spi.c

采用Atmega16的变频式超声波发生器的源代码

#include"main.h"


void spi_init(void)
{
sbi(ddrb,4);
sbi(portb,4);
sbi(ddrb,5);
sbi(ddrb,7);

SPCR=(1<<SPE)|(1<<MSTR)|(0<<SPR1)|(1<<SPR0);
//SPDR=0;
//sbi(SPCR,SPIE);
}

uchar spi(uchar data)
{
SPDR=data;
loop_until_bit_is_set(SPSR,7);
return SPDR;
}



ISR(SIG_SPI)
{

}