KR100404424B1 - Communication protocol for working a ATOM using in the automobile - Google Patents

Abstract

The present invention is to provide a communication protocol for vehicle ATOM operation suitable for enabling the real-time processing of various interface signals between the microcomputer and the CPU for more efficient operation of the vehicle ATOM (Automobile Telematics Office and Multimedia), the present invention The communication protocol for ATOM operation of a vehicle is a communication protocol between a microcomputer that is in charge of interfacing with various devices in a vehicle and a CPU that is in charge of system control for ATOM operation. A function code portion of a predetermined bit that is assigned to and represents a content of a function code corresponding to a key selected by the driver, and is assigned after the function code portion, and an allocation bit is changed according to the content of the function code and corresponds to the function code. Consisting of data parts representing data The communication data is bidirectionally communicated between the microcomputer and the CPU according to the contents of the function code.

Description

Communication protocol for operating a ATOM using vehicle {Communication protocol for working a ATOM using in the automobile}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication protocol, and more particularly, to a communication protocol for operating an automotive vehicle office and multimedia (ATOM).

The Internet, symbolized by the World Wide Web (WWW), has recently been in the spotlight, but the Internet is already promoting a new paradigm shift in human life in social, economic and political terms.

The development of information and communication technology, summarized with the word digital revolution, is causing a great change in the way of life of mankind, and the explosive spread and development of personal computers and the Internet are summed up in e-commerce and E-business. It is bringing innovative changes to human life from economic, cultural and political perspectives, such as changing business based on knowledge and information, revitalizing the cyber world through information sharing, and acting as a new media to replace the press and broadcasting.

Therefore, life without the Internet is hardly imagined as a part of life for the modern people, and even in the Internet, a new technology called wireless Internet has been developed beyond the wired Internet and the development of mobile communication technology.

In recent years, the mobile communication environment has been developing at a tremendous speed, starting with mobile pagers, through cellular handphones, personal mobile phones (PCS), and IMT2000-based mobile communications. In addition, the search for additional services available through the terminal has been actively developed.

As such, the widespread use of the Internet and the development of mobile communication technologies have shown the possibility of wireless terminals as a means of accessing the Internet anytime and anywhere beyond simple communication means.

In the same vein, the popularity of automobiles is rapidly increasing in combination with the civilization of civilization, and as automobiles are becoming a necessity of modern people, they are more efficient office spaces and rest spaces in automobiles than in the past. Research continues to expand the range of applications.

That is, vehicle telematics (Telecommunication and information processing) that can search and collect various information necessary for the driver by using modem and hands free function as a communication means for the Internet in a car. There is an urgent need to develop a compound word of information processing.

To define telematics in one word, the connection of GPS satellites and central information service centers with in-vehicle terminals, e-mail transmissions, weather information, stock information, traffic information, sports, MP3 downloads, etc. Of course, it refers to systems and information systems that enable rapid diagnosis of vehicle diagnosis, security services and accidents.

Such telematics, for example, quickly detects the location of an accident vehicle through a satellite and a wireless communication network and informs the nearest rescue team of an accident location and situation when an air bag bursts. Enable first aid and incident handling. In other words, if a signal indicating that the air bag is operated is detected by checking whether the air bag is operated, an emergency signal is transmitted to the information service center providing various information through a wireless communication network, and the information service center is able to locate the position of the vehicle sending the emergency signal. It tracks through satellite signals and attempts to talk to the driver of the accident vehicle through a wireless communication network, and then contacts hospitals, police stations, insurance companies, etc., which are required to handle the accident.

In addition, the telematics system can change the information provided by text to voice in order to prevent accidents, and the door can be opened by satellite even if the door is locked with the key in the car or the location information of nearby hotels, gas stations, restaurants, etc. You can search and make reservations.

In fact, in order to operate such a telematics system, a CPU in charge of processing satellite signals from a GPS satellite or a system control for using the wireless Internet, and a microcomputer in charge of various interfaces in a vehicle, such as diagnosis of a vehicle, are configured.

That is, the position information of the vehicle and the speed information according to the driving are provided to the information service center through the wireless communication network from the GPS satellite signal received through the GPS antenna under the control of the CPU, and the weather information and the stock information from the information service center. , Traffic and sports, and other Internet information, including MP3 downloads, are available to drivers on screen or by voice.

Under the control of the microcomputer, the vehicle automatically diagnoses, for example, whether the air bag is operated, the engine oil is replaced, the tire air pressure, the brake is operated.

However, the CPU not only manages the operating program for operating the system but also exchanges information with the information service center through the wireless Internet connection, so it can process the interface signals according to the various diagnosis of the vehicle under the control of the microcomputer in real time. I can't. In other words, although the various interface signals of the vehicle must be checked in real time and prompt action is taken accordingly, the CPU will continue to attempt to connect to the wireless Internet to exchange information with the information service center while driving the interface signals in the vehicle. It is impossible to process in real time.

The present invention has been made to solve the problem that the real-time processing of the in-vehicle interface signal generated in the telematic system as described above, between the microcomputer and the CPU for more efficient operation of the vehicle ATOM (Automobile Telematics Office and Multimedia) It is an object of the present invention to provide a communication protocol for proper operation of a vehicle ATOM for processing various interface signals in real time.

The communication protocol for the vehicle ATOM operation of the present invention for achieving the above object is a head of a predetermined bit in the communication protocol between the microcomputer responsible for the interface with the various devices in the vehicle and the CPU for system control for ATOM operation A code part, a function code part of a predetermined bit assigned after the head code part and corresponding to a key selected by the driver, and a bit assigned after the function code part and assigned according to the content of the function code Is variable and communication data consisting of a data portion representing data corresponding to the function code is bidirectionally communicated between the microcomputer and the CPU according to the contents of the function code.

1 is a system configuration of the vehicle ATOM of the present invention

2 is a diagram showing the structure of data according to a communication protocol between a CPU and a microcomputer according to the present invention;

3 is a diagram showing the contents of a function code according to the communication protocol of the present invention, code values and data for each function, and a transmission direction of data.

4 to 8 are diagrams showing the structure of data for each function code of FIG.

Explanation of symbols for main parts of the drawings

11: wireless communication network modem 13: GPS signal processing unit

15: memory 17: CPU

19: Information Service Center 21: A / V Head Unit

23: micom

Hereinafter, a communication protocol for in-vehicle ATOM operation of the present invention will be described in detail with reference to the accompanying drawings.

First, the communication protocol for ATOM operation of the present invention is applied between the CPU 17 and the microcomputer 23 shown in Figure 1, for reference, Figure 1 illustrates the operation of ATOM (Automobile Telematics Office and Multimedia) in accordance with the present invention The configuration block diagram is shown.

As shown in FIG. 1, in order to operate ATOM, a GPS signal for calculating a vehicle's position information, speed information, destination information, and the like by receiving a satellite signal transmitted from a wireless communication network modem 11 and a GPS satellite The processing unit 13, the memory unit 15 storing various data for system operation, the wireless communication network modem 11, the GPS signal processing unit 13, the memory unit 15 and the like to control the various information to the wireless communication network CPU 17 for controlling the system to exchange information with the information service center through the information service center, and output various types of information provided by the information service center 19 through the A / V head unit 21 as a screen or sound. And a microcomputer 23 for transmitting a vehicle interface signal to the CPU 17.

Here, the CPU 17 provides the location information of the vehicle using GPS satellites, the interface information of the vehicle provided from the microcomputer 23 to the information service center 19 through the wireless communication network, and also the information service center 19. Controls the entire system so that various weather information, securities information, traffic information, sports, and other Internet information including MP3 downloads can be output through a screen or voice, and the microcomputer 23 provides a CPU. The A / V head unit 21 is controlled so that various information and the like transmitted under the control of 19 are outputted on the screen or by voice, and the interface signal with various devices in the vehicle is provided to the CPU 17.

As such, the CPU 17 controls the entire system, and the microcomputer 23 allows information provided through various interface signals or wireless communication networks in the vehicle to be outputted on the screen and with voice. The CPU 17 and the microcomputer ( 23) is performed through a communication protocol to be described later to control the in-vehicle interface signal in real time.

2 is a diagram illustrating a data structure according to a communication protocol between a CPU and a microcomputer of the present invention. The data includes a head code part, a function code part, and a data part. 2 bytes are allocated to the head code part, 1 byte is allocated to the function code part, and the data part is changed according to the content of the function code. That is, the number of bits of the head code part and the function code part is always constant at 2 bytes and 1 byte regardless of the function code contents, but the number of bits of the data part is from 1 byte up to 4 bytes depending on the content of the function code part. Is assigned.

3 is a diagram showing the content of a function code according to the communication protocol of the present invention, a code value and data for each function, and a direction of data transmission, wherein each code value allocated to 1 byte is different according to the content of the function code. Depending on the content of the function code, it can be seen that data is transferred from the CPU to the microcomputer or from the microcomputer to the CPU.

That is, if the content of the code is related to the modem, the CPU last mode, the data retransmission request, the navigation mode switch request, the initial Video-Mute release request, In this case, it can be seen that the data is transferred from the CPU side to the microcomputer side in the case of the emergency audio termination request, and from the microcomputer side to the CPU side in other cases.

Thus, the content of each function code will be described in more detail.

FIG. 4 shows the integrated remote controller key and its output value in the function code of FIG. 3. In principle, the data of the integrated remote controller key is allocated 1 byte, but in the case of continuous key operation, 2 bytes are allocated (FIG. 3).

As shown in Fig. 4, the integrated remote control keys include Arabic numerals 0 to 9, ENT, various direction keys, menu, + (volume UP),-(volume DOWN), destination / UP, previous / DOWN, enlargement / UP, and reduction. There are / DOWN, MODE, power, screen division, navigation, current region, Eject / PBC, and although not shown in the figure, more keys may exist depending on the program design.

As shown in FIG. 3, the data according to the integrated remote controller key selection is transmitted from the microcomputer side to the CPU side. For reference, the output value of FIG. 4 represents the data value finally output from the microcomputer, and the CPU input data. If the value is "0x31", it recognizes that "1" of the integrated remote controller is selected, and if the input data value is "0x0E", it recognizes that the "ENT" key of the integrated remote controller is selected.

For example, when the "→" key is selected among the keys of the integrated remote controller, the function of the data output from the microcomputer to the CPU is "0x01" in the function code part, and "0x0F" in the data part. Will be loaded.

On the other hand, the data of the continuous key operation of the integrated remote controller is a total of 3 bytes, excluding the head code, by combining the function code part and the data part (see FIG. 3). When received once, the data structure is shown in FIG. For reference, since the number of continuous pulses received has a value of 0 to 59, a value of 61 or more is replaced with 60.

6 shows a remote control key associated with the head unit wired key and its output value. In the figure, since the direction key is capable of continuous key operation, in this case, data is allocated 2 bytes. In addition, among the remote control keys, the output values of the remote control keys are `` 0x18 '' and `` 0x22 '', which means that the `` NAVI '' key on the head unit switches the NAVIGATION mode and the ATOM mode to the toggle key. Therefore, when the output value is "0x18", the mode is switched from the A / V mode to the NAVIGATION mode, and when the output value is "0x22", the mode is switched from the NAVIGATION mode to the ATOM mode.

On the other hand, Fig. 7 shows a data structure when the content of the function code is related to the touch screen, and at least 4 bytes are allocated to the data portion in relation to the touch screen function.

As shown in FIG. 7, the data structure related to the touch screen includes a function code part of 1 byte and a data part of 4 bytes. The function code value is "0x05". The reason why the data portion is at least 4 bytes is that the coordinates of the touch screen are determined by the X-axis coordinate value and the Y-axis coordinate value, since each coordinate value is allocated by 2 bytes. As an example, when the X and Y axis pixels are pixels of 1024 × 768, the coordinates of the X axis cannot be obtained by only 1 byte (8 bits = 2 ⁸ = 256), and at least 10 bits (2 ¹⁰ = 1024) are required. Therefore, the original 8 bits allocated for the X axis coordinates are added to the upper 2 bits of the allocated 8 bits and used to obtain the X axis coordinates with a total of 10 bits. For reference, the Y-axis coordinates are also obtained in the same manner as the X-axis coordinates.

On the other hand, key data input from various call switches, such as a front call switch, rear call switch, and steering wheel call switch, is allocated 1 byte to a function code portion, and the code value is "0x07". 1 byte is allocated to the data portion, which is again allocated as a data value for the front call switch key, a data value for the rear call switch key, and a data value for the steering wheel call switching key.

In addition, the bits allocated to the steering wheel switching key and the rear call switching key are assigned to call and call termination button and information service call button values, and assigned to the front call switch key. The assigned bits are assigned to the voice memo button, SOS button, call and end button, and information service call button.

Here, the information service center call button is a function for requesting information by connecting an information service center providing various information by telephone (wireless communication network), and the SOS button is a function for accessing an emergency rescue service of the information service center, and voice memo Is literally a voice recording function.

On the other hand, in relation to the modem, 1 byte is allocated to the function code part and 1 byte is also allocated to the data part.

Fig. 8 shows the structure of data related to the modem. The value of the function code to which 1 byte is assigned is "0x08", and the data portion is composed of 8 bits in total.

Types of communication using a modem include voice communication such as a telephone call and data communication called so-called Internet connection by TCP / IP connection, and a data structure for initiating and terminating voice communication using a modem uses a modem. The function code values are the same in terms of communication, but the start data and the end data are different. The data structure for notifying the start and end of data communication is also the same as that of the modem. The function code values are the same, but the start data and the end data are different from each other.

For reference, in relation to the modem, the state of the LED indicates that the current mode is ATOM mode when the LED of a specific color is ON, and that the mode is other than ATOM mode when the LED is OFF. If blinking at regular intervals, it means that voice communication or data communication is in progress.

Subsequently, the code value of the airbag interface function among the vehicle diagnostic functions is "0x09", and 1 byte is allocated to the data portion. A predetermined bit of 1 byte allocated to the data portion is used as an airbag operation status indication bit indicating whether the airbag is operating.

On the other hand, the interface function of the sensor for measuring the speed of the vehicle has a code value of "0x0A", and 1 byte of data is allocated. The unit of speed is Km, and the speed of the vehicle is calculated by the combination of 8 bits. Since the speed can be measured up to 256 km using 8 bits alone, there is no problem in measuring the driving speed even if only 1 byte of data is allocated.

Next, the CPU last mode function will be described.

The data related to the CPU last mode is composed of a function code part of 1 byte and a data part of 2 bytes, and the data part is composed of a telephone volume setting bit, an internet setting bit, a telephone auto receiving setting bit, and a spare bit.

The CPU last mode function refers to the function that the CPU sends the last mode (the mode just before the ACC power is turned off) to the microcomputer, and the transmission time is changed when the main menu of ATOM is changed or in [Preferences]. It is when the setting value is changed. For reference, the main menu of ATOM includes [Information Search], [Schedule Management], [E-mail Listening], [Receive Information], [Voice Memo], and [Call / End].

When the CPU last mode is described as an example of a vehicle power source, the vehicle has two types of battery and ACC power source, and the battery serves as a back-up function. In other words, even if the ACC power is off, the ACC maintains the minimum information of the vehicle (such as radio frequency information used by the user before the ACC power was turned off) with the battery power. The CPU sends the current mode to the microcomputer at regular intervals because it must return to the environment before the power was turned off. This is because when the ACC power is turned off, all ICs including the CPU except the microcomputer are turned off for power consumption.

On the other hand, when the ACC power is turned off and then turned on again, all ICs including the CPU operate normally. At this time, the CPU asks Micom what state it was just before the ACC power was turned off. It is seen that this corresponds to the data transmission request code among the contents of the function code shown in FIG.

In other words, the data transfer request function is the last CPU that the CPU previously sent to the microcomputer so that the ACC power is ON and the CPU is ready to operate normally. Request the transmission of data related to the mode. In this case, the data structure according to the data transmission request is composed of a function code part of 1 byte and a data part of 2 bytes, wherein 1 byte contains data related to the last mode requested by the CPU, and the remaining 1 byte is the last requested by the CPU. Different data is loaded instead of the mode data.

Meanwhile, among the contents of the function code shown in FIG. 3, the request code for switching to the NAVI mode is a function for displaying navigation information on the vehicle LCD monitor screen. Generally, A / V, NAVIGATION, and ATOM screens are displayed on the vehicle LCD monitor.When a driver listens to music through A / V or uses the Internet at ATOM and receives traffic information from an information service center, the driver's separate operation It is a function that converts the LCD screen into a screen displaying NAVIGATION information. The request data for switching to the NAVI mode is transmitted from the CPU to the microcomputer, and the data is composed of a function code part of 1 byte and a data part of 1 byte.

The V-Mute / A-Mute release request code will be described among the contents of the function code shown in FIG. 3.

The V / A-Mute release request code indicates that when the ACC power is turned off and then turned on again, the ACC power is turned on to prevent the distorted video signal from being displayed through the LCD monitor or the distracting sound. ON), while the CPU is booting, that is, after the ACC power is turned ON, the audio code or video signal is erased until the CPU operates normally. It is composed of parts.

On the other hand, the emergency start / end code is related to the theft or accident occurrence of the vehicle, and since the location of the vehicle cannot be tracked when the vehicle is turned off, the information service center forcibly executes a short message (SMS). : It sends a short message service to force start-up. Emergency start data is transferred from the microcomputer to the CPU and emergency end data is transferred from the CPU to the microcomputer.

Here, the structure of the emergency start data and the structure of the emergency end data differ only in the function code value and the data value, and the function code allocation bit and the data allocation bit are the same.

Lastly, when describing a general mobile phone related situation, when using a handsfree of ATOM while using a general hand phone call, the dialing / receiving function using the ATOM modem is prohibited. However, if an emergency occurs in this situation, the hands-free license will be converted to ATOM's modem, allowing the CPU to control the modem. The data structure at that time consists of a function code part of 1 byte and a data part of 1 byte.

Although the data structure has been described for each content of the function codes, it is obvious that many function codes can be added according to the program setting in addition to the function codes described above.

As described above, the communication protocol for ATOM operation of the present invention has the following effects.

By bidirectionally communicating the data of each function code according to ATOM (Automobile Telematics Office and Multimedia) operation with CPU and microcomputer in a promised form, the CPU can process interface signals with various devices in the vehicle in real time. More efficient operation is possible.

Claims (8)

In the communication protocol between the microcomputer in charge of the interface with the various devices in the vehicle and the CPU in the system control for ATOM operation, A function code portion of a predetermined bit indicating a head code portion of a predetermined bit, a function code assigned after the head code portion and corresponding to a key selected by the driver, and the content of the function code assigned after the function code portion The communication protocol for a vehicle ATOM operation characterized in that the communication bit consisting of a data portion representing the data corresponding to the function code and the allocation bit is variable according to the bidirectional communication between the microcomputer and the CPU in accordance with the content of the function code. The communication protocol for vehicle ATOM operation according to claim 1, wherein the communication between the microcomputer and the CPU is performed in an asynchronous manner according to RS-232C communication protocol. The method of claim 1, wherein the contents of the function code include an integrated remote control key, an integrated remote control continuous key, a head unit wired key, a head unit continuous key, touch screen coordinates, a modem related situation, an airbag interface, a speed sensor interface, and a V / A-. Communication protocol for vehicle ATOM operation, including mute release, emergency start and stop, hands-free related situations. 4. The communication protocol of claim 3, wherein the integrated remote control serial key and the head unit continuous key have a larger number of bits in the data portion than the integrated remote control key and the head unit key. In the communication protocol between the microcomputer in charge of the interface with the various devices in the vehicle and the CPU in the system control for ATOM operation, The driver selecting either the integrated remote control key or the head unit key; Analyzing, by the microcomputer, data consisting of a head code part, a function code part, and a data part corresponding to the selected key; Transmitting the result information of the microcomputer to interpret the data to the CPU; And controlling, by the CPU, various devices for ATOM operation based on the information received from the microcomputer. 6. The communication protocol of claim 5, comprising transmitting data from the CPU to the microcomputer according to the contents of the function key selected by the driver. The method of claim 5, wherein the contents of the function code include an integrated remote control key, an integrated remote control continuous key, a head unit wired key, a head unit continuous key, touch screen coordinates, a modem related situation, a CPU last mode, an airbag interface, a speed sensor interface, A communication protocol for vehicle ATOM operation, including V / A-Mute release request, NAVI switch request, emergency start and end, hands-free related situation. 7. The vehicle according to claim 6, wherein the type of function key for transmitting data from the CPU to the microcomputer includes a modem related situation, a CPU last mode, a V / A-Mute release request, an emergency end and related situations. Communication protocol for ATOM operation.