// SCK, MOSI and SS as outputs DDRB |= (1<<2)|(1<<3)|(1<<5); SPCR |= (1<<MSTR); // Set as Master SPCR |= (1<<SPR0)|(1<<SPR1); // divided clock by 128 SPCR |= (1<<SPE); // Enable SPI After this configuration on ATMega328, I'm able to send data. However, I don't need SS pin, in fact I'm using SS …

SPI without SS is not possible?

CrossRoads December 9, 2012, 5:52pm 6

Guess you're more concerned with IO count than speed?

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