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-Serial peripheral interface
-===========================
-To use include: `spi.h`  
-This interface is link to MOSI and MISO pins. Also SS pin is used when slave mode
-initialized.
-
-Configuration
--------------
-To use SPI you must enable `CONFIG_SPI` configuration symbol.
-
-References
-----------
-### Function spi\_init
-```C
-static inline void spi_init(enum spiMode mode)
-```
-Initializes SPI interface.  
-Parameters:  
-    mode - Specify mode of SPI interface  
-  
-NOTE: Global interrupts must be enabled for right function of SPI.
-
-### Function 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.
-
-### Function spi\_join    
-```C
-static inline void spi_join(void)
-```
-Blocks processor until device is not busy.
-
-### Function 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.
-
-### Function 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.
-
-### Function 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.
-
-Relevant examples
------------------
-* spiblink