STM32单片机pcf8563程序库函数i2c

ID:154876 · 发表于 2023-12-27 22:57

#include <sys.h>
#include <pcf8563.h>
#include <delay.h>
#define SDA_IN() {GPIOB->CRL&=0X0FFFFFFF;GPIOB->CRL|=(u32)8<<28;}
#define SDA_OUT() {GPIOB->CRL&=0X0FFFFFFF;GPIOB->CRL|=(u32)3<<28;}
//IO操作函数
#define IIC_SCL PBout(6) //SCL
#define IIC_SDA PBout(7) //SDA
#define READ_SDA PBin(7) //输入SDA
//初始化IIC
void IIC_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE ); //使能GPIOB时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP ; //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB,GPIO_Pin_6|GPIO_Pin_7); //PB6,PB7 输出高
}
//产生IIC起始信号
void IIC_Start(void)
{
SDA_OUT(); //sda线输出
IIC_SDA=1;
IIC_SCL=1;
delay_us(4);
IIC_SDA=0;//START:when CLK is high,DATA change form high to low
delay_us(4);
IIC_SCL=0;//钳住I2C总线，准备发送或接收数据
}
//产生IIC停止信号
void IIC_Stop(void)
{
SDA_OUT();//sda线输出
IIC_SCL=0;
IIC_SDA=0;//STOP:when CLK is high DATA change form low to high
delay_us(4);
IIC_SCL=1;
IIC_SDA=1;//发送I2C总线结束信号
delay_us(4);
}
//等待应答信号到来
//返回值：1，接收应答失败
// 0，接收应答成功
u8 IIC_Wait_Ack(void)
{
u8 ucErrTime=0;
SDA_IN(); //SDA设置为输入
IIC_SDA=1;delay_us(1);
IIC_SCL=1;delay_us(1);
while(READ_SDA)
{
ucErrTime++;
if(ucErrTime>250)
{
IIC_Stop();
return 1;
}
}
IIC_SCL=0;//时钟输出0
return 0;
}
//产生ACK应答
void IIC_Ack(void)
{
IIC_SCL=0;
SDA_OUT();
IIC_SDA=0;
delay_us(2);
IIC_SCL=1;
delay_us(2);
IIC_SCL=0;
}
//不产生ACK应答
void IIC_NAck(void)
{
IIC_SCL=0;
SDA_OUT();
IIC_SDA=1;
delay_us(2);
IIC_SCL=1;
delay_us(2);
IIC_SCL=0;
}
//IIC发送一个字节
//返回从机有无应答
//1，有应答
//0，无应答
void IIC_Send_Byte(u8 txd)
{
u8 t;
SDA_OUT();
IIC_SCL=0;//拉低时钟开始数据传输
for(t=0;t<8;t++)
{
if((txd&0x80)>>7)
IIC_SDA=1;
else
IIC_SDA=0;
txd<<=1;
delay_us(2); //对TEA5767这三个延时都是必须的
IIC_SCL=1;
delay_us(2);
IIC_SCL=0;
delay_us(2);
}
}
//读1个字节，ack=1时，发送ACK，ack=0，发送nACK
u8 IIC_Read_Byte(unsigned char ack)
{
unsigned char i,receive=0;
SDA_IN();//SDA设置为输入
for(i=0;i<8;i++ )
{
IIC_SCL=0;
delay_us(2);
IIC_SCL=1;
receive<<=1;
if(READ_SDA)receive++;
delay_us(1);
}
if (!ack)
IIC_NAck();//发送nACK
else
IIC_Ack(); //发送ACK
return receive;
}
void PCF8563_Write_Byte(unsigned char REG_ADD, unsigned char dat)
{
IIC_Start();
IIC_Send_Byte(PCF8563_Write);//发送写命令并检查应答位
while(IIC_Wait_Ack());
IIC_Send_Byte(REG_ADD);
IIC_Wait_Ack();
IIC_Send_Byte(dat); //发送数据
IIC_Wait_Ack();
IIC_Stop();
}
//读取地数据
// reg——add 要读取的寄存器
unsigned char PCF8563_Read_Byte(unsigned char REG_ADD)
{
u8 ReData;
IIC_Start( );
IIC_Send_Byte(PCF8563_Write);//发送写命令并检查应答位
while(IIC_Wait_Ack( ));
IIC_Send_Byte(REG_ADD); //确定要操作的寄存器
IIC_Wait_Ack();
IIC_Start(); //启动总线
IIC_Send_Byte(PCF8563_Read); //发送读取命令
IIC_Wait_Ack();
ReData = IIC_Read_Byte(0); //读取数据，加发送非应答
IIC_Stop();
return ReData;
}
//函数名称：void rtc_set_time(u8 year,u8 month,u8 day,u8 hour,u8 min,u8 second)
//功能：设置RTC芯片PCF8563的时间
//输入：year month day hour min second:年月日时分秒
//输出：无
void PCF8563_set_time(u8 year,u8 month,u8 day,u8 hour,u8 min,u8 second)
{
PCF8563_Write_Byte(TIME_SECOND,second);
delay_us(20);
PCF8563_Write_Byte(TIME_MINUTE,min);
delay_us(20);
PCF8563_Write_Byte(TIME_HOUR,hour);
delay_us(20);
PCF8563_Write_Byte(TIME_DAY,day);
delay_us(20);
PCF8563_Write_Byte(TIME_MONTH,month);
delay_us(20);
PCF8563_Write_Byte(TIME_YEAR,year);
delay_us(20);
}
//函数名称：Datetime_Structure rtc_get_time(void)
//功能：读取RTC芯片PCF8563的时间
//输入：无
//输出：Datetime_Structure结构体变量
Datetime_Structure rtc_get_time(void)
{
u32 m_unTempTime;
Datetime_Structure getTime_Struct;
/*get time---second****************/
m_unTempTime = PCF8563_Read_Byte(TIME_SECOND)&0x7f;
m_unTempTime = (m_unTempTime/16)*10+m_unTempTime%16;
getTime_Struct.second = m_unTempTime;
/*get time---minute****************/
m_unTempTime = PCF8563_Read_Byte(TIME_MINUTE)&0x7f;
m_unTempTime = (m_unTempTime/16)*10+m_unTempTime%16;
getTime_Struct.min = m_unTempTime;
/*get time---hour****************/
m_unTempTime = PCF8563_Read_Byte(TIME_HOUR)&0x3f;
m_unTempTime = (m_unTempTime/16)*10+m_unTempTime%16;
getTime_Struct.hour = m_unTempTime;
/*get time---day****************/
m_unTempTime = PCF8563_Read_Byte(TIME_DAY)&0x3f;
m_unTempTime = (m_unTempTime/16)*10+m_unTempTime%16;
getTime_Struct.day = m_unTempTime;
/*get time---month****************/
m_unTempTime = PCF8563_Read_Byte(TIME_MONTH)&0x1f;
m_unTempTime = (m_unTempTime/16)*10+m_unTempTime%16;
getTime_Struct.month = m_unTempTime;
/*get time---year****************/
m_unTempTime = PCF8563_Read_Byte(TIME_YEAR)&0xff;
m_unTempTime = (m_unTempTime/16)*10+m_unTempTime%16;
getTime_Struct.year = m_unTempTime;
return getTime_Struct;
}

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库函数i2c_pcf8563.7z (182.19 KB, 下载次数: 18)

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STM32单片机pcf8563程序 库函数i2c

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STM32单片机pcf8563程序库函数i2c