Audio via VSI

Audio file streaming interface. More...

Content
	Audio Driver API Functions
	Audio Driver API functions.
	Audio Driver API Defines
	Audio Driver API Definitions.

Data Structures
struct	AudioDrv_Status_t
	Audio Status. More...

Description

Audio file streaming interface.

Audio streaming use case is implemented for Arm FVPs based on the general-purpose Virtual Streaming Interface (VSI).

The use of common audio driver API simplifies re-targeting of the application code between virtual and physical devices. Currently audio driver implementations and examples are available for the following platforms:

• Arm FVPs using VSI with an interface to a Python test script that streams local *.wav file.
• NXP IMXRT1064 and IMXRT1050 evaluation boards that use microphone for audio input.

and support for other hardware platforms can be added following the same concept.

Micro Speech Example project demonstrates use of this audio driver in both the AVH test environment and on the physical evaluation boards.

The table below references the files that implement the audio peripheral:

Item	Description
./interface/audio/include/audio_drv.h	Audio Driver API header file. Used by implementations on Arm Virtual Hardware and real HW boards.
./interface/audio/driver/audio_drv.c	Audio driver implementation for Arm Virtual Hardware based on VSI
./interface/audio/python/arm_vsi0.py	Audio via VSI Python script for audio input interface based on VSI Python interface
./interface/audio/python/arm_vsi1.py	Audio via VSI Python script for audio output interface based on VSI Python interface
Audio driver for NXP IMXRT1050-EVKB board	Audio driver implementation for NXP IMXRT1050-EVKB. See AVH-TFLmicrospeech GitHub repo
Audio driver for NXP MIMXRT1064-EVK board	Audio driver implementation for NXP MIMXRT1064-EVK. See AVH-TFLmicrospeech GitHub repo

---

Data Structure Documentation

AudioDrv_Status_t

struct AudioDrv_Status_t

Audio Status.

Structure with information about the status of the Audio driver. The data fields encode busy flags and error flags.

Returned by:

• AudioDrv_GetStatus

Data Fields
uint32_t	tx_active: 1	Transmitter active.
uint32_t	rx_active: 1	Receiver active.
uint32_t	reserved: 30