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);
}