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 12:26:05 GMT
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Viewed:
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18126 times
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>
> 1. This is NOT an SPI interface - which is what the SD cards need
> 2. It's a simple half duplex serial port, so any complex comms
> will need a protocol wrapped around it.
> 3. It should still be possible to bit-bang the I/O lines, but you
> won't get true SPI out of it since you need CLK, MOSI, MISO for
> SPI.
>
> Ralph
Ralph,
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...
Bye
Christian
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Message has 1 Reply:
 | | 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 = (...) (18 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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| (...) Christian, There is currently no direct support for this in pbLua, but it's not too hard to add. The HighSpeed port is port 4, and it has basically 3 wires that control how it works. PA4/5 are the RX and TX to UART0 right on the ARM PA7 is RTS (...) (18 years ago, 16-Apr-07, to lugnet.robotics.nxt)
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