Re: file descriptor of a serial port

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

On 2018-08-20 21:10, jan.de.kruyf@gmail.com wrote:
> On Monday, August 20, 2018 at 6:36:31 PM UTC+2, Dmitry A. Kazakov wrote:
>> On 2018-08-20 16:33, jan......com wrote:
>>> On Monday, August 20, 2018 at 4:21:20 PM UTC+2, J-P. Rosen wrote:
>>>> Le 20/08/2018 à 15:56, jan.....com a écrit :
>>>>> Hallo,
>>>>>
>>>>> I try to set up a custom baudrate on a serial port, which I believe
>>>>> is done with the C ioctl procedure.
>>>>>
>>>> GNAT.Serial_Communications has a Set procedure to set various
>>>> parameters, including baud rate. No need to play with the low level.
>>>>
>>>> -- 
>>>> J-P. Rosen
>>>> Adalog
>>>> 2 rue du Docteur Lombard, 92441 Issy-les-Moulineaux CEDEX
>>>> Tel: +33 1 45 29 21 52, Fax: +33 1 45 29 25 00
>>>> http://www.adalog.fr
>>>
>>> Pity, does not work.
>>
>> How do you know it does not? The call goes right to the OS, at least
>> under Windows. There is little one could do wrong or differently to the
>> GNAT implementation.
>>
>> Maybe the settings you are using are incorrect or the way you are
>> reading from the port.

E.g. depending on the settings and how poorly the other party was 
designed, which quite frequently quite poorly, you must be always 
reading the next byte from the COM port in order to prevent deadlock. 
Sometimes you have to read out all garbage before sending anything to 
the other side etc.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de