DS1302时钟芯片的MSP430程序

////DS1302 Trickle Charge Timekeeping Chip

//MSP430高级实验开发组件 - DS1302时钟芯片
//时钟设置:
////ACLK=N/A,MCLK=SMCLK=default(DCO~800k)
//硬件连接:
////       MSP430 MCU                   DS1302
////   ------------------         ------------------
////   |      P20       | ------> |     SCLK       |
////   |      P21       | ------> |      RST       |
////   |      P22       | ------> |      SDI       |
////   ------------------         ------------------
////       MSP430 MCU                   KEYS
////   ------------------         ------------------
////   ------------------         ------------------ 
//当前演示程序功能描述:
////

#include

#define DS1302_DIR  P2DIR
#define DS1302_IN  P2IN
#define DS1302_OUT  P2OUT

#define DS1302_RST  BIT1
#define DS1302_SCLK  BIT0
#define DS1302_SDI  BIT2  //定义MSP320的端口

#define DS1302_RST_LO  DS1302_OUT &= ~DS1302_RST
#define DS1302_RST_HI  DS1302_OUT |= DS1302_RST
#define DS1302_SCLK_LO  DS1302_OUT &= ~DS1302_SCLK
#define DS1302_SCLK_HI  DS1302_OUT |= DS1302_SCLK
#define DS1302_SDI_LO  DS1302_OUT &= ~DS1302_SDI
#define DS1302_SDI_HI  DS1302_OUT |= DS1302_SDI

void DS1302_Delay(unsigned int dtime);
void DS1302_Reset(void);
void DS1302_WriteOneByte(unsigned char w_dat);
void DS1302_WriteData(unsigned char addr,unsigned char w_dat);
void DS1302_SettingData(void);
void DS1302_GetData(unsigned char *str);
unsigned char DS1302_ReadOneByte(void);
unsigned char DS1302_ReadData(unsigned char addr);

unsigned char SettingData[7]={ //bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
 0x07,    //--------十位-------|-------个位--------|年份(当前07年)
 0x07,    //                        |-----个位-----|星期(当前周日)
 0x07,    //              |十位|-------个位--------|月份(当前07月)
 0x01,    //         |--十位---|-------个位--------|日期(当前01号)
 0x18,    //-12H|    |--十位---|-------个位--------|小时(当前18点)
 0x20,    //    |-----十位-----|-------个位--------|分钟(当前20分)
 0x30    //    |-----十位-----|-------个位--------|秒钟(当前30秒)
};
unsigned char ReadingData[7];  //读出来的数据,同SettingData定义与格式

//延时函数
void DS1302_Delay(unsigned int dtime) {
 unsigned int temp;
 for(temp=0;temp }

//DS1302复位
void DS1302_Reset(void) {
 DS1302_DIR |= (DS1302_RST + DS1302_SCLK);
 DS1302_SCLK_LO;
 DS1302_RST_LO;
 DS1302_Delay(10);
 DS1302_SCLK_HI;
}

//向DS1302写入一个字节
void DS1302_WriteOneByte(unsigned char w_dat) {
 unsigned char temp;
 
 DS1302_RST_HI;
 DS1302_DIR |= DS1302_SDI;
 
 for(temp=8;temp>0;temp--) {
  DS1302_SDI_LO;
  if(w_dat&BIT0) DS1302_SDI_HI;
  DS1302_SCLK_LO;
  DS1302_Delay(10);
  DS1302_SCLK_HI;
  DS1302_Delay(10);
  w_dat >>=1;
 }
}

//从DS1302中读取一个字节
unsigned char DS1302_ReadOneByte(void) {
 unsigned char temp,rdata;
 rdata = 0x00;
 
 DS1302_RST_HI;
 DS1302_DIR &= ~DS1302_SDI;
 
 for(temp=0;temp<7;temp++){
  DS1302_SCLK_HI;
  DS1302_Delay(10);
  DS1302_SCLK_LO;
  DS1302_Delay(10);
  if((DS1302_IN&DS1302_SDI)==DS1302_SDI)
   rdata |= BIT7;
  rdata >>= 1;
 }
 
 return(rdata);
}

//向DS1302中写入地址后写入数据
void DS1302_WriteData(unsigned char addr,unsigned char w_dat) {
 DS1302_RST_LO;
 DS1302_SCLK_LO;
 DS1302_RST_HI;
 
 DS1302_WriteOneByte(addr);  //写入地址
 DS1302_WriteOneByte(w_dat);  //写入数据
 
 DS1302_SCLK_HI;
 DS1302_RST_LO;
}

//向DS1302写入地址后,从DS1302中读取数据
unsigned char DS1302_ReadData(unsigned char addr) {
 unsigned char r_dat;
 DS1302_RST_LO;
 DS1302_SCLK_LO;
 DS1302_RST_HI;
 
 DS1302_WriteOneByte(addr);  //写入地址
 r_dat = DS1302_ReadOneByte();  //读出数据
 
 DS1302_SCLK_LO;
 DS1302_RST_LO;
 
 return(r_dat);
}

//按照SettingData的设置设置DS1302的时间
void DS1302_SettingData(void) {
 unsigned char temp;
 unsigned char addr = 0x8C;
 
 DS1302_WriteData(0x8E,0x00);  //写入控制命令,禁用写保护

 for(temp=0;temp<7;temp++) {
  DS1302_WriteData(addr,SettingData[temp]);
  addr -= 2;
 }
 
 DS1302_WriteData(0x8E,0x80);  //写入控制命令,启用写保护
}

//读取DS1302时间到ReadingData中
void DS1302_GetData(unsigned char *str) {
 unsigned char temp;
 unsigned char addr = 0x8D;

 for(temp=0;temp<7;temp++) {
  str[temp] = DS1302_ReadData(addr);//年
  addr -= 2;
 }
}