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("\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) { 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
