Thread: Masking(or ...)

hi all,


I am currently doing some embedded programming on microcontroller. What i don't understand is how do i test a pin in a particular port if it is high or low in C?
lets say i want to see if port A pin 1 is high. can i use masking? How does masking is used actually?

lets say i have

Code:

porrtAmask = 2 ;    //00000010

if i use

Code:

if(mask & portregister);    //portregister is the place where MCU  
                                         //keeps the data

I know that AND will only result 1 if both is but will it tell me that port A pin 1 is high?


00000010-----portAmask
00000010-----portregister
--------------
00000010 ==> this is 0x02H

so how the if loops above works?

r u trying to say that the data in the portregister automatically implies that it has come from portA?
i dont think that is true.

It should be PortDataRegister.this should be data latch on the port.

how many pins r included in the port? is that a serial or parallel port?

> r u trying
Please try and use "you" and "are"
This cryptic language is irritating enough for native speakers, nevermind all the people who use English as a foreign language.