Configurable GPIO pins

[fruit-bat]

Firstly, thanks for publishing this. I am using it on my mini-project (https://github.com/fruit-bat/pico-sorcerer-2) and it works really well.

I would love to be able to configure the GPIO pins without having to modify the source code... my sub-module on github won't have the changes needed for other people to download and compile.

Thanks in advance,

fruit-bat

[carlk3]

I removed hw_config.c from the FatFs_SPI library, since I can see how that would interfere with using the library as a submodule. Now, you can define the functions declared in FatFs_SPI/sd_driver/hw_config.h wherever and however you'd like.

I added an example showing how you might set up the configuration at run time.

I have opened a pull request: #12 (comment). Please take a look.

[fruit-bat]

Many thanks for the changes, much appreciated.
I will try them out as soon as I get a chance and get back to you....