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
define的基本用法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();
return1;
}
}
IIC_SCL_L_3221;//时钟输出0
return0;
}
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)
{
case1:INA3221_SetRegPointer(addr,0x02);break;
case2:INA3221_SetRegPointer(addr,0x04);break;
case3:INA3221_SetRegPointer(addr,0x06);break;
default:break;
}
temp = INA3221_ReadData(addr);//printf("\r\n 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)
{
case1:INA3221_SetRegPointer(addr,0x01);break;
case2:INA3221_SetRegPointer(addr,0x03);break;
case3: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;
//}
View Code
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 #defi
ne 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
View Code
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