RoboSavvy Forum

Serial communication through gumstix

2009-11-25T00:27:38+01:00

Hi,

0x0A turning into a 0x0D, 0x0A ... That sounds like a conversion from /n to /r/n.

Would you be sending data from a Windows machine?
If so check the options you open your COM port with. /n converted to /r/n is the typical things you have when you write into files in Microsoft OSes, and that is why the "b" exists in fopen( "file", "wb" ) when you want to write non-text data.

I hope this helps.

Stéphane

Statistics: Posted by Stephane — Wed Nov 25, 2009 12:27 am

Serial communication through gumstix

2009-11-24T19:31:25+01:00

I analyzed the signals from serial port of gumstix through Logic Analyzer (www.saleae.com) and calculated the baud to be 1Mbps, so serial port of gumstix is definitely reaching 1Mbps.

Statistics: Posted by NEVER — Tue Nov 24, 2009 7:31 pm

Serial communication through gumstix

2009-11-24T12:54:05+01:00

i even tried lesser bauds, but no difference. Packets without 0a work fine but wherever a 0a packet is sent, packet received at the other end becomes 0d 0a....
?????

Statistics: Posted by NEVER — Tue Nov 24, 2009 12:54 pm

Serial communication through gumstix

2009-11-24T00:48:31+01:00

gumstix built in serial ports do not resolve to 1Mbps, the closest I think is 921kbps but that is not close enough. I use gumstix for my robots but I use a USB ftdi module to get 1Mbps RS485.

Statistics: Posted by Bullit — Tue Nov 24, 2009 12:48 am

Serial communication through gumstix

2009-11-23T23:40:19+01:00

1 Mbps

Statistics: Posted by NEVER — Mon Nov 23, 2009 11:40 pm

Serial communication through gumstix

2009-11-23T22:13:20+01:00

What baud rate are you communicating at?

Statistics: Posted by Bullit — Mon Nov 23, 2009 10:13 pm

Serial communication through gumstix

2009-11-23T17:48:15+01:00

I am sending data packets through the gumstix serial port(using a c program) to an rx64 motor.
When i send a data '0a'(in hex) the data received at the other end is actually 0d 0a (checked by a USBDynamixel).
Also, i am using a max485 chip to convert rx/tx data to rs485 standard.

Statistics: Posted by NEVER — Mon Nov 23, 2009 5:48 pm