Specifications

100
*/
sbi(VS_SI_DDR, VS_SI_BIT);
/*
* Set SS to output for SPI master mode.
*/
sbi(VS_SS_DDR, VS_SS_BIT);
/*
* Set MISO to input.
*/
cbi(VS_SO_DDR, VS_SO_BIT);
/*
* Set SCK output low.
*/
sbi(VS_SCK_DDR, VS_SCK_BIT);
cbi(VS_SCK_PORT, VS_SCK_BIT);
outp(BV(MSTR) | BV(SPE), SPCR);
inp(SPSR); // clear status
}