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#ifndef AVR_SPI_SLAVE_ABSTRACTION_H_
#define AVR_SPI_SLAVE_ABSTRACTION_H_
#include <stdint.h>
/* Queue a buffer for transmission to the master. */
int8_t spi_slave_xmit(const void *buf, uint16_t nr_bytes);
/* Queue a buffer for receiving data from the master. */
int8_t spi_slave_fetch(void *buf, uint16_t size);
/* Initialize the SPI slave. */
void spi_slave_init(void);
/*** Callback functions. Define these in the highlevel code. ***/
/* The last transfer (TX or RX) is complete.
* Note that size may be larger than the buffer for RX! This notifies
* a data truncation. */
extern void spi_slave_xfer_complete(uint16_t size);
#endif /* AVR_SPI_SLAVE_ABSTRACTION_H_ */
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