Introduction

This document specifies the API for developing BLE Applications and other Applications.

GR551x provides three classes of APIs for developer:

• The BLE API to develop various BLE Applications using the BLE interfaces.

​ Please refer to Definitions and Prototypes for BLE SDK

• The Peripheral API to access the various peripherals of MCU.

​ Please refer to Definitions and Prototypes for Peripheral

• The System API to acquire and utilize system resources, such as software timer.

​ Please refer to Definitions and Prototypes for System API

Note: The latest API version number for SDK is 1.7.0.