scsiread10.c

来自「在51下的外挂硬盘和FLASH的MP3方案程序以及原理图」· C语言 代码 · 共 43 行

#ifndef _SCSI_DEFINE
 #include "SCSI.c"
#endif

void SCSIRead10(void)
{
	data WORD i;
	data BYTE m,n;
	xdata BYTE *sector;

	xdata struct SCSIRead10Str *SCSICmdRead10=SCSICBW->CBWCB;

	while (!IDEStatus(IDE_STATUS_BSY,IDE_WAIT,FALSE,255));
	while (!IDEStatus(IDE_STATUS_DRDY,IDE_WAIT,TRUE,255));
	sector=(BYTE *)&SCSICmdRead10->LBA;
//	printf("read sector:%08lx,%02bx...",*(DWORD *)sector,(BYTE)SCSICmdRead10->Length);
	IDE_WRITE_LSB(IDE_ADDR_CMD_LBA0,sector[3]);
	IDE_WRITE_LSB(IDE_ADDR_CMD_LBA1,sector[2]);
	IDE_WRITE_LSB(IDE_ADDR_CMD_LBA2,sector[1]);
	IDE_WRITE_LSB(IDE_ADDR_CMD_LBA3,0xe0|(sector[0]&0x0f));
	IDE_WRITE_LSB(IDE_ADDR_CMD_SECCNT,(BYTE)(SCSICmdRead10->Length));
	IDE_WRITE_LSB(IDE_ADDR_CMD_COMMAND,IDE_CMD_READ);

	UEPNUM=0x02;
	for(i=0;i<SCSICmdRead10->Length;i++)
	{
		while (!IDEStatus(IDE_STATUS_BSY,IDE_WAIT,FALSE,255));
		while (!IDEStatus(IDE_STATUS_DRDY,IDE_WAIT,TRUE,255));
		for(m=0;m<8;m++)
		{
			SET_BIT_7(UEPSTAX);						//设置DIR
			for(n=0;n<32;n++)
			{
				
				IDE_READ_WORD(IDE_ADDR_CMD_DATA,UEPDATX,UEPDATX);
			}
			SET_BIT_4(UEPSTAX);						//设置TXRDY
			while(!( UEPSTAX & 0x01 ));				//等待TXCMP
			CLEAR_BIT_0(UEPSTAX);					//清除TXCMP
		}
	}
}