Open Hardware and ARM
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Designing open audio hardware as DIY kits
Previously in this series about people who are developing audio technology in the open, I interviewed Juan Rios, developer and maintainer of Guayadeque and Sander Jansen, developer and maintainer of Goggles Music Manager. These conversations have broadened my thinking and helped me enjoy their software even more than before.
For this article, I contacted Håvard Skrödahl, founder of Muffsy. His hobby is designing open source audio hardware, and he offers his designs as kits for those of us who can't wait to wind up the soldering iron for another adventure.
I've built two of Håvard's kits: a moving coil (MC) cartridge preamp and a moving magnet (MM) cartridge phono preamp. Both were a lot of fun to build and sound great. They were also a bit of a stroll down memory lane for me. In my 20s, I built some other audio kits, including a Hafler DH-200 power amplifier and a DH-110 preamplifier. Before that, I built a power amplifier using a Motorola circuit design; both the design and the amplifier were lost along the way, but they were a lot of fun!
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Nuvoton Launches Brand New M261/M262/M263 Series MCUs for IoT Applications
Low power and robust security are two major requirements for the Internet of Things (IoT) applications. In terms of low power consumption, NuMicro M261/M262/M263 series provides multiple power modes for different operating scenarios, integrating RTC with independent VBAT to support low power mode. The power consumption in normal run mode is 97 μA/MHz (LDO mode) and 45 μA/MHz (DC-DC mode). Standby power-down current is down to 2.8 μA and Deep power-down current is less than 2 μA. The low power, low supply voltage, and fast wake-up (9 μs from Fast-wakeup Power-down mode) features make M261/M262/M263 series suitable for battery-powered IoT applications.
The robust security functions of NuMicro M261/M262/M263 series include secure boot function to ensure that a device boots using only trusted software through a series of digital signature authentication processes. The M261/M262/M263 series integrates complete hardware crypto engines such as AES 256/192/128, DES/3-DES, SHA, ECC, and True Random Number Generator (TRNG). Furthermore, it provides 4-region programable eXecute-Only-Memory (XOM) to secure critical program codes and up to six tamper detection pins against outer physical attack, which significantly improves the product security.
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Third-Party IDEs such as Keil MDK, IAR EWARM, and NuEclipse IDE with GNU GCC compilers are also supported.
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Arm, WDC and Qualcomm Announce OpenChain Conformance Activities
Arm and Western Digital Corporation, Platinum Members of the OpenChain Project and key participants in the global supply chain, today announce conformance with the OpenChain Specification. Qualcomm Technologies, Inc., Platinum Member and founding contributor of the OpenChain Project, today announces expanded conformance to the latest version of the OpenChain Specification.
The OpenChain Project establishes trust in the open source from which software solutions are built. It accomplishes this by making open source license compliance simpler and more consistent. The OpenChain Specification defines inflection points in business workflows where a compliance process, policy or training should exist to minimize the potential for errors and maximize the efficiency of bringing solutions to market. The companies involved in the OpenChain community number in the hundreds. The OpenChain Specification is being prepared for submission to ISO and evolution from a growing de facto standard into a formal standard.
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