Method for transmitting data through USB interface on mobile phone

Abstract

The invention discloses a method for transmitting data on a cell phone through a USB interface, the method comprises first, establishing a static-state global sending queue and a static-state global sending queue, second, if data are sent from the USB interface, and placing a data packet which wants to be sent in the sending queue and sending in turn, third, if data are received from the USB interface, and then placing the data packets which are received in the receiving queue in turn, checking whether the receiving queue contains data packets, if contains, and then taking out data packets from the queue and relatively processing. Time occupying for sending or receiving function is shorter through adopting the invention, and the invention greatly improves the utilization ration of CPU, which fastens the speed of data processing, improves real-time performance of data transmission and increases data throughput, and the invention utilizes a static-state global queue to be a data buffer area, which not only solves the circumstance that when speed between USB equipment and a USB host machine is not matched, packet losing happens, but also memory fragments can not be generated.

Description

technical field [0001] The invention relates to a data transmission technology of a mobile terminal, in particular to a method for transmitting data through a USB interface on a mobile phone. Background technique [0002] With the popularity of a large number of computers supporting USB (Universal Serial Bus, Universal Serial Bus), USB has gradually become a standard interface for PCs. On the host (host) side, almost 100% of the latest PCs support USB; and on the device (device) side, devices using USB interfaces are also increasing day by day, such as digital cameras, scanners, joysticks, tapes and floppy drives, image devices , printer, keyboard, mouse, etc. [0003] As a small portable digital device, the mobile phone has the advantages of easy portability and powerful functions, but its storage capacity is not large enough, and it often needs to be connected with a USB host such as a computer through a data transmission interface to realize uploading and downloading, da...

AI Technical Summary

Problems solved by technology

[0005] 1. Data processing and data transmission cannot be performed in parallel

[0006] 2. When the bandwidth of the USB bus is insufficient or the host does not start a data packet transmission, calling the send or receive function will last for a long time

[0007] 3. When the transmission frequency is high, the continuous dynamic allocation of memory is prone to memory fragmentation, which affects the transmission efficiency

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