The Advanced Linux Sound Architecture (ALSA) in the Linux operating system is a powerful audio driver framework that provides support for sound card hardware and allows user-space applications to process audio data.This article aims to provide beginners with a guide to learning ALSA sound card driver development from scratch, helping developers master the core knowledge … Read more
AbstractThis article provides an in-depth analysis of the core driver implementation mechanism of the Loopback sound card (simple, without involving low-level hardware drivers) from the perspective of character device driver development, based on the Linux kernel 6.8.0 and the QEMU simulation environment with AArch64 architecture. It focuses on the registration management of device nodes and … Read more
—————————————————————————————————————————- Development Board: NanoPC-T4 Development BoardeMMC: 16GBLPDDR3: 4GBDisplay: 15.6 inch HDMI Interface Displayu-boot: 2023.04Linux: 6.3—————————————————————————————————————————- The term “jack” literally refers to a socket. What is a socket? I understand it to be the socket for audio devices such as microphones and headphones. So what is the function of the jack device? Its main purpose is … Read more
—————————————————————————————————————————- Development Board: NanoPC-T4 Development BoardeMMC: 16GBLPDDR3: 4GBDisplay: 15.6-inch HDMI Interface Displayu-boot: 2023.04Linux: 6.3—————————————————————————————————————————- Control is an abstraction used in audio drivers to represent user-operable audio parameters or functions. It can be volume control, mixer control, switch control, etc. Control provides a unified interface that allows users to manage and adjust audio parameters through audio … Read more
—————————————————————————————————————————- Development Board: NanoPC-T4 Development BoardeMMC: 16GBLPDDR3: 4GBDisplay: 15.6 Inch HDMI Interface Displayu-boot: 2023.04Linux: 6.3—————————————————————————————————————————- The /proc directory on Linux systems is a type of file system, known as the proc file system. Unlike other common file systems, /proc is a pseudo file system (i.e., a virtual file system) that stores a series of special … Read more
Hello, it’s Lao Wu again sharing learning insights! Also, welcome everyone to join the Embedded Hacker WeChat group~ Just add me, and I’ll pull you in. Purpose: To gain a general understanding of RK3399 Audio functionality from the perspective of driver development. Environment: NanoPC-T4 / Ubuntu-18.04 / Linux-4.4 Table of Contents: 1. Test Functionality 2. … Read more
1. Linux Audio Architecture Diagram The quality of audio and video directly affects product experience. 2. Explanation of Audio Architecture Layers openWRT adopts the ALSA layer architecture as follows: Application: The upper layer application mainly calls the interfaces in alsa-lib to implement business logic. Use aplay, arecord, amixer, speaker-test in alsa-util for related testing. HAL … Read more