harddisc.h

基于UCOS-II制作的MP3

/*H**************************************************************************
* NAME:         harddisk.h
*----------------------------------------------------------------------------
* Copyright (c) 2004 Toplow.
*----------------------------------------------------------------------------
* RELEASE:      
* REVISION:     
*----------------------------------------------------------------------------
* PURPOSE: 
* 
*
* NOTES:
* Global Variables:
*   - gl_sbc_wr_protect:  write protect flag for SCSI disk
*****************************************************************************/

/*_____ I N C L U D E S ____________________________________________________*/
#include "config.h"                         /* system configuration */
#include <absacc.h>




#define FILE0 XBYTE[0x0880]            //硬盘数据寄存器          
#define FILE1 XBYTE[0x0881]            //错误/特征寄存器
#define FILE2 XBYTE[0x0882]            //扇区数寄存器
#define FILE3 XBYTE[0x0883]            //扇区号寄存器
#define FILE4 XBYTE[0x0884]            //柱面号寄存器L
#define FILE5 XBYTE[0x0885]            //柱面号寄存器H
#define FILE6 XBYTE[0x0886]            //驱动器/磁头寄存器
#define FILE7 XBYTE[0x0887]            //状态/命令寄存器



///////////////////位设置///////////////////////////
sbit BSY=ACC^7;
sbit DRDY=ACC^6;
sbit DRQ=ACC^3;
sbit ERR=ACC^0;

/************************************************************
* D7   D6   D5   D4   D3   D2    D1   D0                    *
BSY  DRDY  DWF  DSC DRQ  CORR  IDX   ERR                   *
BSY：驱动器忙；                                             *
DRDY：驱动器准备好；                                        *
DWF：驱动器写失败；                                         *
DSC:寻道结束；                                              *
DRQ：请求服务，驱动器希望通过数据寄存器与CPU交换一字节数据；*
CORR：当可以纠正的读错误发生时，该位置1，数据传输将继续进行 *
IDX：收到综引信号；                                         *
ERR：命令执行出错。                                         *
*************************************************************/



sbit ARST=P5^3;
sbit INTQ=P5^1;

//uchar status;             //从硬盘寄存器返回的状态数据寄存器
uchar buffer0,buffer1;    //硬盘16位数据


/*******************************************************
*函数名称:void ReadReg(uchar address)                  *
*函数用途:读硬盘非数据寄存器内容，并将结果返回         *
********************************************************/
/*void ReadReg(uchar address)
{
 status=address;
 ACC=status;

}


/*******************************************************
*函数名称:void WriteReg(uchar address,uchar sdata)     *
*函数用途:写硬盘非数据寄存器内容                       *
********************************************************/
/*void WriteReg(uchar address,uchar sdata)
{XBYTE[0x0881]=address;

}

/*******************************************************
*函数名称:void ReadData()                              *
*函数用途:读硬盘数据寄存器内容                         *
********************************************************/
void ReadData()
{
 buffer0=FILE0;
 buffer1=DAT16H;
}

/*******************************************************
*函数名称:void WriteData(uchar Data0,uchar Data1)      *
*函数用途:写硬盘数据寄存器内容                         *
********************************************************/
/*void WriteData(uchar address,uchar data0,uchar data1)
{
 DAT16H=data1;
 address=data0;

 }*/


/*********************************************************
*函数名称:WriteLBA(Uint32 LBA)                           *
*函数用途:写LBA信息(地址信息)                            *
**********************************************************/
WriteLBA(Uint32 LBA)
{uchar head,cylinderh,cylinderl,sector;
 head=(uchar)(LBA>>24);
 cylinderh=(uchar)((LBA&0x00ff0000)>>16);
 cylinderl=(uchar)((LBA&0x0000ff00)>>8);
 sector=(uchar)(LBA&0x000000ff);
 do{ACC=FILE7;}while(BSY);
  FILE6=(0xe0|(head&0x0f));
  FILE5=cylinderh;    //high 2-bit cylinder
  FILE4=cylinderl;//low 8-bit cylinder
  FILE3=sector; //start sector
  FILE2=0x01;   //sector counter
}

/*********************************************************
*函数名称:WriteCHS(uint cylinder,uchar head,uchar sector)*
*函数用途:写CHS信息(地址信息)                            *
**********************************************************/
WriteCHS(uchar head,uchar cylinderh,uchar cylinderl,uchar sector)
{do{ACC=FILE7;}while(BSY);
  FILE6=(0xe0|(head&0x0f));
  FILE5=cylinderh;    //high 2-bit cylinder
  FILE4=cylinderl;//low 8-bit cylinder
  FILE3=sector; //start sector
  FILE2=0x01;   //sector counter
}
/*********************************************************
*函数名称:WriteCommand(command)                          *
*函数用途:写命令                                         *
**********************************************************/
WriteCommand(command)
{do{ACC=FILE7;}while(BSY);
 FILE7=command;
}


/**********************************************************
*函数名称:void DriveID(void)                              *
*用途:读硬盘ID                                            *
***********************************************************/ 
void DriveID(void) 
{uint i=512;
 do{ACC=FILE7;}while(BSY);
    FILE7=0xec;
 do{ACC=FILE7;}while(BSY|!DRQ);
 while(i){ReadData();putch(buffer0);putch(buffer1);i-=2;}
}


/**********************************************************
*函数名称:GetData()                                       *
*用途:将硬盘的返回数据读入BUFFER数组                      *
***********************************************************/
void GetData()
{uint i=0;
 do{ACC=FILE7;}while(BSY|!DRQ);
 if(ERR){LcdWriteCH(0x90,MEG[0],MEG[1]);
         LcdWriteCH(0x91,MEG[2],MEG[3]);
         }
  /* else {LcdWriteCH(0x90,MEG[4],MEG[5]);
         LcdWriteCH(0x91,MEG[4],MEG[5]);
         LcdWriteCH(0x94,INF[0],INF[1]);
         LcdWriteCH(0x95,INF[2],INF[3]);
         LcdWriteCH(0x96,INF[4],INF[5]);
        }*/
  while(i!=512){ReadData(); 
                BUFFER[i++]=buffer0;
                BUFFER[i++]=buffer1;
                }
}

////////////////////////////////////////////////////////////

void GetTowSector(void)
{uint i=0;
 do{ACC=FILE7;}while(BSY|!DRQ);
 if(ERR){LcdWriteCH(0x90,MEG[0],MEG[1]);
         LcdWriteCH(0x91,MEG[2],MEG[3]);
         }
  /* else {LcdWriteCH(0x90,MEG[4],MEG[5]);
         LcdWriteCH(0x91,MEG[4],MEG[5]);
         LcdWriteCH(0x94,INF[0],INF[1]);
         LcdWriteCH(0x95,INF[2],INF[3]);
         LcdWriteCH(0x96,INF[4],INF[5]);
        }*/
  while(i!=1024){ReadData(); 
                 BUFFER[i++]=buffer0;
                 BUFFER[i++]=buffer1;
                }
}

/**********************************************************
*函数名称:GetLBAData()                                    *
*用途:将硬盘的返回数据读入BUFFER数组                      *
***********************************************************/
void GetLBAData(Uint32 LBA)
  {uchar head,cylinderh,cylinderl,sector;
   head=(uchar)(LBA>>24);
   cylinderh=(uchar)((LBA&0x00ff0000)>>16);
   cylinderl=(uchar)((LBA&0x0000ff00)>>8);
   sector=(uchar)(LBA&0x000000ff);
   do{ACC=FILE7;}while(BSY);
    FILE6=(0xe0|(head&0x0f));
    FILE5=cylinderh;    //high 2-bit cylinder
    FILE4=cylinderl;//low 8-bit cylinder
    FILE3=sector; //start sector
    FILE2=0x02;   //sector counter
    WriteCommand(0x20);
	GetTowSector();
    BufferFlag=1;
   }



/**********************************************************
*函数名称:void IniHard(void)                              *
*用途:初始化硬盘                                          *
***********************************************************/
void IniHard(void)
{ARST=0;
 delay(0xffff);
 ARST=1;
 delay(0xffff);

 AUXR=0x5c;         //设置EXT16=1,使能16-BIT传送模式

 do{FILE6=0xa0; ACC=FILE7;}while(!DRDY|BSY);
    FILE6=0x20;
    FILE2=64;
    FILE7=0x91;
do{ACC=FILE7;}while(BSY);
   FILE7=0x10;
do{ACC=FILE7;}while(BSY); 
}