> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Glenn Dawson > Sent: Monday, 5 September 2005 5:19 PM > To: Paul Hamilton; freebsd-questions@freebsd.org > Subject: Re: Serial Port data dumping program > > > At 01:08 AM 9/5/2005, Paul Hamilton wrote: > >Hi, > > > >I am trying to debug a Mini SSC FreeBSD program that I am trying to > >write. It would be nice to be able to be able to see what is being > >transmitted. It would help in the debugging of my program. > > > >Here is a link to a Windows based Mini SSC program: > >http://www.rentron.com/Mini-ssc.htm Using this, I can control the > >servo, so I know the hardware and cables work etc. > > > >I have been using the 'minicom' port to dump the received data. > >However, it doesn't seem to collect the data properly. Data > coming in > >should be in accordance with the SSC protocol, ie: > > > >byte 1: 0xFF // sync byte > > > >byte 2: 0x01 - 0x25f //servo address > > How do you fit 0x25f into a single byte? (I count 10 bits required) >
Yep, a typo, should have been: 0xff > > >byte 3: 0x00 - 0x255 // servo position > > Same question as above. Brain thinking in hex, fingers working in decimal ;-) > > > >Here is a dump of the collected data (via minicom): > > > >#hexdump minicom.cap > >0000000 45ff 49ff 4cff 50ff 53ff 57ff 5aff 57ff > >0000010 53ff 50ff 4cff 49ff 45ff 45ff 01ff ff82 > >0000020 8101 01ff ff80 8202 02ff ff81 8002 03ff > >0000030 ff83 8203 03ff ff81 8003 7fff 7fff 7eff > >0000040 01ff ff7f 7f02 03ff ff7f ff7f 8001 02ff > >0000050 ff80 8003 04ff ff80 ff80 8006 07ff 0080 > > > >Looking at the first row of data, it is only showing two bytes, sync > >and servo position. Rows 020 and 030, shows some servo > addresses, but > >sometimes, together! Both the mini-ssc.exe and minicom program are > >using 9600 8n1, so why is it showing this? Is there > something I have > >missed in the setup of minicom? Looks like this is a serial buffer > >problem. > > You probably have byte ordering issues. Does something like this > look more reasonable? > > 0000000 ff45 ff49 ff4c ff50 ff53 ff57 ff5a ff57 > 0000010 ff53 ff50 ff4c ff49 ff45 ff45 ff01 82ff > 0000020 0181 ff01 80ff 0282 ff02 81ff 0280 ff03 > 0000030 83ff 0382 ff03 81ff 0380 ff7f ff7f ff7e > 0000040 ff01 7fff 027f ff03 7fff 7fff 0180 ff02 > 0000050 80ff 0380 ff04 80ff 80ff 0680 ff07 8000 > > -Glenn Yes, somewhat better, but still missing bytes here and there, ie. First line, all the servo address bytes etc. Why would the bytes be swapped around? Cheers, Paul > > > >Is there a better program I could use to display the incoming serial > >data in hex? > > > >NOTE: I only use two wires, signal ground and Tx Data (connected to > >the Rx Data). The servo does respond correctly, so I know > the serial > >data must be in the correct 3 byte format. > > > >Looking fwd to your thoughts. > > > >Cheers, > > > >Paul Hamilton > > > >_______________________________________________ > >freebsd-questions@freebsd.org mailing list > >http://lists.freebsd.org/mailman/listinfo/freebsd-questions > >To unsubscribe, send any mail to > >"[EMAIL PROTECTED]" > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "[EMAIL PROTECTED]" > > _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"