DDS VFO with AD9850 / AD9851 and PIC16F877A
 

Jim wrote:

snip

The general problem is going to be that WINXP, 2000, Vista, and NT make
it difficult to use the printer port pins directly. Not impossible, but
certainly a problem.


Please see http://www.beyondlogic.org/porttalk/porttalk.htm for the 'allowio
driver' for interrupt-based parallel port access. The 'JWA' logic analyzer
software 'digitrace' uses this on NT-based Windows with good results.
The logic analyzer software is at:
http://www.xs4all.nl/%7Ejwasys/old/ select 'DigiTrace' in the left frame.

Regards,

Michael

DDS VFO with AD9850 / AD9851 and PIC16F877A
 

Micheal Wrote:

Jim wrote:

The general problem is going to be that WINXP, 2000, Vista, and NT
make it difficult to use the printer port pins directly. Not
impossible, but certainly a problem.


Please see http://www.beyondlogic.org/porttalk/porttalk.htm for the
'allowio
driver' for interrupt-based parallel port access. The 'JWA' logic analyzer
software 'digitrace' uses this on NT-based Windows with good results.


I had problems using allowio for a visual basic program I wrote... I
kept getting a process ID of 0 no matter what I tried.

Also, I believe this does not work for Vista computers. Vista locks down a
lot more of the computer system.


Jim
N6BIU



--

23:27 Pacific Time Zone
Oct 23 2007

International Time
06:27 UTC
24.10.2007

DDS VFO with AD9850 / AD9851 and PIC16F877A
 

Jim wrote:
On Mon, 22 Oct 2007 12:54:16 -0400, Jimmie D wrote:

I want to build something like this but without the PIC interface. Instead
I want to control it directly from a printer port. I am looking for
examples of software that can talk to DDS chips in this manner. As a
matter of fact I plan on building the device so that the whole thing will
fasten to the printer port or possible mounted internal to the PC. Any
help would be greatly appreciated.


Jimmie



The general problem is going to be that WINXP, 2000, Vista, and NT make
it difficult to use the printer port pins directly. Not impossible, but
certainly a problem.

You could use something like a PIC877 or some such to act as a serial
input which would then allow using Rs232 to communicate from the PC to a
radio.

Alternatively, use WIN98 and the printer pins are "up for grabs" with
fairly simple PC programs.
=================================
Or consider embracing Linux.
It might involve an initially steep learning curve , but a worldwide
Linux community is on tap to help.

Frank GM0CSZ / KN6WH