Initial Arduino library for BQ25628E I2C Battery Charger

- Add basic library structure with constructor, destructor, and begin()
- Include chip ID verification (0x22) in begin() function
- Add register address definitions for all BQ25628E registers
- Include test example sketch with basic functionality verification
- Add GitHub CI workflow and clang-format configuration
- Set up project structure following Adafruit library conventions

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.clang-format

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+Language: Cpp
+BasedOnStyle: Google
+IndentWidth: 2
+ColumnLimit: 80
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+BinPackArguments: true
+BinPackParameters: true
+BreakBeforeBraces: Attach
+DerivePointerAlignment: false
+PointerAlignment: Left
+SpacesBeforeTrailingComments: 1

.github/workflows/githubci.yml

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+name: Arduino Library CI
+
+on: [pull_request, push, repository_dispatch]
+
+jobs:
+ build:
+   runs-on: ubuntu-latest
+   
+   steps:
+   - uses: actions/setup-python@v1
+     with:
+       python-version: '3.x'
+   - uses: actions/checkout@v2
+   - uses: actions/checkout@v2
+     with:
+       repository: adafruit/ci-arduino
+       path: ci
+   
+   - name: pre-install
+     run: bash ci/actions_install.sh
+   
+   - name: clang
+     run: python3 ci/run-clang-format.py -e "ci/*" -e "bin/*" -r .
+   
+   - name: test platforms
+     run: python3 ci/build_platform.py main_platforms
+   
+   - name: doxygen
+     env:
+       GH_REPO_TOKEN: ${{ secrets.GH_REPO_TOKEN }}
+       PRETTYNAME : "Adafruit BQ25628E Arduino Library"
+     run: bash ci/doxy_gen_and_deploy.sh

.gitignore

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+# Datasheet files
+*.pdf
+*.txt
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+
+# IDE files
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db

Adafruit_BQ25628E.cpp

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+/*!
+ *  @file Adafruit_BQ25628E.cpp
+ *
+ *  @mainpage Adafruit BQ25628E I2C Battery Charger
+ *
+ *  @section intro_sec Introduction
+ *
+ *  This is a library for the BQ25628E I2C Battery Charger
+ *
+ *  Designed specifically to work with the Adafruit BQ25628E Breakout
+ *  ----> http://www.adafruit.com/products/
+ *
+ *  Pick one up today in the adafruit shop!
+ *
+ *  These chips use I2C to communicate, 2 pins are required to interface.
+ *
+ *  Adafruit invests time and resources providing this open source code,
+ *  please support Adafruit and open-source hardware by purchasing products
+ *  from Adafruit!
+ *
+ *  @section author Author
+ *
+ *  Limor 'ladyada' Fried with assistance from Claude Code
+ *
+ *  @section license License
+ *
+ *  MIT (see license.txt)
+ */
+
+#include "Adafruit_BQ25628E.h"
+
+/*!
+ *    @brief  Instantiates a new BQ25628E class
+ */
+Adafruit_BQ25628E::Adafruit_BQ25628E() {}
+
+/*!
+ *    @brief  Cleans up the BQ25628E
+ */
+Adafruit_BQ25628E::~Adafruit_BQ25628E() {
+  if (i2c_dev) {
+    delete i2c_dev;
+  }
+}
+
+/*!
+ *    @brief  Sets up the hardware and initializes I2C
+ *    @param  i2c_addr
+ *            The I2C address to be used.
+ *    @param  wire
+ *            The Wire object to be used for I2C connections.
+ *    @return True if initialization was successful, otherwise false.
+ */
+bool Adafruit_BQ25628E::begin(uint8_t i2c_addr, TwoWire *wire) {
+  if (i2c_dev) {
+    delete i2c_dev;
+  }
+
+  i2c_dev = new Adafruit_I2CDevice(i2c_addr, wire);
+
+  if (!i2c_dev->begin()) {
+    return false;
+  }
+
+  // Verify chip connection by reading part information register
+  Adafruit_BusIO_Register part_info_reg = Adafruit_BusIO_Register(i2c_dev, BQ25628E_REG_PART_INFORMATION);
+  uint8_t part_info = part_info_reg.read();
+  
+  // Check for valid BQ25628E part ID (0x22)
+  if (part_info != 0x22) {
+    return false;
+  }
+  
+  return true;
+}

Adafruit_BQ25628E.h

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+/*!
+ *  @file Adafruit_BQ25628E.h
+ *
+ *  This is a library for the BQ25628E I2C Battery Charger
+ *
+ *  Designed specifically to work with the Adafruit BQ25628E Breakout
+ *  ----> http://www.adafruit.com/products/
+ *
+ *  Pick one up today in the adafruit shop!
+ *
+ *  These displays use I2C to communicate, 2 pins are required to interface.
+ *
+ *  Adafruit invests time and resources providing this open source code,
+ *  please support Adafruit and open-source hardware by purchasing products
+ *  from Adafruit!
+ *
+ *  @author   Limor 'ladyada' Fried with assistance from Claude Code
+ *  @license  MIT (see license.txt)
+ */
+
+#ifndef _ADAFRUIT_BQ25628E_H
+#define _ADAFRUIT_BQ25628E_H
+
+#include "Arduino.h"
+#include <Adafruit_BusIO_Register.h>
+#include <Adafruit_I2CDevice.h>
+
+/*! Default I2C address for the BQ25628E */
+#define BQ25628E_DEFAULT_ADDR 0x6A
+
+/*! Register addresses for the BQ25628E */
+#define BQ25628E_REG_CHARGE_CURRENT_LIMIT 0x02
+#define BQ25628E_REG_CHARGE_VOLTAGE_LIMIT 0x04
+#define BQ25628E_REG_INPUT_CURRENT_LIMIT 0x06
+#define BQ25628E_REG_INPUT_VOLTAGE_LIMIT 0x08
+#define BQ25628E_REG_MINIMAL_SYSTEM_VOLTAGE 0x0E
+#define BQ25628E_REG_PRECHARGE_CONTROL 0x10
+#define BQ25628E_REG_TERMINATION_CONTROL 0x12
+#define BQ25628E_REG_CHARGE_CONTROL 0x14
+#define BQ25628E_REG_CHARGE_TIMER_CONTROL 0x15
+#define BQ25628E_REG_CHARGER_CONTROL_0 0x16
+#define BQ25628E_REG_CHARGER_CONTROL_1 0x17
+#define BQ25628E_REG_CHARGER_CONTROL_2 0x18
+#define BQ25628E_REG_CHARGER_CONTROL_3 0x19
+#define BQ25628E_REG_NTC_CONTROL_0 0x1A
+#define BQ25628E_REG_NTC_CONTROL_1 0x1B
+#define BQ25628E_REG_NTC_CONTROL_2 0x1C
+#define BQ25628E_REG_CHARGER_STATUS_0 0x1D
+#define BQ25628E_REG_CHARGER_STATUS_1 0x1E
+#define BQ25628E_REG_FAULT_STATUS_0 0x1F
+#define BQ25628E_REG_CHARGER_FLAG_0 0x20
+#define BQ25628E_REG_CHARGER_FLAG_1 0x21
+#define BQ25628E_REG_FAULT_FLAG_0 0x22
+#define BQ25628E_REG_CHARGER_MASK_0 0x23
+#define BQ25628E_REG_CHARGER_MASK_1 0x24
+#define BQ25628E_REG_FAULT_MASK_0 0x25
+#define BQ25628E_REG_ADC_CONTROL 0x26
+#define BQ25628E_REG_ADC_FUNCTION_DISABLE_0 0x27
+#define BQ25628E_REG_IBUS_ADC 0x28
+#define BQ25628E_REG_IBAT_ADC 0x2A
+#define BQ25628E_REG_VBUS_ADC 0x2C
+#define BQ25628E_REG_VPMID_ADC 0x2E
+#define BQ25628E_REG_VBAT_ADC 0x30
+#define BQ25628E_REG_VSYS_ADC 0x32
+#define BQ25628E_REG_TS_ADC 0x34
+#define BQ25628E_REG_TDIE_ADC 0x36
+#define BQ25628E_REG_PART_INFORMATION 0x38
+
+/*!
+ * @brief Class that stores state and functions for interacting with
+ *        the BQ25628E I2C Battery Charger
+ */
+class Adafruit_BQ25628E {
+public:
+  Adafruit_BQ25628E();
+  ~Adafruit_BQ25628E();
+  bool begin(uint8_t i2c_addr = BQ25628E_DEFAULT_ADDR, TwoWire *wire = &Wire);
+
+private:
+  Adafruit_I2CDevice *i2c_dev; /*!< Pointer to I2C bus interface */
+};
+
+#endif

README.md

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+# Adafruit BQ25628E Library [![Build Status](https://github.com/adafruit/Adafruit_BQ25628E/workflows/Arduino%20Library%20CI/badge.svg)](https://github.com/adafruit/Adafruit_BQ25628E/actions)[![Documentation](https://github.com/adafruit/ci-arduino/blob/master/assets/doxygen_badge.svg)](http://adafruit.github.io/Adafruit_BQ25628E/html/index.html)
+
+Arduino library for the BQ25628E I2C Battery Charger with Power Path Management
+
+## About the BQ25628E
+
+The BQ25628E is a 1-cell Li-Ion battery charger with power path management:
+- 2A charging current capability
+- I2C interface for control and monitoring
+- Power path management for seamless operation
+- Integrated ADC for voltage and current monitoring
+- Configurable charging parameters
+- Safety features including thermal regulation
+
+## Installation
+
+Download and install the library using the Arduino Library Manager or by downloading the latest release from GitHub.
+
+### Dependencies
+
+This library requires:
+- [Adafruit BusIO](https://github.com/adafruit/Adafruit_BusIO)
+
+## Hardware
+
+Connect the BQ25628E to your microcontroller via I2C. The default I2C address is 0x6A.
+
+## License
+
+MIT License. See LICENSE file for details.
+
+## Contributing
+
+Contributions are welcome! Please read the contributing guidelines and submit pull requests to the main repository.

examples/test_BQ25628E/test_BQ25628E.ino

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+/*!
+ * Test sketch for the Adafruit BQ25628E I2C Battery Charger library
+ * 
+ * Designed specifically to work with the Adafruit BQ25628E Breakout
+ * Pick one up today in the adafruit shop!
+ * 
+ * Author: Limor 'ladyada' Fried with assistance from Claude Code
+ * License: MIT
+ */
+
+#include "Adafruit_BQ25628E.h"
+
+Adafruit_BQ25628E bq;
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) delay(10);
+  
+  Serial.println("Adafruit BQ25628E Test!");
+  
+  if (!bq.begin()) {
+    Serial.println("Failed to find BQ25628E chip");
+    while (1) delay(10);
+  }
+  
+  Serial.println("BQ25628E Found!");
+}
+
+void loop() {
+  delay(1000);
+}