CN109815177B - Vehicle-mounted built-in TF map data updating circuit and method - Google Patents
Vehicle-mounted built-in TF map data updating circuit and method Download PDFInfo
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- CN109815177B CN109815177B CN201711159691.XA CN201711159691A CN109815177B CN 109815177 B CN109815177 B CN 109815177B CN 201711159691 A CN201711159691 A CN 201711159691A CN 109815177 B CN109815177 B CN 109815177B
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Abstract
The invention discloses a vehicle-mounted built-in TF map data updating circuit and a method, which comprises the steps of receiving a navigation map data updating instruction triggered by a liquid crystal display screen, and controlling a password input window to pop up on the liquid crystal display screen to receive password input; judging whether the password input is correct, if the password input is correct, controlling a general I/O port of a CPU microprocessor to output a high level, and simultaneously switching the interiors of a first high-speed USB analog switch and a second high-speed USB analog switch to a USB data end to be communicated with a second multiplexing source input end, so that a TF card interface circuit is directly switched to a USB interface, and waiting for a user terminal to be connected for map upgrading; if the password is input incorrectly, 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 navigation display screen with a built-in TF map card, and has the advantages of low cost, convenience in updating vehicle navigation map data at any time and the like.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted navigation screen control, in particular to a vehicle-mounted built-in TF map data updating circuit.
Background
With the development of automotive electronics, multimedia navigation screens are more and more widely applied to vehicles. The multimedia navigation screen generally supports a TF card and has a navigation function and an entertainment function of USB audio and video playing. Therefore, in the product design process of the multimedia navigation screen, in order to store the navigation data and the audio and video data separately, the equipment is provided with two TF cards, one TF card is used for storing the navigation data, and the other TF card is used for storing the audio and video source. Because the navigation screen terminal equipment is influenced by various factors such as structural limitation, convenience in distinguishing and the like, a TF card for storing navigation data is generally arranged in the equipment or at the rear end of the equipment, and the TF card for storing audio and video is arranged on a front panel. Because the navigation electronic map needs to be updated frequently, the map data of the navigation screen also needs to be updated synchronously. In order to facilitate map updating, in the conventional device, a hole is generally dug near a built-in TF card during structural design, and the hole is locked by a cover or is directly reserved with a TF card hole. In order to solve the problems, a circuit and a method for updating the map data of the in-vehicle built-in TF are needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a vehicle-mounted built-in TF map data updating circuit and a vehicle-mounted built-in TF map data updating method. The circuit and the method can be applied to equipment with a vehicle navigation display screen with a built-in TF map card, are used for updating navigation map data of the built-in TF map card, and have the advantages of low cost, convenience in updating the vehicle navigation map data at any time and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an in-vehicle built-in TF map data update circuit, comprising:
the HUB chip is used for supporting and expanding multiple paths of USB and comprises one path of SDIO interface;
the TF card interface circuit is used for storing navigation map data and is connected with the HUB chip through an SDIO interface;
the USB interface is connected with the user terminal to receive the navigation map data to be updated;
the USB data end of the first high-speed USB analog switch is connected with the USB data end of the USB interface; a first multiplexing source input end of the first high-speed USB analog switch is connected with one path of USB input interface end of the HUB chip;
the USB data end of the second high-speed USB analog switch is connected with the USB output interface end of the HUB chip; the second multiplexing source input end of the second high-speed USB analog switch is connected with the second multiplexing source input end of the first high-speed USB analog switch;
the CPU microprocessor is used for processing the navigation map data; the data end of the USB HOST interface of the CPU microprocessor is connected with the first multiplexing source input end of the second high-speed USB analog switch; and a general I/O port of the CPU microprocessor is respectively connected with the input selection end of the first high-speed USB analog switch and the input selection end of the second high-speed USB analog switch, and is grounded through a pull-down resistor so as to control the high and low states of the input selection end of the first high-speed USB analog switch and the input selection end of the second high-speed USB analog switch.
Preferably, the mobile phone further comprises a liquid crystal display screen with a touch function, and the liquid crystal display screen is communicated with the CPU microprocessor through the I2C to realize touch control and navigation display.
Preferably, the CPU microprocessor includes a password control module, configured to receive a navigation map data update instruction triggered by the liquid crystal display, and control a password input window to pop up on the liquid crystal display to receive password input; and judging whether the input password is correct or not, if so, controlling a general I/O port of the CPU microprocessor to output a high level, otherwise, keeping the general I/O port of the CPU microprocessor in an original state.
Preferably, when the general I/O port outputs a low level, the USB data terminal of the first high-speed USB analog switch is communicated with the first multiplexing source input terminal thereof; when the general I/O port outputs a low level and a high level, the USB data end of the first high-speed USB analog switch is communicated with the second multiplexing source input end thereof.
Preferably, when the general I/O port outputs a low level, the USB data terminal of the second high-speed USB analog switch is communicated with the first multiplexing source input terminal thereof; when the general I/O port outputs high level, the USB data end of the second high-speed USB analog switch is communicated with the second multiplexing source input end thereof.
Preferably, the HUB chip is a USB2.0 HUB chip; the USB interface is a USB2.0 interface; the first high-speed USB analog switch and the second high-speed USB analog switch are both high-speed USB2.0 analog switches.
Preferably, the USB interface is connected to the user terminal through a USB data line.
A vehicle-mounted built-in TF map data updating method comprises the following steps:
receiving a navigation map data updating instruction triggered by a liquid crystal display screen, and controlling a password input window to pop up on the liquid crystal display screen to receive password input; judging whether the password input is correct, if the password input is correct, controlling a general I/O port of a CPU microprocessor to output a high level, and simultaneously switching the interiors of a first high-speed USB analog switch and a second high-speed USB analog switch to a USB data end to be communicated with a second multiplexing source input end, so that a TF card interface circuit is directly switched to a USB interface, and waiting for a user terminal to be connected for map upgrading; if the password is input incorrectly, the GPIO0 of the CPU microprocessor is kept in a low level state, the first high-speed USB analog switch and the second high-speed USB analog switch are not actuated, and a default state is kept.
Preferably, if the password input error is judged to be an error in inputting the password three times continuously, the input is prohibited, and the input is prompted to be re-input after a specified time after a certain time, or the navigation map data update is prompted to be cancelled.
Preferably, if the input password is correct, the user terminal is prompted to update the navigation map data.
The technical scheme provided by the invention has the beneficial effects that:
(1) the invention has low circuit cost and convenient application, is convenient for updating the vehicle navigation map data at any time, is suitable for equipment with a vehicle navigation display screen internally provided with a TF map card, and is used for updating the navigation map data of the built-in TF map card;
(2) according to the invention, one USB interface has an audio and video entertainment playing function and a TF map data updating function according to the expansion function characteristics of the USB HUB interface, and the USB interface is used as the audio and video entertainment playing function in a default state;
(3) the invention adopts I/O port high-low level control, the circuit is simple, the cost is low;
(4) the invention adopts two high-speed USB analog switches to realize automatic control switching of USB signals without influencing normal USB communication;
(5) the invention uses the software to set the password control mode, sets the authority for updating the map data, and prevents the map data from being damaged randomly; meanwhile, the mobile terminal has a man-machine interaction function, and in practical application, the mobile terminal only needs to bring a user terminal (such as a notebook computer) and a USB data line to directly carry out map data upgrade on a vehicle, so that the trouble of TF disassembly is reduced.
The present invention will be described in further detail with reference to the accompanying drawings and embodiments, but the in-vehicle TF map data updating circuit and method according to the present invention are not limited to the embodiments.
Drawings
FIG. 1 is a circuit diagram of a vehicle-mounted built-in TF map data update circuit according to the present embodiment;
FIG. 2 is a flowchart of the method of the present embodiment;
fig. 3 is a diagram of a password control interface according to the present embodiment.
Detailed Description
Referring to fig. 1, in the present embodiment, an in-vehicle TF map data updating circuit includes:
the HUB chip U1 is used for supporting and expanding multiple paths of USB and comprises a USB input interface, a USB output interface and an SDIO interface; the one path of USB input interface comprises a USB positive signal input interface DP1 and a USB negative signal input interface DM 1; the USB output interface comprises a positive signal output interface DP and a negative signal output interface DM;
the TF card interface circuit U2 is used for storing navigation map data and is connected with the HUB chip U1 through an SDIO interface;
the USB interface U3 on the navigation screen panel is connected with a user terminal (a notebook computer, a PC, a handheld device and the like) to receive the navigation map data to be updated; the USB data interface comprises a USB data positive signal interface DP and a USB data negative signal interface DM; the default state is used for playing the entertainment audios and videos, such as playing of MP3 and MP 5;
the USB interface circuit comprises a first high-speed USB analog switch U4, wherein the USB data end of the first high-speed USB analog switch U4 is connected with the USB data end of the USB interface U3; a first multiplexing source input end of the first high-speed USB analog switch U4 is connected to one USB input interface end of the HUB chip U1; the USB data end of the first high-speed USB analog switch U4 comprises a positive signal interface D + and a negative signal interface D-; the first multiplexing source input end of the first high-speed USB analog switch U4 comprises a positive signal interface D1+ and a negative signal interface D1-; the second multiplexed source input of the first high speed USB analog switch U4 includes a positive signal interface D2+ and a negative signal interface D2-.
A second high-speed USB analog switch U5, a USB data terminal of the second high-speed USB analog switch U5 being connected to a USB output interface terminal of the HUB chip U1; a second multiplexing source input end of the second high-speed USB analog switch U5 is connected with a second multiplexing source input end of the first high-speed USB analog switch U4; the second high-speed USB analog switch U5 can be selected from the same high-speed USB analog switch as the first high-speed USB analog switch U4; the USB data end of the second high-speed USB analog switch U5 comprises a positive signal interface D + and a negative signal interface D-; the first multiplexing source input end of the second high-speed USB analog switch U5 comprises a positive signal interface D1+ and a negative signal interface D1-; the second multiplexing source input end of the second high-speed USB analog switch U5 comprises a positive signal interface D2+ and a negative signal interface D2-;
the CPU 6 is used for processing the navigation map data and has the functions of audio and video decoding, navigation and the like; the data end of the CPU microprocessor U6USB HOST interface is connected with the first multiplexing source input end of the second high-speed USB analog switch U5; the general purpose I/O port GPIO0 of the CPU microprocessor U6 is connected to the input select terminal S of the first high speed USB analog switch U4 and the input select terminal S of the second high speed USB analog switch U5, respectively, and is grounded through a pull-down resistor R1 to control the high-low state of the input select terminal S of the first high speed USB analog switch U4 and the input select terminal S of the second high speed USB analog switch U5.
Further, the vehicle-mounted built-in TF map data updating circuit further comprises a liquid crystal display screen U7 which comprises a capacitive touch screen, and signals decoded by the CPU microprocessor U6 are sent to the liquid crystal display screen for display through RGB (888) signals; the capacitive touch screen is in I2C communication with a CPU microprocessor U6, touch control and navigation display are achieved, and the purpose of man-machine interaction is achieved.
Further, the CPU microprocessor U6 includes a password control module, configured to receive a navigation map data update command triggered by the liquid crystal display U7, and control the pop-up password input window on the liquid crystal display U7 to receive password input; and judging whether the input password is correct or not, if so, controlling a general purpose input/output (GPIO) port 0 of the CPU microprocessor U6 to output a high level, otherwise, keeping the general purpose input/output (GPIO) port 0 of the CPU microprocessor U6 in an original state. In this embodiment, the navigation screen terminal device adopts an android operating system in actual application. Referring to fig. 3, in the application of the actual android platform, password control can be implemented according to the following steps: firstly, designing a password input box interface, wherein the interface comprises a password input area, a determination key and a cancel key; secondly, using a control EditView in a PASSWORD input area, and inputting a text type of 'PASSWORD'; setting the password character String again; then, the user clicks a confirmation key after inputting the password; finally, comparing the password character string input by the user with the password character string, if the password character string input by the user is the same as the password character string, calling a GPIO driver by the application, controlling the GPIO0 to be pulled up by the CPU microprocessor U6, and calling a Toast interface to play a frame, namely 'please connect a notebook computer to perform map upgrade'; if the password input is different, calling a Toast interface to play a box, wherein the password input is wrong and the password input is required to be input again, and if the password input is wrong for three times, the input is suspended, and the password input is input after 5 minutes of reminding. The actual effect of the password input interface in the application.
Further, when the general I/O port GPIO0 outputs a low level, the USB data terminal of the first high-speed USB analog switch U4 is connected to the first multiplexing source input terminal thereof; when the general I/O port GPIO0 outputs a low-high level, the USB data terminal of the first high-speed USB analog switch U4 is communicated with the second multiplexing source input terminal thereof.
Further, when the general I/O port GPIO0 outputs a low level, the USB data terminal of the second high-speed USB analog switch U5 is connected to the first multiplexing source input terminal thereof; when the general purpose I/O port GPIO0 outputs a high level, the USB data terminal of the second high-speed USB analog switch U5 is connected to the second multiplexing source input terminal thereof.
Further, the HUB chip U1 is a USB2.0 HUB chip U1; the USB interface U3 is a USB2.0 interface; the first high-speed USB analog switch U4 and the second high-speed USB analog switch U5 are both high-speed USB2.0 analog switches. Specifically, the HUB chip U1 can be an AU6353 chip; the first high-speed USB analog switch U4 and the second high-speed USB analog switch U5 can be selected from FSUSB23USB2.0 analog switches.
Further, the USB interface U3 is connected to the user terminal through a USB data line.
In this embodiment, the navigation screen terminal device further includes a TF interface circuit (actually, the TF is located on the display screen panel), not shown, for storing audio and video sources, and is mainly used for playing an entertainment function and upgrading internal system software of the device itself.
Referring to fig. 2, a method for updating map data of a vehicle-mounted built-in TF includes:
when the navigation map data is not required to be updated, the GPIO0 of the CPU microprocessor U6 is kept in a low state, the first high-speed USB analog switch U4 and the second high-speed USB analog switch U5 are kept in default states (the default states in the first high-speed USB analog switch U4 are that D + is connected with D1+ and D-is connected with D1-), and the default states in the second high-speed USB analog switch U5 are that D + is connected with D1+ and D-is connected with D1-), so that the USB interface U3 and the TF card interface circuit U2 are normally connected with the CPU microprocessor U6 through the HUB chip U1, the first high-speed USB analog switch U4 and the second high-speed USB analog switch U5, and the navigation map display and the audio and video playing functions are realized simultaneously;
when the navigation map data needs to be updated, the simulated button of the liquid crystal display screen U7 is clicked, a special input window (an actual operation effect graph under an android platform, as shown in FIG. 3) is popped up, a password is input (as shown in 123456), and the CPU microprocessor U6 judges whether the password is correct or not. If the map updating is correct, the CPU microprocessor U6 controls the GPIO0 to be in a high-level state, the interiors of the first high-speed USB analog switch U4 and the second high-speed USB analog switch U5 are simultaneously switched to a second channel (the interior state of the first high-speed USB analog switch U4 is changed into that D + is connected with D2+ and D-is connected with D2-, and the interior state of the second high-speed USB analog switch U5 is changed into that D + is connected with D2+ and D-is connected with D2-), so that the TF card interface circuit U2 is directly switched to the external USB interface U3, and meanwhile, the liquid crystal display U7 displays a prompt, map data updating can be carried out, and a notebook computer is prompted to be connected for map updating. If the password is wrong, the GPIO0 of the CPU microprocessor U6 is kept in a low level state, the first high-speed USB analog switch U4 and the second high-speed USB analog switch U5 do not act, the default state is kept, and meanwhile, the liquid crystal display U7 displays the password error and requests to input the password again. And if the operation is wrong for three times, input is suspended, the input is performed after 5 minutes of reminding, or the map updating and upgrading are selected to be cancelled.
The principle of the vehicle-mounted built-in TF map data updating circuit and method is as follows:
according to the expansion function characteristics of the USB HUB interface, a software set password control technology, an I/O (input/output) interface control technology and a high-speed analog switch control technology are applied, when map data are needed to be updated, an analog key of a liquid crystal display U7 is clicked, a special input window is popped up, a password is input, a CPU microprocessor U6 judges whether the password is correct, if the password is correct, the CPU microprocessor U6 controls a GPIO0 to be in a high-level state, so that a first high-speed USB analog switch U4 and a second high-speed USB analog switch U5 act simultaneously, a TF card interface circuit U2 is connected with an external USB interface U3, at the moment, a user terminal is connected with the USB interface U3 through a USB wire harness, and the TF card can be updated with navigation map data.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An in-vehicle built-in TF map data update circuit, comprising:
the HUB chip is used for supporting and expanding multiple paths of USB and comprises one path of SDIO interface;
the TF card interface circuit is used for storing navigation map data and is connected with the HUB chip through an SDIO interface;
the USB interface is connected with the user terminal to receive the navigation map data to be updated;
the USB data end of the first high-speed USB analog switch is connected with the USB data end of the USB interface; a first multiplexing source input end of the first high-speed USB analog switch is connected with one path of USB input interface end of the HUB chip;
the USB data end of the second high-speed USB analog switch is connected with the USB output interface end of the HUB chip; the second multiplexing source input end of the second high-speed USB analog switch is connected with the second multiplexing source input end of the first high-speed USB analog switch;
the CPU microprocessor is used for processing the navigation map data; the data end of the USB HOST interface of the CPU microprocessor is connected with the first multiplexing source input end of the second high-speed USB analog switch; and a general I/O port of the CPU microprocessor is respectively connected with the input selection end of the first high-speed USB analog switch and the input selection end of the second high-speed USB analog switch, and is grounded through a pull-down resistor so as to control the high and low states of the input selection end of the first high-speed USB analog switch and the input selection end of the second high-speed USB analog switch.
2. The vehicular built-in TF map data update circuit according to claim 1, further comprising a liquid crystal display with touch function, said liquid crystal display communicating with said CPU microprocessor through I2C for touch control and navigation display.
3. The vehicle-mounted built-in TF map data updating circuit according to claim 2, wherein the CPU microprocessor comprises a password control module, and is used for receiving a navigation map data updating instruction triggered by the liquid crystal display screen and controlling a password input window to pop up on the liquid crystal display screen to receive password input; and judging whether the input password is correct or not, if so, controlling a general I/O port of the CPU microprocessor to output a high level, otherwise, keeping the general I/O port of the CPU microprocessor in an original state.
4. The vehicle-mounted built-in TF map data updating circuit according to claim 1, wherein when the general I/O port outputs a low level, a USB data terminal of the first high-speed USB analog switch is communicated with a first multiplexing source input terminal thereof; when the general I/O port outputs a low level and a high level, the USB data end of the first high-speed USB analog switch is communicated with the second multiplexing source input end thereof.
5. The vehicle-mounted built-in TF map data updating circuit according to claim 1, wherein when the general I/O port outputs a low level, the USB data terminal of the second high-speed USB analog switch is communicated with the first multiplexing source input terminal thereof; when the general I/O port outputs high level, the USB data end of the second high-speed USB analog switch is communicated with the second multiplexing source input end thereof.
6. The vehicle-mounted built-in TF map data updating circuit according to claim 1, wherein the HUB chip is a USB2.0 HUB chip; the USB interface is a USB2.0 interface; the first high-speed USB analog switch and the second high-speed USB analog switch are both high-speed USB2.0 analog switches.
7. The in-vehicle TF map data updating circuit according to claim 1, wherein the USB interface is connected to the user terminal through a USB data line.
8. An onboard TF map data updating method, which is executed on the structure of an onboard TF map data updating circuit according to any one of claims 1 to 7, comprising:
receiving a navigation map data updating instruction triggered by a liquid crystal display screen, and controlling a password input window to pop up on the liquid crystal display screen to receive password input; judging whether the password input is correct, if the password input is correct, controlling a general I/O port of a CPU microprocessor to output a high level, and simultaneously switching the interiors of a first high-speed USB analog switch and a second high-speed USB analog switch to a USB data end to be communicated with a second multiplexing source input end, so that a TF card interface circuit is directly switched to a USB interface, and waiting for a user terminal to be connected for map upgrading; if the password is input incorrectly, the GPIO0 of the CPU microprocessor is kept in a low level state, the first high-speed USB analog switch and the second high-speed USB analog switch are not actuated, and a default state is kept.
9. The in-vehicle built-in TF map data updating method according to claim 8, wherein if three consecutive password input errors are determined as a password input error, and input is prohibited, re-input after a specified time after a certain time is prompted, or cancellation of navigation map data updating is prompted.
10. The on-vehicle built-in TF map data updating method according to claim 8, wherein if the password is inputted correctly, the connected user terminal is prompted to update the navigation map data.
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