51單片機控制硬盤資料及電路

#include

/**************************************************
*????????????????? HardDisk Control Demo
*???? Power BY DDDLZHU
*??? 編譯環境 : KEIL C51 V7.07??? 支持器件 : AT89C51??????
*??????????????????? COPYRIGHT (C) 2004???????????????????????

?

***************************************************/

#define byte unsigned char
#define uint unsigned int
/*************************************************
//線路連接定義。如電路有變直接修改就可以了
*************************************************/

#define DataH P1??????????????
#define DataL P0
#define RegAddr P2
#define Read P3_4
#define Write P3_3
#define Rst P3_2

/*************************************************
//線路連接定義。如電路有變直接修改就可以了
*************************************************/

//寄存器地址定義
#define _Status_Control 0x16
#define _Data 0x8
#define _Err_Features 0x9
#define _SecCount 0xa
#define _SecNum 0xb
#define _CylinderL 0xc
#define _CylinderH 0xd
#define _DeviceAndHead 0xe
#define _Status_Command 0xf

//**************************************************************************************/
/*這里為初始化硬盤的重要參數,每個硬盤的參數都不盡相同。若不正確則讀不了盤中的數據。計算方法如下：
先看清楚你的 硬盤表面標簽中的數據，里面有三個重要參數：
1。柱面數（Cylinder）
2。磁頭數（Head）
3。磁道數（Sector）
其中 _MaxHead=0xA+Head
???? _MaxSector=Sector
例如我的130M硬盤（很老吧，哈哈），磁頭數為15，十六進制為0xf,所以_MaxHead=0xAF,磁道數為17,所以_MaxSector=0x11
*/
#define _MaxHead 0xAF
#define _MaxSector 0x11

//************************************************************************************
byte bdata Status=0x00;
sbit ERR=Status^0;
sbit IDX=Status^1;
sbit CORR=Status^2;
sbit DRQ=Status^3;
sbit DSC=Status^4;
sbit DF=Status^5;
sbit DRDY=Status^6;
sbit BSY=Status^7;

//************************************************************
* D7?? D6?? D5?? D4?? D3?? D2??? D1?? D0??????????????????? *
BSY DRDY DWF DSC DRQ CORR IDX?? ERR?????????????????? *
BSY：驅動器忙；???????????????????????????????????????????? *
DRDY：驅動器準備好；??????????????????????????????????????? *
DWF：驅動器寫失敗；???????????????????????????????????????? *
DSC:尋道結束；????????????????????????????????????????????? *
DRQ：請求服務，驅動器希望通過數據寄存器與CPU交換一字節數據；*
CORR：當可以糾正的讀錯誤發生時，該位置1，數據傳輸將繼續進行 *
IDX：收到綜引信號；???????????????????????????????????????? *
ERR：命令執行出錯。???????????????????????????????????????? *
*************************************************************/

byte Data_bufferH=0x0;
byte Data_bufferL=0x0;

//***************串口子程序
void send_string(unsigned char *word);
void send_char(unsigned char word);
unsigned char get_char(void);

/*******************************************************
:延遲函數??????????????????????????????????
********************************************************/???
void delay(byte ms)
{ byte i,j;
for(i=0;i ???? for(j=0;j<255;j++);
}

/*******************************************************
*讀寄存器
********************************************************/
byte ReadReg(byte Addr)
{
RegAddr=Addr;
DataL=0xff;
Read=0;
Status=DataL;
Read=1;
return Status;
}

/*******************************************************
*等待BSY信號
********************************************************/
byte WaitBSY(void)
{
byte timeOut=0;
do{
ReadReg(_Status_Command);
timeOut++;
// if(timeOut>=254) return(0xff);
}while(BSY);
return(1);
}

/*****************************************************
*寫寄存器值
********************************************************/
void WriteReg(byte Addr,byte Data)
{
RegAddr=Addr;
Write=0;
DataL=Data;
Write=1;
}

/*******************************************************
讀數據儲存器中數據
********************************************************/
void ReadData(void)
{
DataH=0xff;
DataL=0xff;
RegAddr=_Data;
Read=0;
Data_bufferL=DataL;
Data_bufferH=DataH;
Read=1;
}

/*******************************************************
寫數據寄存器中數據
********************************************************/
void WriteData(void)
{
RegAddr=_Data;
Write=0;
DataL=Data_bufferL;
DataH=Data_bufferH;
Write=1;
}

/**********************************************************
初始化硬盤????????????????????????????????????????? *
***********************************************************/
void Init(void)
{ do{
WriteReg(_DeviceAndHead,0xa0);
???? ReadReg(_Status_Command);??????
}while(!DRDY|BSY);
??? WriteReg(_DeviceAndHead,_MaxHead);
??? WriteReg(_SecCount,_MaxSector);
??? WriteReg(_Status_Command,0x91);
WaitBSY();
??? WriteReg(_Status_Command,0x10);
WaitBSY();
}

/**********************************************************
讀硬盤參數
***********************************************************/
void DriverID(void)
{
unsigned int i=512;
//send_string("Starting read driver ID\n");
WaitBSY();
//send_string("Now can read driver ID \n");
WriteReg(_Status_Command,0xec);
//send_string("Waiting.. ");
do{ReadReg(_Status_Command);}while(BSY|!DRQ);
//send_string("Now Sending \n");
while(i){
ReadData();
send_char(Data_bufferH);
send_char(Data_bufferL);
i-=2;
}
}

/*********************************************************
硬盤尋址
**********************************************************/
WriteCHS(byte head,uint cylinder,byte sector,byte read_count)
{
WaitBSY();
WriteReg(_DeviceAndHead,0xa0|head);
WriteReg(_CylinderH,(char)(cylinder>>8));
WriteReg(_CylinderL,(char)(cylinder&0x00ff));
WriteReg(_SecNum,sector);
WriteReg(_SecCount,read_count);
}

/**********************************************************
*用途:將硬盤的返回數據讀入BUFFER數組
***********************************************************/
void SendData()
{ uint i;
i=512*15;
do{ReadReg(_Status_Command);}while(BSY|!DRQ);
if(ERR){
send_string("\x0d\x0a Error\x0d\x0a");
??? }
while(i){ReadData();send_char(Data_bufferL);send_char(Data_bufferH);i-=2;}
}

// 激活硬盤(轉動)
void SpinUP()
{
WaitBSY();
WriteReg(_Status_Command,0xE1);
}
// 讓硬盤休眠(停轉)/
void SpinDown()
{
WaitBSY();
WriteReg(_Status_Command,0xE0);
}

void main(void)
{
//Initialize
SCON=0x50; //串口初始化
TMOD=0x20;?? //波特率為57600bps
TCON=0x40;
PCON=0x80;
TH1=0xFf;
TL1=0xFf;
TR1=1;
send_string("IDE Control Demo.???? Power By DDDLZHU\x0d\x0a");//send welcome word
Rst=0; //IDE 復位
delay(50);
Rst=1;
delay(255);
send_string("Reset Driver OK...\x0d\x0a");
Init();?? //初始化硬盤
send_string("Initialize Driver OK,Now Read ID\x0d\x0a");
send_string("HardDisk ID is ....\x0d\x0a");
DriverID(); //讀硬盤id
send_string("\n\nNow Read The First Sector On this HardDisk\x0d\x0a\x0d\x0a");
delay(244);
delay(244);
delay(244);
delay(244);
WriteCHS(0,0,1,16); //寫地址
WaitBSY();
WriteReg(_Status_Command,0x20);?? //發送讀命令
SendData();
send_string("\x0d\x0a\x0d\x0a Read OK,Now Shut Down The HardDisk..\x0d\x0a");
SpinDown();??? //硬盤停轉????
while(1);
}

//**************************************串口子程序
void send_char(unsigned char word)
{
TI=0;
SBUF=word;
while(TI==0);
TI=0;
}

void send_string(unsigned char *word)
{
TI=0;
while(*word!=0)
{
SBUF=*word;
while(TI==0);
TI=0;
word++;
}
}

unsigned char get_char(void)
{
RI=0;
REN=1;
while(RI==0);
return(SBUF);
RI=0;
REN=0;
}