430模拟SPI的C语言代码.C

只看该作者 · 2007-2-6 11:19

#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;
        }
}

只看该作者 · 2007-2-6 11:24

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;
}

430模拟SPI的C语言代码.C

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