INA3221的使用教程（IIC）

INA3221使用方法和INA226基本上一致，多了选择多通道读取，根据数据手册制定不一样的初始化代码。

INA3221不能够直接读分流电阻的电流，但可以通过算得两端电压算出电流。

上代码：

INA3221.c:

#include "INA3221.h"

static void delay_nns_3221(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_3221(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_3221(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 INA3221_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_6|GPIO_PIN_7;//PB6SCL PB7SDA
    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_3221;
    IIC_SCL_H_3221;  
        delay_nms_3221(5);
}
    
void INA3221_IIC_Start(void)
{
    IIC_SDA_H_3221;            
    IIC_SCL_H_3221;
    delay_nns_3221(5);
     IIC_SDA_L_3221;//START:when CLK is high,DATA change form high to low 
    delay_nns_3221(5);
    IIC_SCL_L_3221;//钳住I2C总线，准备发送或接收数据 
    delay_nns_3221(5);
}    

void INA3221_IIC_Stop(void)
{
    IIC_SDA_L_3221;//STOP:when CLK is high DATA change form low to high
     delay_nns_3221(5);
    IIC_SCL_H_3221; 
        delay_nns_3221(5);
    IIC_SDA_H_3221;//发送I2C总线结束信号
    delay_nns_3221(5);                                   
}

void INA3221_IIC_Ack(void)
{
    IIC_SDA_L_3221;
    delay_nns_3221(5);
    IIC_SCL_H_3221;
    delay_nns_3221(5);
    IIC_SCL_L_3221;
        delay_nns_3221(5);
    IIC_SDA_H_3221;
}

void INA3221_IIC_NAck(void)
{
    IIC_SDA_H_3221;
    delay_nns_3221(5);
    IIC_SCL_H_3221;
delay_nns_3221(5);
    IIC_SCL_L_3221;
    delay_nns_3221(5);
    IIC_SDA_L_3221;
}        

uint8_t INA3221_IIC_Wait_Ack(void)
{
    uint8_t ucErrTime=0;
    //SDA_IN();      //SDA设置为输入  
    IIC_SDA_H_3221;
    delay_nns_3221(5);       
    IIC_SCL_H_3221;
    delay_nns_3221(5);          
    
    while(READ_SDA_3221)
    {
        ucErrTime++;
        if(ucErrTime>250)
        {
            INA3221_IIC_Stop();
            return 1;
        }
    }
    IIC_SCL_L_3221;//时钟输出0        
    return 0;  
}

void INA3221_IIC_Send_Byte(uint8_t txd)
{                              
   IIC_SCL_L_3221;//拉低时钟开始数据传输
   for(uint8_t i = 0;i < 8;i++)
    {              
        if(txd&0x80)
                    IIC_SDA_H_3221;
                else
                    IIC_SDA_L_3221;                
        txd<<=1;       
                
        IIC_SCL_H_3221;
        delay_nns_3221(5);
        IIC_SCL_L_3221;
        delay_nns_3221(5);
    }            
    //    IIC_SDA_H_3221;
    //    IIC_SCL_H_3221;            //当去掉wait_ack时的时候添加
    //    delay_nns_3221(5);
        //IIC_SCL_L_3221;
} 

uint8_t INA3221_IIC_Read_Byte(unsigned char ack)
{
      uint8_t TData=0,i;
    for(i=0;i<8;i++)
    {
        IIC_SCL_H_3221;
        delay_nns_3221(5);
        TData=TData<<1;
        //if(GPIOB->IDR& GPIO_IDR_IDR7)        //判断SDA是否为高
            if(SDA_READ_3221)
        {
            TData|=0x01;
        }
        IIC_SCL_L_3221;
        delay_nns_3221(5);
    }
        if(!ack)
            INA3221_IIC_NAck();
        else
            INA3221_IIC_Ack();
//    IIC_SCL_L_3221;
//    delay_nns_3221(5);
//    IIC_SDA_L_3221;
//    delay_nns_3221(5);                //ACK
//    IIC_SCL_H_3221;
//    delay_nns_3221(5);
//    IIC_SCL_L_3221;
//    delay_nns_3221(5);
//    IIC_SDA_H_3221;
    return TData;
}

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

void INA3221_Init(void)
{
    INA3221_IIC_Init();
    //HAL_Delay(10);

    INA3221_SendData(0x82 ,CFG_REG_3221,0x8000);//软件复位
    INA3221_SendData(0x84 ,CFG_REG_3221,0x8000);
    HAL_Delay(10);
    INA3221_SendData(0x82 ,CFG_REG_3221,0x7127);//7127
    INA3221_SendData(0x84 ,CFG_REG_3221,0x7127);
//    HAL_Delay(2);
//    INA3221_SendData(0x82, 0x01, 0x00);
//    INA3221_SendData(0x82, 0x03, 0x00);
//    INA3221_SendData(0x82, 0x05, 0x00);
//    INA3221_SendData(0x84, 0x01, 0x00);
//    INA3221_SendData(0x84, 0x03, 0x00);
//    INA3221_SendData(0x84, 0x05, 0x00);
//
    }

void INA3221_SendData(uint8_t addr,uint8_t reg,uint16_t data)
{
    uint8_t temp = 0;
    INA3221_IIC_Start();
    INA3221_IIC_Send_Byte(addr);
    INA3221_IIC_Wait_Ack();
 
    INA3221_IIC_Send_Byte(reg);
    INA3221_IIC_Wait_Ack();
    
    temp = (uint8_t)(data>>8);
    INA3221_IIC_Send_Byte(temp);
    INA3221_IIC_Wait_Ack();
 
    temp = (uint8_t)(data&0x00FF);
    INA3221_IIC_Send_Byte(temp);
    INA3221_IIC_Wait_Ack();
    
    INA3221_IIC_Stop();
}

void INA3221_SetRegPointer(uint8_t addr,uint8_t reg)
{
    INA3221_IIC_Start();
 
    INA3221_IIC_Send_Byte(addr);
    INA3221_IIC_Wait_Ack();
 
    INA3221_IIC_Send_Byte(reg);
    INA3221_IIC_Wait_Ack();
 
    INA3221_IIC_Stop();
}

uint16_t INA3221_ReadData(uint8_t addr)
{
    uint16_t temp=0;
    INA3221_IIC_Start();
 
    INA3221_IIC_Send_Byte(addr+1);
    INA3221_IIC_Wait_Ack();
    
    temp = INA3221_IIC_Read_Byte(1);
    temp<<=8;    
    temp |= INA3221_IIC_Read_Byte(0);
    
    INA3221_IIC_Stop();
    return temp;
}

uint16_t INA3221_GetVoltage(uint8_t addr,uint8_t channel)
{
    uint32_t temp=0;
    switch(channel)
    {
        case 1:INA3221_SetRegPointer(addr,0x02);break;
        case 2:INA3221_SetRegPointer(addr,0x04);break;
        case 3:INA3221_SetRegPointer(addr,0x06);break;
        default:break;
    }
    temp = INA3221_ReadData(addr);//printf("
 temp = %d",temp);
    if(temp&0x8000)    temp = ~(temp - 1);    
    return (uint16_t)temp;
//    return (u16)temp;    
}

//40uV/bit
uint16_t INA3221_GetShuntVoltage(uint8_t addr,uint8_t channel)
{
    uint32_t temp=0;
    switch(channel)
    {
        case 1:INA3221_SetRegPointer(addr,0x01);break;
        case 2:INA3221_SetRegPointer(addr,0x03);break;
        case 3:INA3221_SetRegPointer(addr,0x05);break;
        default:break;
    }
    temp = INA3221_ReadData(addr);
    if(temp&0x8000)    temp = ~(temp - 1);    
    return (uint16_t)temp;    
}

//1mA/bit
//long INA226_GetShunt_Current(u8 addr)
//{
//    long temp=0;
//    INA226_SetRegPointer(addr,CUR_REG);
//    temp = INA226_ReadData(addr);
//    if(temp&0x8000)
//    {
//        temp = ~(temp - 1);
//        temp = (u16)temp - 2 * (u16)temp;
//    }
//    return temp;
//}

INA3221.h:

#ifndef __INA3221_H
#define __INA3221_H
 #include "main.h"


#define     CFG_REG_3221             0x00        //
#define     SV_REG_3221             0x01        //分流电压， 此处分流电阻为 0.1欧
#define     BV_REG_3221             0x02        //总线电压
#define     PWR_REG_3221         0x03        //电源功率
#define     CUR_REG_3221        0x04        //电流
#define     CAL_REG_3221         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     INA3221_GET_ADDR 0XFF        //包含唯一的芯片标识号
#define       INA3221_ADDR1    0x80


//IO操作
#define IIC_SCL_H_3221   HAL_GPIO_WritePin(GPIOB,GPIO_PIN_6,GPIO_PIN_SET) //SCL H
#define IIC_SCL_L_3221   HAL_GPIO_WritePin(GPIOB,GPIO_PIN_6,GPIO_PIN_RESET) //SCL H
#define IIC_SDA_H_3221   HAL_GPIO_WritePin(GPIOB,GPIO_PIN_7,GPIO_PIN_SET) //SDA_H
#define IIC_SDA_L_3221  HAL_GPIO_WritePin(GPIOB,GPIO_PIN_7,GPIO_PIN_RESET) //SDA_L
#define READ_SDA_3221     HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_7)  //输入SDA
#define SDA_READ_3221  GPIOB->IDR& GPIO_IDR_IDR7 
 

static void delay_nns_3221(uint16_t D);
void delay_nms_3221(uint16_t ms) ;
    void delay_nus_3221(uint16_t us);
        void INA3221_IIC_Init(void);
            void INA3221_IIC_Start(void);
    void INA3221_IIC_Stop(void);
void INA3221_IIC_Ack(void);
void INA3221_IIC_NAck(void);
uint8_t INA3221_IIC_Wait_Ack(void);
void INA3221_IIC_Send_Byte(uint8_t txd);
uint8_t INA3221_IIC_Read_Byte(unsigned char ack);
void INA3221_Init(void);
    void INA3221_SendData(uint8_t addr,uint8_t reg,uint16_t data);
        void INA3221_SetRegPointer(uint8_t addr,uint8_t reg);
            uint16_t INA3221_ReadData(uint8_t addr);
            uint16_t INA3221_GetVoltage(uint8_t addr,uint8_t channel);
            uint16_t INA3221_GetShuntVoltage(uint8_t addr,uint8_t channel);
                
            
 #endif