halsdif.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:      	halsdif.c
*
* Programmer:    	Greg 
*
* Created: 	 	1/2/2008
*
* Description: 		public functions 
*              
*        
* Change History (most recent first):	2008.1.2
****************************************************************/
#include "va4010reg.h"
#include "utiltypedef.h"
#include "common.h"
//#include "halsd.h"

#ifdef ENABLE_SD_CARD

#if (BOARD_ID == EVB_V1)
sbit SDCD = P3^5;
#define SDCD_ENABLE()		(P3_DDR &= ~(1<<5)) 	
#elif(BOARD_ID == HX_001)
sbit SDCD = P3^0;
#define SDCD_ENABLE()		(P3_DDR &= ~(1<<0)) 	

#endif

#define SD_DETECT_TIMES    2
#define SD_DETECT_INTERVAL    1   //DelayMs();

//This function has something to do with the pin assign. So this function will be open to our customer.
BYTE halSDCheck(void)
{
	BYTE data iCnt;
	BYTE data bRet = TRUE;
#ifdef SD_CHECK_ENABLE

	//Set SDCD PIN as input
	SDCD_ENABLE();

	for(iCnt=0; iCnt<SD_DETECT_TIMES; iCnt++)
	{
		if(SDCD != 0)
		{
			bRet = FALSE;
			break;
		}
		DelayMs(SD_DETECT_INTERVAL);
	}
	//WDT = 0x1f;
#endif
	return bRet;
}

BYTE halSDInfo(void)
{
	return BLKSIZE_512_EXP;//The exponent of 512B block.
}

#endif