4.2 软件模拟SPI驱动参考

 

 

#define Rom_csH     P1_1 = 1

#define Rom_csL     P1_1 = 0

#define MOSIH       P1_2 = 1

#define MOSIL       P1_2 = 0

#define Rom_sckH    P1_3 = 1

#define Rom_sckL    P1_3 = 0

#define MISO        P1_4

 

void zk_init(void)

{

  Rom_csH;

  MOSIH;

  Rom_sckH;

}

 

void Send_Byte(unsigned char out)

{  

    unsigned char i=0;

 

    for(i=0;i<8;i++)

    {

      Rom_sckL;

      if(((out<<i)&0x80)==0)

          MOSIL;  

      else

          MOSIH;

      Rom_sckH;

  }

}

 

unsigned char Get_Byte(void)        

{

    unsigned char i;

    unsigned char read_dat;

 

    Rom_sckH;

    for(i=0;i<8;i++)

    {

        Rom_sckL;

        read_dat=read_dat<<1;

        if(MISO)                

            read_dat|=0x01;

        else

            read_dat&=0xfe;

        Rom_sckH;

    }

    return(read_dat);

}

 

void SPI_Address(unsigned char AddH,unsigned char AddM,unsigned char AddL)

{

    Send_Byte(AddH);

    Send_Byte(AddM);

    Send_Byte(AddL);

}

 

unsigned long r_dat_bat(unsigned long address,unsigned long DataLen,unsigned char *pBuff)

{

    unsigned long i;

    unsigned char addrHigh;

    unsigned char addrMid;

    unsigned char addrLow;

    addrHigh=address>>16;

    addrMid=address>>8;

    addrLow=(unsigned char)address;

 

    Rom_csL;          

    Send_Byte(0x03);    

    SPI_Address(addrHigh,addrMid,addrLow);  

    for(i=0;i<DataLen;i++)

        *(pBuff+i)=Get_Byte();

    Rom_csH;

    return i;

}

 

unsigned char gt_read_data(unsigned char* sendbuf , unsigned char sendlen , unsigned char* receivebuf, unsigned int receivelen)

{

    unsigned int i;

    Rom_csL;

    for(i = 0; i < sendlen;i++)

    {

        Send_Byte(sendbuf[i]);

    }

    for(i = 0; i < receivelen;i++)

    {

        receivebuf[i] = Get_Byte();

    }

    Rom_csH;

    return 1;

}