="1111000"; -- '7' when 8 =&gt; segment &lt;="0000000"; -- '8' when 9 =&gt; segment &lt;="0010000"; -- '9' when others=&gt; segment &lt;="1111111"; end case; end if; end process; </code></pre> <p></pre></code></p> <p>This part selects display (1 of 4) and sets digit value</p> <pre><code>process (clk) variable count: integer range 0 to 1000; begin if rising_edge(clk) then if count = 1000 - 1 then count := 0; case digit is when "1000" =&gt; digit &lt;="0001"; number1 &lt;= year/1000 mod 10; when "0001" =&gt; digit &lt;="0010"; number1 &lt;= year/100 mod 10; when "0010" =&gt; digit &lt;="0100"; number1 &lt;= year/10 mod 10; when "0100" =&gt; digit &lt;="1000"; number1 &lt;= year mod 10; when others =&gt; digit &lt;="0001"; end case; else count := count + 1; end if; end if; end process; </code></pre>
 

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