?? 有人用fpga控制過液晶屏嗎（vhdl).htm
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<H1>有人用FPGA控制過液晶屏嗎（vhdl)</H1></TD></TR>
<TR>
<TD class=gray align=middle height=20>來源：21ic 作者：<SPAN
class=blue>cehon</SPAN> 欄目：<A
href="http://www.dzsc.com/dzbbs/bbs-21.html">EDA技術</A></TD></TR>
<TR>
<TD
class=news_con1>有人用FPGA控制過液晶屏嗎（vhdl)<BR>以前用單片機控制過，比較簡單，現在想完全用fpga，翻譯了好長時間，好像c語言簡單的幾句用vhdl就要好多，象什么初始化啊，定位啊，是方法不對還是本身就復雜啊？（液晶本身帶控制器）<BR>看我翻譯的是不是方法不對啊<BR>//以下是用c語言控制lcd初始化程序中的很小的一部分<BR>p_e=p_di=p_rw=0;//開顯示屏<BR>p_csa=p_csb=0;<BR>p_csa=1;P0=0x3f;p_e=1;p_e=0;p_csa=0;<BR>p_csb=1;P0=0x3f;p_e=1;p_e=0;p_csb=0;<BR>--以下是翻譯的vhdl程序<BR>port(clk
:in std_logic;<BR> datalcm:inout std_logic_vector(7
downto
0);--數據口<BR> rwlcm,dilcm,elcm,cs1lcm,cs2lcm:out
std_logic);<BR>end ;<BR>architecture behav of write is<BR>signal
cnt:integer range 0 to 12 :=0;<BR>signal cs :
bit:='0';<BR>begin<BR>process(clk)<BR>begin<BR>if clk'event and clk='1'
then<BR> if cnt=12 then cnt<=0;<BR> else
cnt<=cnt+1;<BR> end if;<BR> if cs='0' then
--寫128×64顯示屏的左半屏<BR> if cnt=0 then
<BR> elcm<='0';rwlcm<='0';cs1lcm<='1';cs2lcm<='0';dilcm<='0';<BR> elsif
cnt=5 then
elcm<='1';datalcm<="00111111";<BR> elsif
cnt=10 then elcm<='0';<BR> elsif cnt=11 then
rwlcm<='1';cs<='1';<BR> end
if;<BR> else --寫128×64顯示屏的右半屏<BR> if
cnt=0 then
<BR> elcm<='0';rwlcm<='0';cs1lcm<='0';cs2lcm<='1';dilcm<='0';<BR> elsif
cnt=5 then
elcm<='1';datalcm<="00111111";<BR> elsif
cnt=10 then elcm<='0';<BR> elsif cnt=11 then
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