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#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdint.h>
#include "mcu/mcu_def.h"
#ifndef _IOE_USI_SPI_H_
#define _IOE_USI_SPI_H_
#ifndef MCUSUPPORT_USI
#error "No USI interface is known on your mcu."
#endif
enum usiSpiMode {
// Device is initialized as master
USI_SPI_MODE_MASTER,
// Device is initialized as slave
USI_SPI_MODE_SLAVE,
};
/*
* Initialize SPI on USI device
*
* Parameters:
* mode - Specify mode of SPI interface
*/
void usi_spi_init(enum usiSpiMode mode);
/*
* Returns NULL when device is not busy.
* When device is busy return values in non-zero.
*/
int8_t usi_spi_busy(void);
/*
* Blocks processor until device is not busy.
*/
void usi_spi_join(void);
/*
* Swap bytes with slave over SPI.
* This function blocks execution until device isn't busy.
* WARNING: Invoke this only when interface is initialized in MASTER mode.
*/
uint8_t usi_spi_send(uint8_t data);
/*
* Swaps byte with slave over SPI.
* This function isn't checking if device is busy, but it's not blocking execution.
* WARNING: Invoke this only when interface is initialized in MASTER mode.
*/
uint8_t usi_spi_transfer(uint8_t data);
/*
* Expose data for next master request.
* Please don't use this when device is busy.
* Best place to call this is usi_spi_retrieve().
* WARNING: Invoke this only when interface is initialized in SLAVE mode.
*/
void usi_spi_expose(uint8_t data);
/*
* 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.
* WARNING: Please define this function in your code.
*/
void usi_spi_receive(uint8_t data);
#endif /* _IOE_USI_SPI_H_ */
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