spi.txt

at45db321驱动程序

实验说明：

1./RESET接地，不可以操作。
2./WP接地，可以读写BUFFER1,2,可以读ID,不能操作主存。
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void AT45_Write_Buffer(uchar buffer_choice,uint address,const char * const string, uint buf_len);
void AT45_Read_Buffer(uchar buffer_choice,uint address,uint buf_len,char * string);

void AT45_MemoryToBuffer(uchar buffer_choice,uint page);
void AT45_BufferToMemory(uchar buffer_choice,uint page);

void AT45_MemoryRead(uint page,uint address,uint num,char * string);
void AT45_MemoryPageWrite(uchar buffer_choice,uint page,uint address,uint num,const char * const string);

void AT45_ErasePage(uint page); //page(0~8191)
void AT45_EraseBlock(uint block);//Block(0~1023)

/*interrupt [SPI_STC] void SPI_Isr(void)
{
    //发送完毕进入中断服务函数
    //任务：
    SPI_State=1;//已发送完可以发送下一下
    Rec_data[Rec_count]=SPDR;
    if(Rec_count==50)
    {
    Rec_count=0;
    }
    else
    {
    Rec_count++;
    }
} */



static ClearProtect(void)
{
    //unsigned char comand=0;
    CS_0;
    SPI_WriteByte(0x3D);
    SPI_WriteByte(0x2A);
    SPI_WriteByte(0x7F);
    SPI_WriteByte(0x9A);
    CS_1;
}
static ReadProtect(void)
{
    unsigned char k;
    unsigned char ddd[5];
    //unsigned char comand=0;
    CS_0;
    SPI_WriteByte(0x3D);
    SPI_WriteByte(0x2A);
    SPI_WriteByte(0x7F);
    SPI_WriteByte(0x9A);
    for(k=0;k<5;k++)
    {
    ddd[k]=SPI_ReadByte(0);
    }
    CS_1;
}
static EraseProtect(void)
{
    //unsigned char comand=0;
    CS_0;
    SPI_WriteByte(0x3D);
    SPI_WriteByte(0x2A);
    SPI_WriteByte(0x7F);
    SPI_WriteByte(0xA9);
    CS_1;
}


//擦除一页
/*void AT45_ErasePage(uint page) //page(0~8191)
{
   uchar temp;
   CS_0;
   //send command stream of data
   SPI_WriteByte(0X81);// MEM_PAGE_ERASE
   temp=(uchar)(page>>6);
   SPI_WriteByte(temp); //地址最高字节
   temp = (((uchar)page)<<2);
   SPI_WriteByte(temp);       //地址高字节
   SPI_WriteByte(BYTE_DUMMY);       //地址低字节
   CS_1;
   IsBusy();
}
*/