Fix multiple compilation warnings

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

LICENSE

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+MIT License
+
+Copyright (c) 2022 Tinyu Zhao
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# INA3221 Library
+Arduino library for INA3221 current and voltage sensor.

examples/get_started/get_started.ino

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+#include <Wire.h>
+#include <INA3221.h>
+
+#define SERIAL_SPEED     115200  // serial baud rate
+#define PRINT_DEC_POINTS 3       // decimal points to print
+
+// Set I2C address to 0x41 (A0 pin -> VCC)
+INA3221 ina_0(INA3221_ADDR40_GND);
+INA3221 ina_1(INA3221_ADDR41_VCC);
+
+void current_measure_init() {
+    ina_0.begin(&Wire);
+    ina_0.reset();
+    ina_0.setShuntRes(10, 10, 10);
+    ina_1.begin(&Wire);
+    ina_1.reset();
+    ina_1.setShuntRes(10, 10, 10);
+}
+
+void setup() {
+    Serial.begin(SERIAL_SPEED);
+    current_measure_init();
+
+    while (!Serial) {
+        delay(1);
+    }
+    // Set shunt resistors to 10 mOhm for all channels
+}
+
+void loop() {
+    Serial.printf(
+        "A1%3.0fma %1.1fV A2%3.0fma %1.1fV\r\n",
+        ina_0.getCurrent(INA3221_CH1) * 1000, ina_0.getVoltage(INA3221_CH1),
+        ina_0.getCurrent(INA3221_CH2) * 1000, ina_0.getVoltage(INA3221_CH2));
+    Serial.printf(
+        "B1%3.0fma %1.1fV B2%3.0fma %1.1fV\r\n",
+        ina_0.getCurrent(INA3221_CH3) * 1000, ina_0.getVoltage(INA3221_CH3),
+        ina_1.getCurrent(INA3221_CH1) * 1000, ina_1.getVoltage(INA3221_CH1));
+    Serial.printf(
+        "C1%3.0fma %1.1fV C2%3.0fma %1.1fV\r\n\n",
+        ina_1.getCurrent(INA3221_CH2) * 1000, ina_1.getVoltage(INA3221_CH2),
+        ina_1.getCurrent(INA3221_CH3) * 1000, ina_1.getVoltage(INA3221_CH3));
+
+    delay(1000);
+}

examples/offset_compensation/offset_compensation.ino

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+#include <Wire.h>
+#include <INA3221.h>
+
+#define SERIAL_SPEED     115200  // serial baud rate
+#define PRINT_DEC_POINTS 3       // decimal points to print
+
+// Set I2C address to 0x41 (A0 pin -> VCC)
+INA3221 ina3221(INA3221_ADDR40_GND);
+
+void setup() {
+    Serial.begin(SERIAL_SPEED);
+
+    while (!Serial) {
+        delay(1);
+    }
+
+    ina3221.begin();
+    ina3221.reset();
+
+    // Set shunt resistors to 10 mOhm for all channels
+    ina3221.setShuntRes(10, 10, 10);
+
+    // Set series filter resistors to 10 Ohm for all channels.
+    // Series filter resistors introduce error to the current measurement.
+    // The error can be estimated and depends on the resitor values and the bus
+    // voltage.
+    ina3221.setFilterRes(10, 10, 10);
+}
+
+void loop() {
+    float current[3];
+    float current_compensated[3];
+    float voltage[3];
+
+    current[0]             = ina3221.getCurrent(INA3221_CH1);
+    current_compensated[0] = ina3221.getCurrentCompensated(INA3221_CH1);
+    voltage[0]             = ina3221.getVoltage(INA3221_CH1);
+
+    current[1]             = ina3221.getCurrent(INA3221_CH2);
+    current_compensated[1] = ina3221.getCurrentCompensated(INA3221_CH2);
+    voltage[1]             = ina3221.getVoltage(INA3221_CH2);
+
+    current[2]             = ina3221.getCurrent(INA3221_CH3);
+    current_compensated[2] = ina3221.getCurrentCompensated(INA3221_CH3);
+    voltage[2]             = ina3221.getVoltage(INA3221_CH3);
+
+    Serial.print("Channel 1: \n Current: ");
+    Serial.print(current[0], PRINT_DEC_POINTS);
+    Serial.print("A\n Compensated current: ");
+    Serial.print(current_compensated[0], PRINT_DEC_POINTS);
+    Serial.print("\n Voltage: ");
+    Serial.print(voltage[0], PRINT_DEC_POINTS);
+    Serial.println("V");
+
+    Serial.print("Channel 2: \n Current: ");
+    Serial.print(current[1], PRINT_DEC_POINTS);
+    Serial.print("A\n Compensated current: ");
+    Serial.print(current_compensated[1], PRINT_DEC_POINTS);
+    Serial.print("\n Voltage: ");
+    Serial.print(voltage[1], PRINT_DEC_POINTS);
+    Serial.println("V");
+
+    Serial.print("Channel 3: \n Current: ");
+    Serial.print(current[2], PRINT_DEC_POINTS);
+    Serial.print("A\n Compensated current: ");
+    Serial.print(current_compensated[2], PRINT_DEC_POINTS);
+    Serial.print("\n Voltage: ");
+    Serial.print(voltage[2], PRINT_DEC_POINTS);
+    Serial.println("V\n");
+
+    delay(1000);
+}

library.json

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+{
+  "name": "INA3221",
+  "description": "Library for INA3221 Chip",
+  "keywords": "INA3221 current and voltage sensor",
+  "authors": {
+    "name": "Tinyu",
+    "url": "https://github.com/Tinyu-Zhao"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/Tinyu-Zhao/INA3221.git"
+  },
+  "version": "0.0.1",
+  "frameworks": "arduino",
+  "platforms": "espressif32"
+}

library.properties

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+name=INA3221
+version=0.0.1
+author=Tinyu
+maintainer=Tinyu <Tinyu.Zhao@gmail.com>
+sentence=INA3221 Triple-Channel Sensor Driver.
+paragraph=INA3221 Triple-Channel Sensor Driver.
+category=Sensors
+url=https://github.com/Tinyu-Zhao/INA3221
+architectures=*