at45xx.c

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#include <app.h>


BYTE DF_ReadStatus(void)
{
   BYTE Data;

   DF_CS_LO();

   //command
   SPI_Write(DF_STATUS);

   Data = SPI_Read();

   DF_CS_HI();

   return (Data);
}

void DF_WriteBuffer1(WORD Address, BYTE* Data, WORD size)
{
   DF_CS_LO();

   //command
   SPI_Write(BUFFER1_WRITE);
   //don't care 8 bits
   SPI_Write(0);
   //2 high address bits
   SPI_Write(*((BYTE*)&Address +1));
   //8 low address bits
   SPI_Write((BYTE)Address);
   //write data byte
  do { 
   SPI_Write(*Data);
   Data++;
  } while(--size);
  
   DF_CS_HI();
} 

void DF_ReadBuffer1(WORD Address, BYTE* data, WORD size)
{
   DF_CS_LO();

   //command
   SPI_Write(BUFFER1_READ);
   //don't care 8 bits
   SPI_Write(0);
   //2 high address bits
   SPI_Write(*((BYTE*)&Address +1));
   //8 low address bits
   SPI_Write((BYTE)Address);
   //don't care 8 bits
   SPI_Write(0);
   do {
      *data = SPI_Read();
      data++;
   }while(--size);
   DF_CS_HI();
}

#ifdef _ERASEPAGE
void DF_ErasePage(WORD PageNum)
{
   DF_CS_LO();

   PageNum <<= 1;

   //command
   SPI_Write(PAGE_ERASE);
   // high address bits
   SPI_Write(*((BYTE*)&PageNum + 1));
   // low address bits
   SPI_Write((BYTE)PageNum);
   //don't care 8 bits
   SPI_Write(0);

   DF_CS_HI();
}
#endif

void DF_Buffer12MainMemoryE(WORD PageNum)
{
   PageNum <<= 1;

   DF_CS_LO();

   //command
   SPI_Write(BUFFER1_PROGRAM_WITH_ERASE);
   // high address bits
   SPI_Write(*((BYTE*)&PageNum + 1));
   // low address bits
   SPI_Write((BYTE)PageNum);
   //don't care 8 bits
   SPI_Write(0);

   DF_CS_HI();
} 

void DF_Page2Buffer1(WORD Pagenum)
{
   Pagenum <<= 1;
   DF_CS_LO();
   
   //command
   SPI_Write(MAIN_MEMORY_PAGE_TO_BUFFER1_COPY);
   // high address bits
   SPI_Write(*((BYTE*)&Pagenum + 1));
   // low address bits
   SPI_Write((BYTE)Pagenum);
   //don't care 8 bits
   SPI_Write(0);
   
   DF_CS_HI();
} 

void DF_AutoPageRewrite(WORD PageNum)
{
   DF_CS_LO();

   PageNum <<= 1;

   //command
   SPI_Write(AUTO_PAGE_THROUGH_BUFFER1_REWRITE);
   // high address bits
   SPI_Write(*((BYTE*)&PageNum + 1));
   // low address bits
   SPI_Write((BYTE)PageNum);
   //don't care 8 bits
   SPI_Write(0);

   DF_CS_HI();
} 

void DF_Compare(WORD Pagenum)
{
   Pagenum <<= 1;
   DF_CS_LO();
   
   //command
   SPI_Write(MAIN_MEMORY_PAGE_TO_BUFFER1_COMPARE);
   // high address bits
   SPI_Write(*((BYTE*)&Pagenum + 1));
   // low address bits
   SPI_Write((BYTE)Pagenum);
   //don't care 8 bits
   SPI_Write(0);
   
   DF_CS_HI();
} 
//*****************************************************************************[ENDL]***************