NXT Firmware Hacking : 40


Robotics / NXT / NXT Firmware Hacking / 40	39 \| 41

Subject:	Re: Using NXT Port 4 EIA-485
Newsgroups:	lugnet.robotics.nxt, lugnet.robotics.nxt.nxthacking
Date:	Tue, 10 Apr 2007 10:16:25 GMT
Viewed:	150 times

Hi Christian, "Christian Mock" <chrimo-@-moccy.xdsnet.de> writes: > > My problem is the bitrate of 921,6 kbits/s. > Simple cheap MCU like ATMega didn't support this bitrate (as far as I know). the RS-485 interface is directly connected to the AT91SAM7S USART, so you can choose the bit rate quite freely. > To add an external devices (e.g MCU+SD-Card or MCU+serial camera ) to NXT, > it seems to be neccessary to implement the P-Net-Protocol > (http://www.p-net.org). > Is this protocol allways used when using Port4 highspeed communication ? No, it is not necessary, P-Net is just a field bus which seems to be popular in Denmark, there are others which can be used with RS-485. Any of these protocols based on RS-485 should be possible with the NXT. JÃ¼rgen -- JÃ¼rgen Stuber <juergen@jstuber.net> http://www.jstuber.net/ gnupg key fingerprint = 2767 CA3C 5680 58BA 9A91 23D9 BED6 9A7A AF9E 68B4

Message has 1 Reply:

		Re: Using NXT Port 4 EIA-485
(...) Hi Juergen, Yes, I found this night the entries at Lego-Source-Code... and no line about P-NET-Protocol... My first thought was to implement a simple p-net-node at own MCU, but now I can try my own communication from NXT (master) to external (...) (18 years ago, 10-Apr-07, to lugnet.robotics.nxt, lugnet.robotics.nxt.nxthacking)

Message is in Reply To:

		Re: Using NXT Port 4 EIA-485
(...) Hi, halfduplex is not the problem when connecting the NXT to an external MCU. My problem is the bitrate of 921,6 kbits/s. Simple cheap MCU like ATMega didn't support this bitrate (as far as I know). To add an external devices (e.g MCU+SD-Card (...) (18 years ago, 9-Apr-07, to lugnet.robotics.nxt, lugnet.robotics.nxt.nxthacking)

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