Hi Greg,
What kernel version is this?
>>>kernel - 3..4.14 ported on ARM custom board.
Are there any kernel logs showing any errors?
>> no error log showing
>> we are just waiting for '#' prompt using chat command and comparing the result and printing "OK" in success case and "ERROR" in failure
>> Command :
# usb-serial test sub-shell
(
stty -F /dev/ttyUSB0 115200 -echo -echoe -echok -onlcr -icrnl
exec >/dev/ttyUSB0
exec </dev/ttyUSB0
chat ' ' ls '#'
)
result=$?
if [ $result -ne 0 ] ; then
echo "ERROR"
exit 1
else
echo "OK"
fi
What flow control have you set for this serial port?
>>> no flow control is used
Thanks
Shishir
On Tue, Jun 14, 2016 at 9:17 PM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
> On Tue, Jun 14, 2016 at 08:27:30PM +0530, shishir tiwari wrote:
>> Hi ,
>>
>> We are trying to open and close ttyUSB0 port and using 'chat' command
>> to communicate in while loop using shell script.but after 30-40 times
>> '#' reply is not coming for 'ls' command.
>>
>> shell script::
>> while
>> (
>> stty -F /dev/ttyUSB0 115200 -echo
>> exec > /dev/ttyUSB0
>> exec < /dev/ttyUSB0
>> chat '' ls '#'
>> )
>> result =$?
>>
>> platform : custom
>> serial driver : pl2303
>> host controller :xhci
>
> What kernel version is this? Are there any kernel logs showing any
> errors? What flow control have you set for this serial port?
>
> thanks,
>
> greg k-h
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