idepowermanagement.c

来自「用C51单片机实现的MP3播放器的c代码程序。」· C语言 代码 · 共 18 行

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

void IDEPowerManagement(BYTE cmd);

void IDEPowerManagement(BYTE cmd)
{
	if (cmd==IDE_POWER_SLEEP) cmd=IDE_CMD_SLEEP;
	else if (cmd==IDE_POWER_IDLE) cmd=IDE_CMD_IDLE_IMMEDIATE;
	else if (cmd==IDE_POWER_STANDBY) cmd=IDE_CMD_STANDBY;
	else return;

 	if (!IDEStatus(IDE_STATUS_BSY,IDE_WAIT,FALSE,255)) return;
	IDE_WRITE_LSB(IDE_ADDR_CMD_HEAD,0xa0|IDE.CurrentDevice);
	IDE_WRITE_LSB(IDE_ADDR_CMD_COMMAND,cmd);
}