* Each of the general-purpose I/O ports has two 32-bit configuration registers (GPIOx_CRL, GPIOx_CRH), two 32-bit data registers (GPIOx_IDR, GPIOx_ODR), a 32-bit set/reset register (GPIOx_BSRR), a 16-bit reset register (GPIOx_BRR) and a 32-bit locking register (GPIOx_LCKR).
* Basic structure of a standard I/O port bit
* Input configuration:
* Output Configuration
-Note about Open Drain Mode and Push-Pull Mode:
In open Drain Mode, Pmos is not used, when need a high, turn off NMOS, the line will be pulled high by a pull up resistor,with the open drain mode, current is limited by R
In the push-pull mode, high speed is achieved, but source more current.
* Alternate function & Analog configuration
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