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how to "writePin()"function? [message #1778931]

Sun, 24 December 2017 21:46

Eclipse User

hi,
writePin() function,can be found in QX fb. I can't figure out that how does this function work. Which param. decide the result of writePin() output hight or low
on real GPIO_Pin?

Re: how to "writePin()"function? [message #1778934 is a reply to message #1778931]

Mon, 25 December 2017 04:01

Eclipse User

Hi,

you must have a processinterface like "sysfs"
Add this on your CMake...
sysfs write/read on GPIO Pins (QX, IX).

Or you make a own interface.
For a own is easiest to copy sysfs,
but note that sysfs only include IX and QX on CMakeList.

Attachment: sysfs.PNG
(Size: 39.54KB, Downloaded 95 times)

Re: how to "writePin()"function? [message #1778966 is a reply to message #1778931]

Tue, 26 December 2017 16:44

Eclipse User

hi,

the class CProcessInterface which is requird to implement the writePin function is in the used pattern a parent of QX, IX, IW, QW. As such it has access to all inputs and outputs of the FBs. The typical implementation is to use the params input in the initialize function for setting up anything needed and in the write and read function use this information to perform the action. The return value should always indicate if reading or writing succeeded.

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