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#include <stdio.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <inttypes.h>
#ifndef _IOE_SPI_USI_H_
#define _IOE_SPI_USI_H_
/*
* Initialize USI as SPI
*
* NOTE: Global interrupt must be enabled for right function.
* { SREG |= _BV(7) }
*/
inline void ioe_spi_usi_init(void);
#ifdef IOE_SPI_USI_MASTER
/*
* Swaps byte with slave over SPI.
*/
inline int8_t ioe_spi_usi_transfer(int8_t data);
#else
/*
* Expose data for next master request.
* Please don't use this when device is busy.
* Best place to call this is ioe_spi_usi_retrieve().
*/
inline void ioe_spi_usi_expose(int8_t data);
/*
* Returns NULL when device is no busy.
* When device is busy, returned value is number of already send bits.
*/
inline uint8_t ioe_spi_usi_busy(void);
/*
* Blocks processor until device is not busy.
*/
inline void ioe_spi_usi_join(void);
// Following function must be user defined
/*
* This function must be defined by user.
* This function is called every time transfer is finished.
* And until return from this function interrupts are disabled.
*/
inline void ioe_spi_usi_retrieve(int8_t data);
#endif /* IOE_SPI_USI_MASTER */
#endif /* _IOE_SPI_USI_H_ */
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