INA226使用教程（IIC）

INA226是一路电压电流功率检测器，可以检测线电压，分流电阻的电压和分流电阻电流。

具体实现要看INA226数据手册。

INA226.c:

#include "INA226.h"


INA226 INA226_data;

static void delay_nns(uint16_t D)  //30纳秒ns  根据手册要用到IIC的HS高速模式
{
    while(--D);
}

void delay_nms(uint16_t ms)  //毫秒
{
    uint16_t i;
    uint32_t M = 0;//720W
    for(i = 0;i < ms; i++)
    for(M=12000;M > 0;M--);
}

void delay_nus(uint16_t us)//微秒
{
    uint16_t i;
    uint16_t M = 0;//720W
    for(i = 0;i < us; i++)
    for(M=72;M > 0;M--);
}

/****************IIC***************************/
void INA226_IIC_Init(void)
{
    GPIO_InitTypeDef GPIO_Initure;
    __HAL_RCC_GPIOB_CLK_ENABLE();   //使能GPIOB时钟
    
     //PC11,12初始化设置
    GPIO_Initure.Pin=GPIO_PIN_10|GPIO_PIN_11;//PB10SCL PB11SDA
    GPIO_Initure.Mode=GPIO_MODE_OUTPUT_PP;  //推挽输出
    GPIO_Initure.Pull=GPIO_PULLUP;          //上拉
    GPIO_Initure.Speed=GPIO_SPEED_FREQ_HIGH;     //高速
    HAL_GPIO_Init(GPIOB,&GPIO_Initure);
    
    IIC_SDA_H;
    IIC_SCL_H;  
        delay_nms(5);
}
    
void INA226_IIC_Start(void)
{
    IIC_SDA_H;            
    IIC_SCL_H;
    delay_nns(5);
     IIC_SDA_L;//START:when CLK is high,DATA change form high to low 
    delay_nns(5);
    IIC_SCL_L;//钳住I2C总线，准备发送或接收数据 
    delay_nns(5);
}    

void INA226_IIC_Stop(void)
{
    IIC_SDA_L;//STOP:when CLK is high DATA change form low to high
     delay_nns(5);
    IIC_SCL_H; 
        delay_nns(5);
    IIC_SDA_H;//发送I2C总线结束信号
    delay_nns(5);                                   
}

void INA226_IIC_Ack(void)
{
    IIC_SDA_L;
    delay_nns(5);
    IIC_SCL_H;
    delay_nns(5);
    IIC_SCL_L;
        delay_nns(5);
    IIC_SDA_H;
}

void INA226_IIC_NAck(void)
{
    IIC_SDA_H;
    delay_nns(5);
    IIC_SCL_H;
delay_nns(5);
    IIC_SCL_L;
    delay_nns(5);
    IIC_SDA_L;
}        

uint8_t INA226_IIC_Wait_Ack(void)
{
    uint8_t ucErrTime=0;
    //SDA_IN();      //SDA设置为输入  
    IIC_SDA_H;
    delay_nns(5);       
    IIC_SCL_H;
    delay_nns(5);          
    
    while(READ_SDA)
    {
        ucErrTime++;
        if(ucErrTime>250)
        {
            INA226_IIC_Stop();
            return 1;
        }
    }
    IIC_SCL_L;//时钟输出0        
    return 0;  
}

void INA226_IIC_Send_Byte(uint8_t txd)
{                              
   IIC_SCL_L;//拉低时钟开始数据传输
   for(uint8_t i = 0;i < 8;i++)
    {              
        if(txd&0x80)
                    IIC_SDA_H;
                else
                    IIC_SDA_L;                
        txd<<=1;       
                
        IIC_SCL_H;
        delay_nns(5);
        IIC_SCL_L;
        delay_nns(5);
    }            
    //    IIC_SDA_H;
    //    IIC_SCL_H;            //当去掉wait_ack时的时候添加
    //    delay_nns(5);
        //IIC_SCL_L;
} 

uint8_t INA226_IIC_Read_Byte(unsigned char ack)
{
      uint8_t TData=0,i;
    for(i=0;i<8;i++)
    {
        IIC_SCL_H;
        delay_nns(5);
        TData=TData<<1;
        //if(GPIOB->IDR& GPIO_IDR_IDR7)        //判断SDA是否为高
            if(SDA_READ)
        {
            TData|=0x01;
        }
        IIC_SCL_L;
        delay_nns(5);
    }
        if(!ack)
            INA226_IIC_NAck();
        else
            INA226_IIC_Ack();
//    IIC_SCL_L;
//    delay_nns(5);
//    IIC_SDA_L;
//    delay_nns(5);                //ACK
//    IIC_SCL_H;
//    delay_nns(5);
//    IIC_SCL_L;
//    delay_nns(5);
//    IIC_SDA_H;
    return TData;
}

/**********************IIC_END*************************/

void INA226_Init(void)
{
    INA226_IIC_Init();
    HAL_Delay(10);
    //    INA226_SendData(INA226_ADDR1,CFG_REG,0xC000);

//    HAL_Delay(10);
    //uint16_t cfg_reg_value = 0x4000|(3<<9)|(4<<6)|(4<<3)|7;
//    INA226_SendData(INA226_ADDR1,CFG_REG,0x484f);
//    INA226_SendData(INA226_ADDR1,CAL_REG,0x0012);
    INA226_SendData(INA226_ADDR1,0x00,0x4727);
    INA226_SendData(INA226_ADDR1,0x05,0x800);//A00
}

void INA226_SendData(uint8_t addr,uint8_t reg,uint16_t data)
{
    uint8_t temp = 0;
    INA226_IIC_Start();
    INA226_IIC_Send_Byte(addr);
    INA226_IIC_Wait_Ack();
 
    INA226_IIC_Send_Byte(reg);
    INA226_IIC_Wait_Ack();
    
    temp = (uint8_t)(data>>8);
    INA226_IIC_Send_Byte(temp);
    INA226_IIC_Wait_Ack();
 
    temp = (uint8_t)(data&0x00FF);
    INA226_IIC_Send_Byte(temp);
    INA226_IIC_Wait_Ack();
    
    INA226_IIC_Stop();
}


void INA226_SetRegPointer(uint8_t addr,uint8_t reg)
{
    INA226_IIC_Start();
 
    INA226_IIC_Send_Byte(addr);
    INA226_IIC_Wait_Ack();
 
    INA226_IIC_Send_Byte(reg);
    INA226_IIC_Wait_Ack();
 
    INA226_IIC_Stop();
}


uint16_t INA226_ReadData(uint8_t addr)
{
    uint16_t temp=0;
    INA226_IIC_Start();
 
    INA226_IIC_Send_Byte(addr+1);
    INA226_IIC_Wait_Ack();
    
    temp = INA226_IIC_Read_Byte(1);
    temp<<=8;    
    temp |= INA226_IIC_Read_Byte(0);
    
    INA226_IIC_Stop();
    return temp;
}


long INA226_GetShunt_Current(uint8_t addr)
{
    long temp=0;    
    INA226_SetRegPointer(addr,CUR_REG);
    temp = INA226_ReadData(addr);
    if(temp&0x8000)    
    {
        temp = ~(temp - 1);    
            temp = (uint16_t)temp - 2 * (uint16_t)temp;
    }
        return temp;
}
 
//获取 id
uint16_t  INA226_Get_ID(uint8_t addr)
{
    uint32_t temp=0;
    INA226_SetRegPointer(addr,INA226_GET_ADDR);
    temp = INA226_ReadData(addr);
    return (uint16_t)temp;
}
 
//获取校准值
uint16_t INA226_GET_CAL_REG(uint8_t addr)
{    
    uint32_t temp=0;
    INA226_SetRegPointer(addr,CAL_REG);
    temp = INA226_ReadData(addr);
    return (uint16_t)temp;
}
 
//1.25mV/bit
uint32_t INA226_GetVoltage(uint8_t addr)
{
    uint32_t temp=0;
    INA226_SetRegPointer(addr,BV_REG);
    temp = INA226_ReadData(addr);
    return (uint32_t)temp;    
}
 
 
 
//2.5uV/bit,感觉这个值是测不准的，所以下面改成2.2了
uint32_t INA226_GetShuntVoltage(uint8_t addr)
{
    uint32_t temp=0;
    INA226_SetRegPointer(addr,SV_REG);
    temp = INA226_ReadData(addr);
    if(temp&0x8000)    temp = ~(temp - 1);    
    return (uint32_t)temp;    
}
 
 
uint16_t INA226_Get_Power(uint8_t addr)
{
    int16_t temp=0;
    INA226_SetRegPointer(addr,PWR_REG);
    temp = INA226_ReadData(addr);
    return (uint16_t)temp;
}
 
 
void GetVoltage(float *Voltage)//mV
{
    Voltage[0] = INA226_GetVoltage(INA226_ADDR1)*1.25f;
    printf("ina226 v = %.2f
", Voltage[0]);
}
 
 
void Get_Shunt_voltage(float *Voltage)//uV
{
    Voltage[0] = (INA226_GetShuntVoltage(INA226_ADDR1)*2.2);//这里原来乘的系数是2.5
    
}
 
 
void Get_Shunt_Current(float *Current)//mA
{
    Current[0] = (INA226_GetShunt_Current(INA226_ADDR1)* 2.5f);
}
 
 
void GetPower()//W
{
    GetVoltage(&INA226_data.voltageVal);            //mV
    Get_Shunt_voltage(&INA226_data.Shunt_voltage);    //uV
    Get_Shunt_Current(&INA226_data.Shunt_Current);    //mA
    INA226_data.powerVal=INA226_data.voltageVal*0.001f * INA226_data.Shunt_Current*0.001f;
}
uint16_t read_dat;
float read_vol;
float GetV(void)
{
    //电压采样
    INA226_IIC_Start();
    INA226_IIC_Send_Byte(0x80);
    INA226_IIC_Wait_Ack();
  INA226_IIC_Send_Byte(0x00);
  INA226_IIC_Wait_Ack();
     INA226_IIC_Send_Byte(0x47);
  INA226_IIC_Wait_Ack();
     INA226_IIC_Send_Byte(0x27);
  INA226_IIC_Wait_Ack();
  INA226_IIC_Stop();
    HAL_Delay(1);    
        
  INA226_IIC_Start();
    INA226_IIC_Send_Byte(0x81);
    INA226_IIC_Wait_Ack();
    read_dat = INA226_IIC_Read_Byte(1)<<8;
    //IIC_Wait_Ack();
    read_dat = read_dat + INA226_IIC_Read_Byte(0);
    read_vol = 0.00125*read_dat;    
    INA226_IIC_Stop();
    return read_vol;
}

INA226.h:

#ifndef _INA226_H
#define _INA226_H


#include "main.h"


#define     CFG_REG             0x00        //
#define     SV_REG             0x01        //分流电压， 此处分流电阻为 0.1欧
#define     BV_REG             0x02        //总线电压
#define     PWR_REG         0x03        //电源功率
#define     CUR_REG         0x04        //电流
#define     CAL_REG         0x05        //校准，设定满量程范围以及电流和功率测数的 
//#define     ONFF_REG         0x06        //屏蔽 使能 警报配置和转换准备就绪
//#define     AL_REG             0x07        //包含与所选警报功能相比较的限定值
#define     INA226_GET_ADDR 0XFF        //包含唯一的芯片标识号
#define       INA226_ADDR1    0x80



//IO操作
#define IIC_SCL_H   HAL_GPIO_WritePin(GPIOB,GPIO_PIN_10,GPIO_PIN_SET) //SCL H
#define IIC_SCL_L   HAL_GPIO_WritePin(GPIOB,GPIO_PIN_10,GPIO_PIN_RESET) //SCL H
#define IIC_SDA_H    HAL_GPIO_WritePin(GPIOB,GPIO_PIN_11,GPIO_PIN_SET) //SDA_H
#define IIC_SDA_L      HAL_GPIO_WritePin(GPIOB,GPIO_PIN_11,GPIO_PIN_RESET) //SDA_L
#define READ_SDA      HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_11)  //输入SDA
#define SDA_READ   GPIOB->IDR& GPIO_IDR_IDR11


typedef struct
{
    float voltageVal;            //mV
    float Shunt_voltage;        //uV
    float Shunt_Current;        //mA
    float powerVal;
}INA226;

static void delay_nns(uint16_t D);
void delay_nms(uint16_t ms);
void delay_nus(uint16_t us);
void INA226_IIC_Init(void);
void INA226_IIC_Start(void);
void INA226_IIC_Stop(void);
void INA226_IIC_Ack(void);
void INA226_IIC_NAck(void);
uint8_t INA226_IIC_Wait_Ack(void);
void INA226_IIC_Send_Byte(uint8_t txd);
uint8_t INA226_IIC_Read_Byte(unsigned char ack);
void INA226_Init(void);
void INA226_SendData(uint8_t addr,uint8_t reg,uint16_t data);
void INA226_SetRegPointer(uint8_t addr,uint8_t reg);
uint16_t INA226_ReadData(uint8_t addr);
long INA226_GetShunt_Current(uint8_t addr);
uint16_t  INA226_Get_ID(uint8_t addr);
uint16_t INA226_GET_CAL_REG(uint8_t addr);
uint32_t INA226_GetVoltage(uint8_t addr);
uint32_t INA226_GetShuntVoltage(uint8_t addr);
uint16_t INA226_Get_Power(uint8_t addr);
void GetVoltage(float *Voltage);
void Get_Shunt_voltage(float *Voltage);
void Get_Shunt_Current(float *Current);
void GetPower();
extern INA226 INA226_data;
float GetV(void);
#endif

IIC协议参考之前那份。

由于这个电路参考电压是负值，所以在计算电压时需要减去这个负值，所以以后用的时候最好是接地。

参考电路接法：