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/*------------------------------------------------------------------------------------------
[文件名] Sd.c
[功能] 對sd2001時鐘進行時實讀寫,并對其內(nèi)部的ram進行操作
[版本] 1.4b
[作者] 鞠春陽
[最后修改時間] 2003年5月12日
[版權(quán)所有] www.mcuzb.com
[sd2001資料] 請到www.mcuzb.com下載
===========================================================================================*/
//用戶調(diào)用函數(shù)
//void initSD2001Time(unsigned char year,unsigned char month,unsigned char day,unsigned char date,unsigned char hour,unsigned char minute,unsigned char second)
//時鐘初始化函數(shù) 年,月,日,星期,小時,分鐘,秒
//ReadSD2001_Time()
//讀時間函數(shù) 結(jié)果分別存放在全局變量 SD2001_year SD2001_month ;SD2001_day ;SD2001_date ;SD2001_hour ;SD2001_minute;SD2001_second;中</P><P>

#include "reg51.h"
#include "intrins.h"

sbit SD2001_SDA= P2^1;
sbit SD2001_SCL= P2^3;
sbit SCLE = P1^5;
sbit SDAE = P1^4;#define SomeNOP(); { _nop_(); _nop_(); _nop_();_nop_(); }
unsigned char SD2001_year ;
unsigned char SD2001_month ;
unsigned char SD2001_day ;
unsigned char SD2001_date ;
unsigned char SD2001_hour ;
unsigned char SD2001_minute;
unsigned char SD2001_second;
unsigned char LishiSRAM[7];
/*--------------------------------------------------------------------------------
調(diào)用方式：void SD2001_I2CStart(void) ﹫2001/07/0 4
函數(shù)說明：私有函數(shù),I2C專用
---------------------------------------------------------------------------------*/
void SD2001_I2CStart(void)
{
EA=0;
SD2001_SCL=0;
SD2001_SDA=1; SomeNOP();
SD2001_SCL=1; SomeNOP();//INI
SD2001_SDA=0; SomeNOP(); //START
SD2001_SCL=0;
}</P><P>void I2CStartRAM(void)
{
EA=0;
SCLE=0;
SDAE=1; SomeNOP();
SCLE=1; SomeNOP();//INI
SDAE=0; SomeNOP(); //START
SCLE=0;
}
/*--------------------------------------------------------------------------------
調(diào)用方式：void SD2001_I2CStop(void) ﹫2001/07/0 4
函數(shù)說明：私有函數(shù),I2C專用
---------------------------------------------------------------------------------*/
void SD2001_I2CStop(void)
{
SD2001_SDA=0;
SD2001_SCL=0; SomeNOP(); //INI
SD2001_SCL=1; SomeNOP();
SD2001_SDA=1; SomeNOP();//STOP
SD2001_SCL=0;
EA=1;
}</P><P>void I2CStopRAM(void)
{
SDAE=0;
SCLE=0; SomeNOP(); //INI
SCLE=1; SomeNOP();
SDAE=1; SomeNOP();//STOP
SCLE=0;
EA=1;
}
/*--------------------------------------------------------------------------------
調(diào)用方式：void I2CSend(unsigned char ch) ﹫2001/07/0 5
函數(shù)說明：私有函數(shù),I2C專用
MSB
---------------------------------------------------------------------------------*/
void SD2001_I2CSendByte(unsigned char ch)
{
unsigned char i=8;
while(i--)
{
SD2001_SCL=0;_nop_();
SD2001_SDA=(bit)(ch&0x80); ch<<=1; SomeNOP();
SD2001_SCL=1; SomeNOP();
}
SD2001_SCL=0;
// WaitAck();
}
/*--------------------------------------------------------------------------------
調(diào)用方式：void I2CSend(unsigned char ch) ﹫2001/07/0 5