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Thursday, February 23 • 4:30pm - 5:20pm
Developing Audio Products with Cortex-M3/NuttX/C++11 - Masayuki Ishikawa, Sony

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Sony released some audio products with a Cortex-M3 processor core in late 2015. Considering development efficiency, code reusability, feature enhancements and training costs, we decided to use NuttX instead of Linux.  In this talk I will describe Sony's modifications to NuttX for our project.  This may give insights to Linux developers on the benefits and drawbacks of using a non-Linux OS for their own embedded projects.

NuttX is a POSIX-based open source RTOS. We ported NuttX to ON Semiconductor's LC823450 by ourselves, modified it for fast ELF loading, implemented minimum adb (Android debug bridge) protocols for testing purpose, and implemented DVFS in autonomous mode with a simple CPU idle calculation, and added wake_locks and stack trace which are popular in the Linux/Android worlds. Middleware and Applications were developed in C++11 with LLVM's libc++ which are also popular for large software systems. To debug the software, we implemented NuttX support for OpenOCD so that we can debug multi threaded applications with gdb. In addition, we used NuttX with QEMU (emulating the Cortex-M3) to port a bluetooth stack and in-house GUI toolkit and got them working before we received LC823450 FPGA.  This session should help attendees understand the tradeoffs involved in this project, and whether using a non-Linux OS is appropriate and worth the effort.


Speakers
avatar for Masayuki Ishikawa

Masayuki Ishikawa

Senior Software Engineer, Sony
At Sony Corporation, I was a design/implementation/team leader for 3D graphics software development in C++/VRML2.0/JAVA on Windows (1995-1998), home network software development with HAVi and streaming (HTTP/RTP) in C/C++/Java (1999-2002), XMPP-based internet-to-home software development both server side and client side with Apache/Tomcat/SOAP/XMPP in C/C++/Java on Linux (2003-2005) then I introduced embedded Linux to Sony Walkman products with... Read More →



Thursday February 23, 2017 4:30pm - 5:20pm
Skyline II
  • Experience Level Any

Attendees (28)