最开始将函数从51单片机移植过来，如何整都读取出来的数据是65，不是实时时钟数据，查了下手册，发现必须4.5V-5.5V供电才可以，没有办法，跳线解决，但SCL与SDA采用3.3V+10K电阻上拉倒没有问题；
读取函数设置如下(PB12 PB13)：
//初始化IIC
void IIC_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE );
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12|GPIO_Pin_13;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP ;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB,GPIO_Pin_12|GPIO_Pin_13);
}
//IO方向设置;
#define IIC_SDA_PORT GPIOB
#define IIC_SDA_IO GPIO_Pin_13
#define IIC_SDA_RCC RCC_APB2Periph_GPIOB
#define SDA_IN() {IIC_SDA_PORT->CRH&=0XFF0FFFFF;IIC_SDA_PORT->CRH|=0x00800000;}
#define SDA_OUT() {IIC_SDA_PORT->CRH&=0XFF0FFFFF;IIC_SDA_PORT->CRH|=0x00300000;}
#define IIC_SCL_PORT GPIOB
#define IIC_SCL_IO GPIO_Pin_12
#define IIC_SCL_RCC RCC_APB2Periph_GPIOB
#define IIC_SCL_PORT GPIOB
#define IIC_SCL_IO GPIO_Pin_12
#define IIC_SCL_RCC RCC_APB2Periph_GPIOB
//²úÉúIICÆðʼÐźÅ
void IIC_Start(void)
{
SDA_OUT(); //sdaÏßÊä³ö
IIC_SDA=1;
IIC_SCL=1;
delay_us(8);
IIC_SDA=0;//START:when CLK is high,DATA change form high to low
delay_us(8);
IIC_SCL=0;
}
void IIC_Stop(void)
{
SDA_OUT();
IIC_SCL=0;
IIC_SDA=0;//STOP:when CLK is high DATA change form low to high
delay_us(8);
IIC_SCL=1;
IIC_SDA=1;
delay_us(8);
}
u8 IIC_Wait_Ack(void)
{
u8 ucErrTime=0;
SDA_IN();
IIC_SDA=1;delay_us(4);
IIC_SCL=1;delay_us(4);
while(READ_SDA)
{
ucErrTime++;
if(ucErrTime>250)
{
IIC_Stop();
return 1;
}
}
IIC_SCL=0;//ʱÖÓÊä³ö0
return 0;
}
//²úÉúACKÓ¦´ð
void IIC_Ack(void)
{
IIC_SCL=0;
SDA_OUT();
IIC_SDA=0;
delay_us(8);
IIC_SCL=1;
delay_us(8);
IIC_SCL=0;
}
//²»²úÉúACKÓ¦´ð
void IIC_NAck(void)
{
IIC_SCL=0;
SDA_OUT();
IIC_SDA=1;
delay_us(4);
IIC_SCL=1;
delay_us(4);
IIC_SCL=0;
}
//IIC·¢ËÍÒ»¸ö×Ö½Ú
//·µ»Ø´Ó»úÓÐÎÞÓ¦´ð
//1£¬ÓÐÓ¦´ð
//0£¬ÎÞÓ¦´ð
void IIC_Send_Byte(u8 txd)
{
u8 t;
SDA_OUT();
IIC_SCL=0;//ÀµÍʱÖÓ¿ªÊ¼Êý¾Ý´«Êä
for(t=0;t<8;t++)
{
//IIC_SDA=(txd&0x80)>>7;
if((txd&0x80)>>7)
IIC_SDA=1;
else
IIC_SDA=0;
txd<<=1;
delay_us(6); //¶ÔTEA5767ÕâÈý¸öÑÓʱ¶¼ÊDZØÐëµÄ
IIC_SCL=1;
delay_us(4);
IIC_SCL=0;
delay_us(4);
}
}
//¶Á1¸ö×Ö½Ú£¬ack=1ʱ£¬·¢ËÍACK£¬ack=0£¬·¢ËÍnACK
u8 IIC_Read_Byte(unsigned char ack)
{
unsigned char i,receive=0;
SDA_IN();//SDAÉèÖÃΪÊäÈë
for(i=0;i<8;i++ )
{
IIC_SCL=0;
delay_us(4);
IIC_SCL=1;
receive<<=1;
if(READ_SDA)receive++;
delay_us(2);
}
if (!ack)
IIC_NAck();//·¢ËÍnACK
else
IIC_Ack(); //·¢ËÍACK
return receive;
}
unsigned char Write1307(unsigned char add,unsigned char dat)//дһ×Ö½Úµ½¶ÔÓ¦µØÖ·È¥
{
unsigned char temp;
temp=dat/10;
temp<<=4;
temp=dat%10+temp;
IIC_Start();
IIC_Send_Byte(0xD0);
IIC_Wait_Ack();
IIC_Send_Byte(add);
IIC_Wait_Ack();
IIC_Send_Byte(temp);
IIC_Stop();
return (0);
}
unsigned char Read1307(unsigned char add)
{
unsigned char temp;
unsigned char dat;
IIC_Start();
IIC_Send_Byte(0xD0);
IIC_Wait_Ack();
IIC_Send_Byte( add);
IIC_Wait_Ack();
IIC_Stop();
IIC_Start();
IIC_Send_Byte(0xD1);
IIC_Wait_Ack();
dat=IIC_Read_Byte(add);
IIC_NAck();
IIC_Stop();
temp=dat/16;
dat=dat%16;
dat=dat+temp*10;
return(dat);
}
void NOW_RTC_TIME(void)
{
second=Read1307(0x00);
minute=Read1307(0x01);
hour=Read1307(0x02);
week=Read1307(0x03);
date=Read1307(0x04);
month=Read1307(0x05);
year=Read1307(0x06);
}
经过把电压调整至5V之后，问题解决，如果首次使用，还必须读取秒的值看是否是second&0X80，然后设置一次时钟即可；
Write1307(0x00,0x01); //设置秒
Write1307(0x01,32);
Write1307(0x02,0x03);
Write1307(0x03,0x00);
Write1307(0x04,0x0B);
Write1307(0x05,0x04);
Write1307(0x06,0x14);//设置年
至此OL了,技术使人快乐，分享点滴，共同进步~Q~Q~417179642
