Copy INA219 files from subfact_pi_ina219 repo

these came from:
    https://github.com/scottjw/subfact_pi_ina219.git
    commit 0c6f5965874d006b93f04bee95f8f892866d5705

Original authors:
    Author: Scott J. Williamson <scott@sjwilliamson.ca>
    Author: Alexandre Scieux <scieux.alexandre@gmail.com>

Signed-off-by: Matt Gumbel <mkg@protonmail.ch>

Author: mattismyname

Adafruit_INA219/Subfact_ina219.py

@@ -0,0 +1,180 @@
+#!/usr/bin/python
+
+import time
+import smbus
+from Adafruit_I2C import Adafruit_I2C
+
+# ===========================================================================
+# INA219 Class
+# ===========================================================================
+
+class INA219:
+	i2c = None
+
+# ===========================================================================
+#   I2C ADDRESS/BITS
+# ==========================================================================
+	__INA219_ADDRESS                         = 0x40    # 1000000 (A0+A1=GND)
+	__INA219_READ                            = 0x01
+# ===========================================================================
+
+# ===========================================================================
+#    CONFIG REGISTER (R/W)
+# ===========================================================================
+	__INA219_REG_CONFIG                      = 0x00
+# ===========================================================================
+	__INA219_CONFIG_RESET                    = 0x8000  # Reset Bit
+	__INA219_CONFIG_BVOLTAGERANGE_MASK       = 0x2000  # Bus Voltage Range Mask
+	__INA219_CONFIG_BVOLTAGERANGE_16V        = 0x0000  # 0-16V Range
+	__INA219_CONFIG_BVOLTAGERANGE_32V        = 0x2000  # 0-32V Range
+
+	__INA219_CONFIG_GAIN_MASK                = 0x1800  # Gain Mask
+	__INA219_CONFIG_GAIN_1_40MV              = 0x0000  # Gain 1, 40mV Range
+	__INA219_CONFIG_GAIN_2_80MV              = 0x0800  # Gain 2, 80mV Range
+	__INA219_CONFIG_GAIN_4_160MV             = 0x1000  # Gain 4, 160mV Range
+	__INA219_CONFIG_GAIN_8_320MV             = 0x1800  # Gain 8, 320mV Range
+
+	__INA219_CONFIG_BADCRES_MASK             = 0x0780  # Bus ADC Resolution Mask
+	__INA219_CONFIG_BADCRES_9BIT             = 0x0080  # 9-bit bus res = 0..511
+	__INA219_CONFIG_BADCRES_10BIT            = 0x0100  # 10-bit bus res = 0..1023
+	__INA219_CONFIG_BADCRES_11BIT            = 0x0200  # 11-bit bus res = 0..2047
+	__INA219_CONFIG_BADCRES_12BIT            = 0x0400  # 12-bit bus res = 0..4097
+
+	__INA219_CONFIG_SADCRES_MASK             = 0x0078  # Shunt ADC Resolution and Averaging Mask
+	__INA219_CONFIG_SADCRES_9BIT_1S_84US     = 0x0000  # 1 x 9-bit shunt sample
+	__INA219_CONFIG_SADCRES_10BIT_1S_148US   = 0x0008  # 1 x 10-bit shunt sample
+	__INA219_CONFIG_SADCRES_11BIT_1S_276US   = 0x0010  # 1 x 11-bit shunt sample
+	__INA219_CONFIG_SADCRES_12BIT_1S_532US   = 0x0018  # 1 x 12-bit shunt sample
+	__INA219_CONFIG_SADCRES_12BIT_2S_1060US  = 0x0048  # 2 x 12-bit shunt samples averaged together
+	__INA219_CONFIG_SADCRES_12BIT_4S_2130US  = 0x0050  # 4 x 12-bit shunt samples averaged together
+	__INA219_CONFIG_SADCRES_12BIT_8S_4260US  = 0x0058  # 8 x 12-bit shunt samples averaged together
+	__INA219_CONFIG_SADCRES_12BIT_16S_8510US = 0x0060  # 16 x 12-bit shunt samples averaged together
+	__INA219_CONFIG_SADCRES_12BIT_32S_17MS   = 0x0068  # 32 x 12-bit shunt samples averaged together
+	__INA219_CONFIG_SADCRES_12BIT_64S_34MS   = 0x0070  # 64 x 12-bit shunt samples averaged together
+	__INA219_CONFIG_SADCRES_12BIT_128S_69MS  = 0x0078  # 128 x 12-bit shunt samples averaged together
+
+	__INA219_CONFIG_MODE_MASK                = 0x0007  # Operating Mode Mask
+	__INA219_CONFIG_MODE_POWERDOWN           = 0x0000
+	__INA219_CONFIG_MODE_SVOLT_TRIGGERED     = 0x0001
+	__INA219_CONFIG_MODE_BVOLT_TRIGGERED     = 0x0002
+	__INA219_CONFIG_MODE_SANDBVOLT_TRIGGERED = 0x0003
+	__INA219_CONFIG_MODE_ADCOFF              = 0x0004
+	__INA219_CONFIG_MODE_SVOLT_CONTINUOUS    = 0x0005
+	__INA219_CONFIG_MODE_BVOLT_CONTINUOUS    = 0x0006
+	__INA219_CONFIG_MODE_SANDBVOLT_CONTINUOUS = 0x0007
+# ===========================================================================
+
+# ===========================================================================
+#   SHUNT VOLTAGE REGISTER (R)
+# ===========================================================================
+	__INA219_REG_SHUNTVOLTAGE                = 0x01
+# ===========================================================================
+
+# ===========================================================================
+#   BUS VOLTAGE REGISTER (R)
+# ===========================================================================
+	__INA219_REG_BUSVOLTAGE                  = 0x02
+# ===========================================================================
+
+# ===========================================================================
+#   POWER REGISTER (R)
+# ===========================================================================
+	__INA219_REG_POWER                       = 0x03
+# ===========================================================================
+
+# ==========================================================================
+#    CURRENT REGISTER (R)
+# ===========================================================================
+	__INA219_REG_CURRENT                     = 0x04
+# ===========================================================================
+
+# ===========================================================================
+#    CALIBRATION REGISTER (R/W)
+# ===========================================================================
+	__INA219_REG_CALIBRATION                 = 0x05
+# ===========================================================================
+
+	# Constructor
+	def __init__(self, address=0x40, debug=False):
+		self.i2c = Adafruit_I2C(address, debug=False)
+		self.address = address
+		self.debug = debug
+		
+		self.ina219SetCalibration_32V_2A()
+	
+	def twosToInt(self, val, len):
+		# Convert twos compliment to integer
+
+		if(val & (1 << len - 1)):
+			val = val - (1<<len)
+
+		return val
+
+	def ina219SetCalibration_32V_2A(self):
+		self.ina219_currentDivider_mA = 10  # Current LSB = 100uA per bit (1000/100 = 10)
+		self.ina219_powerDivider_mW = 2     # Power LSB = 1mW per bit (2/1)
+		
+		# Set Calibration register to 'Cal' calculated above	
+		bytes = [(0x1000 >> 8) & 0xFF, 0x1000 & 0xFF]
+		self.i2c.writeList(self.__INA219_REG_CALIBRATION, bytes)
+		
+		# Set Config register to take into account the settings above
+		config = self.__INA219_CONFIG_BVOLTAGERANGE_32V | \
+				 self.__INA219_CONFIG_GAIN_8_320MV | \
+				 self.__INA219_CONFIG_BADCRES_12BIT | \
+				 self.__INA219_CONFIG_SADCRES_12BIT_1S_532US | \
+				 self.__INA219_CONFIG_MODE_SANDBVOLT_CONTINUOUS
+		
+		bytes = [(config >> 8) & 0xFF, config & 0xFF]
+		self.i2c.writeList(self.__INA219_REG_CONFIG, bytes)
+
+	def getBusVoltage_raw(self):
+		result = self.i2c.readU16(self.__INA219_REG_BUSVOLTAGE)
+		
+		# Shift to the right 3 to drop CNVR and OVF and multiply by LSB
+		return (result >> 3) * 4
+		
+	def getShuntVoltage_raw(self):
+		result = self.i2c.readList(self.__INA219_REG_SHUNTVOLTAGE,2)
+		if (result[0] >> 7 == 1):
+			testint = (result[0]*256 + result[1])
+			othernew = self.twosToInt(testint, 16)
+			return othernew
+		else:
+			return (result[0] << 8) | (result[1])
+
+	def getCurrent_raw(self):
+		result = self.i2c.readList(self.__INA219_REG_CURRENT,2)
+		if (result[0] >> 7 == 1):
+			testint = (result[0]*256 + result[1])
+			othernew = self.twosToInt(testint, 16)
+			return othernew
+		else:
+			return (result[0] << 8) | (result[1])
+
+	def getPower_raw(self):
+		result = self.i2c.readList(self.__INA219_REG_POWER,2)
+		if (result[0] >> 7 == 1):
+			testint = (result[0]*256 + result[1])
+			othernew = self.twosToInt(testint, 16)
+			return othernew
+		else:
+			return (result[0] << 8) | (result[1])
+
+	def getShuntVoltage_mV(self):
+		value = self.getShuntVoltage_raw()
+		return value * 0.01
+		
+	def getBusVoltage_V(self):
+		value = self.getBusVoltage_raw()
+		return value * 0.001
+		
+	def getCurrent_mA(self):
+		valueDec = self.getCurrent_raw()
+		valueDec /= self.ina219_currentDivider_mA
+		return valueDec
+		
+	def getPower_mW(self):
+		valueDec = self.getPower_raw()
+		valueDec /= self.ina219_powerDivider_mW
+		return valueDec

Adafruit_INA219/ina219_cacti.py

@@ -0,0 +1,8 @@
+#!/usr/bin/python
+
+from Subfact_ina219 import INA219
+
+ina = INA219()
+result = ina.getBusVoltage_V()
+
+print "shunt:%.3f bus:%.3f current:%d power:%d" % ( ina.getShuntVoltage_mV(), ina.getBusVoltage_V(), ina.getCurrent_mA(), ina.getPower_mW() )

Adafruit_INA219/ina219_example.py

@@ -0,0 +1,10 @@
+#!/usr/bin/python
+
+from Subfact_ina219 import INA219
+import time
+
+ina = INA219()
+
+while True:
+    result = ina.getBusVoltage_V()
+    print "{} Shunt: {} mV, Bus: {} V, Current: {} mA".format(time.time(), ina.getShuntVoltage_mV(), ina.getBusVoltage_V(), ina.getCurrent_mA())