【MSP430超低功耗时钟】DS1302的读写程序

只看该作者 · 2011-12-19 22:18

可用的MSP430读DS1302程序，大家用时改下脚管就行
/**********************************************************/
//MSP430高级实验开发组件 - DS1302时钟芯片
//硬件连接:
////    MSP430 MCU                DS1302
//// ------------------       ------------------
//// |    P15    | ------> |    SCLK    |
//// |    P17    | ------> |    RST    |
//// |    P16    | ------> |    SDI    |
//// ------------------       ------------------
////    MSP430 MCU                KEYS
//// ------------------       ------------------
//// ------------------       ------------------
//当前演示程序功能描述:
////
/*********************************************************/
#include
#define DS1302_DIR  P1DIR
#define DS1302_IN P1IN
#define DS1302_OUT  P1OUT
#define DS1302_RST  BIT7
#define DS1302_SCLK  BIT5
#define DS1302_SDI  BIT6  //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 Setting_Time[7]={ //bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
0x08, //--------十位-------|-------个位--------|年份(当前07年)
0x01, //                      |-----个位-----|星期(当前周日)
0x04, //             |十位|-------个位--------|月份(当前07月)
0x15, //       |--十位---|-------个位--------|日期(当前01号)
0x11, //-12H| |--十位---|-------个位--------|小时(当前18点)
0x09, // |-----十位-----|-------个位--------|分钟(当前20分)
0x21 // |-----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
/****************************
void main(void) {
WDTCTL = WDTPW + WDTHOLD;
DS1302_Reset();
//DS1302_SettingData();
while(1){
  DS1302_GetData(ReadingData);
  _NOP();
};
}
****************************/
//延时函数
void DS1302_Delay(unsigned int dtime) {
unsigned int temp;
for(temp=0;temp<DTIME;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<8;temp++){rdata >>= 1;//将移位放到前面，否则读不到最高一位
  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,Setting_Time[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;
}
}
void main(void)
{
  unsigned char time1[7];
  WDTCTL = WDTPW + WDTHOLD;          // Stop WDT
  BTCTL = BTFRFQ1+BT_ADLY_500;  ;          // ACLK/(256*16)

  DS1302_Reset();
  while(1)
  {
DS1302_GetData(time1);
DS1302_SettingData();
DS1302_GetData(time1);
  }
}