# Authentication of the Trillbit IA61x algorithm Every time that your application with Trillbit Host library is run, the following steps are to be followed: 1. Start by preparing the board drivers. 1. Driver initialisation and functioning must be handled by the customer application. 2. Initialize the Host SDK Method Call: trill\_host\_init() 1. Returns integer: 0 if License is correct and init was successful, else negative error code if init was unsuccessful. 2. This prepares the SDK to interact with the IA61x firmware. Download Trillbit IA61x firmware over UART. Start of external clock through UART. 3. Start of Voicewake mode (Refer to Knowles IA61x documentation). This waits for a keyword to be received. 4. The keyword that can be detected is defined at- < src/include/trill\_host.h > 5. Depending on the type of keyword received, the following steps are to be executed: 1. Authentication Needed: Authentication is pending. Data received from the SmartMic is to be read through UART and is to be passed to trill\_host\_handle\_auth() method. 2. Authentication Passed: The SDK is in continuous listening mode and is in data receive state. To safely deallocate the memory allocated, trill\_host*\_*deinit must be called. 3. If data is detected: Payload is read through RDB. **Note: Refer to Knowles documentation for more information on how RDB and VoiceWake Mode works.** --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://trillbit.gitbook.io/trillbit-sdk/knowles-smartmic-support/trill-sdk-for-knowles/setup-guide/authentication-of-the-trillbit-ia61x-algorithm.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.