1, upstairs saidCSMA/CD, CSMA is the meaning of carrier monitoring, CD is collision detection, and the DA said by the floor has never heard, there is a CA, called collision avoidance, this will be encountered in wireless transmission. These are some rules, that is, protocols, that prevent data packets on the link from colliding when transmitting Ethernet data. Thank you, this is my
2, Ethernet designers designed a called CSMA (Carrier Sense Multiple Access, carrierListen for multiple access) protocol to try to avoid this. CSMA is listen before you transmit. If the line is heard to be idle, then the entire Frame is transmitted. If you hear that the line is busy, then delay the transmission time.
3, Ethernet adopts the method of shared channel, that is, multiple hosts share a channel for data transmission. In order to solve the problem of channel requirment of multiple computers, Ethernet adopts the CSMA/CD (carrier monitoring multiple access/collision detection) protocol stipulated by the IEEE803 standard, which is the cooperation of controlling multiple users to share a channelIs the output PWM to control it, do not know why you want to AD collection, and then DA output to where? If it is DA output to the motor, it is PWM output, originally done a collection AD signal, and then output PWM to the motor control speed project.
The duty of the DA converter is to convert a digital signal into an analog signal. According to the output form, DA converters are usually divided into current output type and voltage output type. Among them, the voltage output DAC is one of the most widely used types, and the STM32 series microcontrollers have built-in such voltage output DAC. At STM32 The number of DAC channels and functions in a system depends on the specific model. For example, the STM32F4 model is usually equipped with 1 to 3 channels.
ST Microcontroller 32-Bit STM3IntLib in ST Microelectronics. The DA of STM32 is the internal data value converted into analog voltage output by DA, and the AD is the external analog voltage converted into data value by the AD input port of STM32.
In the teaching stage, a good microphone is an important tool to improve the classroom effect. In the market, we found a number of highly rated brands, including SooLove, Nuowei, domestic veteran win, as well as the international brand Philips. Wireless version is undoubtedly the first choice of modern teachers, they are convenient and practical, but also easy to carry.
For teachers with high stability requirements, wired speakers are preferred. SONY Ericsson and Novy provide clear and stable sound quality for the classroom with their excellent cost performance. Their simple design and easy operation make them ideal for daily teaching. Wireless speakers If you're after wireless freedom, wireless speakers like Philips are a more modern solution.
Winning Bee loudspeaker for teachers is a good choice. The victorious Bee loudspeaker uses digital wireless technology and can be connected to mobile phones and other devices via Bluetooth for wireless transmission. It has a large battery capacity, stable and efficient sound quality, and an intuitive and easy-to-use button design, making it ideal for use as a small portable speaker. SONY Ericsson is a company with a good reputation in the field of electronic products, and its loudspeaker products are also favored by users.
1. This device does not support ottg function. The so-called otg workA USB flash drive can be read from a mobile phone or other electronic device. Such as storage devices. Overall, it works very well. However, Huawei's function does not support otg.
2, line connection with the mobile phone to OTG external adapter can be. In addition to line connections, some advanced devices require additional drivers. If the device driver does not support the phone's system, just connecting the line is useless.
3, recording function is a highlight of T10, support 8K/16K WAV format recording, recording through the built-in microphone, the maximum cumulative recording time can reach100 hours (1GB capacity). In addition, it is also equipped with OTG 0 function, can read U disk, solid state drive and mobile hard disk HD audio and video files, support a variety of subtitles formats, to meet the needs of the domestic market.
4, high-speed USB0 OTG supports seamless connection to hard disk drive (HDD) devices to store large amounts of data Further power reduction with SmartReflex technology Enhanced M-shield mobile security and OMAP with ARM TrustZone support 2 Processor software alsoHLOS support for customizable interface n95 is 500W pixels Yes, OMAP2420 can only manage up to 4 megapixel camera because no problem.