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/****************************************Copyright (c)************************************************** 
**                               Guangzhou ZLG-MCU Development Co.,LTD. 
**                                      graduate school 
**                                 http://www.zlgmcu.com 
** 
**--------------File Info------------------------------------------------------------------------------- 
** File name:			sdhal.h 
** Last modified Date:	2005-3-11 
** Last Version:		V2.0 
** Descriptions:		SD/MMC卡读写模块 ---- SPI操作函数头文件 
**						Soft Packet of SD/MMC Card: hard abstrast layer ---- function of SPI operation  
**																			 header file 
**------------------------------------------------------------------------------------------------------ 
** Created by:			Ming Yuan Zheng 
** Created date:		2005-1-6 
** Version:				V1.0 
** Descriptions:		The original version 
** 
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** Modified by:			 
** Modified date:		 
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** Descriptions:		 
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/* 检测卡是否完全插入  check weather card is insert entirely */ 
extern INT8U SD_ChkCard(void); 
 
/* 检测卡是否写保护  check weather card is write protect */ 
extern INT8U SD_ChkCardWP(void); 
 
/* 初始化访问SD卡的硬件初始化 initialize the hardware that access sd card */ 
extern void SD_HardWareInit(void); 
 
/* 设置SPI的时钟小于400kHZ set the clock of SPI less than 400kHZ */ 
extern void SPI_Clk400k(void); 
 
/* 设置SPI的clock到最大值 set the clock of SPI to maximum */ 
extern void SPI_ClkToMax(void); 
 
/* 通过SPI接口发送一个字节 send a byte by SPI interface */ 
extern void SPI_SendByte(INT8U byte); 
 
/* 从SPI接口接收一个字节 receive a byte from SPI interface */ 
extern INT8U SPI_RecByte(void); 
 
/* 片选SPI从机 select the SPI slave */ 
extern void SPI_CS_Assert(void); 
 
/* 不片选SPI从机 not select the SPI slave */ 
extern void SPI_CS_Deassert(void);