IIC多字节读取

最新推荐文章于 2025-05-28 15:07:07 发布

竹林听雨silent

最新推荐文章于 2025-05-28 15:07:07 发布

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分类专栏：总线技术文章标签： C语言实现IIC多字

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本文详细介绍了I2C通信的基本原理及其在STM32平台上的实现方法。包括I2C的初始化配置、启动与停止信号的发送、数据的读写操作及应答机制等关键环节。

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写模式时序图

读模式时序图

#include "wx_i2c.h"


#define IIC_Write_Address 0xa0 //Write Address
#define IIC_Read_Address 0xa1 //Read Address


#define IIC_SDA_DAT   GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_11)

#define IIC_SDA_L   GPIO_ResetBits(GPIOB, GPIO_Pin_11)
#define IIC_SDA_H   GPIO_SetBits(GPIOB, GPIO_Pin_11)
#define IIC_SCL_L   GPIO_ResetBits(GPIOB, GPIO_Pin_10)
#define IIC_SCL_H   GPIO_SetBits(GPIOB, GPIO_Pin_10)



void delay_5us(u16 num)//满足IIC时序的延时
{
    u16 i,j;
    for(i=num;i>0;i--)
    {
        for(j=10;j>0;j--);
    }
}

void IIC_Init(void)//IIC初始化程序
{
IIC_SDA_H;
IIC_SCL_H;
delay_5us(1);
}

void IIC_Start(void)//IIC开始信号
{
IIC_SDA_H;
IIC_SCL_H;
delay_5us(1);
IIC_SDA_L;
delay_5us(1);
IIC_SCL_L;
}

void IIC_Stop(void)//IIC停止信号
{
IIC_SDA_L;
IIC_SCL_H;
delay_5us(1);
IIC_SDA_H;
}

void IIC_Wait_ack(void)//IIC主器件等待应答  ?????
{
u8 ErrTime=255;
IIC_SCL_H;
//while(IIC_SDA&&(ErrTime>0))
    while(IIC_SDA_DAT)
    {
        ErrTime--;
    }
delay_5us(1);
IIC_SCL_L;
}


void IIC_Send_ack(void)//IIC主器件发送应答
{
IIC_SDA_L;
delay_5us(1);
IIC_SCL_H;
delay_5us(1);
IIC_SCL_L;
}


void IIC_Send_noack(void)//IIC主器件发送非应答
{
IIC_SDA_H;
IIC_SCL_H;
delay_5us(1);
IIC_SCL_L;
}


void IIC_Writebyte(u8 Data)//IIC写一个字节
{
u8 i;
for(i=8;i>0;i--)
{
   IIC_SCL_L;
   if((Data&0x80)==0x80)
   {
    IIC_SDA_H;
   }
   else
   {
    IIC_SDA_L;
   }
   Data<<=1;
   delay_5us(1);
   IIC_SCL_H;
   delay_5us(1);
}
IIC_SCL_L;
IIC_SDA_H;
delay_5us(10);
}


u8 IIC_Readbyte(void)//IIC读一个字节
{
u8 i,Data=0;
IIC_SDA_H;
for(i=8;i>0;i--)
{
   Data<<=1;
   IIC_SCL_L;
   delay_5us(1);
   IIC_SCL_H;
   delay_5us(1);
//   Data|=GPIO_ReadInputDataBit(GPIOB, GPIO_Pin7) 
   Data|=IIC_SDA_DAT; //读管脚的状态
}
IIC_SCL_L;
delay_5us(1);
return(Data);
}


void IIC_Write(u16 Address,u8 Data)//IIC 往指定地址Address里写Data
{
u8 addr;
addr = Address&0xff;
IIC_Start();
IIC_Writebyte(IIC_Write_Address);
IIC_Wait_ack();
//IIC_Writebyte(page);
//IIC_Wait_ack();
IIC_Writebyte(addr);
IIC_Wait_ack();
IIC_Writebyte(Data);
IIC_Wait_ack();
IIC_Stop();
delay_5us(10000);
}


void IIC_Write_Array(u8 *Data,u16 Address,u16 Num)//IIC 往起始地址Address里写Data[]数组
{
u8 addr;

addr = Address&0xff;
IIC_Start();
IIC_Writebyte(IIC_Write_Address);
IIC_Wait_ack();
//IIC_Writebyte(page);
//IIC_Wait_ack();
IIC_Writebyte(addr);
IIC_Wait_ack();

for(;Num>0;Num--)
{
  IIC_Writebyte(*Data);
  IIC_Wait_ack();
  Data++;
}
IIC_Stop();
delay_5us(10000);

/*
u8 page1,page2,yushu;
u8 page,addr,addr1;
addr = Address&0xff;
page1 = Address>>5;
page2 =(Address+Num)>>5;
addr1 = (Address+Num)&0xff;
p=Data;
for(page=page1;page<=page2;page++)
{
if((page==page1)||(page==page2))
{
   if(page==page1)
    {
     if(page1==page2)
        {
                yushu= Num;
               }

    else
        {
        yushu=(32-addr&0x1f)%32;
        }
    }
   else 
    yushu=addr1%32;
}
else
{
    yushu=0;
}
IIC_Start();
IIC_Writebyte(IIC_Write_Address);
IIC_Wait_ack();
IIC_Writebyte(page>>3);
IIC_Wait_ack();
IIC_Writebyte(addr);
IIC_Wait_ack();
for(i=0;i<32;i++)
{
addr++;
IIC_Writebyte(*p);
IIC_Wait_ack();
p++;
if(yushu!=0)
{
    if(i==yushu-1)
    break;
}
}
IIC_Stop();
delay_5us(10000);
}  */
}


u8 IIC_Read(u16 Address)//IIC 读指定地址Address里的Data
{
u8 Data_R;
u8 addr;
addr = Address&0xff;
//page = (Address>>8)&0xf;
IIC_Start();
IIC_Writebyte(IIC_Write_Address);
IIC_Wait_ack();
IIC_Writebyte(addr);
IIC_Wait_ack();
IIC_Start();
IIC_Writebyte(IIC_Read_Address);
IIC_Wait_ack();
Data_R=IIC_Readbyte();
IIC_Send_noack();
IIC_Stop();
return(Data_R);
/*
IIC_Writebyte(page);
IIC_Wait_ack();
IIC_Writebyte(addr);
IIC_Wait_ack();
IIC_Start();
IIC_Writebyte(IIC_Read_Address);
IIC_Wait_ack();
Data_R=IIC_Readbyte();
IIC_Send_noack();
IIC_Stop();
return(Data_R);  
*/
}


void IIC_Read_Array(u8 *Data,u16 Address,u16 Num)//IIC 读起始地址Address里的Data[]
{
u16 i;
u8 *p;
u8 addr;
addr = Address&0xff;
p=Data;   
/*IIC_Start();
IIC_Writebyte(IIC_Write_Address);
IIC_Wait_ack();
IIC_Writebyte(page);
IIC_Wait_ack();
IIC_Writebyte(addr);
IIC_Wait_ack();
IIC_Start();
IIC_Writebyte(IIC_Read_Address);
IIC_Wait_ack();
*/
IIC_Start();
IIC_Writebyte(IIC_Write_Address);
IIC_Wait_ack();
IIC_Writebyte(addr);
IIC_Wait_ack();
IIC_Start();
IIC_Writebyte(IIC_Read_Address);
IIC_Wait_ack();
for(i=0;i<Num;i++)
{
*(p+i)=IIC_Readbyte();
if(i==Num-1)
    IIC_Send_noack();
else
    IIC_Send_ack();
}
IIC_Stop();
}


void IIC_Clear(u16 Address,u16 Num)
{
u8 i,j;
u8 page1,page2,yushu;
u8 page,addr,n,addr1;
addr = Address&0xff;
page1 = (Address>>8)&0xf;
page2 =((Address+Num)>>8)&0xf;
addr1 = (Address+Num)&0xff;
for(page=page1;page<=page2;page++)
{
if((page==page1)||(page==page2))
{
   if(page==page1)
    {
     if(page1==page2)
        {
        n=Num/32;
     yushu=Num%32;
        }
      else
        {
    n=(256-addr)/32;
     yushu=(256-addr)%32;
        }
     if(yushu)
        n+=1;
    }
    else
        {
        n=addr1/32;
        yushu=addr1%32;
        if(yushu)
            n+=1;
        }
}
else
{
    n=8;
    yushu=0;
}
for(j=0;j<n;j++)
{
IIC_Start();
IIC_Writebyte(IIC_Write_Address);
IIC_Wait_ack();
IIC_Writebyte(page);
IIC_Wait_ack();
IIC_Writebyte(addr+32*j);
IIC_Wait_ack();
for(i=0;i<32;i++)
{
IIC_Writebyte(0xff);
IIC_Wait_ack();
}
IIC_Stop();
delay_5us(10000);
}
}
}

/*******************************************************************************************************
                                 end  file!!!
********************************************************************************************************/