https://devzone.nordicsemi.com/f/nordic-q-a/75463/pca10056-board-definitionHi, I&#39;m using nrf52840 and trying to define the pin mappings for my custom board. In order to do this I&#39;m studying the board definition of pca10056 (pca10056.h). In that file I saw some definitions are mapped to single pin number, for exampleen-USTelligent Community 13Tue, 25 May 2021 12:03:27 GMThttps://devzone.nordicsemi.com/thread/311438?ContentTypeID=1Tue, 25 May 2021 12:03:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:df89ed92-d2dc-4437-be6b-6b5b66141fc5J&#248;rgen Holmefjord<p>Hi,</p> <ol> <li>NRF_GPIO_PIN_MAP() is a utility-macro that can be used to define the correct pin numbers. You are not forced to use this, but it will likely make the code more readable. When a GPIO is assigned to a <a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/uarte.html#register.PSEL.TXD">peripheral pin</a>, pins on port 1 are given by setting bit 5 of the register. This is equal to adding 32 to the pin number, i.e. P1.13 would be 32+13=45. The output from the&nbsp;<span>NRF_GPIO_PIN_MAP() macro would be the same.</span></li> <li><span>It can be used for pins on both port 0 and port 1. The port argument (0 or 1) is simply left-shifted 5 places.</span></li> <li><span>As mentioned before, it is not strictly necessary, but it increases readability of the code. It may also help for future maintenance/compatibility to be consistent with use of macros like this.</span></li> </ol> <p><span>Best regards,<br />Jørgen</span></p><div style="clear:both;"></div>