Lp2900

Hi everybody, i'm &nbsp;new in VHDL and i've some issues with one topic in vhdl and i wish you could help me. actually,i'm doing with a project on 4 digit coded lock with an LCD display. The purpose mean that i have to manage a 4*3 keyboard , one LCD display , 8 bits comparator , one RAM , one alarm , and the lock. for doing i've the LP2900 of LEAP and Altera IDE. Here Is my problems i've done with the keyboard and the LCD display but when i try to connect then, the programm run but the caracter don't display. and when i run them apart everything work properly, actually i dont understand this stuff&nbsp;<img src="images/smilies/cry.gif" border="0" alt="" title="cry" smilieid="38" class="inlineimg">. i try everything &nbsp;in my knowledge &nbsp;but no way. help please&nbsp;<br><br>