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typedef unsigned char byte;
#define SETBIT(ADDRESS,BIT) (ADDRESS |= (1<<(BIT)))
#define CLRBIT(ADDRESS,BIT) (ADDRESS &= ~(1<<(BIT)))
#define TSTBIT(ADDRESS,BIT) (ADDRESS & (1<<(BIT)))
#define PORT_SCK (...)
#define PORT_MOSI (...)
#define PORT_MISO (...)
#define PIN_SCK ...
#define PIN_MOSI ...
#define PIN_MISO ...
void Send_And_Receive_Byte_By_SPI(byte *data)
{
byte out=*data;
byte in=0;
byte inTMP;
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);
}
/* SET STROB SCK.................... */
SET_PIN(PORT_SCK,PIN_SCK);
/* GET DATA MISO.................... */
inTMP=GET_PORT_DATA(PORT_MISO);
if(TSTBIT(inTMP,PIN_MISO)){
SETBIT(in,0);
}
/* ................................. */
CLR_PIN(PORT_SCK,PIN_SCK);
/* ................................. */
out<<=1;
if(it!=7)in<<=1;
}
*data=in; // return Receiving data
}
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