ch375pcinterface.c

USB 1.1 U Device for CH375 & USB 2.0 for CH375A 读写usb超精简的程序

//=================================================================================================
//*************************************************************************************************
// Module Name  : CH375PCInterface.C
// Device object: 
// Create date  : 2005-11-7 
// Modify date  : 2005-11-7 
// Description  : USB 1.1 PC Interface for CH375 
//                
// Author       : Li yuanzheng 
// Version      : V1.0  
//*************************************************************************************************
//=================================================================================================
// 
//-------------------------------------------------------------------------------------------------
// Includes 
//-------------------------------------------------------------------------------------------------

/*
****************************************
**  USB 1.1 Host Examples for CH375   **
**  KC7.0@MCS-51                      **
****************************************
*/
/* CH375作为USB主机接口的程序示例 */



/* MCS-51单片机C语言的示例程序, U盘数据读写 */



#include "common.h"



unsigned char volatile xdata CH375_CMD_PORT _at_ 0xBDF1; /* CH375命令端口的I/O地址 */
unsigned char volatile xdata CH375_DAT_PORT _at_ 0xBCF0; /* CH375数据端口的I/O地址 */
extern unsigned char xdata DBUF[BUFFER_LENGTH];



//sbit LED_OUT   =  0x90^4; /* P1.4 低电平驱动LED显示,用于监控演示程序的进度 */
sbit CH375_INT_WIRE =  0xB0^2; /* P3.2, INT0, 连接CH375的INT#引脚,用于查询中断状态 */




#define mDelay1uS( )   /* 对于MCS51单片机,通常不需要1uS延时 */



/* 延时2微秒,请根据单片机速度 */
//void mDelay1uS( )
//{
// unsigned char i;
// for ( i = 1; i != 0; i -- );
//}



/* 延时2微秒,请根据单片机速度 */
void mDelay2uS( )
{
unsigned char i;
for ( i = 2; i != 0; i -- );
}



/* 向CH375命令端口写命令数据 */
void CH375_CMD_PORT_d_out( INT8 d_out )
{
mDelay1uS( );
CH375_CMD_PORT=d_out;
mDelay2uS( );  /* 至少延时2uS */
}



/* 向CH375数据端口写数据 */
void CH375_DAT_PORT_d_out( INT8 d_out )
{
CH375_DAT_PORT=d_out;
mDelay1uS( );
}



/* 从CH375命令端口读数据 */
INT8 CH375_DAT_PORT_in( )
{
mDelay1uS( );
return( CH375_DAT_PORT );
}



/* 延时毫秒,不精确 */
void DelayMs(unsigned char nFactor)
{
unsigned char i;
unsigned int j;
for(i=0; i<nFactor; i++) for(j=0;j<1000;j++) j=j;
}



/* 等待CH375中断并获取状态 */
unsigned char mWaitInterrupt( )
{
unsigned char c;
while ( CH375_INT_WIRE );  /* 如果CH375的中断引脚输出高电平则等待 */
CH375_CMD_PORT_d_out( CMD_GET_STATUS);  /* 获取当前中断状态 */
c = CH375_DAT_PORT_in();  /* 返回中断状态 */
/* if ( c == USB_INT_DISCONNECT )  /* 检测到USB设备断开事件 */
/* else if ( c == USB_INT_CONNECT )  /* 检测到USB设备连接事件 */
return( c );
}



/* 设置CH375为USB主机方式 */
unsigned char mCH375Init( )
{
unsigned char i;
#ifdef TEST_CH375_PORT
unsigned char c;
CH375_CMD_PORT_d_out(CMD_CHECK_EXIST);  /* 测试工作状态 */
CH375_DAT_PORT_d_out( 0x55);  /* 测试数据 */
c = CH375_DAT_PORT_in();  /* 返回数据应该是测试数据取反 */
if ( c != 0xaa ) {  /* CH375出错 */
  for ( i = 100; i != 0; i -- ) {  /* 强制数据同步 */
   CH375_CMD_PORT_d_out( CMD_RESET_ALL );  /* CH375执行硬件复位 */
   c = CH375_DAT_PORT_in();  /* 延时 */
  }
  DelayMs( 50 );  /* 延时至少30mS */
}
#endif
CH375_CMD_PORT_d_out( CMD_SET_USB_MODE);  /* 设置USB工作模式 */
CH375_DAT_PORT_d_out( 6);  /* 模式代码,自动检测USB设备连接 */
for ( i = 0xff; i != 0; i -- ) {  /* 等待操作成功,通常需要等待10uS-20uS */
  if ( CH375_DAT_PORT_in() == CMD_RET_SUCCESS ) break;  /* 操作成功 */
}
if ( i != 0 ) return( 0 );  /* 操作成功 */
else return( 0xff );  /* CH375出错,例如芯片型号错或者处于串口方式或者不支持 */
}


--------------------------------------------------------------------------------
 
--  作者：lxlong
--  发布时间：2004-12-6 12:55:54

--  

/* 初始化磁盘 */
unsigned char mInitDisk( )
{
unsigned char mIntStatus;
CH375_CMD_PORT_d_out( CMD_DISK_INIT);  /* 初始化USB存储器 */
mIntStatus = mWaitInterrupt( );  /* 等待中断并获取状态 */
//if ( mIntStatus == USB_INT_SUCCESS ) return( 0 );  /* U盘已经成功初始化 */
  return  mIntStatus ;  /* 出现错误 */
}

unsigned char ReadCapacity(void)
{
unsigned char *mBufferPoint;
unsigned char  mIntStatus,mLength;
CH375_CMD_PORT_d_out( CMD_DISK_SIZE);  /* 读取容量 */
mBufferPoint=DBUF;
mIntStatus = mWaitInterrupt( );
if ( mIntStatus == USB_INT_DISK_READ )
{  /* USB存储器读数据块,请求数据读出 */
   CH375_CMD_PORT_d_out( CMD_RD_USB_DATA);  /* 从CH375缓冲区读取数据块 */
   mLength = CH375_DAT_PORT_in();  /* 后续数据的长度 */
   while ( mLength ) {  /* 根据长度读取数据 */
    *mBufferPoint = CH375_DAT_PORT_in();  /* 读出数据并保存 */
    mBufferPoint ++;
    mLength --;
   }
  return 1;
    }
}

unsigned long SwapINT32(unsigned long dData)
{
    dData = (dData&0xff)<<24|(dData&0xff00)<<8|(dData&0xff000000)>>24|(dData&0xff0000)>>8;
return dData;
}

unsigned int SwapINT16(unsigned int dData)
{
    dData = (dData&0xff00)>>8|(dData&0x00ff)<<8;
return dData;
}

/* 从U盘中读取多个扇区的数据块到缓冲区中 */
unsigned char RBC_Read(unsigned long iLbaStart, unsigned char iSectorCount,unsigned char *mBufferPoint)
/* iLbaStart 是读取的线起始性扇区号, iSectorCount 是读取的扇区数 */
{
unsigned char mIntStatus;
unsigned int  mBlockCount;
unsigned char mLength;
CH375_CMD_PORT_d_out(CMD_DISK_READ);  /* 从USB存储器读数据块 */
CH375_DAT_PORT_d_out((unsigned char)iLbaStart);  /* LBA的最低8位 */
CH375_DAT_PORT_d_out ((unsigned char)( iLbaStart >> 8 ));
CH375_DAT_PORT_d_out((unsigned char)( iLbaStart >> 16 ));
CH375_DAT_PORT_d_out((unsigned char)( iLbaStart >> 24 ));  /* LBA的最高8位 */
CH375_DAT_PORT_d_out( iSectorCount);  /* 扇区数 */
// mBufferPoint = &DATA_BUFFER;  /* 指向缓冲区起始地址 */
for ( mBlockCount = iSectorCount * CH375_BLK_PER_SEC; mBlockCount != 0; mBlockCount -- ) {  /* 数据块计数 */
  mIntStatus = mWaitInterrupt( );  /* 等待中断并获取状态 */
  if ( mIntStatus == USB_INT_DISK_READ ) {  /* USB存储器读数据块,请求数据读出 */
   CH375_CMD_PORT_d_out(CMD_RD_USB_DATA);  /* 从CH375缓冲区读取数据块 */
   mLength = CH375_DAT_PORT_in();  /* 后续数据的长度 */
/* 通常数据长度是64,有些U盘要求单片机必须在2mS之内取走64字节数据,否则U盘可能数据丢失 */
/* 建议优化下面的循环程序,确保单片机在1mS之内完成64字节的数据传输 */
   if ( mLength ) {  /* 根据长度读取数据 */
    do {  // 对于C51,这个DO+WHILE结构效率高,速度快
     *mBufferPoint = CH375_DAT_PORT_in();  /* 读出数据并保存 */
     mBufferPoint ++;
    } while ( -- mLength );
   }
   CH375_CMD_PORT_d_out( CMD_DISK_RD_GO);  /* 继续执行USB存储器的读操作 */
  }
  else break;  /* 返回错误状态 */
}
if ( mBlockCount == 0 ) mIntStatus = mWaitInterrupt( );  /* 等待中断并获取状态 */
if ( mIntStatus == USB_INT_SUCCESS ) return 1;  /* 操作成功 */
else return 0;  /* 操作失败 */
}


--------------------------------------------------------------------------------
 
--  作者：lxlong
--  发布时间：2004-12-6 12:59:49

--  

TPBLK_STRUC idata TPBulk_Block;
#define     TPBulk_CBW  TPBulk_Block.TPBulk_CommandBlock
#define     CBW_wXferLen TPBulk_CBW.dCBW_DataXferLen
#define     RBC_CDB   TPBulk_CBW.cdbRBC
#define     RBC_LUN   TPBulk_CBW.bCBW_LUN
#define     TPBulk_CSW  TPBulk_Block.TPBulk_CommandStatus

/*unsigned char TPBulk_GetMaxLUN(void)
{
usbstack.setup.bmRequest=0xa1;
usbstack.setup.bRequest=0xfe;
usbstack.setup.wValue=0;
usbstack.setup.wIndex=0;
usbstack.setup.wLength=1;
usbstack.buffer=DBUF;
return ep0Xfer();

}*/

/*
unsigned char SPC_READLONG(void)
{
#define cdbReadLong RBC_CDB.SpcCdb_ReadLong 
//nsigned char retStatus=FALSE;
TPBulk_CBW.dCBW_Signature=CBW_SIGNATURE;
TPBulk_CBW.dCBW_Tag=0x60a624de;
TPBulk_CBW.dCBW_DataXferLen=0xfc000000;
TPBulk_CBW.bCBW_Flag=0x80;
TPBulk_CBW.bCBW_LUN=0;
TPBulk_CBW.bCBW_CDBLen=sizeof(READ_LONG_CMD);

/////////////////////////////////////
cdbReadLong.OperationCode=SPC_CMD_READLONG;
cdbReadLong.LogicalUnitNum=0;
cdbReadLong.AllocationLen=0xfc;
//////////////////////////////////////
if(!epBulkSend((unsigned char *)&TPBulk_CBW,sizeof(TPBulk_CBW)))
  return FALSE;

if(!epBulkRcv(DBUF,0xfc))
  return FALSE;

if(!epBulkRcv((unsigned char *)&TPBulk_CSW,13))
  return FALSE;
  ////////////////////////////
  return TRUE;
#undef cdbReadLong
}
*/

/*
unsigned char SPC_RequestSense(void)
{
#define cdbRequestSenseSPC RBC_CDB.SpcCdb_RequestSense 
//unsigned char retStatus=FALSE;
TPBulk_CBW.dCBW_Signature=CBW_SIGNATURE;
TPBulk_CBW.dCBW_Tag=0x60a624de;
TPBulk_CBW.dCBW_DataXferLen=0x0e000000;
TPBulk_CBW.bCBW_Flag=0x80;
TPBulk_CBW.bCBW_LUN=0;
TPBulk_CBW.bCBW_CDBLen=sizeof(REQUEST_SENSE_SPC);
  
/////////////////////////////////////
cdbRequestSenseSPC.OperationCode=SPC_CMD_REQUESTSENSE;
cdbRequestSenseSPC.AllocationLen=0x0e;
//////////////////////////////////////
if(!epBulkSend((unsigned char *)&TPBulk_CBW,sizeof(TPBulk_CBW)))
  return FALSE;

if(!epBulkRcv(DBUF,18))
  return FALSE;

if(!epBulkRcv((unsigned char *)&TPBulk_CSW,13))
  return FALSE;
/////////////////////////////
return TRUE;

#undef cdbRequestSenseSPC
}
*/

unsigned char SPC_TestUnit(void)
{
#define cdbTestUnit RBC_CDB.SpcCdb_TestUnit 
//unsigned char retStatus=FALSE;
TPBulk_CBW.dCBW_Signature=CBW_SIGNATURE;
TPBulk_CBW.dCBW_Tag=0x60a624de;
TPBulk_CBW.dCBW_DataXferLen=0x00000000;
TPBulk_CBW.bCBW_Flag=0x00;
TPBulk_CBW.bCBW_LUN=0;
TPBulk_CBW.bCBW_CDBLen=sizeof(TEST_UNIT_SPC);
/////////////////////////////////////
cdbTestUnit.OperationCode=SPC_CMD_TESTUNITREADY;
//////////////////////////////////////
if(!epBulkSend((unsigned char *)&TPBulk_CBW,sizeof(TPBulk_CBW)))
  return FALSE;

if(!epBulkRcv((unsigned char *)&TPBulk_CSW,13))
  return FALSE;
#undef cdbTestUnit
////////////////////////////
return TRUE;
}

unsigned char SPC_LockMedia(void)
{
#define cdbLockSPC RBC_CDB.SpcCdb_Remove 
//unsigned char retStatus=FALSE;
TPBulk_CBW.dCBW_Signature=CBW_SIGNATURE;
TPBulk_CBW.dCBW_Tag=0x60a624de;
TPBulk_CBW.dCBW_DataXferLen=0x00000000;
TPBulk_CBW.bCBW_Flag=0x00;
TPBulk_CBW.bCBW_LUN=0;
TPBulk_CBW.bCBW_CDBLen=sizeof(MEDIA_REMOVAL_SPC);
///////////////////////////////////////////
cdbLockSPC.OperationCode=SPC_CMD_PRVENTALLOWMEDIUMREMOVAL;
cdbLockSPC.Prevent=1;
///////////////////////////////////////////
if(!epBulkSend((unsigned char *)&TPBulk_CBW,sizeof(TPBulk_CBW)))
  return FALSE;
  
if(!epBulkRcv((unsigned char *)&TPBulk_CSW,13))
  return FALSE;
#undef cdbLockSPC
/////////////////////////////
return TRUE;
}