ideidentifieddevice.c

在51下的外挂硬盘和FLASH的MP3方案程序以及原理图

#ifndef _IDEIO_DEFINE
 #include "IDEIO.c"
#endif

BYTE IDEIdentifiedDevice(BYTE DeviceNum);

BYTE IDEIdentifiedDevice(BYTE DeviceNum)
{
	register WORD i;
	register BYTE status=0xff;

	IDEDevice[DeviceNum].DriverType=0;

	if (DeviceNum) status=0xb0;else status=0xa0;

   	if (!IDEStatus(IDE_STATUS_BSY,IDE_WAIT,FALSE,255)) return(IDE_ERROR_BSY);
	if (!IDEStatus(IDE_STATUS_DRDY,IDE_WAIT,TRUE,255)) return(IDE_ERROR_DRDY);
	IDE_WRITE_LSB(IDE_ADDR_CMD_HEAD,status);
	IDE_WRITE_LSB(IDE_ADDR_CMD_COMMAND,IDE_CMD_IDENTIFYDEV);				//写命令
	if (!IDEStatus(IDE_STATUS_BSY,IDE_WAIT,FALSE,255)) return(IDE_ERROR_BSY);
	if (!IDEStatus(IDE_STATUS_DRQ,IDE_WAIT,TRUE,255)) return(IDE_ERROR_DRQ);
	
	for(i=0;i<512;)
	{
		IDE_READ_WORD(IDE_ADDR_CMD_DATA,DiskBuffer[i++],DiskBuffer[i++]);
	}
	IDEDevice[DeviceNum].TotalSectors=*(DWORD *)(DiskBuffer+120);
	IDEDevice[DeviceNum].TotalSectors=MEMSwap32(IDEDevice[DeviceNum].TotalSectors);
	IDEDevice[DeviceNum].DriverType=DRIVER_TYPE_HDD;
	return(0);
}