#define byte unsigned char
#define SETBIT(ADDRESS,BIT) (ADDRESS |= (1<<(BIT)))
#define CLRBIT(ADDRESS,BIT) (ADDRESS &= ~(1<<(BIT)))
#define TSTBIT(ADDRESS,BIT) (ADDRESS & (1<<(BIT)))
#define SET_PIN SETBIT
#define CLR_PIN CLRBIT
#define PORT_MOSI PORTB
#define PORT_MISO PINB
#define PORT_SCK PORTB
#define PORT_RESET PORTB
#define PIN_MOSI 2
#define PIN_MISO 3
#define PIN_SCK 1
#define PIN_RESET 7
void q_delay()
{
word it;
for(it=0;it<10;it++){_NOP();}
}
byte Send_Receive_Byte_SPI(byte data)
{
byte out=data;
byte in=0;
byte it;
for(it=0;it<8;it++){
// SET DATA MOSI...................
if(TSTBIT(out,7)){
SET_PIN(PORT_MOSI,PIN_MOSI);
} else {
CLR_PIN(PORT_MOSI,PIN_MOSI);
}
q_delay();
// SET STROB SCK...................
SET_PIN(PORT_SCK,PIN_SCK);
q_delay();
// GET DATA MISO...................
if(TSTBIT(PORT_MISO,PIN_MISO)){
SETBIT(in,0);
}
q_delay();
//.................................
CLR_PIN(PORT_SCK,PIN_SCK);
// .................................
out<<=1;
if(it!=7)in<<=1;
}
return in;
}
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