Subject:
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Re: NXT external storage
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Mon, 9 Apr 2007 10:21:37 GMT
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Viewed:
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20190 times
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In lugnet.robotics.nxt, Sivan Toledo wrote:
> In lugnet.robotics.nxt, Christian Mock wrote:
> > Hi,
> > what are you thinking about extending the NXT with an external storage for more
> > sounds or karthographic data ?
> > A simple hardware interface NXT==>I2C==>IOPort==>SD-Card is not the problem,
>
> It may work, but it will be very slow. The NXT runs the i2c ports at only
> 9600kb/s, so the data will trickle to the NXT very slowly.
>
> > but how can this supported by operating system (e.g pbLua, NXJ, NXT-G)?
> > Is it enough to add some routines for fetching data fro external SD-Card or
> > is it neccessary to implement a full filesystem driver ?
>
> I think that the answer is yes.
>
> >
> > I've seen such addon for simple AVR-based systems.
> >
> > Thanks for more ideas
> > Bye
> > Christian
Yes, 9600 bits/s is really slow for storage access.
Is there a known way to increase the clock and transferrate of I2C ?
Christian
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Message has 1 Reply:
 | | RE: NXT external storage
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| (...) Yes. RobotC already supports an optional "fast" mode that is five times faster transmission when reading a single byte. For reading multiple bytes from an I2C device, RobotC is about 15 times faster than the NXT-G firmware. There are a couple (...) (18 years ago, 9-Apr-07, to lugnet.robotics.nxt)
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Message is in Reply To:
| | Re: NXT external storage
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| (...) It may work, but it will be very slow. The NXT runs the i2c ports at only 9600kb/s, so the data will trickle to the NXT very slowly. (...) I think that the answer is yes. (...) (18 years ago, 8-Apr-07, to lugnet.robotics.nxt)
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