what does the F() function in the source do?

[tooblippe]

what does the F() function in the source do?

i cant seem to find the declaration

thank you

[NietGiftig]

http://playground.arduino.cc/Learning/Memory

[costo]

Look in this link at the bottom of the page

http://playground.arduino.cc/Learning/Memory

[tooblippe]

Thank you for the responses. Learning somethign new every day.

[Drum]

Is this something to be concerned about with respect to http://www.esp8266.nu/forum/viewtopic.php?f=2&t=1988 ?

[costo]

Is this something to be concerned about with respect to http://www.esp8266.nu/forum/viewtopic.php?f=2&t=1988 ?

I think it is not , because the F() function is used only during compilation, strings are written in Flash/(program storage space) once and stay there unchanged until next compilation/flash. Without the F() function strings are used as global variables and written in flash but also copies are stored in the ram/(dynamic memory) which is more scarcely than flash memory in the ESP8266 as well as in the AVR chips of Arduino boards.