idesetcurrentdevice.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

void IDESetCurrentDevice(BYTE DeviceNum);

void IDESetCurrentDevice(BYTE DeviceNum)
{
	if (DeviceNum==IDE_DEVICE_SLAVE&&IDE.TotalDevices==2)
	{
		IDE.CurrentDevice=IDE_DEVICE_SLAVE;
	   	if (!IDEStatus(IDE_STATUS_BSY,IDE_WAIT,FALSE,255)) return;
		IDE_WRITE_LSB(IDE_ADDR_CMD_HEAD,0xb0);
	}
	else
	{
		IDE.CurrentDevice=IDE_DEVICE_MASTER;
	   	if (!IDEStatus(IDE_STATUS_BSY,IDE_WAIT,FALSE,255)) return;
		IDE_WRITE_LSB(IDE_ADDR_CMD_HEAD,0xa0);
	}
}