Subject:
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Re: Digital Outputs
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 1 Apr 1997 05:37:11 GMT
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Original-From:
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Adam <ADAM@saynotospamRING.ZENOX.COM>
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Viewed:
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3953 times
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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 output (high) */
bit_set(0x1008, 0b00001000); /* set MOSI output (high) */
bit_set(0x1008, 0b00010000); /* set SCK output (high) */
bit_set(0x1008, 0b00100000); /* set SS output (high) */
/* bit_clear will toggle the above outputs low */
On Mon, 31 Mar 1997, Gordon Smith wrote:
> >
> > 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!
>
>
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Message is in Reply To:
 | | Re: Digital Outputs
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| (...) 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, (...) (30 years ago, 31-Mar-97, to lugnet.robotics.handyboard)
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