出租车计价器VHDL程序

文章摘要：beginfeipin:process(clk_240,start)begin if clk_240'event and clk_240='1' then if start='0' then q_15<=0;q_16<=0;f_15<='0';f_16<='0';f_1<='0';f<='0'; else if q_15=15 then q_15<=0;f_15<='1'; --此语句得

出租车计价器VHDL程序,标签：fpga是什么,fpga教程,http://www.88dzw.com
begin

feipin:process(clk_240,start)
begin
  if clk_240'event and clk_240='1' then
    if start='0' then q_15<=0;q_16<=0;f_15<='0';f_16<='0';f_1<='0';f<='0';
    else
      if q_15=15 then q_15<=0;f_15<='1';          --此语句得到频率为15Hz的信号
      else q_15<=q_15+1;f_15<='0';
      end if;
      if q_16=14 then q_16<=0;f_16<='1';          --此语句得到频率为16Hz的信号
      else q_16<=q_16+1;f_16<='0';
      end if;
      if q_1=239 then q_1<=0;f_1<='1';            --此语句得到频率为1Hz的信号
      else q_1<=q_1+1;f_1<='0';
      end if;
      if en1='1' then f<=f_15;                    --此语句得到计费脉冲f
      elsif en0='1' then f<=f_16;
      else f<='0';
      end if;
    end if;
  end if;
end process;

process(f_1)
begin
  if f_1'event and f_1='1' then
    if start='0' then
w<=0;en1<='0';en0<='0';m1<="000";m0<="0000";k1<="0000";k0<="0000";
    elsif stop='1' then
      if w=59 then w<=0;                             --此语句完成等待计时
        if m0="1001" then m0<="0000";                --此语句完成分计数
          if m1<="101" then m1<="000";
          else m1<=m1+1;
          end if;
        else m0<=m0+1;
        end if;
        if m1&m0>"0000001"then en1<='1';             --此语句得到en1使能信号
        else en1<='0';
        end if;
      else w<=w+1;en1<='0';
      end if;
    elsif fin='1' then
      if k0="1001" then k0<="0000";                    --此语句完成公里脉冲计数
        if k1="1001" then k1<="0000";
        else k1<=k1+1;
        end if;
      else k0<=k0+1;

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