hii
i have mu own custom board for arduino and lets say i want to use pins of port E
PE7, PE4
now in the file pins_arduino.h
pins_arduino.h i can see that pin PE4 can be defined as pin number 2 but where i can find the pin number for PE7 , it is not defined in the pins_arduino.h!!
i need the number for PE7 to declare my own define in my code
i be glad for help
And which processor are you using for this custom board ?
hii atmega2560 
Assuming you are using an Atmega2560 as used on the Mega, PE7 is not connected, so there would be no need for a reference in the pins_arduino.h file.
See the schematic https://www.arduino.cc/en/uploads/Main/arduino-mega2560-schematic.pdf
your would need information:
what chip is used in your case
what CPU frequency is used
If it matches any "standard" arduino board just use table Ardino<-> port & pin number table from the "standard" board documentation
Try Megacore, that supports all the pins on the 2560.
hii thanks , but for example if i wand to use PE7 to read an digital input how do i use this pins
lets say for PE4 in setup i can use something like
pinMode(2, INPUT);
and
digitalRead(2); to read the pin
how can i do the same for PE7
You need to make a custom board support package and create your own pins_arduino.h
do you have an example for custom board package that can illustrate the point,thanks
No I do not, maybe another forum menber has one.
atmega2560
see the existed board definitions in the megacore as an example