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/**  @page gpio_page GPIO Controller
 
 @section gpio_regs GPIO registers mapping

 GPIO Controller acts like a slave AMBA AXI4 device that is directly mapped
 into physical memory. Default address location for our implementation 
 is defined by 0x80000000. Memory size is 4 KB.

 @par LED register (0x000).

 |Bits|Type| Reset |Field Name| Bits  | Description 
 |:--:|:--:|:-----:|:---------|:-----:|:------------------------------------------------------------|
 | 24 | RW | 24h'0 | rsrv     | 24    | Reserved
 | 8  | RW | 8h'0  | led      | 7:0   | <b>LEDs</b>. Written value directly assigned on SoC output pins and can be used as test signals.

 @par DIP register (0x004).

 |Bits|Type| Reset |Field Name| Bits  | Description 
 |:--:|:--:|:-----:|:---------|:-----:|:------------------------------------------------------------|
 | 28 | RO | 28h'0 | rsrv     | 28    | Reserved
 | 4  | RO | -     | dip      | 3:0   | <b>DIPs</b>. Input configuration pins value (Read-Only). Configuration pin meaning depends of the used FW.

 @par Set of temporary registers (0x008).

 |Offset |Bits|Type| Reset | Name | Definition 
 |:------|:--:|:--:|:-----:|:----:|---------------------------------------------|
 |0x008  | 32 | RW | 32h'0 | reg32_2 | <b>Temporary register 2</b>. FW specific register used for debugging purposes.
 |0x00C  | 32 | RW | 32h'0 | reg32_3 | <b>Temporary register 3</b>.
 |0x010  | 32 | RW | 32h'0 | reg32_4 | <b>Temporary register 4</b>.
 |0x014  | 32 | RW | 32h'0 | reg32_5 | <b>Temporary register 5</b>.
 |0x018  | 32 | RW | 32h'0 | reg32_6 | <b>Temporary register 6</b>.

*/