Subject:
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Re: Using NXT Port 4 EIA-485
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Tue, 17 Apr 2007 14:43:43 GMT
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Viewed:
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18125 times
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ReHi Ralph,
In lugnet.robotics.nxt, Ralph Hempel wrote:
> > I'm using an ATMega8 as frontend processor between NXT and SD-Card.
> >
> > Step1: NXT===>I2C===>ATMega8==>SPI===>SD-Card
> > Disadvantage: Very low speed (9600)
> > Step2: NXT===>EIA-485===>ATMega8/16===SPI==>SD-Card
> >
> > This should work in an easy way, FAT-Support for SD-Cards is available
> > and running...
>
> Great idea Christian! What kind of API do you need to make this work?
>
> I think these might get things started:
>
> nxt.RS485SetParam( speed, parity, databits, stopbits )
> nxt.RS485SendData( string, bytes )
> string = nxt.RS485GetData( bytes )
> status = nxt.RS485GetStatus()
I'd like to have some address information for device number added (can be done
at a higher layer ?)... EIA-485-Hardwareconcept allows to handle more than one
target :D
ID0: Master (NXT)
ID1: SD
ID2: Camera :D
...
> I'm open to suggestions. Do we need to set the number of bytes to
> expect? Probably not.
I hope we can avoid this :D
> Send and receive under interrupts and DMA, probably.
>
> Need to read into a buffer, and keep track of TX status so we don't
> flood the transmitter. • Would be nice :D
>
> Comments?
Yes, how do you think we can add reading lua chunks into the system ? Currently
we have no lua-io routines (e.g. dofile())...
Do you know a simple way to do it today ? I'd like to start this weekend testing
io via I2C connection... slow but better as nothing ;-)
Christian
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Message is in Reply To:
 | | Re: Using NXT Port 4 EIA-485
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| (...) Great idea Christian! What kind of API do you need to make this work? I think these might get things started: nxt.RS485SetParam( speed, parity, databits, stopbits ) nxt.RS485SendData( string, bytes ) string = nxt.RS485GetData( bytes ) status = (...) (17 years ago, 17-Apr-07, to lugnet.robotics.nxt)
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