A vehicle built-in TF map data updating circuit and method

Abstract

The invention discloses a vehicle-mounted built-in TF map data updating circuit and method. The method comprises: receiving a navigation map data updating instruction triggered by a liquid crystal display screen, controlling the liquid crystal display screen to pop up a password input window to receive password input; determining whether password entry is correct, if the entered password is correct, a general I / O port of the CPU microprocessor is controlled to output a high level; the interiors of the first high-speed USB analog switch and the second high-speed USB analog switch are simultaneously switched to a USB data end to be communicated with a second multiplexing source input end; wherein the TF card interface circuit is directly switched to the USB interface to wait for being connected with a user terminal for map upgrading, and if the input password is wrong, the GPIO0 of the CPU microprocessor is kept in a low-level state, and the first high-speed USB analog switch and the second high-speed USB analog switch are kept in a default state. The method can be applied to equipment with a vehicle-mounted navigation display screen with a built-in TF map card, and has the advantages of low cost, convenience for updating vehicle-mounted navigation map data at any time and the like.

Description

technical field [0001] The invention relates to the technical field of vehicle navigation screen control, in particular to a vehicle built-in TF map data updating circuit. Background technique [0002] With the development of automotive electronics, multimedia navigation screens are increasingly used in vehicles. The multimedia navigation screen generally supports TF card, has navigation function and entertainment function of USB audio and video playback. Therefore, in the product design process of the multimedia navigation screen, in order to store navigation data and audio and video data separately, the device will be equipped with two TF cards, one for storing navigation data and one for storing audio and video sources. The navigation screen terminal device is affected by various factors such as structural limitations and easy to distinguish. Generally, the TF card for storing navigation data is built into the device or the back end of the device, and the TF card for sto...

AI Technical Summary

Problems solved by technology

For the convenience of map update, the existing equipment generally digs a hole near the built-in TF card during structural design and locks it with a cover or directly reserves a TF card hole. When the map needs to be updated, remove the cover , dial out the TF card to upgrade the map, which is inconvenient to use and affects the appearance of the device, and this method also has disadvantages for the protection of map data. For non-professionals, unplug the TF at will Data copying or other use, resulting in the navigation map not working properly, etc.

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