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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Mon, 9 Apr 2007 11:58:27 GMT
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Viewed:
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19835 times
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In lugnet.robotics.nxt, John Hansen wrote:
> In lugnet.robotics.nxt, John Barnes wrote:
> > In lugnet.robotics.nxt, Christian Mock wrote:
> > > Hi,
> > > is there currently any software-support (pbLua, NXT-G, NXJ) for NXT Port4
> > > highspeed serial communication (EIA-485) ?
> > > Thanks for more informations
> > > Christian
> >
> > As far as I know, there isn't any support for this interface in either the
> > standard firmware or any of the other third party firmware implementations.
> >
> > The interface runs at 921,600 bps so it will be fast enough to be really useful.
> > I am hoping that, eventually, it will be supported.
>
>
> What is not supported about this port in the standard NXT firmware? You can
> read from it and write to it using the IOMapRead and IOMapWrite syscall
> functions. Looking at the firmware source code it certainly looks like
> everything is setup to work properly where if you write to the HSOutBuf and
> properly set the HsState and HsFlags values that it will send data and receive
> data into the HSInBuf. What sort of additional support is needed to make this
> interface (more) useable?
>
> John Hansen
Do you think it is possible to read/write binary and ascii data to this device
or is there a special protocol neccessary ?
What about bitrate of EIA-485 device ? Is it possible to adjust bitrate to
anything more usable (9600, 38400, 115200) ? When interfacing a standard UART
(e.g AVR MCU with internal UART) it is neccessary to support more "standard"
bitrates which can be derived from MCU clock (8-16 MHz)...
Christian
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Message is in Reply To:
 | | Re: Using NXT Port 4 EIA-485
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| (...) What is not supported about this port in the standard NXT firmware? You can read from it and write to it using the IOMapRead and IOMapWrite syscall functions. Looking at the firmware source code it certainly looks like everything is setup to (...) (18 years ago, 9-Apr-07, to lugnet.robotics.nxt)
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