[Development] New Module for Serial Buses

Oikarinen Johannes johannes.oikarinen at theqtcompany.com
Thu May 28 19:45:02 CEST 2015

> On 28 May 2015, at 18:16, Frederik Gladhorn <frederik.gladhorn at theqtcompany.com> wrote:
>> On Thursday, May 28, 2015 01:35:17 PM Marc Mutz wrote:
>>> On Tuesday 26 May 2015 15:33:59 Viironen Kalle wrote:
>>> For naming we have thought either QtBus or QtSerialBus. IMO name as such
>>> should already on it’s own describe the generalised idea of the module.
>> What use-case do you have in mind where the programmer doesn't know that
>> he's talking to a CAN bus? Or an i2c one? Or, for that matter, to a KNX
>> bus?
>> Sure, there are apps that generically will talk to any bus as long as
>> there's a Qt plugin for it, but those apps should implement the abstraction
>> layer themselves, as fits their needs.
>> Please don't overengineer this. If this is about CAN, call it QtCanBus. If
>> it's about i2c, call it QtI2cBus. These are separate libraries. You get the
>> idea. This is not like the web (ftp, http, ...) where there's an established
>> abstraction (URLs) and the vast majority of applications shouldn't care
>> about the actual protocol underlying a URL (thus, QNAM is ok, even though I
>> note that it loses functionality compared to QHttp, just as QHostInfo lost
>> functionality compared to QDns).
>> I don't know about CAN, but taking KNX as an example I know well, you want
>> (preferably static, as opposed to type-erased) access to the KNX data
>> formats and group addresses. Yes, all the way up to QML, not just C++.
> My understanding is that the goal is to be able to share code, in the end we 
> should still end up with several classes handling specific buses, but also a 
> shared repository and not re-inventing all of the implementations from scratch 
> for each new bus type.
> Cheers,
> Frederik

 At first the QtSerialport could be moved under QtBus module and built from there (in same fashion as QtPim) as is to keep binary compatibility. 

I haven't looked the implementation specifics of QtSerialport, but later it could be moved directly under QtBus changed to use plugin backends, while still offering several bus specific classes, as Frederik stated.


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