一个完整的DS1302时钟在STM32上的应用实例

一个完整的DS1302时钟在STM32上的应用(代码位置有点乱）.

一个完整的DS1302时钟在STM32上的应用

/*DS1302时钟芯片*/
uint8_t read[] = {0x81,0x83,0x85,0x87,0x89,0x8b,0x8d};//读秒、分、时、日、月、周、年的寄存器地址 
uint8_t write[] = {0x80,0x82,0x84,0x86,0x88,0x8a,0x8c};//写秒、分、时、日、月、周、年的寄存器地址
uint8_t start_time2[8]={0,0,10,5,5,6,18};//初始化时间：2018年5月5号10:00:00星期六

//I/O定义
void GPIO_Configuration(void) 
{
    GPIO_InitTypeDef GPIO_InitStructure;
    //DS1302时钟定义
    //SCLK
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    GPIO_ResetBits(GPIOB, GPIO_Pin_12);

    //RST
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_ResetBits(GPIOA, GPIO_Pin_0);

    /*IO:PB2配置为开漏模式，此模式下能够实现真正的双向IO口*/
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    GPIO_ResetBits(GPIOB, GPIO_Pin_2);
}


//my_itoa：整数转换成相应的字符串
void my_itoa(long i, char *string)  
{  
    int power = 0, j = 0;  
  
    j = i;  
    for (power = 1; j>10; j /= 10)  
        power *= 10;  
  
    for (; power>0; power /= 10)  
    {  
        *string++ = '0' + i / power;  
        i %= power;  
    }  
    *string = '\0';  
    //printf("%s\n", string);  
}  


//标准时间转换成时间戳
long GetTick(char *str_time)  
{  
    struct tm stm;  
    int iY, iM, iD, iH, iMin, iS;  
  
    memset(&stm,0,sizeof(stm)); 
    
    iY = atoi(str_time);  
    iM = atoi(str_time+5);  
    iD = atoi(str_time+8);  
    iH = atoi(str_time+11);  
    iMin = atoi(str_time+14);  
    iS = atoi(str_time+17);
    
    stm.tm_year=iY-1900;  
    stm.tm_mon=iM-1;  
    stm.tm_mday=iD;  
    stm.tm_hour=iH-8;//注意时区转换  
    stm.tm_min=iMin;  
    stm.tm_sec=iS;  
  
    /*printf("%d-%0d-%0d %0d:%0d:%0d\n", iY, iM, iD, iH, iMin, iS);*/ 
    return mktime(&stm);  
}

//写一个字节的数据sck上升沿写数据
void write_1302byte(uint8_t dat)                             
{  
    uint8_t i = 0;  
    GPIO_ResetBits(GPIOB,GPIO_Pin_12); //ds1302clk=0  
    delay_us(2);//延时大约2us  
    //my_delay_us(1);
      
    for(i = 0;i < 8;i ++)  
        {  
            GPIO_ResetBits(GPIOB,GPIO_Pin_12);   //ds1302clk=0;  
            if(dat&0x01)  
                GPIO_SetBits(GPIOB,GPIO_Pin_2);  
            else                            //ds1302dat=(dat&0x01)  
                GPIO_ResetBits(GPIOB,GPIO_Pin_2);                  
            delay_us(2); 
            //my_delay_us(1);
            GPIO_SetBits(GPIOB,GPIO_Pin_12);    //发送一位数据，clk上升沿,//ds1302clk=1  
            dat >>= 1;  
            delay_us(1);
            //my_delay_us(1);
        }     
}


//向DS1302指定寄存器写入一个字节的数据
void write_1302(uint8_t add,uint8_t dat)                            
{  
    GPIO_ResetBits(GPIOA,GPIO_Pin_0); //只有在rst为高电平的时候才能进行数据传输  
    GPIO_ResetBits(GPIOB,GPIO_Pin_12); //只有clk为低电平的时候，rst才能被置为高电平  
    //ds1302rst=0;  
    //ds1302clk=0;  
    delay_us(1);                     //略微延时  
    //my_delay_us(1);
    GPIO_SetBits(GPIOA,GPIO_Pin_0);   //clk = 0之后，这里将rst拉高，准备传送数据  
    //ds1302rst=1;  
    delay_us(2);                     //时间大约2us 
    //my_delay_us(1);
    write_1302byte(add);             //先发地址  
    write_1302byte(dat);             //然后发数据  
    GPIO_ResetBits(GPIOA,GPIO_Pin_0); //这里释放总线  
    GPIO_ResetBits(GPIOB,GPIO_Pin_12); //拉低clk，以备下一次数据发送  
    //ds1302clk=0;  
    //ds1302rst=0;  
    delay_us(5);  
    //my_delay_us(1);
  
} 


//从DS1302指定寄存器读数据
uint8_t read_1302(uint8_t add)                     
{  
    uint8_t i=0;  
    uint8_t Return_dat = 0x00;  
    GPIO_ResetBits(GPIOA,GPIO_Pin_0);            //ds1302rst=0;  
    GPIO_ResetBits(GPIOB,GPIO_Pin_12);           //ds1302clk=0;  
    delay_us(3);                                 //略微延时2us  
    //my_delay_us(1);
    GPIO_SetBits(GPIOA,GPIO_Pin_0);             //ds1302rst=1;  
    delay_us(3);                                //时间要大约3us  
   // my_delay_us(1);
    write_1302byte(add);                       //先写寄存器的地址  
    for(i=0;i<8;i++)  
    {  
        GPIO_SetBits(GPIOB,GPIO_Pin_12);       //ds1302clk=1; 
        delay_us(5);
        //my_delay_us(1);
        Return_dat >>= 1;  
        delay_us(5);
        //my_delay_us(1);
        GPIO_ResetBits(GPIOB,GPIO_Pin_12);     //ds1302clk=0;//拉低时钟线，以便于数据的读入  
        if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_2)==1)    //数据线此时为高电平  
        {Return_dat = Return_dat|0x80;}  
    }  
        delay_us(1);
        //my_delay_us(1);
      GPIO_ResetBits(GPIOA,GPIO_Pin_0);        //ds1302rst=0;释放总线  
      return Return_dat;  
}

//初始化1302
void ds1302_init(uint8_t *write,uint8_t *time)                
{  
    uint8_t i=0,j=0;  
    write_1302(0x8e,0x00);                  //关闭写保护  
    
    for(i=0;i<7;i++)                        //十进制转BCD码  
    {  
        j=time[i]%10;                       //个位数部分  
        time[i]=(time[i]/10)*16+j;    
    }  
    for(i=0;i<7;i++)                        //进行对时  
    {  
        write_1302(write[i],time[i]);      //在对应寄存器上写入对应的十六进制数据  
    }  
    write_1302(0x8e,0x80);                 //打开写保护  
} 

//从DS1302中读取出时间赋给myTime（硬件系统时间）
void ds1302_data(uint8_t *read)                                               
{  
    write_1302(0x8e,0x00);            //关闭写保护
    write_1302(0x8e,0x80);            //打开写保护 
    uint8_t i=0,g[7],time[7]; 
    static uint8_t s=1; 
    for(i=0;i<7;i++)  
    {  
        time[i]=read_1302(read[i]);          //读数据已经完成  
    }  
    for(i=0;i<7;i++)  
    {  
        g[i]=time[i]%16;                     //秒个位数据:BCD转十进制  
        time[i]=time[i]/16;                  //秒十位数据  
    }  
    //此时已转换成10进制数，g[i]里面存放的是秒分时日月周年的各个位数据
    //而此时的time【i】里面存放的则是秒分时日月周年的十位数据
    
   if(s!=(time[0]+g[0]))
   ACCLOG("DS1302 time is 20%d%d %d%d %d%d %d%d:%d%d:%d%d %d\n",time[6],g[6],time[4],g[4],time[3],g[3],time[2],g[2],time[1],g[1],time[0],g[0],g[5]);  
   s=time[0]+g[0];  
   
  char str_time[20];

  str_time[0] = '2';
  str_time[1] = '0';
  //N2Char():整数转字符串
  str_time[2] = N2Char((int)(time[6]));
  str_time[3] = N2Char((int)g[6]);
  str_time[4] = 32;                    
  str_time[5] = N2Char((int)time[4]);                        
  str_time[6] = N2Char((int)g[4]);                    
  str_time[7] = 32;                         
  str_time[8] = N2Char((int)time[3]);                     
  str_time[9] = N2Char((int)g[3]);                       
  str_time[10] = 32;                   
  str_time[11] = N2Char((int)time[2]);                       
  str_time[12] = N2Char((int)g[2]);                    
  str_time[13] = 32;                         
  str_time[14] = N2Char((int)time[1]);
  str_time[15] = N2Char((int)g[1]);
  str_time[16] = 32; 
  str_time[17] = N2Char((int)time[0]);
  str_time[18] = N2Char((int)g[0]);
   
  long ConfigureCodeTime = GetTick(str_time);  //ConfigureCodeTime中放的是时间戳
  ACCLOG("\nDS1302 turn to Timestamp is:%ld\n",ConfigureCodeTime); 
  // myTime[11] = ConfigureCodeTime;
  //memset((char *) &myTime, 0, sizeof(myTime));
  my_itoa(ConfigureCodeTime,myTime); //再把ConfigureCodeTime保存的时间戳赋给myTime数组
  ACCLOG("myTime is:%ld\n",ConfigureCodeTime); 
  //itoa(ConfigureCodeTime, myTime, 10);
}