hi guys
im doing a project with arduino Mega 2560
as u know masters 6 external interrupt (2,3,18,19,20,21)
i wanted to use 4 of them
but the problem is :
***i must use either i2c communication and 3.5 inch tft lcd
the SDA and SCL pins in i2c communication are 20 and 21 . this means i cant use them for interrupt
the lcd use a lot of pins include 2 and 3 pins
so i have 2 pin that free for using as External interrupt (18,19) and i need 4
any way ? 8)
any solution? 8)
2 (failed) IDIA
i tried soft i2c library to use another pins for SCL and SDA but not worked....
can i change the lcd library to use another pins (instad 2,3)?? if yes , HOW?
thanks...
the lcd use a lot of pins include 2 and 3 pins
The LCD may use a lot of pins, but they do NOT have to include 2 and 3.
can i change the lcd library to use another pins (instad 2,3)??
Which LCD library??
(Do all the ? ? ? ? ? ? ? ? ? ? ? contribute a thing?)
ONE is sufficient.
In general, the pins that an LCD uses are defined when the constructor is called. The pins are not hardcoded in the library.
And why do you think you need interrupts?
The question about pins shows us you're a beginner and they tend to have a wrong idea when to use a interrupt... So I'm willing to bed you don't need an interrupt.
im sorry for noobs question...
aliali6624:
i used UTFT library
aliali6624:
this is exactly my question
how can i change the library and use two other pin , instead 2 , 3 pins .
so i can use them for Interrupt...
im biginer in Arduino but EXPERT in C++ and im shure that i need interrupt
Then I'll wish good luck with your super secret mission! Because apparently you don't want to share the details...
i used UTFT library
But I'm not going to provide a link to it, or to the LCD...
This question:
how can i change the library and use two other pin , instead 2 , 3 pins .
and this statement
EXPERT in C++
are contradictory.
If you are an EXPERT, surely you know how to look at the call to the library function and decide where all the pins being used by the hardware are being communicated in the call to the constructor, in which case just change the pins actually used and the call to the constructor.
If a change to the library is needed, surely you know how to fire up a text editor and start typing.
aliali6624:
My wild guess is that you never needed to use an interrupt when programming a PC using C++ so what makes you think you need one for an Arduino?
Tell us what you project is and you will get much more useful assistance.
...R
lets forget about not useless Contention
and focus in the main question
please forget about interrupt
my project is not a secret or something else .... but im not describe it because its really not Necessary
its just confuse u... and not relay on my problem .
so Summary
normally when we attach a standard shield (like an LCD )to a board (like mega 2560 r3), the shield takes
some pins of the board . i want to change two of this pins in hardware .
in fact i want to connect 2 pin of lcd shield ( that normally attach to 2 and 3 pin of mega ) To any other pin ( like 8 , 9 pin of mega)
HOW TO CHANGE THE LIBRARY OF LCD SHIELD (software)??
i think this is a clear question and problem. that no need the library library
but as as i told, i used UTFT lib , 480*320 example
couka
May 27, 2016, 7:21am
9
Did you even look at the example sketches included in the utft library?
lg, couka
Robin2
May 27, 2016, 7:51am
10
aliali6624:
its just confuse u... and not relay on my problem .
On the contrary a clear description of the project helps us to understand the context and offer more sensible advice.
...R
Usually, the pin assignments are specified in the constructor or an initialization method.
Is your
enter
broken
because there are
some random line
breaks....
aliali6624:
That's what we like to call a XY problem
aliali6624:
This is exactly why details matter, you never told us it's a shield
aliali6624:
For a C expert that should take you 1 minute... Less now @aarg gave you a hint.
mega has 6 external interrupt (2,3,18,19,20,21)
:-[
