Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Problem in Pc based clock

Status
Not open for further replies.

Indian

Junior Member level 3
Joined
Jun 2, 2005
Messages
26
Helped
1
Reputation
2
Reaction score
0
Trophy points
1,281
Activity points
1,539
sir i am doing a project of displaying pc time in seven segment displays.
i use the parallel port to pass the bcd coded data of hour and minutes and display them by using 4 7segment displays. Here i used a bcd to seven segment decoder to convert the bcd code. now when i give the input manually to the board the led glows and works correctly, but when i give data from pc its doesnt works
i cant identify the problem pls do help
 

echo47

Advanced Member level 5
Joined
Apr 7, 2002
Messages
3,942
Helped
636
Reputation
1,270
Reaction score
88
Trophy points
1,328
Location
USA
Activity points
33,183
Are you sure the PC is outputting the signals? You didn't say what software you are using, so I'm guessing that you wrote a program that runs under Windows XP or 2k. Those operating systems prevent user programs from accessing I/O ports, unless you install a kernel mode device driver such as PortTalk. There's a link to it here:
http://www.lvr.com/parport.htm
 

    Indian

    points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top