# Developer Guide

LinkIt 7697 provides Wi-Fi and Bluetooth 4.2 Low Energy connectivity, and supports various kinds of peripheral interfaces. These features can be accessed through the built-in Arduino core functions, or through the built-in library. For example, **LBLE** library is provided for accessing the Bluetooth Low Energy features.

Please the choose the topics below:

#### Peripheral <a href="#developerguide-peripheral" id="developerguide-peripheral"></a>

* [GPIO](/linkit-7697/linkit-7697-arduinoide/kai-fa-zhi-nan/gpio.md)
* [UART](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/uart.md)
* [ADC](/linkit-7697/linkit-7697-arduinoide/kai-fa-zhi-nan/adc.md)
* [EINT](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/external-interrupt.md)
* [I2C](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/i2c.md)
* [SPI](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/spi.md)
* [EEPROM](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/eeprom.md)
* [Timer](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/timer.md)
* [Flash (Key-Pair Storage)](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/flash-key-pair-storage.md)
* [RTC (Real-Time Clock)](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/rtc-real-time-clock.md)
* [Software Serial](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/software-serial.md)

#### Connectivity <a href="#developerguide-connectivity" id="developerguide-connectivity"></a>

* [Wi-Fi](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/using-the-wi-fi-library.md)
* [MCS](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/using-mcs-library.md)
* [Bluetooth](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/using-bluetooth.md)
* [LinkIt Remote](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/using-linkit-remote.md)

#### Hardware & Tools <a href="#developerguide-hardware-and-tools" id="developerguide-hardware-and-tools"></a>

* [Initial Pin State](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/initial-pin-state-of-linkit-7697.md)
* [Power Supply](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/powering-the-linkit-7697.md)
* [Bootloader and Firmware Update](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/update-bootloader-and-firmware.md)
* [Flash Uploading Tool](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/flash-uploading-tool.md)
* [FOTA Update](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/fota-update.md)

#### Troubleshooting <a href="#developerguide-troubleshooting" id="developerguide-troubleshooting"></a>

* [Limitations](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/limitations-of-linkit-7697.md)
* [Source Code of Arduino Package](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/source-code-of-arduino-package.md)
* [Issue report](/linkit-7697/linkit-7697-development-guide-for-arduino-ide/developer-guide/issue-report.md)


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