51单片机硬盘控制电路以及源程序.doc

#include /* harddisk control demo * power by dddlzhu* 编译环境 : keil c51 v7.07 支持器件 : at89c51 * copyright (c) 2004*/#define byte unsigned char#define uint unsigned int/*/线路连接定义。如电路有变直接修改就可以了*/#define datah p1 #define datal p0#define regaddr p2#define read p3_4#define write p3_3#define rst p3_2/*/线路连接定义。如电路有变直接修改就可以了*/寄存器地址定义#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/*/*这里为初始化硬盘的重要参数,每个硬盘的参数都不尽相同。若不正确则读不了盘中的数据。计算方法如下：先看清楚你的 硬盘表面标签中的数据，里面有三个重要参数：1。柱面数（cylinder）2。磁头数（head）3。磁道数（sector）其中 _maxhead=0xa+head _maxsector=sector例如我的130m硬盘（很老吧，哈哈），磁头数为15，十六进制为0xf,所以_maxhead=0xaf,磁道数为17,所以_maxsector=0x11*/#define _maxhead 0xaf#define _maxsector 0x11/*byte bdata status=0x00;sbit err=status0;sbit idx=status1;sbit corr=status2;sbit drq=status3;sbit dsc=status4;sbit df=status5;sbit drdy=status6;sbit bsy=status7;/* 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。 */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);/*:延迟函数 */ void delay(byte ms) byte i,j;for(i=0;ims;i+) for(j=0;j=254) return(0xff);while(bsy);return(1);/*写寄存器值*/void writereg(byte addr,byte data)regaddr=addr;write=0;datal=data;write=1;/*读数据储存器中数据*/void readdata(void)datah=0xff;datal=0xff;regaddr=_data;read=0;data_bufferl=datal;data_bufferh=datah;read=1;/*写数据寄存器中数据*/void writedata(void)regaddr=_data;write=0;datal=data_bufferl;datah=data_bufferh;write=1;/*初始化硬盘 */void init(void) dowritereg(_deviceandhead,0xa0); readreg(_status_command); while(!drdy|bsy); writereg(_deviceandhead,_maxhead); writereg(_seccount,_maxsector); writereg(_status_command,0x91);waitbsy(); writereg(_status_command,0x10);waitbsy();/*读硬盘参数*/ void driverid(void) unsigned int i=512;/send_string(starting read driver idn);waitbsy();/send_string(now can read driver id n);writereg(_status_command,0xec);/send_string(waiting. );doreadreg(_status_command);while(bsy|!drq);/send_string(now sending n);while(i)readdata();send_char(data_bufferh);send_char(data_bufferl);i-=2;/*硬盘寻址*/writechs(byte head,uint cylinder,byte sector,byte read_count)waitbsy();writereg(_deviceandhead,0xa0|head);writereg(_cylinderh,(char)(cylinder8); writereg(_cylinderl,(char)(cylinder&0x00ff);writereg(_secnum,sector); writereg(_seccount,read_count);/*用途:将硬盘的返回数据读入buffer数组*/void senddata() uint i;i=512*15;doreadreg(_status_command);while(bsy|!drq);if(err)send_string(x0dx0a errorx0dx0a); while(i)readdata();send_char(data_bufferl);send_char(data_bufferh);i-=2;/ 激活硬盘(转动)void spinup()waitbsy();writereg(_status_command,0xe1);/ 让硬盘休眠(停转)/void spindown()waitbsy();writereg(_status_command,0xe0);void main(void)/initialize scon=0x50; /串口初始化tmod=0x20; /波特率为57600bpstcon=0x40;pcon=0x80;th1=0xff;tl1=0xff;tr1=1;send_string(ide control demo. power by dddlzhux0dx0a);/send welcome wordrst=0; /ide 复位delay(50);rst=1;delay(255);send_string(reset driver ok.x0dx0a);init(); /初始化硬盘send_string(initialize driver ok,now read idx0dx0a);send_string(harddisk id is .x0dx0a);driverid(); /读硬盘idsend_string(nnnow read the first sector on this harddiskx0dx0ax0dx0a);delay(244);delay(244);delay(244);delay(244);writechs(0,0,1,16); /写地址waitbsy();writereg(_status_command,0x20); /发送读命令senddata();send_string(x0dx0ax0dx0a read ok,now shut down the harddisk.x0dx0a);spindown(); /硬盘停转 while(1);/*串口子程序void send_char(unsigned char word) ti=0;sbu