Reading from pl2303 (GPS-Receiver) fails - maemo.org

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ChickenMcNugget	2007-12-13 , 15:24
Posts: 12 \| Thanked: 3 times \| Joined on Mar 2007	#1

Hi there,

its some time ago when I first asked that question:
http://www.internettablettalk.com/fo...ghlight=pl2303

But since noone was able to answer that question within the troubleshooting-sub-forum I'll try again here. The second reason for re-asking is the new OS I installed some days ago: OS2007HE

I flashed my device to HostMode again and it notices my gps receiver as pl2303 mapped to /dev/ttyUSB0:

Code:

[  188.581115] USB cable connected
[  188.984527] usb 1-1: new full speed USB device using ohci and address 6
[  189.222259] usb 1-1: device v067b p2303 is not supported
[  189.224304] usb 1-1: configuration #1 chosen from 1 choice
[  189.226745] pl2303 1-1:1.0: pl2303 converter detected
[  189.227294] usb 1-1: pl2303 converter now attached to ttyUSB0
Nokia-770-36:~# stty
speed 38400 baud;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V;
flush = ^O; min = 1; time = 0;
-brkint -imaxbel
Nokia-770-36:~# stty speed 4800 /ttyUSB0
38400
Nokia-770-36:~# stty speed 4800 ttyUSB0
4800
Nokia-770-36:~# stty
speed 4800 baud;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V;
flush = ^O; min = 1; time = 0;
-brkint -imaxbel
Nokia-770-36:~# cat /dev/tty
/dev/tty      /dev/tty14    /dev/tty20    /dev/tty27    /dev/tty33    /dev/tty4     /dev/tty46    /dev/tty52    /dev/tty59    /dev/tty8
/dev/tty0     /dev/tty15    /dev/tty21    /dev/tty28    /dev/tty34    /dev/tty40    /dev/tty47    /dev/tty53    /dev/tty6     /dev/tty9
/dev/tty1     /dev/tty16    /dev/tty22    /dev/tty29    /dev/tty35    /dev/tty41    /dev/tty48    /dev/tty54    /dev/tty60    /dev/ttyS0
/dev/tty10    /dev/tty17    /dev/tty23    /dev/tty3     /dev/tty36    /dev/tty42    /dev/tty49    /dev/tty55    /dev/tty61    /dev/ttyS1
/dev/tty11    /dev/tty18    /dev/tty24    /dev/tty30    /dev/tty37    /dev/tty43    /dev/tty5     /dev/tty56    /dev/tty62    /dev/ttyS2
/dev/tty12    /dev/tty19    /dev/tty25    /dev/tty31    /dev/tty38    /dev/tty44    /dev/tty50    /dev/tty57    /dev/tty63    /dev/ttyS3
/dev/tty13    /dev/tty2     /dev/tty26    /dev/tty32    /dev/tty39    /dev/tty45    /dev/tty51    /dev/tty58    /dev/tty7     /dev/ttyUSB0
Nokia-770-36:~# cat /dev/ttyUSB0

I really want to get that working. I read a little through the forums and some say that the pl2303 has to work right from the start and that almost any usb2serial converter just works fine. I'm wondering why this fails.

I can open the serial port. I can set it to 4800 baud. When I try to cat it to the console I just get nothing. On my laptop it works perfectly with the same commands.

Does anyone has an idea what might be the problem?

Thank you for reading,
Timo

EDIT: Ok, I must add that Ubuntu doesn't know about the stty speed option, so I needed to use minicom to get a working serial output. But anyway, it works under Ubuntu.

ANOTHER EDIT: I downloaded this driver packege but replacing every installed module by the ones under ../usb/serial doesn't help.

Last edited by ChickenMcNugget; 2007-12-13 at 16:04.

Quote & Reply |

lardman	2007-12-14 , 09:12
Posts: 2,102 \| Thanked: 1,309 times \| Joined on Sep 2006	#2

So, does minicom work on your 770 then?

Quote & Reply |

ChickenMcNugget	2007-12-14 , 09:49
Posts: 12 \| Thanked: 3 times \| Joined on Mar 2007	#3

Not jet, but I hope to get it working this afternoon.

But I guess, that it won't work eighter, because MaemoMapper cannot read the gps signal. We will see, hopefully