求MCS-51单片机模拟I2C接口软件设计?
答案:1 悬赏:10
解决时间 2021-10-15 22:48
- 提问者网友:佞臣
- 2021-10-15 16:21
求MCS-51单片机模拟I2C接口软件设计?
最佳答案
- 二级知识专家网友:天凉才是好个秋
- 2021-10-15 17:11
归一化模拟I2C总线软件包(C51)
#ifndef I2C_H
#define I2C_H
//定义I2C操作模式
#define I2C_RECV 0
#define I2C_SEND 1
#define I2C_SrRECV 2
//I2C总线初始化
void I2C_Init();
bit I2C_On
(
unsigned char Mode, //操作模式
unsigned char SLA, //从机地址
unsigned char Addr, //子地址
unsigned char *Buf, //数据缓冲区
unsigned char Size //数据长度
);
#endif //I2C_H
#i nclude <REG52.H>
#i nclude "I2C.H"
//模拟I2C总线的管脚定义
sbit I2C_SCL = P1^6; //定义I2C总线时钟信号
sbit I2C_SDA = P1^7; //定义I2C总线数据信号
void I2C_Delay()
{
unsigned char t;
t = 10;
while ( --t != 0 ); //延时2*t个机器周期
}
void I2C_Init()
{
I2C_SCL = 1; I2C_Delay();
I2C_SDA = 1; I2C_Delay();
}
void I2C_Start()
{
I2C_SDA = 1; I2C_Delay();
I2C_SCL = 1; I2C_Delay();
I2C_SDA = 0; I2C_Delay();
I2C_SCL = 0; I2C_Delay();
}
void I2C_Write(unsigned char dat)
{
unsigned char t = 8;
do
{
I2C_SDA = (bit)(dat & 0x80);
dat <<= 1;
I2C_SCL = 1; I2C_Delay();
I2C_SCL = 0; I2C_Delay();
} while ( --t != 0 );
}
unsigned char I2C_Read()
{
unsigned char dat;
unsigned char t = 8;
I2C_SDA = 1; //在读取数据之前,要把SDA拉高,使之处于输入状态
do
{
I2C_SCL = 1; I2C_Delay();
dat <<= 1;
if ( I2C_SDA ) dat++;
I2C_SCL = 0; I2C_Delay();
} while ( --t != 0 );
return dat;
}
bit I2C_GetAck()
{
bit Ack;
I2C_SDA = 1; I2C_Delay();
I2C_SCL = 1; I2C_Delay();
Ack = I2C_SDA;
I2C_SCL = 0; I2C_Delay();
return Ack;
}
void I2C_PutAck(bit Ack)
{
I2C_SDA = Ack; I2C_Delay();
I2C_SCL = 1; I2C_Delay();
I2C_SCL = 0; I2C_Delay();
}
void I2C_Stop()
{
I2C_SDA = 0; I2C_Delay();
I2C_SCL = 1; I2C_Delay();
I2C_SDA = 1; I2C_Delay();
}
bit I2C_On
(
unsigned char Mode, //操作模式
unsigned char SLA, //从机地址
unsigned char Addr, //子地址
unsigned char *Buf, //数据缓冲区
unsigned char Size //数据长度
)
{
//启动I2C总线
I2C_Start();
if ( Mode != I2C_RECV )
{
//发送SLA+W
I2C_Write(SLA & 0xFE);
if ( I2C_GetAck() )
{
I2C_Stop();
return 1;
}
//发送子地址
I2C_Write(Addr);
if ( I2C_GetAck() )
{
I2C_Stop();
return 1;
}
if ( Mode == I2C_SEND )
{
//发送数据
do
{
I2C_Write(*Buf++);
if ( I2C_GetAck() )
{
I2C_Stop();
return 1;
}
} while ( --Size != 0 );
//发送完毕
I2C_Stop();
return 0;
}
else
{
I2C_Start(); //发送重复起始条件
}
}
//发送SLA+R
I2C_Write(SLA | 0x01);
if ( I2C_GetAck() )
{
I2C_Stop();
return 1;
}
//接收数据
for (;;)
{
*Buf++ = I2C_Read();
if ( --Size == 0 )
{
I2C_PutAck(1); //接收完最后一个数据时发送NACK
break;
}
I2C_PutAck(0);
}
//接收完毕
I2C_Stop();
return 0;
}
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#ifndef I2C_H
#define I2C_H
//定义I2C操作模式
#define I2C_RECV 0
#define I2C_SEND 1
#define I2C_SrRECV 2
//I2C总线初始化
void I2C_Init();
bit I2C_On
(
unsigned char Mode, //操作模式
unsigned char SLA, //从机地址
unsigned char Addr, //子地址
unsigned char *Buf, //数据缓冲区
unsigned char Size //数据长度
);
#endif //I2C_H
#i nclude <REG52.H>
#i nclude "I2C.H"
//模拟I2C总线的管脚定义
sbit I2C_SCL = P1^6; //定义I2C总线时钟信号
sbit I2C_SDA = P1^7; //定义I2C总线数据信号
void I2C_Delay()
{
unsigned char t;
t = 10;
while ( --t != 0 ); //延时2*t个机器周期
}
void I2C_Init()
{
I2C_SCL = 1; I2C_Delay();
I2C_SDA = 1; I2C_Delay();
}
void I2C_Start()
{
I2C_SDA = 1; I2C_Delay();
I2C_SCL = 1; I2C_Delay();
I2C_SDA = 0; I2C_Delay();
I2C_SCL = 0; I2C_Delay();
}
void I2C_Write(unsigned char dat)
{
unsigned char t = 8;
do
{
I2C_SDA = (bit)(dat & 0x80);
dat <<= 1;
I2C_SCL = 1; I2C_Delay();
I2C_SCL = 0; I2C_Delay();
} while ( --t != 0 );
}
unsigned char I2C_Read()
{
unsigned char dat;
unsigned char t = 8;
I2C_SDA = 1; //在读取数据之前,要把SDA拉高,使之处于输入状态
do
{
I2C_SCL = 1; I2C_Delay();
dat <<= 1;
if ( I2C_SDA ) dat++;
I2C_SCL = 0; I2C_Delay();
} while ( --t != 0 );
return dat;
}
bit I2C_GetAck()
{
bit Ack;
I2C_SDA = 1; I2C_Delay();
I2C_SCL = 1; I2C_Delay();
Ack = I2C_SDA;
I2C_SCL = 0; I2C_Delay();
return Ack;
}
void I2C_PutAck(bit Ack)
{
I2C_SDA = Ack; I2C_Delay();
I2C_SCL = 1; I2C_Delay();
I2C_SCL = 0; I2C_Delay();
}
void I2C_Stop()
{
I2C_SDA = 0; I2C_Delay();
I2C_SCL = 1; I2C_Delay();
I2C_SDA = 1; I2C_Delay();
}
bit I2C_On
(
unsigned char Mode, //操作模式
unsigned char SLA, //从机地址
unsigned char Addr, //子地址
unsigned char *Buf, //数据缓冲区
unsigned char Size //数据长度
)
{
//启动I2C总线
I2C_Start();
if ( Mode != I2C_RECV )
{
//发送SLA+W
I2C_Write(SLA & 0xFE);
if ( I2C_GetAck() )
{
I2C_Stop();
return 1;
}
//发送子地址
I2C_Write(Addr);
if ( I2C_GetAck() )
{
I2C_Stop();
return 1;
}
if ( Mode == I2C_SEND )
{
//发送数据
do
{
I2C_Write(*Buf++);
if ( I2C_GetAck() )
{
I2C_Stop();
return 1;
}
} while ( --Size != 0 );
//发送完毕
I2C_Stop();
return 0;
}
else
{
I2C_Start(); //发送重复起始条件
}
}
//发送SLA+R
I2C_Write(SLA | 0x01);
if ( I2C_GetAck() )
{
I2C_Stop();
return 1;
}
//接收数据
for (;;)
{
*Buf++ = I2C_Read();
if ( --Size == 0 )
{
I2C_PutAck(1); //接收完最后一个数据时发送NACK
break;
}
I2C_PutAck(0);
}
//接收完毕
I2C_Stop();
return 0;
}
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