INA219读取电流不正常

芯片应该没坏  因为电压一直可以正常读取。这是ina219部分的电路，实际的采样电阻换成了0.05Ω。

这是我ina219的驱动,我实在找不到问题在哪，求助大神！

//////////////////////////////////////////////////////////////////

ina219.c

#include "ina219.h"

#ifdef INA_INSIDE_IIC

void INA_IIC_Delay()
{
unsigned char x;

for(x = 1; x > 0; x--)
{
__NOP();__NOP();__NOP();__NOP();__NOP();
}
}

void INA_IIC_INIT(void) //IIC初始化
{
GPIO_InitTypeDef GPIO_INIT;
RCC_APB2PeriphClockCmd(IIC_RCC,ENABLE);

GPIO_INIT.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_INIT.GPIO_Pin = IIC_SDA | IIC_SCL;
GPIO_INIT.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(IIC_PORT, &GPIO_INIT);

IIC_SDA_H;
IIC_SCL_H;
}

void INA_IIC_SDA_OUT(void) //SDA配置为输出
{
GPIO_InitTypeDef GPIO_INIT;
GPIO_INIT.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_INIT.GPIO_Pin = IIC_SDA ;
GPIO_INIT.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(IIC_PORT, &GPIO_INIT);
}

void INA_IIC_SDA_IN(void) //SDA配置为输入
{
GPIO_InitTypeDef GPIO_INIT;
GPIO_INIT.GPIO_Mode = GPIO_Mode_IPU;
GPIO_INIT.GPIO_Pin = IIC_SDA ;
GPIO_INIT.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(IIC_PORT, &GPIO_INIT);
}

void INA_IIC_Start(void) //开始信号
{
IIC_SDA_H;
IIC_SCL_H;
INA_IIC_Delay();
IIC_SDA_L;
INA_IIC_Delay();
IIC_SDA_L;
}

void INA_IIC_Stop(void) //结束信号
{
IIC_SDA_L;
IIC_SCL_H;
INA_IIC_Delay();
IIC_SDA_H;
INA_IIC_Delay();
IIC_SCL_L;

IIC_SCL_H;
IIC_SDA_H;
}

bool INA_IIC_ACK_Read(void) //读取应答信号
{
bool ack;

IIC_SDA_H;
INA_IIC_SDA_IN();

IIC_SCL_H;
INA_IIC_Delay();
if(IIC_SDA_READ() == SET) //读取iic-sda的电平信号，set为非零
{
ack = false;
}
else
{
ack = true;
}
IIC_SCL_L;
INA_IIC_SDA_OUT();

return ack;
}

void INA_IIC_ACK_Send(bool ack) //发送应答信号
{
IIC_SCL_L;
if(ack == true)
{
IIC_SDA_L;
}
else
{
IIC_SDA_H;
}
IIC_SCL_H;
INA_IIC_Delay();
IIC_SCL_L;
}

void INA_IIC_Send_Byte(unsigned char byte) //IIC发送一位数据
{
unsigned char i;

IIC_SCL_L; //SCL置为低电平
for(i = 0; i < 8; i ++)
{
if(byte & 0x80 )
{
IIC_SDA_H;
}
else
{
IIC_SDA_L;
}
IIC_SCL_H;
INA_IIC_Delay();
IIC_SCL_L;
INA_IIC_Delay();
byte <<= 1;
}
INA_IIC_ACK_Read();
}

unsigned char INA_IIC_Read_Byte(void) //IIC读取一位数据
{
unsigned char i, byte = 0;

INA_IIC_SDA_IN();
for(i = 0; i < 8; i++)
{
IIC_SCL_H;
byte <<= 1;
if(IIC_SDA_READ() == SET)
{
byte |= 0x01;
}
else
{
byte &= 0xFE;
}
IIC_SCL_L;
INA_IIC_Delay();
}
INA_IIC_SDA_OUT();

return byte;
}

#endif

void INA_Read_Byte_s(unsigned char reg, unsigned char *data) //读两位数据
{
INA_IIC_Start();
INA_IIC_Send_Byte(INA219_ADDRESS); //发送INA219地址s
INA_IIC_Send_Byte(reg);

INA_IIC_Start();
INA_IIC_Send_Byte(INA219_ADDRESS + 0x01); //设置iic为读模式
*data = INA_IIC_Read_Byte();
data ++;
INA_IIC_ACK_Send(1);
*data = INA_IIC_Read_Byte();
INA_IIC_ACK_Send(0);
INA_IIC_Stop();
}

void INA_REG_Write(unsigned char reg, unsigned int data) //写寄存器 测试成功
{
unsigned char data_temp[2];

data_temp[0] = (unsigned char )(data >> 8); //高八位
data_temp[1] = (unsigned char )(data & 0xFF); //低八位
INA_IIC_Start();
INA_IIC_Send_Byte(INA219_ADDRESS); //发送INA219地址
INA_IIC_Send_Byte(reg); //发送寄存器地址
INA_IIC_Send_Byte(data_temp[0]); //发送高8位数据
data ++;
INA_IIC_Send_Byte(data_temp[1]) ; //发送低8位数据
INA_IIC_Stop();
}

void INA_Init(void )
{
INA_IIC_INIT(); //第一路iic初始化
INA_IIC_INIT_2(); //第二路iic初始化

INA_IIC_Delay();
INA_REG_Write(INA219_REG_CONFIG,0x3c1f); //配置模式
INA_REG_Write(INA219_REG_CALIBRATION,INA_CAL); //INA_CAL 4096
}

unsigned int INA_GET_Voltage_MV(void) //获取电压（单位：mv）
{
unsigned char data_temp[2];

INA_REG_Write(INA219_REG_CONFIG, INA219_CONFIG_value);
INA_Read_Byte_s(INA219_REG_BUSVOLTAGE, data_temp);
return (int)((((data_temp[0] << 8) + data_temp[1]) >> 3) * 4); //右移3为去掉：bit2，CNVR，OVF三位，再乘以 4MV (官方文档规定)，得到当前总线的电压值
}

unsigned int INA_GET_Current_MA(void) //获取电流（单位：mA）
{
unsigned char data_temp[2] = {0};

INA_REG_Write(INA219_REG_CONFIG, INA219_CONFIG_value);
INA_Read_Byte_s(INA219_REG_CURRENT, data_temp);

return (int)((((data_temp[0] << 8) + data_temp[1])) * IAN_I_LSB); //得到寄存器的值在乘以每位对应的值（IAN_I_LSB）得到实际的电流
}

unsigned int INA_GET_ShuntVoltage_MV(void)
{
 unsigned char data_temp[2];

 INA_REG_Write(INA219_REG_CONFIG, INA219_CONFIG_value);
 INA_Read_Byte_s(INA219_REG_SHUNTVOLTAGE, data_temp); 
 return (int)(((data_temp[0] << 8) + data_temp[1]));
}

unsigned int INA_GET_Power_MW(void) //获取当前功率（单位：mw）
{
unsigned char data_temp[2];

INA_REG_Write(INA219_REG_CONFIG, INA219_CONFIG_value);
INA_Read_Byte_s(INA219_REG_POWER, data_temp);

return (int)(((data_temp[0] << 8) + data_temp[1]) * INA_Power_LSB); //得到寄存器的值在乘以每位对应的值（INA_Power_LSB）得到实际的功率
}

//////////////////////////////////////////////////////

ina219.h

#ifndef _INA219_H_
#define _INA219_H_
#include "stm32f10x.h"
#include "stdbool.h"
// I2C Address Options
/*
#define INA219_I2C_ADDRESS_CONF_0 (u8)(0x40 << 1) // A0 = GND, A1 = GND
#define INA219_I2C_ADDRESS_CONF_1 (u8)(0x41 << 1) // A0 = VS+, A1 = GND
#define INA219_I2C_ADDRESS_CONF_2 (u8)(0x42 << 1) // A0 = SDA, A1 = GND
#define INA219_I2C_ADDRESS_CONF_3 (u8)(0x43 << 1) // A0 = SCL, A1 = GND
#define INA219_I2C_ADDRESS_CONF_4 (u8)(0x44 << 1) // A0 = GND, A1 = VS+
#define INA219_I2C_ADDRESS_CONF_5 (u8)(0x45 << 1) // A0 = VS+, A1 = VS+
#define INA219_I2C_ADDRESS_CONF_6 (u8)(0x46 << 1) // A0 = SDA, A1 = VS+
#define INA219_I2C_ADDRESS_CONF_7 (u8)(0x47 << 1) // A0 = SCL, A1 = VS+
#define INA219_I2C_ADDRESS_CONF_8 (u8)(0x48 << 1) // A0 = GND, A1 = SDA
#define INA219_I2C_ADDRESS_CONF_9 (u8)(0x49 << 1) // A0 = VS+, A1 = SDA
#define INA219_I2C_ADDRESS_CONF_A (u8)(0x4A << 1) // A0 = SDA, A1 = SDA
#define INA219_I2C_ADDRESS_CONF_B (u8)(0x4B << 1) // A0 = SCL, A1 = SDA
#define INA219_I2C_ADDRESS_CONF_C (u8)(0x4C << 1) // A0 = GND, A1 = SCL
#define INA219_I2C_ADDRESS_CONF_D (u8)(0x4D << 1) // A0 = VS+, A1 = SCL
#define INA219_I2C_ADDRESS_CONF_E (u8)(0x4E << 1) // A0 = SDA, A1 = SCL
#define INA219_I2C_ADDRESS_CONF_F (u8)(0x4F << 1) // A0 = SCL, A1 = SCL
*/
#define INA219_ADDRESS (0x40 << 1) // A0 = GND, A1 = GND

// 寄存器地址
#define INA219_REG_CONFIG (u8)(0x00) // 模式配置寄存器 (R/W)
#define INA219_REG_SHUNTVOLTAGE (u8)(0x01) // 分流电阻电压寄存器 (R)
#define INA219_REG_BUSVOLTAGE (u8)(0x02) // 总线电压寄存器 (R)
#define INA219_REG_POWER (u8)(0x03) // 功率寄存器 (R)
#define INA219_REG_CURRENT (u8)(0x04) // 电流寄存器 (R)
#define INA219_REG_CALIBRATION (u8)(0x05) // 基准值寄存器 (R/W)

//寄存器（0x01）参数定义
#define INA219_CONFIG_RESET (0x8000) // Reset Bit

#define INA219_CONFIG_BVOLTAGERANGE_MASK (0x2000) // Bus Voltage Range Mask
#define INA219_CONFIG_BVOLTAGERANGE_16V (0x0000) // 0-16V Range
#define INA219_CONFIG_BVOLTAGERANGE_32V (0x2000) // 0-32V Range

#define INA219_CONFIG_GAIN_MASK (0x1800) // Gain Mask
#define INA219_CONFIG_GAIN_1_40MV (0x0000) // Gain 1, 40mV Range //配置检测电阻上的最大检测电压
#define INA219_CONFIG_GAIN_2_80MV (0x0800) // Gain 2, 80mV Range
#define INA219_CONFIG_GAIN_4_160MV (0x1000) // Gain 4, 160mV Range
#define INA219_CONFIG_GAIN_8_320MV (0x1800) // Gain 8, 320mV Range

#define INA219_CONFIG_BADCRES_MASK (0x0780) // Bus ADC Resolution Mask
#define INA219_CONFIG_BADCRES_9BIT (0x0080) // 9-bit bus res = 0..511
#define INA219_CONFIG_BADCRES_10BIT (0x0100) // 10-bit bus res = 0..1023
#define INA219_CONFIG_BADCRES_11BIT (0x0200) // 11-bit bus res = 0..2047
#define INA219_CONFIG_BADCRES_12BIT (0x0400) // 12-bit bus res = 0..4097

#define INA219_CONFIG_SADCRES_MASK (0x0078) // Shunt ADC Resolution and Averaging Mask
#define INA219_CONFIG_SADCRES_9BIT_1S_84US (0x0000) // 1 x 9-bit shunt sample
#define INA219_CONFIG_SADCRES_10BIT_1S_148US (0x0008) // 1 x 10-bit shunt sample
#define INA219_CONFIG_SADCRES_11BIT_1S_276US (0x0010) // 1 x 11-bit shunt sample
#define INA219_CONFIG_SADCRES_12BIT_1S_532US (0x0018) // 1 x 12-bit shunt sample
#define INA219_CONFIG_SADCRES_12BIT_2S_1060US (0x0048) // 2 x 12-bit shunt samples averaged together
#define INA219_CONFIG_SADCRES_12BIT_4S_2130US (0x0050) // 4 x 12-bit shunt samples averaged together
#define INA219_CONFIG_SADCRES_12BIT_8S_4260US (0x0058) // 8 x 12-bit shunt samples averaged together
#define INA219_CONFIG_SADCRES_12BIT_16S_8510US (0x0060) // 16 x 12-bit shunt samples averaged together
#define INA219_CONFIG_SADCRES_12BIT_32S_17MS (0x0068) // 32 x 12-bit shunt samples averaged together
#define INA219_CONFIG_SADCRES_12BIT_64S_34MS (0x0070) // 64 x 12-bit shunt samples averaged together
#define INA219_CONFIG_SADCRES_12BIT_128S_69MS (0x0078) // 128 x 12-bit shunt samples averaged together

#define INA219_CONFIG_MODE_MASK (0x0007) // Operating Mode Mask
#define INA219_CONFIG_MODE_POWERDOWN (0x0000)
#define INA219_CONFIG_MODE_SVOLT_TRIGGERED (0x0001)
#define INA219_CONFIG_MODE_BVOLT_TRIGGERED (0x0002)
#define INA219_CONFIG_MODE_SANDBVOLT_TRIGGERED (0x0003)
#define INA219_CONFIG_MODE_ADCOFF (0x0004)
#define INA219_CONFIG_MODE_SVOLT_CONTINUOUS (0x0005)
#define INA219_CONFIG_MODE_BVOLT_CONTINUOUS (0x0006)
#define INA219_CONFIG_MODE_SANDBVOLT_CONTINUOUS (0x0007)
//INA配置的参数
#define INA_R 0.025 //阻值大小（单位ohm）
#define INA_I_MAX 12 //硬件最大检测电流（单位：A） INA219_CONFIG_GAIN_电压/INA_R
#define IAN_I_LSB 0.2 //(0x04)检测出值对应每位电流值 选择接近 = (INA_I_MAX/32767(2^15))*1000(为了得到单位为A) (A)
#define INA_Power_LSB 8 //(0x03)检测出值对应每位功率值 = 12.8 * IAN_I_LSB (MW)
#define INA_CAL 4096 //(0x05)寄存器基准值
//根据上面定义设置 配置寄存器（0x00）的值：0x3C1F 0011 1100 0001 1111
#define INA219_CONFIG_value INA219_CONFIG_BVOLTAGERANGE_32V|INA219_CONFIG_GAIN_8_320MV|INA219_CONFIG_BADCRES_12BIT|INA219_CONFIG_SADCRES_12BIT_1S_532US|INA219_CONFIG_MODE_SANDBVOLT_CONTINUOUS

/*
V_bus_max = 32
V_shunt_max = 0.32
R_shunt = 0.025
MAXpossible_I = V_shunt_bus/R_shunt
MAXpossible_I = 12.8
MAX_Expected_I = 10
MIN_LSB = MAX_Expected_I/32767
MIN_LSB = 3.05e-4 = 0.000305(每位305uA）
MAX_LSB = MAX_Expected_I/4096
MAX_LSB = 24.4e-4 = 0.00244（每位2440uA）

Current_LSB = 4e-4 = 0.0004（每位400uA）
Cal = 4096
Power_LSB = 20Current_LSB
Power_LSB = 80e-4 = 0.008（每位8mW）
Max_Current = Current_LSB*32767
Max_Current = 13.11A
If Max_Current ≥ Max Possible_I
then
Max_Current_Before_Overflow = MaxPossible_I
Else
Max_Current_Before_Overflow = Max_Current
End If
(Note that Max_Current is greater than MaxPossible_I in this example.)

Max_Current_Before_Overflow = 12.8A

Max_ShuntVoltage = Max_Current_Before_Overflow * R_shunt

Max_ShuntVoltage = 0.32V

If Max_ShuntVoltage >= V_shunt_max

Max_ShuntVoltage_Before_Overflow = V_shunt_max
Else
Max_ShuntVoltage_Before_Overflow = Max_ShuntVoltage
End If
(Note that Max_ShuntVoltage is greater than V_shunt_max in this example.)

Max_ShuntVoltage_Before_Overflow = 0.32

MaximumPower = Max_Current_Before_Overflow * V_bus_max
MaximumPower =12.8 *32 = 409.6

INA219_Curren = 13.11
MeaShuntCurrent =
*/

#define INA_INSIDE_IIC //使用自带的io模拟iic
#ifdef INA_INSIDE_IIC
#define IIC_PORT GPIOB //IIC IO端口
#define IIC_RCC RCC_APB2Periph_GPIOB //端口时钟
#define IIC_SDA GPIO_Pin_7 //SDA引脚
#define IIC_SDA_H GPIO_SetBits(IIC_PORT, IIC_SDA) //拉高SDA
#define IIC_SDA_L GPIO_ResetBits(IIC_PORT, IIC_SDA) //拉低SDA
#define IIC_SDA_READ() GPIO_ReadInputDataBit(GPIOB, IIC_SDA) //读取SDA

#define IIC_SCL GPIO_Pin_6 //SCL引脚
#define IIC_SCL_H GPIO_SetBits(IIC_PORT, IIC_SCL) //拉高SCL
#define IIC_SCL_L GPIO_ResetBits(IIC_PORT, IIC_SCL) //拉低SCL
#endif

#endif

void INA_Init(void);
unsigned int INA_GET_Voltage_MV(void); //获取电压（单位：mv）
unsigned int INA_GET_Current_MA(void); //获取电流（单位：mA）
unsigned int INA_GET_Power_MW(void); //获取当前功率（单位：mw）

void INA_REG_Write(unsigned char reg, unsigned int data);

void INA_Read_Byte_s(unsigned char reg,unsigned char *data);

void INA_IIC_Delay(void);
void INA_IIC_SDA_OUT(void); //SDA配置为输出
void INA_IIC_SDA_IN(void); //SDA配置为输入
void INA_IIC_Start(void); //开始信号
void INA_IIC_Stop(void);
bool INA_IIC_ACK_Read(void);
void INA_IIC_ACK_Send(bool ack);
void INA_IIC_Send_Byte(unsigned char byte);
unsigned char INA_IIC_Read_Byte(void);

void INA_REG_Write(unsigned char reg, unsigned int data);

unsigned int INA_GET_ShuntVoltage_MV(void);

#endif