GPIO input/output modes - what's the difference?

[morpeh89]

Posted on November 17, 2010 at 08:37

GPIO input/output modes - what's the difference?

[Andrew Neil]

Posted on May 17, 2011 at 14:15

''physics, such as resistors/transistors in schematics, is not very interesting now''

  Unfortunately, those are precisely the things that are key to understanding this! This is one of the key differences between embedded development - especially small microcontroller embedded development - and, say, PC development. Do you understand what ''Pull-Up'', ''Pull-Down'', ''Push-Pull'' and ''Open Drain'' mean in general terms? These are very widespread and general terms - not at all specific to ST or the STM32.

http://en.wikipedia.org/wiki/Pull-up_resistor

http://en.wikipedia.org/wiki/Push-pull_output

http://en.wikipedia.org/wiki/Open_drain

  (equivalent to ''Open Collector'')

[Andrew Neil]

Posted on May 17, 2011 at 14:15

See also: 

http://www.8052.com/forumchat/read/142019

[Andrew Neil]

Posted on May 17, 2011 at 14:15

''studying is inevitable''

Yes, of course - if you want (or need) to do it yourself. But if you don't have the expertise, and are not interested in gaining it, then you can always hire someone to do it for you:

http://www.st.com/internet/mcu/design_contacts/design_consultants.jsp

[morpeh89]

Posted on May 17, 2011 at 14:15

OK, thanks.

I guessed, that studying is inevitable :)