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#include <avr/io.h>
#define SPI_CS 2
#define SPI_MOSI 3
#define SPI_MISO 4
#define SPI_SCK 5
int main() {
DDRB |= (1<<SPI_CS);
DDRB |= (1<<SPI_MOSI);
DDRB &=~(1<<SPI_MISO);
DDRB |= (1<<SPI_SCK);
// reset slave
PORTB |= _BV(SPI_CS);
PORTB &= ~_BV(SPI_CS);
SPCR = (1<<SPE)|(1<<MSTR)|(1<<DORD)|(1<<CPHA)|(1<<CPOL);
SPDR = 0x35;
while(!(SPSR & (1<<SPIF)));
SPDR = 0x12;
while(!(SPSR & (1<<SPIF)));
SPDR = 0x01;
while(!(SPSR & (1<<SPIF)));
SPDR = 0x56;
while(!(SPSR & (1<<SPIF)));
SPDR = 0x35;
while(!(SPSR & (1<<SPIF)));
SPDR = 0x12;
while(!(SPSR & (1<<SPIF)));
SPDR = 0x00;
while(!(SPSR & (1<<SPIF)));
SPDR = 0x00;
while(!(SPSR & (1<<SPIF))); SPDR=SPDR;
while(!(SPSR & (1<<SPIF)));
}
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