Well, this is the DISCOVERY board, which is similar to the EVALUATION boards to demonstrate the functionality of the specific controller and possibly be used to create your own system. Some of the DISCOVERY kits have a few free pins which can be used for some tests. However, you need to find them using the schematics and documentation. In most cases it is too difficult to reassign used pins.
Perhaps you should consider the NUCLEO boards if you are starting your own development and want to have (almost) full freedom in using the available pins and peripherals.
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Good luck!
/Peter
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