Another full update of current work

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-Serial peripheral interface
----------------------------
-This interface is link to MOSI and MISO pins. Also SS pin is used when slave mode initialized.
-
-## Functions
-### spi_init
-```C
-static inline void spi_init(enum spiMode mode)
-```
-Initializes SPI interface.  
-Parameters:  
-    mode - Specify mode of SPI interface  
-  
-NOTE: Global interrupt must be enabled for right function of SPI.
-
-### spi_busy
-```C
-static inline int8_t spi_busy(void)
-```
-Returns NULL when device is not busy.  
-When device is busy return values in non-zero.
-
-### spi_join    
-```C
-static inline void spi_join(void)
-```
-Blocks processor until device is not busy.
-
-### spi_send
-```C
-static inline uint8_t spi_send(uint8_t data)
-```
-Swap bytes with slave over SPI.  
-This function blocks execution until device isn't busy (transfer completed).  
-WARNING: Invoke this only when interface is initialized in MASTER mode.
-
-### spi_transfer
-```C
-static inline void spi_transfer(uint8_t data)
-```
-Transfer byte to slave over SPI.  
-This function isn't blocking execution until transfer is complete.  
-Always call spi_join before this function when called outside of spi_receive().  
-WARNING: Invoke this only when interface is initialized in MASTER mode.
-
-### spi_expose
-```C
-static inline void spi_expose(uint8_t data)
-```
-Expose data for next master request.
-Please don't use this when device is busy.
-Best place to call this is spi_receive().  
-WARNING: Invoke this only when interface is initialized in SLAVE mode.
-
-## Function pointer spi_receive
-```C
-extern void (*spi_receive)(uint8_t data)
-```
-This function is called every time transfer is finished.
-And until return from this function interrupts are disabled.
-
-## Enum spiMode
-```C
-enum spiMode {
-    SPI_MODE_MASTER,
-    SPI_MODE_SLAVE
-};
-```
-This is used as parameter for spi_init function.