Subject:
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Re: Non-polaroid Sonar
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 16 Mar 2000 18:30:41 GMT
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Original-From:
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Will Bain <willb@selway.umt.&nospam&edu>
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Viewed:
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1855 times
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Adam Oliver wrote:
> Just so I'm clear, ref pink book page 10-17.
> Does the "bit_set( 0x1021, 1 );" refer to bit 0 -EDG3B, and
> bit_clear( 0x1021, 2 ); " refer to bit 1 -EDG3A.
> This is what was throwing me, I always thought bits started at zero and
> ended at 7, not 1 to 8 as appears to be the case here. Is this what the
> "zero-indexed " means?
>
> sorry if it's a basic question, but if you don't ask you never learn :-)
No, that's a very good question. It had me confused, too. The second argument to bit_set and bit_clear is not actually the index of a bit at all; it's a bit mask.
For example, when you do bit_set( 0x1021, 3 ), the 3 becomes 0000 0011 in binary, so it will set the last two bits of the address. Hope this helps!
-- Will
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Message has 1 Reply:
 | | Re: Non-polaroid Sonar
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| Hi all, I'm now building the ultrasonic sensor from kam leang's page, did anyone interface it with handyboard?? Can anyone give me some advice on driving it? thanks Frankie Lai 97139371d@polyu.edu.hk (...) to bit_set and bit_clear is not actually (...) (25 years ago, 16-Mar-00, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Re: Non-polaroid Sonar
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| Thanks for your help :-D Just so I'm clear, ref pink book page 10-17. Does the "bit_set( 0x1021, 1 );" refer to bit 0 -EDG3B, and bit_clear( 0x1021, 2 ); " refer to bit 1 -EDG3A. This is what was throwing me, I always thought bits started at zero (...) (25 years ago, 16-Mar-00, to lugnet.robotics.handyboard)
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