I have to modify some code someone else wrote but I'm a little confused about how things work since it says there are 15 different blocks corresponding to an individual GPIO port and then looking down, the datasheet has 43 different GPIO registers with offsets that show the 15 ports.
Here is the code I'm trying to modify. One of the things I especially don't understand is the shift left of the first bit as well so can someone please help me understand it better so I'm able to modify it.
Hi,
You are showing a snippet of code with no context of what/how it is used for. I will suggest you contact the person you got the code from and ask what his comment is about. Only he/she knows what is the intention of doing the mask and then the shift.
My best guess is the code is trying to write to individual pins but I don't know for sure. See if the below Data Register Operation makes sense to you in relation with the code you got. Again, you should check the code author or at least you need to provide the full context like what functions are being used to act these elements.
