Subject:
|
Re: Digital Outputs
|
Newsgroups:
|
lugnet.robotics.handyboard
|
Date:
|
Mon, 31 Mar 1997 15:18:36 GMT
|
Original-From:
|
Gordon Smith <SMITH21@MAILspamless.SDSU.EDU>
|
Viewed:
|
1551 times
|
| |
|
|
>
> I'm interested in finding more on how I might digitally controll
> more devices from the HB.
>
> > From my current knowledge I was thinking it is possible
> (with some asm code) to drive TTL signals to the unused
> ----------------------------------------------------------
> Adam B. Cox check out my web page
> Computer Engineer http://www.zenox.com/~adam
> Zenox Communications Corp. vmail: 416-241-7000 (x224)
> ----------------------------------------------------------
Adam,
Have you thought about using a some of the Motor Chip driver digital
output lines(if you don't need two motor driver chips)? If you pull one of
the L293 chips you can free up 4 digital output lines very easily. It would,
of course, entail some re-writing of code to remove the motor driver
software for the pulled chip but that shouldn't be a problem for a computer
engineer. By the way, could you tell me how you got ouputs with the SPI
header? I'm interested to know because I need two digital outputs myself for
a project.
Gordon F. Smith II
SDSU Mechanical Engineering Student
T-53 Days untill graduation!
|
|
Message has 1 Reply:
 | | Re: Digital Outputs
|
| Gordon, The steps on how to turn the SPI into 4 digital outputs are in the HB FAQ - off the top of my head I think it goes something like this.... poke (0x1009, 0x3c); /* set the 4 DDR bits for SPI (reg D) */ bit_set(0x1008, 0b00000100); /* set MISO (...) (27 years ago, 1-Apr-97, to lugnet.robotics.handyboard)
|
2 Messages in This Thread:
 
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
