原创 FM25L04 SPI通讯程序

单片机采用的是MSP430F169，采用一般IO口模拟SPI通讯。

程序的相关IO脚需设置成输入输出的工作方式，这一点anxingedu没有贴出来，因为采用单片机不同而异。

希望能够对大家有帮助，能够节省时间。

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//定义通讯命令
#define SPI_WREN  0x06
#define SPI_WRDI  0x04
#define SPI_RDSR  0x05
#define SPI_WRSR  0x01
#define SPI_READ  0x03
#define SPI_WRITE 0x02

//定义通讯管脚
#define Set_Fcs  P4OUT=P4OUT|0x40
#define Clr_Fcs  P4OUT=P4OUT&0xbf
#define Set_Fck  P5OUT=P5OUT|0x01
#define Clr_Fck  P5OUT=P5OUT&0xfe
#define Set_MOFI P5OUT=P5OUT|0x02
#define Clr_MOFI P5OUT=P5OUT&0xfd

/***************************************************
====================FM25L04程序开始====================
***************************************************/
//FCS-P46  MIFO-P47 MOFI-P50 FCK-P51
void write_byte(uchar tem)
{
  uchar i,j,k; 
  k="0x80";
 for(j=0;j<8;j++)
 {
  i=tem&k;
  if(i==0)
    {
      Clr_MOFI;
    }
    else
    {
      Set_MOFI;
    }
   k="k">>1;
   Set_Fck;
    Clr_Fck;
 } 
}

uchar read_byte(void )
{
  uchar j,k,tem; 
  tem="0";
 k=0x80;
  for(j=0;j<8;j++)
 {
  Set_Fck;
  if((P4IN&0x80)==0x80)
    {
      tem="tem|k";
    }
    k="k">>1;
   Clr_Fck;
 }
 return(tem);
}
//Status Register Read:
//Format: RDSR op-code, Data-out
uchar ReadFlSr(void )
{
  uchar i;
  Clr_Fcs;
  write_byte(SPI_RDSR);
  i="read"_byte();
  Set_Fcs;
  return(i);
}

//Status Register Write:
//Format: WREN op-code, WRSR op-code, Data-in
void WriteFlSr(uchar Data )
{
  Clr_Fcs;
  write_byte(SPI_WRSR);
  write_byte(Data);
  Set_Fcs;
}

//Memory Writes:
//Format: WREN op-code, WRITE op-code, MSB Address, LSB Address, Data-in, (Data-in, Data-in, ...)
void WriteMemory(uchar Addrh,uchar Addrl,uchar Data )
{
  Clr_Fcs;
  write_byte(SPI_WREN);
  Set_Fcs;
 
  Clr_Fcs;
  write_byte(SPI_WRITE|Addrh);
  write_byte(Addrl);//Addr
  write_byte(Data);//Data
  Set_Fcs;
}

//Memory Reads
//Format: READ op-code, MSB Address, LSB Address, Data-out, (Data-out, Data-out, ...)
uchar ReadMemory(uchar Addrh,uchar Addrl )
{
  uchar i;
  Clr_Fcs;
  write_byte(SPI_READ|Addrh);
  write_byte(Addrl);//Addr
  i="read"_byte();
  Set_Fcs;
  return(i);
}
/***************************************************
====================FM25L04程序结束====================
***************************************************/
void main( void )
{
  WDTCTL = WDTPW + WDTHOLD;// Stop watchdog timer
  //init_ram();
  //init_usart();
  _BIS_SR(GIE);
  while(1)
  {
 WriteMemory(0x00,0x00,0XFF);
 uidatab[0]=ReadMemory(0x00,0x00);
  }         
}
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