Cannot open serial device /dev/ttyUSB0

George Andguladze gandguladze at hotmail.com
Tue Jun 4 17:40:35 UTC 2013


Cannot open serial device /dev/ttyUSB0

I am getting this error message when I try to connect to my C155 phone and upload hello_world.compalram.bin using this command:

./osmocon -p /dev/ttyUSB0 -m c155 ../../target/firmware/board/compal_e99/hello_world.compalram.bin

Even though device ttyUSB0 exists in my /dev/ directory, and I have set modprobe cp210x, and chmod 777 /dev/ttyUSB0.
Here is an output from dmesg:

[  105.110818] usb 6-3: USB disconnect, device number 2
[  105.111098] cp210x ttyUSB0: cp210x converter now disconnected from ttyUSB0
[  105.111131] cp210x 6-3:1.0: device disconnected
[  113.728075] usb 6-3: new full speed USB device number 3 using ohci_hcd
[  113.901042] cp210x 6-3:1.0: cp210x converter detected
[  114.040085] usb 6-3: reset full speed USB device number 3 using ohci_hcd
[  114.206030] usb 6-3: cp210x converter now attached to ttyUSB0

Here is an output from ls -l /dev/tty :

crw-rw-rw- 1 root tty       5,  0 2013-06-04 21:27 /dev/tty
crw--w---- 1 root tty       4,  0 2013-06-04 20:40 /dev/tty0
crw------- 1 root root      4,  1 2013-06-04 20:40 /dev/tty1
crw--w---- 1 root tty       4, 10 2013-06-04 20:40 /dev/tty10
crw--w---- 1 root tty       4, 11 2013-06-04 20:40 /dev/tty11
crw--w---- 1 root tty       4, 12 2013-06-04 20:40 /dev/tty12
crw--w---- 1 root tty       4, 13 2013-06-04 20:40 /dev/tty13
crw--w---- 1 root tty       4, 14 2013-06-04 20:40 /dev/tty14
crw--w---- 1 root tty       4, 15 2013-06-04 20:40 /dev/tty15
crw--w---- 1 root tty       4, 16 2013-06-04 20:40 /dev/tty16
crw--w---- 1 root tty       4, 17 2013-06-04 20:40 /dev/tty17
crw--w---- 1 root tty       4, 18 2013-06-04 20:40 /dev/tty18
crw--w---- 1 root tty       4, 19 2013-06-04 20:40 /dev/tty19
crw------- 1 root root      4,  2 2013-06-04 20:40 /dev/tty2
crw--w---- 1 root tty       4, 20 2013-06-04 20:40 /dev/tty20
crw--w---- 1 root tty       4, 21 2013-06-04 20:40 /dev/tty21
crw--w---- 1 root tty       4, 22 2013-06-04 20:40 /dev/tty22
crw--w---- 1 root tty       4, 23 2013-06-04 20:40 /dev/tty23
crw--w---- 1 root tty       4, 24 2013-06-04 20:40 /dev/tty24
crw--w---- 1 root tty       4, 25 2013-06-04 20:40 /dev/tty25
crw--w---- 1 root tty       4, 26 2013-06-04 20:40 /dev/tty26
crw--w---- 1 root tty       4, 27 2013-06-04 20:40 /dev/tty27
crw--w---- 1 root tty       4, 28 2013-06-04 20:40 /dev/tty28
crw--w---- 1 root tty       4, 29 2013-06-04 20:40 /dev/tty29
crw------- 1 root root      4,  3 2013-06-04 20:40 /dev/tty3
crw--w---- 1 root tty       4, 30 2013-06-04 20:40 /dev/tty30
crw--w---- 1 root tty       4, 31 2013-06-04 20:40 /dev/tty31
crw--w---- 1 root tty       4, 32 2013-06-04 20:40 /dev/tty32
crw--w---- 1 root tty       4, 33 2013-06-04 20:40 /dev/tty33
crw--w---- 1 root tty       4, 34 2013-06-04 20:40 /dev/tty34
crw--w---- 1 root tty       4, 35 2013-06-04 20:40 /dev/tty35
crw--w---- 1 root tty       4, 36 2013-06-04 20:40 /dev/tty36
crw--w---- 1 root tty       4, 37 2013-06-04 20:40 /dev/tty37
crw--w---- 1 root tty       4, 38 2013-06-04 20:40 /dev/tty38
crw--w---- 1 root tty       4, 39 2013-06-04 20:40 /dev/tty39
crw------- 1 root root      4,  4 2013-06-04 20:40 /dev/tty4
crw--w---- 1 root tty       4, 40 2013-06-04 20:40 /dev/tty40
crw--w---- 1 root tty       4, 41 2013-06-04 20:40 /dev/tty41
crw--w---- 1 root tty       4, 42 2013-06-04 20:40 /dev/tty42
crw--w---- 1 root tty       4, 43 2013-06-04 20:40 /dev/tty43
crw--w---- 1 root tty       4, 44 2013-06-04 20:40 /dev/tty44
crw--w---- 1 root tty       4, 45 2013-06-04 20:40 /dev/tty45
crw--w---- 1 root tty       4, 46 2013-06-04 20:40 /dev/tty46
crw--w---- 1 root tty       4, 47 2013-06-04 20:40 /dev/tty47
crw--w---- 1 root tty       4, 48 2013-06-04 20:40 /dev/tty48
crw--w---- 1 root tty       4, 49 2013-06-04 20:40 /dev/tty49
crw------- 1 root root      4,  5 2013-06-04 20:40 /dev/tty5
crw--w---- 1 root tty       4, 50 2013-06-04 20:40 /dev/tty50
crw--w---- 1 root tty       4, 51 2013-06-04 20:40 /dev/tty51
crw--w---- 1 root tty       4, 52 2013-06-04 20:40 /dev/tty52
crw--w---- 1 root tty       4, 53 2013-06-04 20:40 /dev/tty53
crw--w---- 1 root tty       4, 54 2013-06-04 20:40 /dev/tty54
crw--w---- 1 root tty       4, 55 2013-06-04 20:40 /dev/tty55
crw--w---- 1 root tty       4, 56 2013-06-04 20:40 /dev/tty56
crw--w---- 1 root tty       4, 57 2013-06-04 20:40 /dev/tty57
crw--w---- 1 root tty       4, 58 2013-06-04 20:40 /dev/tty58
crw--w---- 1 root tty       4, 59 2013-06-04 20:40 /dev/tty59
crw------- 1 root root      4,  6 2013-06-04 20:40 /dev/tty6
crw--w---- 1 root tty       4, 60 2013-06-04 20:40 /dev/tty60
crw--w---- 1 root tty       4, 61 2013-06-04 20:40 /dev/tty61
crw--w---- 1 root tty       4, 62 2013-06-04 20:40 /dev/tty62
crw--w---- 1 root tty       4, 63 2013-06-04 20:40 /dev/tty63
crw--w---- 1 root tty       4,  7 2013-06-04 20:40 /dev/tty7
crw--w---- 1 root tty       4,  8 2013-06-04 20:40 /dev/tty8
crw--w---- 1 root tty       4,  9 2013-06-04 20:40 /dev/tty9
crw------- 1 root root      5,  3 2013-06-04 20:40 /dev/ttyprintk
crw-rw---- 1 root dialout   4, 64 2013-06-04 20:40 /dev/ttyS0
crw-rw---- 1 root dialout   4, 65 2013-06-04 20:40 /dev/ttyS1
crw-rw---- 1 root dialout   4, 74 2013-06-04 20:40 /dev/ttyS10
crw-rw---- 1 root dialout   4, 75 2013-06-04 20:40 /dev/ttyS11
crw-rw---- 1 root dialout   4, 76 2013-06-04 20:40 /dev/ttyS12
crw-rw---- 1 root dialout   4, 77 2013-06-04 20:40 /dev/ttyS13
crw-rw---- 1 root dialout   4, 78 2013-06-04 20:40 /dev/ttyS14
crw-rw---- 1 root dialout   4, 79 2013-06-04 20:40 /dev/ttyS15
crw-rw---- 1 root dialout   4, 80 2013-06-04 20:40 /dev/ttyS16
crw-rw---- 1 root dialout   4, 81 2013-06-04 20:40 /dev/ttyS17
crw-rw---- 1 root dialout   4, 82 2013-06-04 20:40 /dev/ttyS18
crw-rw---- 1 root dialout   4, 83 2013-06-04 20:40 /dev/ttyS19
crw-rw---- 1 root dialout   4, 66 2013-06-04 20:40 /dev/ttyS2
crw-rw---- 1 root dialout   4, 84 2013-06-04 20:40 /dev/ttyS20
crw-rw---- 1 root dialout   4, 85 2013-06-04 20:40 /dev/ttyS21
crw-rw---- 1 root dialout   4, 86 2013-06-04 20:40 /dev/ttyS22
crw-rw---- 1 root dialout   4, 87 2013-06-04 20:40 /dev/ttyS23
crw-rw---- 1 root dialout   4, 88 2013-06-04 20:40 /dev/ttyS24
crw-rw---- 1 root dialout   4, 89 2013-06-04 20:40 /dev/ttyS25
crw-rw---- 1 root dialout   4, 90 2013-06-04 20:40 /dev/ttyS26
crw-rw---- 1 root dialout   4, 91 2013-06-04 20:40 /dev/ttyS27
crw-rw---- 1 root dialout   4, 92 2013-06-04 20:40 /dev/ttyS28
crw-rw---- 1 root dialout   4, 93 2013-06-04 20:40 /dev/ttyS29
crw-rw---- 1 root dialout   4, 67 2013-06-04 20:40 /dev/ttyS3
crw-rw---- 1 root dialout   4, 94 2013-06-04 20:40 /dev/ttyS30
crw-rw---- 1 root dialout   4, 95 2013-06-04 20:40 /dev/ttyS31
crw-rw---- 1 root dialout   4, 68 2013-06-04 20:40 /dev/ttyS4
crw-rw---- 1 root dialout   4, 69 2013-06-04 20:40 /dev/ttyS5
crw-rw---- 1 root dialout   4, 70 2013-06-04 20:40 /dev/ttyS6
crw-rw---- 1 root dialout   4, 71 2013-06-04 20:40 /dev/ttyS7
crw-rw---- 1 root dialout   4, 72 2013-06-04 20:40 /dev/ttyS8
crw-rw---- 1 root dialout   4, 73 2013-06-04 20:40 /dev/ttyS9
crwxrwxrwx 1 root dialout 188,  0 2013-06-04 21:07 /dev/ttyUSB0


What is it that I am doing wrong?


Thanks,
George
 		 	   		  
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