我有一个单片机读AT45DB041B程序,经常里面的数据丢失,是怎么一回事呀.可以帮我看看吗?
#include<AT45DB.h>
void SPI_MasterSend(uchar SData)
{
SPDAT = SData;
while(!(SPSTAT & 0x80))
{
;
}
SPSTAT = 0xc0;
}
uchar AT45DB_SPI_Read(void)
{
uchar R_Data;
SPI_MasterSend(0x00);
R_Data = SPDAT;
return R_Data;
}
uchar AT45DB_Read_State(void)
{
uchar m_nBusy;
AT45DB_CS = 0;
SPI_MasterSend(0xd7);
m_nBusy =AT45DB_SPI_Read();
AT45DB_CS = 1;
return m_nBusy;
}
void AT45DB_ContinuousArrayRead(uint Page_Addr,uint Page_InAddr,uchar *R_Data,uchar Length)
{
uchar i;
while(!(AT45DB_Read_State() & 0x80))
{
;
}
AT45DB_CS = 0;
SPI_MasterSend(0xe8);
SPI_MasterSend((uchar)(Page_Addr >> 7));
SPI_MasterSend((uchar)((Page_Addr << 1) | (Page_InAddr >> 8)));
SPI_MasterSend((uchar)(Page_InAddr));
SPI_MasterSend(0x00);
SPI_MasterSend(0x00);
SPI_MasterSend(0x00);
SPI_MasterSend(0x00);
for(i=0;i<Length;i++)
{
R_Data = AT45DB_SPI_Read();
}
AT45DB_CS = 1;
return;
}
void AT45DB_Write_To_Page_AutoErase(uchar Buffer,uint Buffer_Addr,uint Page_Addr,uchar *W_Data,uchar Length)
{
uchar i;
while(!(AT45DB_Read_State() & 0x80))
{
;
}
AT45DB_CS = 0;
switch (Buffer)
{
case 1:
{
SPI_MasterSend(0x82);
break;
}
case 2:
{
SPI_MasterSend(0x85);
break;
}
default :
{
AT45DB_CS = 1;
return;
}
}
SPI_MasterSend((uchar)(Page_Addr >> 7));
SPI_MasterSend((uchar)((Page_Addr << 1) | (Buffer_Addr >> 8)));
SPI_MasterSend((uchar)(Buffer_Addr));
for(i=0;i<Length;i++)
{
SPI_MasterSend(W_Data);
}
AT45DB_CS = 1;
return;
}
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