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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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STMicroelectronics Launches Two-in-One Activity Tracking/Bone Conduction Sensor to Save Space and Power in Earphones and Headphones
Longer battery life, excellent sound quality, the se...[Details]
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The main purpose of this experiment was to make a two-tone doorbell that could make a "ding dong" sound. In the end, although the circuit board was soldered and the components were assembled, it still...[Details]
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Analysts say Huawei’s 5G business is likely to slow this year as it pushes further into software, while hoping the impact of U.S. sanctions on its smartphone business eases. They say restricted ac...[Details]
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1. UCOSIII storage management 1.1 Storage Management As an RTOS operating system, memory management is an essential system module, so UCOSIII also has memory management capabilities. Usually, applica...[Details]
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Automakers need to explore new ways to differentiate themselves. One of the highlights is the new features inside the car. Now, new automotive-grade 3D time-of-flight (ToF) cameras are nearly as smal...[Details]
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Preface
When the industrial control system is running, it will usually encounter various on-site interferences. Anti-interference ability is an important indicator to measure the performance of the...[Details]
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1 Introduction Traditional CAN uses event-triggered message transmission mechanism, CSMA/CD+AMP (Carrier-Sense Multiple Access with Collision Detection and Arbitration on Message Prioriti...[Details]
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1.
LED chip
Inspection
Microscopic examination: whether there is mechanical damage and pitting on the surface of the material (lockhill chip size and electrode size meet the process re...[Details]
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introduction
However, with the rapid expansion of the video surveillance market, some of the shortcomings of the current video surveillance systems on the market have gradually emerged, includ...[Details]
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AD conversion D conversion is analog-to-digital conversion. As the name suggests, it converts analog signals into digital signals. It mainly includes integral type, successive approximation type,...[Details]
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Abstract:
Based on a brief analysis of the automation technology characteristics of high-speed screw filling machines, this article focuses on introducing the overall automation platform integrat...[Details]
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The pic16f876 stack has only 8 levels. Each time a subroutine call (or interrupt) occurs, the current 13-bit address is pushed onto the stack, PC = the lower 8 bits of the subroutine start address + P...[Details]
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This year, OnePlus launched the OnePlus Nord, the brand's first mid-range smartphone since the OnePlus X in 2015, but the latest news confirms that this product will not be sold in mainland China. H...[Details]
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Design a circuit for measuring temperature with a Pt100 platinum resistor. The temperature measurement range is 0-100 degrees Celsius and LCD display is required. Draw a circuit diagram, mark the par...[Details]