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afsk/Adafruit_INA219.h

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+/*!
+ * @file Adafruit_INA219.h
+ *
+ * This is a library for the Adafruit INA219 breakout board
+ * ----> https://www.adafruit.com/products/904
+ *
+ * Adafruit invests time and resources providing this open source code,
+ * please support Adafruit and open-source hardware by purchasing
+ * products from Adafruit!
+ *
+ * Written by Kevin "KTOWN" Townsend for Adafruit Industries.
+ *
+ * BSD license, all text here must be included in any redistribution.
+ *
+ * Converted to C for Raspberry Pi by Alan Johnston KU2Y
+ *
+ */
+
+#include <wiringPi.h>
+
+/** default I2C address **/
+#define INA219_ADDRESS (0x40) // 1000000 (A0+A1=GND)
+
+/** read **/
+#define INA219_READ (0x01)
+
+/*=========================================================================
+    CONFIG REGISTER (R/W)
+**************************************************************************/
+
+/** config register address **/
+#define INA219_REG_CONFIG (0x00)
+
+/** reset bit **/
+#define INA219_CONFIG_RESET (0x8000) // Reset Bit
+
+/** mask for bus voltage range **/
+#define INA219_CONFIG_BVOLTAGERANGE_MASK (0x2000) // Bus Voltage Range Mask
+
+/** bus voltage range values **/
+enum {
+  INA219_CONFIG_BVOLTAGERANGE_16V = (0x0000), // 0-16V Range
+  INA219_CONFIG_BVOLTAGERANGE_32V = (0x2000), // 0-32V Range
+};
+
+/** mask for gain bits **/
+#define INA219_CONFIG_GAIN_MASK (0x1800) // Gain Mask
+
+/** values for gain bits **/
+enum {
+  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
+};
+
+/** mask for bus ADC resolution bits **/
+#define INA219_CONFIG_BADCRES_MASK (0x0780)
+
+/** values for bus ADC resolution **/
+enum {
+  INA219_CONFIG_BADCRES_9BIT = (0x0000),  // 9-bit bus res = 0..511
+  INA219_CONFIG_BADCRES_10BIT = (0x0080), // 10-bit bus res = 0..1023
+  INA219_CONFIG_BADCRES_11BIT = (0x0100), // 11-bit bus res = 0..2047
+  INA219_CONFIG_BADCRES_12BIT = (0x0180), // 12-bit bus res = 0..4097
+};
+
+/** mask for shunt ADC resolution bits **/
+#define INA219_CONFIG_SADCRES_MASK                                             \
+  (0x0078) // Shunt ADC Resolution and Averaging Mask
+
+/** values for shunt ADC resolution **/
+enum {
+  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
+};
+
+/** mask for operating mode bits **/
+#define INA219_CONFIG_MODE_MASK (0x0007) // Operating Mode Mask
+
+/** values for operating mode **/
+enum {
+  INA219_CONFIG_MODE_POWERDOWN,
+  INA219_CONFIG_MODE_SVOLT_TRIGGERED,
+  INA219_CONFIG_MODE_BVOLT_TRIGGERED,
+  INA219_CONFIG_MODE_SANDBVOLT_TRIGGERED,
+  INA219_CONFIG_MODE_ADCOFF,
+  INA219_CONFIG_MODE_SVOLT_CONTINUOUS,
+  INA219_CONFIG_MODE_BVOLT_CONTINUOUS,
+  INA219_CONFIG_MODE_SANDBVOLT_CONTINUOUS
+};
+
+/** shunt voltage register **/
+#define INA219_REG_SHUNTVOLTAGE (0x01)
+
+/** bus voltage register **/
+#define INA219_REG_BUSVOLTAGE (0x02)
+
+/** power register **/
+#define INA219_REG_POWER (0x03)
+
+/** current register **/
+#define INA219_REG_CURRENT (0x04)
+
+/** calibration register **/
+#define INA219_REG_CALIBRATION (0x05)
+
+/*!
+ *   functions for interacting with INA219
+ *  current/power monitor IC
+ */
+  //void begin(TwoWire *theWire = &Wire);
+  void setCalibration_32V_2A(int fd);
+  void setCalibration_32V_1A(int fd);
+  void setCalibration_16V_400mA(int fd);
+  void setCalibration_16V_2A(int fd);
+  float getBusVoltage_V(int fd);
+  float getShuntVoltage_mV(int fd);
+  float getCurrent_mA(int fd);
+  float getPower_mW(int fd);
+  void powerSave(int fd, int on);
+
+  uint8_t ina219_i2caddr;
+  //uint32_t ina219_calValue;
+  uint16_t ina219_calValue;
+  uint16_t ina219_config;
+  // The following multipliers are used to convert raw current and power
+  // values to mA and mW, taking into account the current config settings
+  uint32_t ina219_currentDivider_mA;
+  float ina219_powerMultiplier_mW;
+
+  void init();
+  void wireWriteRegister(int fd, uint8_t reg, uint16_t value);
+  uint16_t wireReadRegister(int fd, uint8_t reg);
+  int16_t getBusVoltage_raw(int fd);
+  int16_t getShuntVoltage_raw(int fd);
+  int16_t getCurrent_raw(int fd);
+  int16_t getPower_raw(int fd);