initiator_mode_req_sen.c

基于FAS466的SCSI控制器的启动器模式的C源代码。

#define	GLB extern

#include <stdio.h>
#include <conio.h>
#include <sys\types.h>
#include <sys\timeb.h>
#include <time.h>
#include <stdlib.h>
#include <string.h>
#include <dos.h>

#include "fas466defs.h"
#include "fas466regs.h"
#include "fas466globalvars.h"

void Initiator_Mode_req_sen()
{

// set up some vars to handle the loop below
        unsigned char req_sen_i = 0x0;
        unsigned char req_sen_value = 0x0;
        unsigned char req_sen_x = 0x0;
		unsigned int temp1, temp2;
        RegWrite(SC_Command , 01);

        printf("  Request Sense Data\n"); 

	RegWrite(SC_FIFO , 0x80) ;  // msg1
    RegWrite(SC_FIFO , 0x3) ;  // cdb1
	RegWrite(SC_FIFO , 0x0) ;  // cdb2
	RegWrite(SC_FIFO , 0x0) ;  // cdb3
	RegWrite(SC_FIFO , 0x0) ;  // cdb4
    RegWrite(SC_FIFO , 0xff) ; // cdb5
	RegWrite(SC_FIFO , 0x0) ;  // cdb6

    verify (SC_FIFO_Count  , 0x7) ;
	printf("      Issue SelWAtn Command 1 messages\n");
        RegWrite(SC_Command , SC_CMD_Select1_With_ATN_Seq); //
		ExpCmdCmptStat = SC_Function_Complete;	
		Cmd_Complete466();
		
        verify (SC_Command_Status , 0x9); // SC_STS_SeqStep_9) ;
        verifym(SC_SCSI_Control ,  SC_CTRL_PhaseMask  ,  SC_CTRL_DataInPhase) ;

//      RegWrite(SC_Command , 0x98);
//		ExpCmdCmptStat = SC_Bus_Service;	
//		Cmd_Complete466();


     // receive the additional sense data
        req_sen_i = 0;
        RegWrite(SC_Command , 0x98);
		ExpCmdCmptStat = SC_Bus_Service;	
		Cmd_Complete466();

        RegWrite(SC_Command , 01);

        RegWrite(SC_Command , SC_CMD_Xfer_Information_Non_DMA);
		ExpCmdCmptStat = SC_Function_Complete | SC_Bus_Service;	
		Cmd_Complete466();

        RegWrite(SC_Command , SC_CMD_Xfer_Information_Non_DMA);
		ExpCmdCmptStat = SC_Function_Complete;	
		Cmd_Complete466();

        RegWrite(SC_Command , SC_CMD_Message_Accepted);
		ExpCmdCmptStat = SC_Function_Complete | SC_SCSI_Disconnect;	
	    Cmd_Complete466();

        // read the status/message from the fifo to empty it.
		temp1 = RegRead(SC_FIFO);
		temp2 = RegRead(SC_FIFO);
        printf("Status  = %0x Message = %0x\n", temp1,temp2);


} // Initiator_Mode_req_sen

/*   ***********************************************************

There are many ways to recieve data in this case:

1. Set block size = 0x200, block count = FFFF, use DMA command to
receive data until bus service (target change phase). Check 
SS FIFO Count and add more pad  bytes to make it even boundary before
issue a drain FIFO command to drain data from SC FIFO to DMA. 
External DMA controller need to set up to receice exact data before 
issue the command. After draining, data will land into buffer through
external DMA. This method works for all asynch and synch mode.

2. Use Loop of Non DMA command to receive one byte of data until recieve
a bus service interrupt.Data land into SC FIFO. This method works good 
in asynch mode.  
 

3. Use loop of Non DMA command to recieve a N number of data then issue
Transfer Pad command to regard the rest until target change phase.
This method works good in asynch mode.  

*****************************************************************/