CN100489822C - Audio system - Google Patents
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- CN100489822C CN100489822C CNB2007100023573A CN200710002357A CN100489822C CN 100489822 C CN100489822 C CN 100489822C CN B2007100023573 A CNB2007100023573 A CN B2007100023573A CN 200710002357 A CN200710002357 A CN 200710002357A CN 100489822 C CN100489822 C CN 100489822C
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/382—Information transfer, e.g. on bus using universal interface adapter
- G06F13/387—Information transfer, e.g. on bus using universal interface adapter for adaptation of different data processing systems to different peripheral devices, e.g. protocol converters for incompatible systems, open system
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0042—Universal serial bus [USB]
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Abstract
This invention provides an audio system and a USB/UART communication system for audio system. An audio system sets a signal line path between the medium of an audio device and an external device and uploads a digital audio file from the external device to the audio device according to a user's manipulation of the audio. In addition, a communication system selectively uses USB and UART communications by commonly using a single USB connector and connects a connector of an external device and an audio/USB/UART common connector through a single cable, so that audio/USB or audio/UART signals are selectively outputted through a common audio signal line. Accordingly, the audio system can interface with various kinds of external devices without external modification or additional installation of a dedicated interface in the audio device with a USB connector. In addition, the USB/UART common communication system can commonly use the USB connector without regard to USB and UART connection signals and can selectively output the audio/USB or audio/UART signals through the single cable in the audio device.
Description
Technical field
The present invention relates to a kind of audio system, in this audio system, utilize USB (universal serial bus) (USB) or expansion connector to come the signalization line by the medium of audio frequency apparatus and external unit, upload the digital audio file that is stored in this external unit according to user's operation, and by this audio frequency apparatus output sound.
In addition, the present invention relates to a kind of USB/UART common communication system, wherein adopt single USB connector to detect USB automatically and be connected signal, and can utilize detected USB to be connected signal-selectivity ground with UART and use USB to communicate by letter as common signal line with UART with UART.
And, the present invention relates to a kind of USB/UART common communication system, wherein, the public connector of the connector of external unit and audio frequency/USB/UART connects by unit cable, and by common audio signal line options ground output audio/USB or audio frequency/UART signal.
Background technology
Along with popularizing of various media players, the consumer more and more wants to listen to the song that is stored in the media player by the speaker system of hoot device or home audio equipment.For this reason, on traditional media player, add the FM sending function, thereby sent the song of media renderer plays by specific FM frequency.And audio frequency apparatus is by coming output audio signal with the tuning frequency of FM receiving mode.
In addition, the Aux line in the conventional audio equipment extends and is connected to the earphone jack of media player individually.Like this, along with popularizing of digital media technology, the consumer more and more wants to play-over the digital content that is stored in the USB storage by the speaker system of hoot device or home audio equipment.
For this reason, exist the applicant on April 4th, 2002 submit (korean patent application No.2003-21307) to and authorize (Korean Patent Registration number 403,376) on October 15th, 2003 be entitled as " A MEDIAL PROCESSING DEVICE USING AN EXTERNALSORTAGE DEVICE " patented claim.According to this patent, a kind of audio frequency apparatus comprises the usb host interface that directly reads and play the content that is stored in the USB storage.
The MP3 player that utilizes the media bank of above-mentioned digital media technology or media player to comprise to utilize standard USB or the product line of USB flash memory disk (UFD), and utilize universal asynchronous receiver (UART) and IEEE 1394 Apple i-POD product line as interface.
In the Apple i-POD shown in Fig. 1, MP3 player 10 comprises 32 pin connectors 11 and IEEE1394 connector 12.These IEEE 1394 connectors 12 are connected on the Apple PC, and are used to download mp3 file.MP3 player 10 is connected on the telepilot and is used for controlling this equipment and showing song information with the UART communication plan.
In addition, as shown in Figure 2,32 pin connectors 11 of MP3 player 10 are connected to the 32 pin connectors 21 that are installed in addition in the automobile audio 20.Automobile audio 20 receives song information with the UART communication plan, and provides device control message to MP3 player 10.A kind of automobile audio assembly of use 32 pin connectors is provided like this.This automobile audio is called as " iPOD-ready ", and connects analogue audio frequency separately by the Aux line.
In recent years, tend to USB connector is installed in the automobile audio.Therefore, in order to realize iPOD-ready or UART communication, automobile audio must comprise expansion connector and USB connector, thereby causes the low and design problem of space efficiency.
Because only can connect Apple i-POD by special purpose interface, and utilize the player of UART communication to have expansion connector and the USB connector that differs from one another, so if the interface of automobile audio is not set in addition, then utilize traditional scheme aspect have restriction.Although the consumer has bought a large amount of Apple i-POD or UART communication products, utilization factor is not high.
And USB, UART and AUDIO connector are arranged on separately in existing automobile audio or the home audio system.Therefore, when using USB and AUDIO connector, must use USB cable and AUDIO cable separately.In addition, when using UART and AUDIO connector, must use UART cable and AUDIO cable separately.
Summary of the invention
The object of the present invention is to provide a kind of audio system, this audio system can provide the interface between external unit and the audio frequency apparatus, and do not limit the communication of external unit or any link block standard of interface, and can upload the digital audio file that is stored in the external unit to the operation of audio frequency apparatus, thereby from the audio frequency apparatus output sound according to the user.
Another object of the present invention is to provide a kind of USB/UART common communication system, this USB/UART common communication system can provide the interface to external unit, and does not limit the communication of external unit or any link block standard of interface.
Another object of the present invention is to provide a kind of USB/UART common communication system, this USB/UART common communication system is connected signal by the USB that single USB connector detects from external unit with UART, and switch to detected connection signal is connected to USB or UART data signal line, communicate by letter with UART thereby optionally make it possible to carry out USB.
Another object of the present invention is to provide a kind of USB/UART common communication system, this USB/UART common communication system can utilize the public connector of single audio frequency/USB/UART of the connector that is connected to external unit by common audio signal line options ground output audio/USB or audio frequency/UART signal.
To achieve these goals, the invention provides a kind of audio system with external unit, this audio system comprises: adapter, this adapter has the external unit connector at a terminal place, and has USB connector at the another terminal place, thereby provide signal to connect between them, described external unit connector is set for and is connected to external unit; And audio frequency apparatus, this audio frequency apparatus comprises: USB connector, the interface that it is used to be provided to the external unit that is directly connected on it or passes through the external unit of described adapter connection; Multiplexer, it is used for according to selecting control signal to select the signal path of a conduct of usb signal line and serial signal line for described USB connector; The USB controller is connected to described external unit by usb communication during its path at the usb signal line is provided with, and the digital audio file that receives from described external unit is decoded, thus output sound; Serialization controller is connected to described external unit by described adapter during its path in serial signal line is provided with, and receives song information by serial communication, thereby provides equipment controling signal according to user's operation to described external unit; And Audio Controller, it is used for providing described selection control signal according to device identifying information to described multiplexer when described external unit connects by described USB connector, wherein, when described Audio Controller is USB device at described external unit, provide digital audio file by described USB controller from described external unit, and when described external unit is not USB device, receive song information and provide equipment controling signal from described external unit by described serialization controller, thereby drive described external unit according to described equipment controling signal to described external unit.
To achieve these goals, when described external unit is connected to described USB connector, carry out usb communication or serial communication according to the Audio Controller of audio system of the present invention, and by determining whether described external unit is that USB device is come the signalization path.
To achieve these goals, the invention provides a kind of audio system with external unit, this audio system comprises: adapter, this adapter has the external unit connector at a terminal place, and has USB connector at the another terminal place, thereby provide signal to connect between them, described external unit connector is set for and is connected to external unit; And audio frequency apparatus, this audio frequency apparatus comprises: USB connector, the interface that it is used to be provided to the external unit that is directly connected on it or passes through the external unit of described adapter connection; The USB controller is connected to described external unit by usb communication during its path at USB connector and usb signal line is provided with, and the digital audio file that receives from described external unit is decoded, thus output sound; Serialization controller, during being provided with, its path in described USB connector and serial signal line is connected to described external unit by described adapter, and by serial communication reception song information, thereby provide equipment controling signal to described external unit according to user's operation; And Audio Controller, it is used for when described external unit connects by described USB connector, according to USB or serial communication result, the path of USB or serial signal line is set based on the identifying information of described equipment, wherein, when described Audio Controller is USB device at described external unit, provide digital audio file by described USB controller from described external unit, and when described external unit is not USB device, receive song information and provide equipment controling signal from described external unit by described serialization controller, thereby drive described external unit according to described equipment controling signal to described external unit.
To achieve these goals, the serial communication of carrying out in audio system according to the present invention is universal asynchronous receiver (UART).
To achieve these goals, be connected the UART signal that sends and receive described USB connector according to the adapter of audio system of the present invention signal wire by expansion aerial lug and described USB connector, thereby at the external unit with expansion connector with have between the audio system of described USB connector and provide signal to connect.
To achieve these goals, the invention provides a kind of USB/UART common communication system, this USB/UART common communication system comprises: connector, it is used to provide the interface to external unit, this connector have signal wire (D+_RXD, D-_TXD); Analog switch, its be used for according to described selection control signal at the described signal wire of described connector (D+_RXD, D-_TXD) select the UART data signal line (UART_TXD, UART_RXD) and usb data signal wire (USB_HD+, in USB_HD-) one; And system controller, it is used for described UART data signal line is arranged to the GPIO port, read the signal level of described UART data signal line, and detect described connector and be connected to UART or still be connected to USB according to reading the result, wherein, when detecting described UART and connect signal, the described UART data signal line of described system controller is set to the UART port, connect described UART data signal line and described connector signal line according to described selection control signal, carry out UART communication; And when detecting described USB and connect signal, described system controller connects described usb data signal wire and described connector signal line by described analog switch, carries out usb communication then.
To achieve these goals, USB/UART common communication system according to the present invention is that HIGH and described D+_RXD signal wire determine that described UART is connected to described connector during for LOW at described D-_TXD signal wire.
To achieve these goals, the invention provides a kind of USB/UART common communication system, this USB/UART common communication system comprises: connector, it is used to provide the interface to external unit, this connector has the signal wire of being connected to data (D+, D-) the first signal wire port (GPIO_TXD, GPIO_USB_HD+) and the secondary signal line cap (GPIO_RXD, GPIO_USB_HD-); And system controller, it is used for the described first and second signal wire ports and is set to the GPIO port, read the signal level of described UART data signal line, and detect described connector and be connected to described UART or still be connected to described USB according to reading the result, wherein, when detecting described UART and connect signal, (GPIO_TXD GPIO_RXD) is set to UART port and carry out UART communication to described system controller with described UART signal wire port; And when detecting described USB and connect signal, (GPIO_USB_HD+ GPIO_USB_HD-) is set to USB port to described system controller, carries out usb communication then with described usb signal line cap.
To achieve these goals, USB/UART common communication system according to the present invention determines that described UART be connected to described connector for HIGH and the described first signal wire port (GPIO_TXD) during for LOW at described secondary signal line cap (GPIO_RXD).
To achieve these goals, USB/UART common communication system according to the present invention determines that described USB be connected to described connector for HIGH and described secondary signal line cap (GPIO_RXD) during for LOW at the described first signal wire port (GPIO_TXD).
To achieve these goals, the invention provides a kind of USB/UART common communication system, this USB/UART common communication system comprises: connector, it is used to provide the interface to external unit, this connector have signal wire (D+_RXD, D-_TXD); Analog switch, it is used for according to selecting control signal at described connector signal line (D+_RXD, D-_TXD) select GPIO signal lines (GPIO_A, GPIO_B), UART data signal line (UART_TXD, UART_RXD) and usb data signal wire (USB_HD+, in USB_HD-) one; And system controller, it is used to read the signal level of described connector signal line, and be used for detecting described connector and being connected to described UART or still being connected to described USB according to reading the result, wherein, when detecting described UART and connect signal, described system controller connects described UART data signal line and described connector signal line according to described selection control signal, carries out UART communication then; And when detecting described USB and connect signal, described system controller connects described usb data signal wire and described connector signal line by described analog switch, carries out usb communication then.
To achieve these goals, USB/UART common communication system according to the present invention determines that described UART be connected to described connector for HIGH and described GPIO signal lines (GPIO_A) during for LOW at described GPIO detection signal data line (GPIO_B).
To achieve these goals, USB/UART common communication system according to the present invention determines that described USB be connected to described connector for HIGH and described GPIO signal lines (GPIO_B) during for LOW in described GPIO signal lines (GPIO_A).
To achieve these goals, the invention provides a kind of USB/UART common communication system, this USB/UART common communication system comprises: the external unit connector, and this external unit connector is connected to external unit, so that audio interface to be provided; Connector body, it is used for connecting sound signal and USB/UART signal publicly; Telecommunication cable, it is used for connecting described sound signal and described USB/UART signal between described external unit connector and described connector body; And audio frequency apparatus, it is connected to described connector body, optionally to receive audio frequency/USB or audio frequency/UART signal.
To achieve these goals, connector body according to USB/UART common communication system of the present invention comprises audio jack and single USB/UART connector, and described audio frequency apparatus comprises and the corresponding audio jack connector of described audio jack, and with the corresponding USB/UART connector of described USB/UART connector.
To achieve these goals, the invention provides a kind of USB/UART common communication system, this USB/UART common communication system comprises: the external unit connector, and this external unit connector is connected to external unit, so that audio interface to be provided; Connector body, it is used for connecting sound signal and USB/UART signal publicly, and described connector body has audio jack and single USB/UART connector; And telecommunication cable, it is used for connecting described sound signal and described USB/UART signal between described external unit connector and described connector body.
Description of drawings
These of this overall inventive concept and/or others and purpose will be from below in conjunction with becoming the description of accompanying drawing to embodiment obviously and easier to understand, in the accompanying drawings:
Fig. 1 is the block diagram of the connection between traditional MP3 player of expression and the telepilot;
Fig. 2 is the block diagram of the connection between traditional MP3 player of expression and the automobile audio;
Fig. 3 is the block diagram that is illustrated in according to the connection of the external unit that utilizes standard USB in the audio system of the embodiment of the invention;
Fig. 4 is the block diagram that is illustrated in according to the connection of the external unit that utilizes serial communication in the audio system of the embodiment of the invention;
Fig. 5 is the block diagram that is illustrated in according to adapter in the audio system of the embodiment of the invention and the connection between the audio frequency apparatus;
Fig. 6 is illustrated in the adapter in the audio system according to another embodiment of the present invention and the block diagram of the connection between the audio frequency apparatus;
Fig. 7 is the block diagram according to the audio system of the embodiment of the invention;
Fig. 8 is the block diagram according to the USB/UART common communication system of the embodiment of the invention;
Fig. 9 is the circuit diagram of the USB/UART common communication system of Fig. 8;
Figure 10 is the process flow diagram of expression according to the operation of the USB/UART common communication system of the embodiment of the invention;
Figure 11 is the circuit diagram according to the communication system of utilizing the USB/UART/GPIO function of the embodiment of the invention publicly;
Figure 12 is the process flow diagram of expression according to the operation of the communication system of utilizing the USB/UART/GPIO function of the embodiment of the invention publicly;
Figure 13 is the circuit diagram according to the communication system of utilizing the USB/UART/GPIO function separately of the embodiment of the invention;
Figure 14 is the process flow diagram of expression according to the operation of the communication system of utilizing the USB/UART/GPIO function separately of the embodiment of the invention;
Figure 15 is the block diagram according to the USB/UART common communication system of the embodiment of the invention; And
Figure 16 is the process flow diagram of expression according to the operation of the USB/UART common communication system of the embodiment of the invention.
Embodiment
To describe the embodiment of this overall inventive concept now in detail, its example be shown in the accompanying drawing, and in institute's drawings attached, use identical Reference numeral to represent components identical.Below embodiment is described, so that this overall inventive concept to be described by the reference accompanying drawing.
Hereinafter with reference to the audio system of Fig. 3 to Fig. 7 detailed description according to the embodiment of the invention.
Fig. 3 is the block diagram that is illustrated in according to the connection of the external unit that utilizes standard USB in the audio system of the embodiment of the invention, Fig. 4 is the block diagram that is illustrated in according to the connection between the external unit that utilizes serial communication in the audio system of the embodiment of the invention, and Fig. 5 is the block diagram that is illustrated in according to adapter in the audio system of the embodiment of the invention and the connection between the audio frequency apparatus.
To shown in Figure 5, the audio system that includes external unit 100 comprises adapter 200 and audio frequency apparatus 300 as Fig. 3.
With reference to Fig. 3, external unit 100 can be to use USB flash memory disk (UFD) or the MP3 player of standard USB as external unit link block 101.
With reference to Fig. 4, external unit 100 comprises expansion connector.This external unit 100 can be to utilize the MP3 player based on UART communication of 32 pin connectors as external unit link block 101.The representative illustration of this MP3 player is Apple i-POD.
With reference to Fig. 5, adapter 200 comprises expansion aerial lug 201 an end, and comprises USB connector 202 in the other end.Expansion aerial lug 201 is connected to corresponding with the external unit link block 101 of external unit 100.Adapter 200 provides the signal between external unit 100 and the audio frequency apparatus 300 to connect.
With reference to Fig. 5, the signal wire that adapter 200 utilizes between expansion aerial lug 201 and the USB connector 202 is via USB connector 202 transmission/reception UART signals.Therefore, adapter 200 provides the signal between external unit 100 with 32 pin connectors and the audio frequency apparatus 300 with USB connector 301 to connect.
Although the example as the aerial lug 201 at the place, end that is arranged on adapter 200 has been described 32 pin expansion connectors, the invention is not restricted to this.Should be appreciated that, can make amendment this expansion connector, and this expansion connector can be connected to be arranged on external unit 100 in outside link block 101 in the quantity of pin of expansion connector corresponding.
With reference to Fig. 5, audio frequency apparatus 300 comprises single USB connector 301, multiplexer 302, Audio Controller 303, USB controller 304 and serialization controller 305.Audio frequency apparatus 300 comprises the function of main frame player function and control Apple i-POD MP3 player.
As shown in Figure 3, when the UFD 100 that utilizes standard USB as interface is directly connected on the audio frequency apparatus 300, upload digital audio file (data) from the internal storage space of the UFD 100 that is connected to automobile audio, audio frequency apparatus 300 is decoded to the digital audio file of being uploaded subsequently, to pass through speaker system output audio sound.
For this reason, audio frequency apparatus 300 has the usb host function.Audio frequency apparatus 300 is by the flash memory of USB interface visit UFD 100, and reading corresponding data.
Fig. 4 is the block diagram that is illustrated in according to the connection of the external unit that utilizes serial communication in the audio system of the embodiment of the invention.Specifically, the MP3 player of Apple i-POD product line connects by 32 pin expansion connectors, and sends song information/from UART receiving equipment control signal to UART during serial communication.
When externally equipment 100 connected by USB connector 301, Audio Controller 303 provided the selection control signal according to device identifying information to multiplexer 302.When externally equipment 100 was USB device, Audio Controller 303 was carried out control, to provide digital audio file by USB controller 304 from external unit 100.When externally equipment 100 is not USB device, Audio Controller 303 is controlled, receive song informations to pass through serialization controller 305 from external unit 100, and provide according to user's apparatus operating control signal, to drive external unit 100 according to equipment controling signal to external unit 100.
In addition, when externally equipment 100 connected by USB connector 301, Audio Controller 303 was carried out usb communication or serial communication.Audio Controller 303 determines whether external unit 100 is USB device, and produces the selection control signal to multiplexer 302.Although preferably, serial communication is UART, the invention is not restricted to serial communication, but can make amendment to the present invention in several ways.
Fig. 6 is illustrated in the adapter in the audio system according to another embodiment of the present invention and the block diagram of the connection between the audio frequency apparatus.The difference of the audio system of Fig. 6 and the audio system of Fig. 5 is not comprise multiplexer 302, and is in addition identical with 5 audio system.Therefore, omitted unnecessary description for the sake of simplicity.
With reference to Fig. 6, when externally equipment 100 connected by USB connector 301, Audio Controller 303 communicated, to provide the selection signal to USB controller 304 or serialization controller 305.Then, according to the interface of communication, Audio Controller 303 is provided with the path of USB or serial signal line according to the identifying information of external unit 100.
Select signal to drive exclusively.Communicate by one in USB controller 304 and the serialization controller 305, and according to the path of the line of signalization as a result of communication.
During for USB, the path of usb signal line is set between USB connector 301 and USB controller 304 in the result who utilize to select signal to communicate.When the result of communication is not USB, the path of serial signal line is set between USB connector 301 and serialization controller 305.
When the path of usb signal line is set, by usb communication USB controller 304 is connected to external unit 100, receive digital audio file from external unit 100, and the digital audio file that is received is decoded with output sound.
When the path of serial signal line is set, by adapter 200 serialization controller 305 is connected to external unit 100, receive song information by serial communication from external unit 100, and provide equipment controling signal to external unit 100 according to user's operation.
Fig. 7 is the block diagram according to the audio system of the embodiment of the invention.Describing situation and the external unit 100 that the external unit 100 that is connected to audio system is USB device with reference to Fig. 7 is not the situation of USB device.
When externally equipment 100 was connected to USB connector 301, Audio Controller 303 was carried out USB or serial communication, and whether definite external unit 100 is USB device.Then, Audio Controller 303 produces the corresponding selection control signal to multiplexer 302.
Also can come the signalization thread path by the Audio Controller 303 of Fig. 6.Because its difference only is the method for signalization thread path, the detailed description of its operation will be omitted.
When external unit 100 was USB device, Audio Controller 303 was controlled, so that the digital audio file that is stored in the external unit 100 to be provided by USB controller 304.
The digital audio file that offers USB controller 304 under the control of Audio Controller 303 is stored in the storer 306, and according to being loaded in this equipment based on user's apparatus operating control signal.Then, decode, and be output as audio sound by simulation output unit 308 and loudspeaker 309 by 307 pairs of digital audio files of demoder.
When external unit 100 was not USB device, Audio Controller 303 received song information by serialization controller 305 from external unit 100, and will offer external unit 100 based on user's apparatus operating control signal by serial signal line.
Drive external unit 100 in response to equipment controling signal, and selected audio file is decoded to export corresponding sound.By Aux line shown in Figure 6 the sound of being exported is offered simulation output unit 308, then by loudspeaker 309 output audio sound.
As mentioned above, audio system of the present invention can be utilized the USB connector 301 of automobile audio, with external unit 100 communicate by letter or the interface module standard irrespectively is provided with the path of specific signal line.This audio system will be provided with the equipment controling signal that produces and offer external unit 100 by the path of signal wire, and will receive digital audio file from external unit 100.Then, this audio system is decoded to digital audio file, comes output audio sound with the loudspeaker by automobile audio.
Below with reference to the USB/UART common communication system of Fig. 8 to 14 detailed description according to the embodiment of the invention.
Fig. 8 is the block diagram according to the USB/UART common communication system of the embodiment of the invention, and Fig. 9 is the circuit diagram of the USB/UART common communication system of Fig. 8.
Before the structure of describing USB/UART common communication system of the present invention and operation, the notion of UART and USB is described at first.The type that is widely used in the communication port of data transmission comprises UART and USB.
UART is a kind of asynchronous serial communication processor, and it is present in all computing machines, is used for managing serial port.In addition, all internal modems all comprise its UART.This UART is provided to the RS-232C interface of computing machine so that it can communicate with modulator-demodular unit or other serial devices, perhaps can to/from modulator-demodular unit or other serial device transmission/reception data.
USB is a kind of interface specification that connects peripherals, is to propose by 7 companies that comprise IBM are common.USB aims to provide a kind of common interface that peripherals is connected to personal computer.When peripherals was connected to personal computer, USB can connect these peripherals not needing to be provided with separately under the situation of software or hardware.Therefore, can reduce the quantity of port significantly.In addition, USB is easy to install, and can reduce the size of portable computer.
With reference to Fig. 8 and 9, in the USB/UART common communication system, USB connector signal wire D+_RXD and USB connector signal wire D-_TXD are connected between the port of port of USB connector 1100 and analog switch 1200.USB connector signal wire D+_RXD sends signal (TXD) port with UART or usb host data (D+) signals (HD+) port links to each other.USB connector signal wire D-_TXD links to each other with UART received signal (RXD) port or usb host data (D-) signals (HD-) port.
Another port of analog switch 1200 sends signal (TXD) port, UART received signal (RXD) port, HD+ port, HD-port and switching selector SW_SEL with UART and links to each other.
Although not shown among Fig. 8, signal wire UART_TXD, the UART_RXD, USB_HD+, USB_HD-, SW_SEL, SW1, SW2 and the SW3 that offer analog switch 1200 can provide or offer the controller of this system from the controller of this system.
With reference to Fig. 9, a terminal of capacitor C 1 links to each other with power vd D with the 10th pin of analog switch 1200, and another terminal links to each other with ground voltage.Capacitor C 1 has reduced fluctuation (ripple) and noise, thereby stable constant voltage is provided.
Be provided with in the condition in the path of switching selector SW_SEL,, promptly when original state, the path of UART data line be set optionally when acquiescence USB connector signal wire D-_TXD is HIGH (3.3V) and USB connector signal wire D+_RXD when being LOW (0V).When USB connector signal wire D-_TXD port is LOW (0V) and USB connector signal wire D+_RXD port when being HIGH (3.3V), the path of usb data line is set optionally.Carry out USB or UART communication in this way.
Figure 10 is the process flow diagram of expression according to the operation of the USB/UART common communication system of the embodiment of the invention.
With reference to Figure 10, the switching selector SW_SEL that links to each other with analog switch 1200 is set to original state, that is, and and the LOW of acquiescence (0V) state (S110).
Under the default conditions of switching selector SW_SEL, the D+_RXD port that makes UART send signal (TXD) port and USB connector signal wire is connected with each other, and makes the D-_TXD of UART received signal (RXD) port and USB connector signal wire be connected with each other (S120).
UART sends signal (TXD) port and UART received signal (RXD) port is set to input port (INPUT) state, as GPIO port function (S130).
The HD-port of the HD+ port of usb host data (D+) signal and usb host data (D-) signal is set to USB port state (S140).
Under this state, send TXD port (GPIOPORT) signal of signal and RXD port (GPIO PORT) signal of UART received signal is read in the USB connector 1100 from the UART of external unit.These values and LOW (0V) state or HIGH (3.3V) state are compared, determine whether to exist UART to connect signal (S150).
When existing UART from external unit to connect signal in the USB connector 1100, TXD port and RXD port are changed into UART port status (S160) by the GPIO function.Therefore, can provide UART communication (S170).
When not existing when connecting signal, read UART and send TXD port (GPIO PORT) signal of signal and RXD port (GPIOPORT) signal of UART received signal from the UART of external unit.Then, these values and HIGH (3.3V) state or LOW (0V) state are compared, determine whether to exist USB to connect signal (S180).
When existing USB from external unit to connect signal in USB connector 1100, the switching selector SW_SEL of analog switch 1200 is set to HIGH (3.3V) state.
At this moment, link to each other with the D+_RXD port of USB connector signal wire as the HD+ port of usb host data (D+) signal, and as the HD-port of usb host data (D-) signal link to each other with the D-_TXD port of USB connector signal wire (S190).In this way, can provide usb communication (S1200).
When the signal from external unit is not USB connection signal, be defined as not existing in the external unit USB or UART to connect signal.
As mentioned above, when the D+_RXD of USB connector signal wire is the D-_TXD of HIGH (3.3V) and USB connector signal wire when being LOW (0V), be defined as existing USB to connect signal (having inserted the state of USB) from external unit.When the D-_TXD of USB connector signal wire is HIGH (3.3V) and the D+_RXD of USB connector signal wire when being LOW (0V), be defined as existing UART to connect signal (having inserted the state of UART) from external unit.
Therefore, the testing conditions (being connected with the state of pull down resistor) that connects signal from the UART of external unit or USB satisfies the value of following table 1.
Table 1
| D-_TXD or UART_RXD | D+_RXD or UART_TXD | |
| Do not have | LOW(0V) | LOW(0V) |
| UART connects | HIGH(3.3V) | LOW(0V) |
| USB connects | LOW(0V) | HIGH(3.3V) |
In addition, outside UART equipment links to each other with this USB/UART common communication system, and pull-up resistor is inserted among UART_TXD and the UART_RXD (two signals of UART equipment).In this case, can change the UART condition of contact.
At this moment, although realized the UART connection, the D-_TXD of USB connector signal wire can be HIGH (3.3V) for the D+_RXD of HIGH (3.3V) and USB connector signal wire.Therefore, can make amendment to the testing conditions that UART connects according to the D-_TXD state, and irrelevant with D+_RXD state (LOW or HIGH).
In addition, although above to using GPIO port and UART port and use the micro controller unit (MCU) of analog switch 1200 to be illustrated publicly, the present invention also is applicable to the MCU that uses GPIO port and UART port publicly and do not use analog switch 1200.In addition, the present invention can be applicable to use the situation of GPIO port and UART port not publicly, that is, the UART port is used as the situation of the private port of MCU.
Figure 11 is according to the circuit diagram of the communication system of using the USB/UART/GPIO function of the embodiment of the invention publicly, shows the situation of not using analog switch.Figure 12 is the process flow diagram of expression according to the operation of the communication system of using the USB/UART/GPIO function of the embodiment of the invention publicly.
With reference to Figure 11, the GPIO_TXD port links to each other with the GPIO_USB_HD+ port that is connected to pull down resistor, and the GPIO_RXD port links to each other with the GPIO_USB_HD-port that is connected to pull down resistor.GPIO_USB_HD+ port and GPIO_USB_HD-port are connected to an end of USB connector 1100.At this moment, the GPIO port is carried out the general input function.
In the sort circuit structure, when system controller is selected one of UART port and GPIO port and selected one of USB port and GPIO port, do not need to use analog switch.
That is to say that under original state, the signal of the UART of external unit transmission signal (TXD) port is that the signal wire of HIGH (3.3V) and USB device data (D+) is HIGH (3.3V).
Therefore, can utilize the level of TXD port and HD+ port (that is usb host data (D+)) easily to select USB or UART.
More particularly, with reference to Figure 12, be the GPIO input port, and be GPIO input port (S210) GPIO_USB_HD+ port and GPIO_USB_HD-ports-settings with GPIO_TXD port and GPIO_RXD ports-settings.
Read the signal level (S220) of GPIO_TXD (GPIO PORT) port and GPIO_RXD (GPIO PORT) port.
When the GPIO_RXD port is LOW (0V) and GPIO_TXD port when being LOW (0V), be defined as not existing USB or UART to connect signal from external unit.When the GPIO_RXD port is HIGH (3.3V), be defined as having connected UART signal (S230) from external unit.When the GPIO_TXD port is HIGH (3.3V), be defined as having connected usb signal (S260) from external unit.
When the UART signal from external unit links to each other with USB connector 1100, determine the state of GPIO_RXD port and the state of GPIO_TXD port.When the state of the state of GPIO_RXD port and GPIO_TXD port is respectively HIGH (3.3V) and LOW (0V), be UART port status (S240) from the GPIO function setting with their function.Therefore, make it possible to carry out UART communication (S250).
When the usb signal from external unit links to each other with USB connector 1100, determine the state of GPIO_RXD port and the state of GPIO_TXD port.When the state of the state of GPIO_RXD port and GPIO_TXD is respectively LOW (0V) and HIGH (3.3V), be USB port state (S270) from the GPIO function setting with their function.Therefore, make it possible to carry out usb communication (S280).
Figure 13 is the circuit diagram according to the communication system of the independent use USB/UART/GPIO function of the embodiment of the invention, and Figure 14 is the process flow diagram of expression according to the operation of the communication system of the independent use USB/UART/GPIO function of the embodiment of the invention.
With reference to Figure 13, USB connector signal wire D+_RXD and USB connector signal wire D-_TXD are connected between USB connector 1100 and the analog switch 1300.USB connector signal wire D+_RXD is connected to the GPIO_A port and UART sends signal (TXD) port or usb host data (D+) signals (HD+) port.USB connector signal wire D-_TXD is connected to GPIO_B port and UART received signal (RXD) port or usb host data (D-) signals (HD-) port.
GPIO_A port, GPIO_B port, the TXD port of UART transmission signal, the RXD port of UART received signal, the HD+ port of usb host data (D+) signal, the HD-port of usb host data (D-), SW1, the SW2 of switching selector link to each other with analog switch 1200 with SW3.
In the sort circuit structure, analog switch 1200 is used to control UART port, USB port and GPIO port.
Under original state, it is HIGH (3.3V) and the signal wire of USB device data (D+) signal wire is HIGH (3.3V) that the UART of external unit sends signal (TXD) port.
Therefore, can utilize the signal level of GPIO_A and GPIO_B port optionally to provide USB or U_ART to communicate by letter.
More particularly, with reference to Figure 14, switching selector SW1, SW2 and the SW3 that is connected to analog switch 1200 is set at original state, that is, the LOW state (0V) of acquiescence (S310).
By switching selector SW1 being set at HIGH (3.3V), the GPIO_A port is connected to USB connector signal wire D+_RXD, and the GPIO_B port is connected to USB connector signal wire D-_TXD (S320).
At this moment, read the signal level (S330) of GPIO_A port and GPIO_B port.When the GPIO_A port is LOW (0V) and GPIO_B port when being LOW (0V), be defined as not existing USB or UART to connect signal from external unit.When the GPIO_B port is HIGH (3.3V) and GPIO_A port when being LOW (0V), be defined as having connected UART signal (S340) from external unit.When the GPIO_A port is HIGH (3.3V) and GPIO_B port when being LOW (0V), be defined as having connected usb signal (S370) from external unit.
When the UART signal from external unit is connected to USB connector 1100, read the state of GPIO_A port and GPIO_B port.When the state of GPIO_A port and GPIO_B port is respectively LOW (0V) and HIGH (3.3V), the switching selector SW1 of analog switch 1200 is set at LOW (0V) and switching selector SW2 is set at HIGH (3.3V) so that UART_TXD port and UART_RXD port respectively with D+_RXD port link to each other with the D-_TXD port (S350).Therefore started UART communication.
When the usb signal from external unit links to each other with USB connector 1100, the 1.5K pull-up resistor is connected to HD+ port (it is usb host data (D+) port).Therefore, when the state of GPIO_A port and GPIO_B port is respectively HIGH (3.3V) and LOW (0V), switching selector SW1, SW2 and the SW3 of analog switch 1200 are set at LOW (0V), LOW (0V) and HIGH (3.3V) respectively, thereby USB_HD+ port, USB_HD-port are connected to D+_RXD port and D-_TXD port (S380).Therefore, make it possible to carry out usb communication (S390).
Describe in detail according to USB/UART common communication system of the present invention with reference to Figure 15 and 16 below.
Figure 15 is the block diagram according to the USB/UART common communication system of the embodiment of the invention.The circuit structure of this USB/UART common communication system is described with reference to Fig. 9 below.
With reference to Figure 15, the connector 2110 of external unit 2100 links to each other by telecommunication cable 2200 with connector body 2300.Connector body 2300 comprises audio jack 2310 and USB/UART connector 2330.
USB connector signal wire D+_RXD and USB connector signal wire D-_TXD are connected between USB/UART connector 2430 and the analog switch 2440.USB connector signal wire D+_RXD sends signal (TXD) port with UART or HD+ port (it is usb host data (D+) port) links to each other.USB connector signal wire D-_TXD links to each other with UART received signal (RXD) port or HD-port (it is usb host data (D-) port).
UART transmission signal (TXD) port, UART received signal (RXD) port, HD+ port, HD-port, switching selector SW_SEL link to each other with analog switch 2440.
Although not shown in Figure 15, signal wire UART_TXD, the UART_RXD, USB_HD+, USB_HD-and the SW_SEL that offer analog switch 2440 can provide or offer the controller of this system from the controller of this system.
With reference to Fig. 9, a terminal of capacitor C 1 links to each other with power vd D with the 10th pin of analog switch 2440, and another terminal links to each other with ground voltage.Capacitor C 1 has reduced fluctuation and noise, thereby stable constant voltage is provided.
The connector 2100 of external unit provides direct-connected external unit or the interface of the external unit that connects by adapter.The connector 2100 of external unit can be the connector of standard USB connector or independent design.
L and the audio jack 2310 of R signal and the single USB/UART connector 2330 that can provide the USB/UART common communication to be connected that is used to receive audio frequency is provided connector body 2300.
Be provided with in the condition in the path of switching selector SW_SEL, when acquiescence USB connector signal wire D-_TXD is that HIGH (3.3V) and the D+_RXD port of USB connector signal wire are when being LOW (0V), that is, when original state, the path of UART data line is set optionally.When USB connector signal wire D-_TXD is LOW (0V) and the D+_RXD port of USB connector signal wire when being HIGH (3.3V), the path of usb data line is set optionally.Like this, can receive or send USB or UART common audio signal.
In traditional automobile audio or home audio system, USB connector, UART connector and audio connector are to be provided with separately.Therefore, under the situation of using USB connector and audio connector, must use USB cable and voice-frequency cable separately.Under the situation of using UART connector and audio connector, must use UART cable and voice-frequency cable separately.Yet, according to the present invention, by using the public connector of single audio frequency/USB/UART, can pass through common audio signal line output audio/USB or audio frequency/UART signal in audio frequency apparatus 2400 via the connector 2110 of external unit 2100 and the connection of the single telecommunication cable 2200 between the connector body 3200.
Figure 16 is the process flow diagram of expression according to the operation of the USB/UART common communication system of the embodiment of the invention.
The switching selector SW_SEL that links to each other with the analog switch 2440 of audio frequency apparatus 2400 is set to original state, that is, and and the LOW of acquiescence (0V) state (S410).
Under the default conditions of switching selector SW_SEL, make UART send signal (TXD) port and USB connector signal wire D+_RXD is connected with each other, and make UART received signal (RXD) port and USB connector signal wire D-_RXD be connected with each other (S420).
Read the signal level (S430) of GPIO_A port and GPIO_B port.When the GPIO_A port is LOW (0V) and GPIO_B port when being LOW (0V), be defined as not existing USB to be connected signal with UART from external unit.
When the GPIO_B port is HIGH (3.3V) and GPIO_A port when being LOW (0V), be defined as having connected UART signal (S440) from external unit.When the GPIO_A port is HIGH (3.3V) and GPIO_B port when being LOW (0V), be defined as having connected usb signal (S460) from external unit.
When UART connects the connector 2110 of signal by external unit and is connected to USB/UART connector 2330, in the public connector 2310,2410,2330 of audio frequency/USB/UART and 2430, UART is sent signal (TXD) port and UART received signal (RXD) port is changed into the UART port status from the GIPO function by unit cable 2200 connections.Therefore, can in audio frequency apparatus 2400, send or receive audio frequency/UART signal.
When the signal that is connected to USB/UART connector 2330 is not UART from the connector 2110 of external unit when connecting signal, in the public connector 2310,2410,2330 of audio frequency/USB/UART and 2430 that connects by unit cable 2200, read the signal of UART transmission signal (TXD) port (GPIO PORT) and the signal of UART received signal (RXD) port (GPIO PORT).Then, by being compared with LOW (0V) state with HIGH (3.3V) state, these values determine whether to exist USB to be connected signal (S470).
When existing USB from the connector 2110 of external unit to connect signal in the USB/UART connector 2330, the switching selector SW_SEL of analog switch 2440 is set at HIGH (3.3V) state.
At this moment, USB_HD+ port (it is usb host data (D+) ports) is linked to each other with USB connector signal wire D+_RXD, and (S470) links to each other with USB connector signal wire D-_TXD with USB_HD-port (it is usb host data (D-) ports).Therefore, can be in audio frequency apparatus 2400 transmission/reception audio frequency/usb signal (S480).
When not existing USB from the connector 2110 of external unit to connect signal in the USB/UART connector 2330, be defined as not existing USB to be connected signal with UART.
Although above to using GPIO port and UART port and use the micro controller unit (MCU) of analog switch to be illustrated publicly, the present invention also is applicable to the MCU that uses GPIO port and UART port publicly and do not use analog switch 1200.In addition, the present invention can be applicable to use the situation of GPIO port and UART port not publicly, that is, the UART port is used as the situation of the private port of MCU.
Audio system of the present invention is come the path of setting signal line according to the specific communications that is connected to the external unit of USB connector.Then, the digital audio file that is stored in the external unit is uploaded in the operation of this audio frequency apparatus according to the user, thus can be from the audio frequency apparatus output sound.
In addition, this audio system utilizes the expansion connector of the USB connector of usb communication or serial communication to be provided to the interface of external unit.Therefore, need not outside revise or install special purpose interface and just can use external unit.
In addition, this USB/UART common communication system detects USB connection signal automatically by single USB connector and is connected signal with UART, and this USB connector is used as the common data signal wire.Therefore, the user can use USB connector publicly, has nothing to do and be connected signal with UART with USB.
In addition, this USB/UART common communication system can detect audio frequency/USB or audio frequency/UART signal by common audio signal line options ground by using the connector and the public connector of single audio frequency/USB/UART of the external unit that connects via unit cable.Therefore, audio frequency apparatus can pass through unit cable optionally output audio/USB or audio frequency/UART signal.
Although illustrated and illustrated a plurality of embodiment of this overall inventive concept, but it should be appreciated by those skilled in the art, under the situation of principle that does not break away from this overall inventive concept and spirit, can change these embodiments, the scope of this overall inventive concept limits in appended claims and equivalent thereof.
Claims (5)
1, a kind of audio system with external unit, this audio system comprises:
Adapter, this adapter has the external unit connector at a terminal place, and has USB connector at the another terminal place, connects so that signal to be provided between them, and described external unit connector is set for and is connected to external unit; And
Audio frequency apparatus, this audio frequency apparatus comprises:
USB connector, the interface that is used to be provided to directly coupled external unit or passes through the continuous external unit of described adapter;
Multiplexer is used for according to selecting control signal to select the signal path of a conduct of usb signal line and serial signal line at described USB connector;
The USB controller during its path at described usb signal line is provided with, is connected to described external unit by usb communication, and the digital audio file that receives from described external unit is decoded, thus output sound;
Serialization controller during its path in described serial signal line is provided with, is connected to described external unit by described adapter, and receives song information by serial communication, provides equipment controling signal with the operation based on the user to described external unit; And
Audio Controller is used for providing described selection control signal according to device identifying information to described multiplexer when connecting described external unit by described USB connector,
Wherein, when described Audio Controller is USB device at described external unit, provide digital audio file by described USB controller from described external unit, and when described external unit is not USB device, by the song information of described serialization controller reception from described external unit, and provide described equipment controling signal to described external unit, to drive described external unit according to described equipment controling signal.
2, audio system according to claim 1,
Wherein, when described external unit was connected to described USB connector, described Audio Controller carried out usb communication or serial communication, and by determining whether described external unit is that USB device is come the signalization path.
3, a kind of audio system with external unit, this audio system comprises:
Adapter, this adapter has the external unit connector at a terminal place, and has USB connector at the another terminal place, connects so that signal to be provided between them, and described external unit connector is set for and is connected to external unit; And
Audio frequency apparatus, this audio frequency apparatus comprises:
USB connector, the interface that is used to be provided to directly coupled external unit or passes through the continuous external unit of described adapter;
The USB controller, it is connected to described external unit by usb communication when the path of usb signal line is set, and the digital audio file that receives from described external unit is decoded, thus output sound;
Serialization controller, it is connected to described external unit by described adapter when the path of serial signal line is set, and receives song information by serial communication, provides equipment controling signal with the operation based on the user to described external unit; And
Audio Controller is used for when connecting described external unit by described USB connector, according to USB or serial communication result, based on the identifying information of described external unit the path of described USB or serial signal line is set,
Wherein, when described Audio Controller is USB device at described external unit, provide digital audio file by described USB controller from described external unit, and when described external unit is not USB device, by the song information of described serialization controller reception from described external unit, and provide described equipment controling signal to described external unit, to drive described external unit according to described equipment controling signal.
4, according to any described audio system in the claim 1 to 3,
Wherein, described serial communication is universal asynchronous transmitter/receiver (UART).
5, audio system according to claim 4,
Wherein, described adapter receives and sends to the UART signal of described USB connector by the signal wire of expansion aerial lug and a described USB connector, with at the external unit with expansion connector with have between the audio frequency apparatus of USB connector and provide signal to connect.
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| KR1020060001525 | 2006-01-05 | ||
| KR1020060001525A KR100753974B1 (en) | 2006-01-05 | 2006-01-05 | Audio system |
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| CN2008101814336A Division CN101408869B (en) | 2006-01-05 | 2007-01-05 | Audio system, and USB/UART common communication system for the same |
| CN2008101814340A Division CN101408870B (en) | 2006-01-05 | 2007-01-05 | Audio system, and USB/UART common communication system for the same |
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| CNB2007100023573A Active CN100489822C (en) | 2006-01-05 | 2007-01-05 | Audio system |
| CN2008101814340A Active CN101408870B (en) | 2006-01-05 | 2007-01-05 | Audio system, and USB/UART common communication system for the same |
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| CN101452433B (en) * | 2007-11-30 | 2011-06-22 | 中兴通讯股份有限公司 | Diplex interface recognition device and method |
| CN103678226A (en) * | 2012-09-24 | 2014-03-26 | 炬力集成电路设计有限公司 | General purpose input/output (GPIO) port reuse circuit and method of chip |
| CN108737900A (en) * | 2015-03-17 | 2018-11-02 | 青岛海信宽带多媒体技术有限公司 | A kind of output method of terminal signaling |
| US10241953B2 (en) * | 2015-08-07 | 2019-03-26 | Qualcomm Incorporated | Dynamic data-link selection over common physical interface |
| CN107436853B (en) * | 2016-05-28 | 2020-06-19 | 深圳市京泉华科技股份有限公司 | Control method of USB Type-C/PD connector |
| CN110888046A (en) * | 2019-11-25 | 2020-03-17 | 展讯通信（上海）有限公司 | System-on-chip and test method, storage medium and terminal thereof |
| CN111339013A (en) * | 2020-02-28 | 2020-06-26 | 苏州浪潮智能科技有限公司 | USB and UART line switching method and device |
| CN113747279A (en) * | 2020-09-01 | 2021-12-03 | 北京沃东天骏信息技术有限公司 | Expansion base, sound box and system |
| CN112509608B (en) * | 2020-11-25 | 2022-03-08 | 广州朗国电子科技股份有限公司 | Method and device for recording sound along with channel of USB (Universal Serial bus) equipment and storage medium |
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| CN1251542C (en) * | 2003-03-31 | 2006-04-12 | 联想(北京)有限公司 | Interface device for use between redio communicaton module and terminal |
| CN2657322Y (en) * | 2003-12-10 | 2004-11-17 | 上海维华信息技术有限公司 | Communication card for hand-held mobile communication terminal equipment |
| KR200403895Y1 (en) | 2005-09-16 | 2005-12-14 | 시스템베이스 주식회사 | USB to serial communication converter |
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| KR100753974B1 (en) | 2007-08-31 |
| CN101408870A (en) | 2009-04-15 |
| CN101408869A (en) | 2009-04-15 |
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| KR20070073539A (en) | 2007-07-10 |
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