模拟IIC

只看该作者 · 2020-9-9 10:43

本帖最后由邪乎风云于 2020-9-9 12:23 编辑

为了后面使用模拟的IIC，特地封装了一下，仅供参考
代码里边的标记单词f l g被和谐了，这是什么情况

只看该作者 · 2020-9-9 10:44

头文件 V_IIC.h

#ifndef __V_IIC_H
#define __V_IIC_H
typedef struct{
unsigned char  (*SDA_Read)(void);
void (*SDA_Out)(unsigned char state);
void (*SCL_Out)(unsigned char state);
void (*SDA_DirSet)(unsigned char out);
}V_IIC_MasterHandle;
#define USE_OS 1 //是否使用操作系统
#if USE_OS
#include "ucos_ii.h"
#include "os_cpu.h"
#include "os_cfg.h"
#define OS_IIC_Dealyms(t)  OSTimeDlyHMSM(0,t/1000/60,t/1000%60,t%1000); //操作系统延时函数
extern unsigned char ucos_start_**;
#define os_start_** ucos_start_** //操作系统启动标志
#define os_protect_start_no_change OSSchedLock //关闭调度
#define os_protect_end_no_change OSSchedUnlock //重启调度
#endif
typedef unsigned char AdrType;//寄存器数据类型一个字节或多个字节
/*******
master IIC的句柄
SDA_Read SDA数据引脚作为输入状态读取引脚电平的函数指针，返回1表示高电平
SDA_Out  SDA数据引脚作为输出状态输出引脚电平的函数指针，state为1表示输出高电平
SCL_Out  SCL时钟引脚作为输出状态输出引脚电平的函数指针，state为1表示输出高电平
SDA_DirSet SDA数据引脚输入输出状态的切换的函数指针，out为1表示SDA数据引脚设为输出状态
******/
void V_Master_IIC_Init(V_IIC_MasterHandle *master,unsigned char  (*SDA_Read)(void),void (*SDA_Out)(unsigned char state),void (*SCL_Out)(unsigned char state),void (*SDA_DirSet)(unsigned char out));
/****************
master IIC的句柄
slave_adr 从机地址7bit的
adr 寄存器起始地址
redata 读取的数据内容，指针是输出用的
len 读取数据长度

返回 4 成功
*****************/
unsigned char  V_Master_IIC_Read(V_IIC_MasterHandle *master,unsigned char slave_adr,AdrType adr,char *redata,unsigned short len);

/****************
master IIC的句柄
slave_adr 从机地址7bit的
adr 寄存器起始地址
data 写入数据的数据内容，指针是输入使用
len 写入数据长度

返回 4 成功
*****************/
unsigned char  V_Master_IIC_Write(V_IIC_MasterHandle *master,unsigned char slave_adr,AdrType adr,char *data,unsigned short len);

void IIC_delay_us(unsigned int t);//根据需要修改，可重新定义，此处非操作系统的延时

#endif

只看该作者 · 2020-9-9 10:45

本帖最后由邪乎风云于 2020-9-9 10:57 编辑

c文件
#include "V_IIC.h"
//#include "stdio.h"

__attribute__((weak)) void IIC_delay_us(unsigned int t)
{
  unsigned int i =0;
      for(i=0;i<t;i++){
      }
}

void V_Master_IIC_Init(V_IIC_MasterHandle *master,unsigned char (*SDA_Read)(void),void (*SDA_Out)(unsigned char state),void (*SCL_Out)(unsigned char state),void (*SDA_DirSet)(unsigned char out))
{
      master->SCL_Out = SCL_Out;
      master->SDA_Out = SDA_Out;
      master->SDA_Read = SDA_Read;
      master->SDA_DirSet = SDA_DirSet;
}

void V_Master_IIC_Start(V_IIC_MasterHandle *master)
{
      master->SDA_DirSet(1);
      master->SDA_Out(1);
      master->SCL_Out(1);
      IIC_delay_us(4);
      master->SDA_Out(0);
      IIC_delay_us(4);
      master->SCL_Out(0);
}

void V_Master_IIC_Stop(V_IIC_MasterHandle *master)
{
      master->SDA_DirSet(1);
      master->SCL_Out(0);
      master->SDA_Out(0);
      IIC_delay_us(4);
      master->SCL_Out(1);
      IIC_delay_us(2);
      master->SDA_Out(1);
      IIC_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
unsigned char V_Master_IIC_Wait_Ack(V_IIC_MasterHandle *master)
{
      unsigned char ucErrTime=0;
      master->SDA_DirSet(0);
      master->SDA_Out(1);
      IIC_delay_us(1);
      master->SCL_Out(1);
      IIC_delay_us(1);
      while(master->SDA_Read())
      {
            ucErrTime++;
            if(ucErrTime>250)
            {
                     V_Master_IIC_Stop(master);
                     return 1;
            }
      }
      master->SCL_Out(0);
      return 0;
}

void  V_Master_IIC_Ack(V_IIC_MasterHandle *master)
{
      master->SCL_Out(0);
      master->SDA_DirSet(1);
      master->SDA_Out(0);
      IIC_delay_us(2);
      master->SCL_Out(1);
      IIC_delay_us(2);
      master->SCL_Out(0);
}
//不产生ACK应答
void V_Master_IIC_NAck(V_IIC_MasterHandle *master)
{
      master->SCL_Out(0);
      master->SDA_DirSet(1);
      master->SDA_Out(1);
      IIC_delay_us(2);
      master->SCL_Out(1);
      IIC_delay_us(2);
      master->SCL_Out(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 V_Master_IIC_Send_Byte(V_IIC_MasterHandle *master,unsigned char txd)
{
unsigned char t;
master->SCL_Out(0);
            master->SDA_DirSet(1);
for(t=0;t<8;t++)
{
      master->SDA_Out((txd&0x80)>>7);
      txd<<=1;
                              IIC_delay_us(2); //对TEA5767这三个延时都是必须的
                              master->SCL_Out(1);
                              IIC_delay_us(2);
                              master->SCL_Out(0);
                              IIC_delay_us(2);
}
}
//读1个字节，ack=1时，发送ACK，ack=0，发送nACK
unsigned char V_Master_IIC_Read_Byte(V_IIC_MasterHandle *master,unsigned char ack)
{
      unsigned char i,receive=0;
      master->SDA_DirSet(0);
  for(i=0;i<8;i++ )
      {
      master->SCL_Out(0);
      IIC_delay_us(2);
                              master->SCL_Out(1);
      receive<<=1;
      if(master->SDA_Read())receive++;
                              IIC_delay_us(1);
  }
      if (!ack)
                     V_Master_IIC_NAck(master);//发送nACK
      else
                     V_Master_IIC_Ack(master); //发送ACK
      return receive;
}

unsigned char  V_Master_IIC_Read(V_IIC_MasterHandle *master,unsigned char slave_adr,AdrType adr,char *redata,unsigned short len)
{
      unsigned short i =0;
      unsigned char result = 0;
#if USE_OS
      if(os_start_**){
            os_protect_start_no_change();
      }
#endif
      V_Master_IIC_Stop(master);
      V_Master_IIC_Start(master);
      V_Master_IIC_Send_Byte(master,slave_adr<<1);
      if(V_Master_IIC_Wait_Ack(master)){
            result= 1;
            goto IIC_Read_End;
      }
      for(i=0;i<sizeof(AdrType);i++){
            V_Master_IIC_Send_Byte(master,adr>>((sizeof(AdrType)-i-1)*8));
            if(V_Master_IIC_Wait_Ack(master)){
                     result= 2;
                     goto IIC_Read_End;
            }
      }
      V_Master_IIC_Start(master);
      V_Master_IIC_Send_Byte(master,(slave_adr<<1) +1);
      if(V_Master_IIC_Wait_Ack(master)){
            result = 3;
            goto IIC_Read_End;
      }
      for(i=0;i<len;i++){
            if( i ==(len -1)){
                     *redata++=V_Master_IIC_Read_Byte(master,0);
            }else{
                     *redata++=V_Master_IIC_Read_Byte(master,1);
            }
      }
      V_Master_IIC_Stop(master);
      result=4;
      goto IIC_Read_End;
      IIC_Read_End:
#if USE_OS
      if(os_start_**){
            os_protect_end_no_change();
      }
#endif
      return result;
}
unsigned char V_Master_IIC_Write(V_IIC_MasterHandle *master,unsigned char slave_adr,AdrType adr,char *data,unsigned short len)
{
      unsigned short i =0;
      unsigned char result = 0;
#if USE_OS
      if(os_start_**){
            os_protect_start_no_change();
      }
#endif
      V_Master_IIC_Stop(master);
      V_Master_IIC_Start(master);
      V_Master_IIC_Send_Byte(master,slave_adr<<1);
      if(V_Master_IIC_Wait_Ack(master)){
            result= 1;
            goto IIC_Write_End;
      }
      for(i=0;i<sizeof(AdrType);i++){

            V_Master_IIC_Send_Byte(master,adr>>((sizeof(AdrType)-i-1)*8));
            if(V_Master_IIC_Wait_Ack(master)){
                     result = 2;
                     goto IIC_Write_End;
            }
      }
      for(i=0;i<len;i++){
            V_Master_IIC_Send_Byte(master,*data++);
            if(V_Master_IIC_Wait_Ack(master)){
                     result= 3;
                     goto IIC_Write_End;
            }
      }
      V_Master_IIC_Stop(master);

      result= 4;
      goto IIC_Write_End;
IIC_Write_End:
#if USE_OS
      if(os_start_**){
            os_protect_end_no_change();
            OS_IIC_Dealyms(10*len);
      }else{
            IIC_delay_us(10000*len);
      }
#else
      IIC_delay_us(10000*len);
#endif
      return result;
}

只看该作者 · 2020-9-9 10:59

源代码附件

只看该作者 · 2020-9-9 20:33

粘贴到代码专用框里就OK了。