haldevchk.c

威望公司MP3 + USB MCU 的参考软件

/****************************************************************
*                      Viaon Technology (Suzhou) Co.,Ltd
*
*    Copyright 2007, Viaon Technology (Suzhou) Co.,Ltd,Suzhou,China
*                    All rights reserved.
*
*
* Filename:      	haldevchk.c
*
* Programmer:    	Greg 
*
* Created: 	 	1/2/2008
*
* Description: 		public functions 
*              
*        
* Change History (most recent first):	2008.1.2
****************************************************************/

#include "haldevchk.h"
#include "libdrive.h"

/*static*/ BYTE data bDEVFlag;
/*static*/ BYTE DEVAttach[2] = {USB_ATTACHED, SD_ATTACHED};

#ifdef ENABLE_DEVICE_DETECT


static BYTE DEVDisattach[2] = {USB_DISATTACHED, SD_DISATTACHED};
static BYTE FSMSta[2] = {FSMSTATE_USB, FSMSTATE_SD};

//For DEV_CHECK_ANOTHER
//Return FALSE, if another device is disattached.
//Return TRUE, if another device is attached.
//For DEV_CHECK_CUR
//Return FALSE, if current device is disattached.
//Return TRUE, if current device is not disattached.
BYTE halDevCheck(BYTE bDev, BYTE bFlag) //Check if the other device is attached/disattached.
{
	BYTE data bRet;

	if(bFlag == DEV_CHECK_ANOTHER){
		if((bDev==USB_DISK)){ //Current device is USB, check SD
			bRet = halSDCheck();
			//UartOutText("current USB,check SD\r\n");
		}else{//Current device is SD, so check USB
			//UartOutText("current SD,check USB\r\n");
			bRet = halUsbCheck();
		}
		
	}else{	//DEV_CHECK_CUR
		if((bDev==USB_DISK)){ //Current device is USB
			bRet = halUsbChkReg();
		}else{//Current device is SD
			bRet = halSDCheck();
		}

	}

	return bRet;
}


//This function can only be called when device is attached and enumerated.
void halDevPnP()
{
	DRIVE *drv = DriveGet();

	if(bgDevChkGap < DEV_CHECK_GAP){
		return;
	}
	bgDevChkGap = 0;	

	if(mp3status == MP3STATUS_PAUSE){ //Check current device
#if 1	
		if(halDevCheck(drv->DevID, DEV_CHECK_CUR) == FALSE){
			UartOutText("Current device removed\r\n");
			FSMState = FSMSTATE_USB;
			//FSMState = FSMSta[drv->DevID];
		}
#endif		
	}
	#if 1
	else{
		//Chech the dis-attachment of another device
		if(halDevCheck(drv->DevID, DEV_CHECK_ANOTHER) == FALSE){ //Check the another device according to the current device
			//UartOutText("-I-: Another Dev Disattached \r\n");
			bDEVFlag = DEVDisattach[drv->DevID];
		}
		//Check the attachment of another device after dis-attachment
		if((bDEVFlag == DEVDisattach[drv->DevID])&&(halDevCheck(drv->DevID, DEV_CHECK_ANOTHER) == TRUE)){
			FSMState = FSMSta[drv->DevID];
			//bDEVFlag = DEVAttach[drv->DevID];;
			UartOutText("-I-: Another Dev attached \r\n");
			//drv = NULL;
		}	
	}	
     #endif
	return;
}

#endif