[Lazarus] Using 5dpo for serial comm...

[Bo Berglund]

On Thu, 07 Oct 2010 09:23:44 +0100, Lukasz Sokol <el.es.cr at gmail.com>
wrote:

>On 07/10/2010 06:01, Bo Berglund wrote:
>> On Thu, 07 Oct 2010 02:14:47 +0000, Mark Morgan Lloyd
>> <markMLl.lazarus at telemetry.co.uk> wrote:
>> 
>>>> If I now close the port with my button and then try to open it again
>>>> there is an exception that forces the program to end.
>>>
>>> Check port ownership, the groups the current user is in, and look at 
>>> dmesg output.
>>>
>> 
>> Hmm, what do you mean by that? Could you be more specific?
>> The current user is myself, there is no other account created on the
>> system and I am an admin.
>> And what is "dmesg output"?
>> 
>> 
>In virtual console, type 'ls -l /dev/ttyS*' will list all ttyS with permissions.
>
>like this :
>
>crw-rw---- 1 root dialout 4, 64 2010-04-12 09:17 /dev/ttyS0
>crw-rw---- 1 root dialout 4, 65 2010-04-12 09:17 /dev/ttyS1
>crw-rw---- 1 root dialout 4, 66 2010-04-12 09:17 /dev/ttyS2
>crw-rw---- 1 root dialout 4, 67 2010-04-12 09:17 /dev/ttyS3
>
>(this is from actual Ubuntu machine, under 8.10).
>
>This shows you that root owns all these ports, and dialout group
>is allowed to use it too, no others (man chmod).
>
>So to get your port working, you need to change your user group (add the username
>to group dialout in /etc/group file), then log out and log in again.
>
>Or you can, for quick look, start your app under gksudo; 
>
>Dmesg output appears on console if you type 'dmesg' or you can view it
>as saved to /var/log/dmesg (it lists a whole lot of kernel startup messages).
>

Looks the same on mine:
crw-rw---- 1 root dialout 4, 64 2010-10-07 11:40 /dev/ttyS0
crw-rw---- 1 root dialout 4, 65 2010-10-06 11:00 /dev/ttyS1
crw-rw---- 1 root dialout 4, 66 2010-10-06 11:00 /dev/ttyS2
crw-rw---- 1 root dialout 4, 67 2010-10-06 11:00 /dev/ttyS3

So I opened /etc/group in gedit and looked for dialout, my login was
already listed:
dialout:x:20:bosse

Using dmesg resulted in a lot of text, too much to show here. 
In fact, what am I looking for in the dmesg output???


-- 
Bo Berglund
Developer in Sweden