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Vehicle-mounted data transmission method and device

A vehicle-mounted data and transmission method technology, which is applied in the field of vehicle-mounted data transmission and vehicle-mounted data transmission devices, can solve problems such as inability to obtain, fail to fill buffers in time, state disorder, etc., to solve unstable transmission and solve the mutual influence between display and transmission , the effect of not affecting the stability of each other

Pending Publication Date: 2021-03-12
GUANGZHOU CHENGXING ZHIDONG AUTOMOTIVE TECH CO LTD +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vice versa, when the underlying hardware has a problem, the buffer cannot be filled in time, and the upper layer cannot obtain the prepared buffer, which will lead to state disorder or even crash (downtime) problems

Method used

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  • Vehicle-mounted data transmission method and device
  • Vehicle-mounted data transmission method and device

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Embodiment Construction

[0037] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] refer to figure 1 , showing a schematic diagram of an example of an existing vehicle data transmission method; the specific execution process is as follows:

[0039] First, in the buffer managed by the HAL (Hardware Abstraction Layer, hardware abstraction layer) process, apply for the local window buffer nativewindow buffer. After the application is successful, the nativewindow buffer is in a state to be filled; at this time, the map (map) enters the kernel (kernel) space.

[0040] Waiting for the data of the hardware device DMA (Direct Memory Access, direct memory access) to be filled; wherein, the hardware device DMA enables the data on the hardware device to be transmitted without going through the CPU.

[0041] After ...

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Abstract

The embodiment of the invention provides a vehicle-mounted data transmission method and device, which are applied to a vehicle-mounted system, a direct memory access DMA is deployed on the vehicle-mounted system, the DMA is used for receiving vehicle-mounted data, and the method comprises the following steps that: a hardware abstraction layer HAL process fills the vehicle-mounted data received bythe DMA into a preset first buffer area; copying the filled vehicle-mounted data in the first buffer area to a preset second transmission buffer area by the copying function; and the HAL process callsthe preset second transmission buffer area to transmit the vehicle-mounted data to a display buffer area. According to the embodiment of the invention, double buffer areas are adopted for transmission, so that the problems of unstable vehicle-mounted image data transmission and mutual influence between display and transmission can be effectively solved.

Description

technical field [0001] The present invention relates to the field of on-vehicle technology, in particular to an on-vehicle data transmission method and an on-vehicle data transmission device. Background technique [0002] With the development of vehicles, the scenes where users view in-vehicle images are gradually increasing, and the requirements for the stability of in-vehicle data transmission are also gradually increasing. [0003] In the prior art, a single-cycle buffer (buffer) is used. Use it from top to bottom, return it to the bottom layer after use, and recycle. This solution will not cause problems in electronic equipment, but in the vehicle system, due to the extremely long transmission line and the bumps and vibrations in the actual operation process, the transmission link will always have some instability. However, this single-loop system transmission is unstable, and the upper layer display and the lower layer transmission affect each other. Because the uppe...

Claims

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Application Information

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IPC IPC(8): H04L29/08H04L12/883G06F13/28H04L49/9015
CPCH04L67/12H04L49/9021H04L67/1095G06F13/28
Inventor 王保磊
Owner GUANGZHOU CHENGXING ZHIDONG AUTOMOTIVE TECH CO LTD
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