INA219 技术笔记
四、代码主体（仅参考，非完全体）
/*.c-------------------------------------------------------------------------------------------------------------------------------------*/
//获取电压（单位：mv）
int sensor_vbus_voltage_mv_get( struct current_sensor* sensor )
{
static unsigned int value_reg;
value_reg = cur_sensor_register_read( sensor, INA219_REG_BUSVOLTAGE );
//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
return (int)(( value_reg >> 3)*4);
}
//获取电流（单位：mA）
int sensor_current_ma_get( struct current_sensor* sensor )
{
static int value_reg;//static unsigned int
cur_sensor_register_write( sensor, INA219_REG_CONFIG,INA219_CONFIG_value);
value_reg = cur_sensor_register_read( sensor, INA219_REG_CURRENT);
if( value_reg < 0)
{ //如果是负数，说明电流方向为反，此处取绝对值
value_reg = -value_reg;
}
_nop();
_nop();
return (int)(value_reg * 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
}
//获取当前功率（单位：mw）
int sensor_power_mw_get( struct current_sensor* sensor )
{
unsigned int value_reg;
value_reg = cur_sensor_register_read( sensor, INA219_REG_POWER);
_nop();
_nop();
return (int)(value_reg * 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
}
/* ------------------------------------------------------------------------------------------------------------------------ */
/* ------------------------------------------------------------------------------------------------------------------------ */
void cur_sensor_initial(void)
{
unsigned char i = 0;
for( i = 0; i < SENSOR_NUM; i++ )
{
/* initial sensor i */
cur_sensor[i].dev_addr = sensor_addr[i];
cur_sensor_register_write( &cur_sensor[i], INA219_REG_CONFIG, INA219_CONFIG_value);
cur_sensor_register_write( &cur_sensor[i], INA219_REG_CALIBRATION, INA_CAL);
}
}
/*.h-------------------------------------------------------------------------------------------------------------------------------------*/
// 寄存器地址
#define INA219_REG_CONFIG (unsigned char)(0x00) // 模式配置寄存器 (R/W)
#define INA219_REG_SHUNTVOLTAGE (unsigned char)(0x01) // 分流电阻电压寄存器 (R)
#define INA219_REG_BUSVOLTAGE (unsigned char)(0x02) // 总线电压寄存器 (R)
#define INA219_REG_POWER (unsigned char)(0x03) // 功率寄存器 (R)
#define INA219_REG_CURRENT (unsigned char)(0x04) // 电流寄存器 (R)
#define INA219_REG_CALIBRATION (unsigned char)(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 0.1 //阻值大小（单位ohm）
#define INA_I_MAX 3 //硬件最大检测电流（单位：A） INA219_CONFIG_GAIN_电压/INA_R
#define IAN_I_LSB 0.1 //(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 2 //(0x03)检测出值对应每位功率值 = 20 * 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
#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)