Method and device for optimizing virtual pointer of RH850 liquid crystal instrument

Abstract

The invention provides a method and a device for optimizing a virtual pointer of an RH850 liquid crystal instrument. The method comprises the following steps: creating a virtual pointer window and an instrument element window, wherein the virtual pointer window and the instrument element window are both double-buffer windows; in each VSync period, describing a virtual pointer in the virtual pointer window through the GPU, and describing instrument elements with a preset proportion in the instrument element window. Compared with the prior art, the method has the advantages that on the premise that external Flash consumption is not increased, the frame rate of other instrument element pictures except the virtual pointer is reduced in a layered dynamic GPU resource allocation mode, and it can be guaranteed that the frame rate of the virtual pointer of the RH850 liquid crystal instrument is always stably kept about 60 fps. The refresh rate of the virtual pointer of the RH850 liquid crystal instrument is effectively ensured under the condition of limited GPU operational capability.

Description

technical field [0001] The invention relates to the field of vehicle-mounted liquid crystal meters, in particular to a method and device for optimizing a virtual pointer of an RH850 liquid crystal meter. Background technique [0002] With the popularity of LCD instruments, more and more car users are pursuing LCD instrument panels. At present, the RH850D1Mx series can drive 3.5-10.25-inch LCD instruments, and can drive up to 1280*480 LCD instruments. The pointer information such as vehicle speed and rotational speed of the large-sized LCD instrument is displayed by the virtual pointer through the TFT screen. In order to meet the safety requirements of the car, the refresh rate of the virtual pointer is generally required to reach 60fps, otherwise the pointer delay will bring safety hazards to the user; The display frame rate of other instrument elements only needs to be kept at about 20fps, so that there is no obvious lag for the naked eye. However, the RH850 MCU is equippe...

AI Technical Summary

Problems solved by technology

Since the Sprite window can only use textures and cannot perform operations such as rotation and scaling, it is necessary to cut each rotation angle of the pointer into an independent picture and put it in the external Flash, which will cause a very large occupation of external Flash resources.

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