#define FMCS_0 P1OUT |= 0x01 //FMCS=1//P1.0
#define FMCS_0 P1OUT &= ~0x01 //FMCS=0//P1.0
#define SCK_1 P1OUT |= 0x08 //SCK=1//P1.3
#define SCK_0 P1OUT &=~ 0x08 //SCK=0//P1.3
#define SI_1 P1OUT |= 0x04 //CPU向AT写1//P1.2
#define SI_0 P1OUT &=~ 0x04 //CPU向AT写0//P1.2
#define SO_IN ((P1IN & 0x02) == 0x02) //CPU读.//P1.1
#define HIGHTOLOW {_NOP(); SCK_1; _NOP(); SCK_0; _NOP();}
写一字节子程序：
void Wr1byte(unsigned char Data)
{
unsigned char i;
for (i=0; i<8; i++)
{
if ((Data & 0x80) == 0x80)
SI_1;
else
SI_0;
HIGHTOLOW;
Data = Data<< 1;
}
}
读一字节子程序：
unsigned char Rd1byte(void)
{
unsigned char i，medBit=0;
unsigned char Data=0;
for (i=0; i<8; i++)
{
HIGHTOLOW;
_NOP();
if (SO_IN )
medBit = 1; //if(SO==1)medBit=1;
else
medBit = 0;
Data = (Data << 1) | medBit;
return Data;
}
} |
|
楼主
