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 14:44:23 GMT
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Viewed:
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18152 times
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> 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'm open to suggestions. Do we need to set the number of bytes to
expect? Probably not.
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.
Comments?
Ralph
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Message has 1 Reply:
 | | Re: Using NXT Port 4 EIA-485
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| ReHi Ralph, (...) 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 hope we (...) (17 years ago, 17-Apr-07, to lugnet.robotics.nxt)
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Message is in Reply To:
| | Re: Using NXT Port 4 EIA-485
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| (...) Ralph, I'm using an ATMega8 as frontend processor between NXT and SD-Card. Step1: NXT===>I2C===>ATMega...==>SD-Card Disadvantage: Very low speed (9600) Step2: NXT===>EIA-485===>AT...==>SD-Card This should work in an easy way, FAT-Support for (...) (17 years ago, 17-Apr-07, to lugnet.robotics.nxt)
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