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1. The process of calling the application when setting the volume
（1）strace分析： amixer cset numid=1 30 (设置音量)
/dev/snd/controlC0
open
SNDRV_CTL_IOCTL_CARD_INFO
SNDRV_CTL_IOCTL_P...[Details]
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The ZLED7022, one of our ZLED family of LED control ICs, is a low-noise, constant-frequency charge pump DC/DC converter that can drive up to six LED channels, providing a programmable constant current...[Details]
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In the second half of 2018, memory chip prices began to fall, sales also fluctuated, and memory companies' revenues declined significantly. In 2019, the revenue of Samsung Semiconductor, SK Hynix a...[Details]
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Introduction to I2C The I2C bus is a simple, bidirectional, two-wire synchronous serial bus developed by Philips. It only requires two wires to transmit information between devices connected to t...[Details]
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arm-linux-gcc -o only activates preprocessing, compilation, and assembly, that is, it only makes the program into an obj file -Wall specifies to generate all warning messages -O2 The compil...[Details]
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Some thoughts on infrared reception.
I am currently working on an infrared receiver and transmitter for a television. I have read some books, and the books say that the signal is modulated on a 38kh...[Details]
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As supply and demand conditions for automotive chips ease, an old ailment is returning to plague the supply chain. Even as automakers struggle to cope with various new technologies and technological ...[Details]
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An Apple software engineer has announced that iOS 15.5 will include the reintroduction of the popular Apple Music API, which is used by third-party music players to allow users to change the playba...[Details]
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ATmega48/88/168 contains 256/512/512 bytes of EEPROM data memory. It is used as a separate data EEPROM with a life of at least 100,000 erase cycles. EEPROM access is determined by the address registe...[Details]
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Passive current sharing is a method of connecting two or more power supplies or DC-DC converters in parallel so that they can share the load approximately evenly. This method is popular because it ...[Details]
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With the development of science and technology, digital oscilloscopes are becoming more and more advanced, and waveform refresh rate has gradually become the fourth most important technical indicator ...[Details]
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Preface Spectrum analysis is a fast method to observe and measure signal amplitude and signal distortion. The display result can intuitively reflect the amplitude of the Fourier transform of the inp...[Details]
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Compiled from Semiengineering. Cadence's new CEO and Phil Kaufman Award winner Anirudh Devgan discussed with Semiengineer reporters the next steps in EDA, potential technical and business challenge...[Details]
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Due to the epidemic, many people in the communications industry regretted missing the annual MWC World Mobile Congress to communicate and share. To this end, from June 30 to July 2, 2020, the MWC tea...[Details]
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On October 24, 2024, WPG Holdings, a leading international semiconductor component distributor dedicated to the Asia-Pacific market,
announced that its subsidiary Youshang has launched a 30kW V...[Details]
Analogue and Mixed Signal
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