CN101937414B - Method and device of sharing minitype USB interface for UART (Universal Asynchronous Receive/Transmitter) and USB (Universal Serial Bus) - Google Patents
Method and device of sharing minitype USB interface for UART (Universal Asynchronous Receive/Transmitter) and USB (Universal Serial Bus) Download PDFInfo
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Abstract
The invention discloses method and device of sharing a minitype USB interface for a UART and a USB, relating to the field of mobile equipment. The method and device of sharing the minitype USB interface for the UART and the USB are characterized in that a USB data transmission interface, a charging interface and a UART interface downloaded and updated by mobile phone software are skillfully multiplexed to a five-pin Micro-USB interface through two single-pole double-throw analogue switches and certain auxiliary circuits, and a USB data transmission function, a charging function and a mobile phone downloading and updating function can be achieved on the same one Micro-USB interface, i.e. a charger, a USB data transmission line and the UART interface are combined in one; three complicated functions are achieved by the Micro-USB interface with very small dimensions, thereby saving valuable space for a mobile phone and being convenient for designing a smaller-size hand-held terminal, and moreover, the device has simple structure and low implementation cost.
Description
Technical field
The present invention relates to field of mobile equipment, in particular method and the device of a kind of UART channel transfer equipment and USB USB to share micro (micro USB) interface.
Background technology
development along with the mobile phone terminal technology, improving constantly of CPU speed, application on mobile phone is more and more, function becomes increasingly complex, in order to support these interfaces of using peripheral hardware on mobile phone also more and more, for example, mobile phone needs the usb data transmission interface, charging inlet, the UART interface of cell phone software down loading updating, but in the mobile phone of prior art, these interfaces are all separately to be arranged on mobile phone, need to take simultaneously many spaces of mobile phone, bring restriction for the integrated and miniaturization of mobile phone, each interface of while divides to be arranged and also is unfavorable for reducing production costs.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The technical problem to be solved in the present invention is, defects for prior art, provide a kind of UART and USB to share method and the device of minitype USB interface, it is the usb data transmission interface, charging inlet, and the UART interface of cell phone software down loading updating (UART channel transport interface) is integrated on a minitype USB interface to be realized, reduced cost of manufacture, saved per-interface space, and simple in structure, realize easily.
The technical scheme that technical solution problem of the present invention adopts is as follows:
A kind of UART and USB share the device of minitype USB interface, comprise the minitype USB interface that is arranged on described device, wherein, also comprise interface detection module, electronic switch module, UART data transmit-receive module and usb data transceiver module;
Described interface detection module is connected with described minitype USB interface, whether inserts USB channel transfer equipment or UART channel transfer equipment for detection of described minitype USB interface, and produces corresponding control signal to described electronic switch module;
Described electronic switch module is connected with described minitype USB interface, interface detection module respectively, is used for selecting described UART data transmit-receive module or described usb data transceiver module to be connected to described minitype USB interface according to described control signal.
Described interface detection module comprises the first resistance and second resistance of series connection, and a wherein end of described the first resistance is connected with the V-BUS of described minitype USB interface end, and the other end of described the first resistance connects with reference to ground by the second resistance; Described the first resistance be connected common port that resistance connects and be connected to the control end of described electronic switch module.
Described electronic switch module comprises the first single-pole double-throw (SPDT) analog switch and the second single-pole double-throw (SPDT) analog switch;
The control end of described the first single-pole double-throw (SPDT) analog switch and the second single-pole double-throw (SPDT) analog switch is connected to described interface detection module;
The signal input part of described the first single-pole double-throw (SPDT) analog switch is connected to the D-end of described minitype USB interface, its first output terminal is connected to the UART_TXD end of described UART data transmit-receive module, and its second output terminal is connected to the USB_D-end of described usb data transceiver module;
The signal input part of described the second single-pole double-throw (SPDT) analog switch is connected to the D+ end of described minitype USB interface, its first output terminal is connected to the UART_RXD end of described UART data transmit-receive module, and its second output terminal is connected to the USB_D+ end of described usb data transceiver module.
Described UART and USB share the device of minitype USB interface, wherein,
When described interface detection module detects described minitype USB interface insertion USB channel transfer equipment, produce the first control signal to described electronic switch module, and control described electronic switch module and select described usb data transceiver module to be connected to described minitype USB interface;
When described interface detection module detects described minitype USB interface insertion UART channel transfer equipment, and produce the second control signal to described electronic switch module, control described electronic switch module and select described UART data transmit-receive module to be connected to described minitype USB interface.
Described UART and USB share the device of minitype USB interface, and wherein, described the first control signal is high-level control signal 1, and described the second control signal is low level control signal 0.
Described UART and USB share the device of minitype USB interface, and wherein, described the first resistance is 36K ohm, and the resistance of described the second resistance is 24K ohm.
A kind of UART and USB share the method for minitype USB interface, and it is realized with the device that described UART and USB share minitype USB interface, wherein, comprises step:
Interface detection module detects minitype USB interface and whether inserts USB channel transfer equipment or UART channel transfer equipment, and produces corresponding control signal to electronic switch module;
Electronic switch module selects UART data transmit-receive module or usb data transceiver module to be connected to described minitype USB interface according to described control signal.
When described interface detection module detects described minitype USB interface insertion USB channel transfer equipment, produce the first control signal to described electronic switch module, and control described electronic switch module and select described usb data transceiver module to be connected to described minitype USB interface, to enter usb data transmission mode and/or USB charge mode;
When described interface detection module detects described minitype USB interface insertion UART channel transfer equipment, and produce the second control signal to described electronic switch module, control described electronic switch module and select described UART data transmit-receive module to be connected to described minitype USB interface, to enter UART serial ports downloading mode.
Described UART and USB share the method for minitype USB interface, wherein,
Described the first control signal is high-level control signal 1, and described the second control signal is low level control signal 0.
UART provided by the present invention and USB share method and the device of minitype USB interface, with the usb data transmission interface, charging inlet, the UART interface of cell phone software down loading updating is multiplexing to the Micro-USB interface of 5 pin cleverly by two single-pole double-throw (SPDT) analog switches and some auxiliary circuits, can realize the usb data transmission on a Micro-USB interface, charging, cell phone software down loading updating function, it is charger, the usb data transmission line, the UART interface is three-in-one, with a small-sized Micro-USB Interface realization function of three kinds of complexity, for mobile phone has been saved valuable space, conveniently design more small-sized handheld terminal and simple in structure, realize that cost is low.
Description of drawings
Fig. 1 is the principle of device structured flowchart that the UART that provides of the embodiment of the present invention and USB share minitype USB interface;
Fig. 2 is the UART of the embodiment of the present invention and the device one particular circuit configurations schematic diagram that USB shares minitype USB interface;
Fig. 3 is the method flow diagram that the UART that provides of the embodiment of the present invention and USB share minitype USB interface.
Embodiment
UART provided by the present invention and USB share method and the device of minitype USB interface, and wherein, UART is universal asynchronous receiving-transmitting (Universal Asynchronous Receiver/Transmitter, UART), are used for asynchronous communication.This bus two-way communication can realize full duplex transmission and reception.USB is USB (universal serial bus) (Universal Serial Bus, USB).
For making purpose of the present invention, technical scheme and advantage clearer, clear and definite, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
The UART that the embodiment of the present invention provides and USB share the device of minitype USB interface, be mainly used in mobile phone, as shown in Figure 1, comprise Micro-USB (micro USB) interface 110 that is arranged on described device, can be connected with the plurality of devices of outside by the line with the Micro-USB interface, as shown in Figure 1, it also comprises interface detection module 130, electronic switch module 120, UART data transmit-receive module 140 and usb data transceiver module 150.
Whether described interface detection module 130 and described minitype USB interface 110 insert USB channel transfer equipment or UART channel transfer equipment for detection of described minitype USB interface 110, and produce corresponding control signal to described electronic switch module 120;
Described electronic switch module 120 is connected 130 with described minitype USB interface 110, interface detection module respectively, is used for selecting described UART data transmit-receive module 140 or described usb data transceiver module 150 to be connected to described minitype USB interface according to described control signal.
When described interface detection module 130 detects described minitype USB interface 110 insertion USB channel transfer equipment, produce the first control signal to described electronic switch module 120, and control described electronic switch module 120 and select described usb data transceiver module 150 to be connected to described minitype USB interface 110;
When described interface detection module 130 detects described minitype USB interface 110 insertion UART channel transfer equipment, and produce the second control signal to described electronic switch module 120, and control described electronic switch module 120 and select described UART data transmit-receive module 140 to be connected to described minitype USB interface 110.
Below will be described in further details the device that UART of the present invention and USB share minitype USB interface by a concrete Application Example.
As shown in Figure 2, the Micro-USB of standard (micro USB) interface 110 comprises 5 pins, and in the embodiment of the present invention, 5 pins of described Micro-USB (micro USB) interface are defined as respectively:
The the 1. pin: Vbus end;
The the 2. pin: D-end;
The the 3. pin: D+ end;
The the 4. pin: ID end;
The 5. pin: GND ground terminal.
As shown in Figure 2, in the present embodiment, described interface detection module 130 comprises the first resistance R 1 and second resistance R 2 of series connection, and a wherein end of described the first resistance R 1 is connected with the V-BUS of described minitype USB interface 110 end, and the other end of described the first resistance R 1 connects with reference to ground by the second resistance R 2; Described the first resistance R 1 be connected common port that resistance R 2 connects and be connected to the control end SEL of described electronic switch 120.Preferably, described the first resistance is 36K ohm, and the resistance of described the second resistance is 24K ohm.
As shown in Figure 2, further, described electronic switch module 120 comprises the first single-pole double-throw (SPDT) analog switch 121 and the second single-pole double-throw (SPDT) analog switch 122.
The control end S21 of the control end S11 of described the first single-pole double-throw (SPDT) analog switch 121 and the second single-pole double-throw (SPDT) analog switch 122 is connected to described interface detection module 130.
The signal input part C of described the first single-pole double-throw (SPDT) analog switch 121
11Be connected to the D-end of described minitype USB interface 110, its first output terminals A
11Be connected to the UART_TXD end of described UART data transmit-receive module 140, its second output terminals A
12Be connected to the USB_D-end of described usb data transceiver module 150.
The signal input part C of described the second single-pole double-throw (SPDT) analog switch 122
21Be connected to the D+ end of described minitype USB interface 110, its first output terminals A
21Be connected to the UART_RXD end of described UART data transmit-receive module 140, its second output terminals A
22Be connected to the USB_D+ end of described usb data transceiver module.
In the present embodiment, the control linkage truth table of the control end S11 of described the first single-pole double-throw (SPDT) analog switch 121 and the second single-pole double-throw (SPDT) analog switch 122 is as follows:
| SEL | Control |
| 0 | A11 is connected to C11, and A21 is connected to C21 |
| 1 | A12 is connected to C11, and A22 is connected to C21 |
The basic ideas of the embodiment of the present invention are:
1, handheld terminal such as mobile phone only are slave (from equipment) and are used under normal circumstances, thus the ID pin of Micro-USB (micro USB) interface 110 generally need not, be vacant state for mobile phone circuit;
2 and the mobile phone power-on default conditions are UART serial ports downloading mode, the mobile phone terminal main control chip can be waited for the order from the UART mouth, if do not receive orders within the regular hour, namely enter the start flow process, so the present invention will arrange Micro-USB (micro USB) interface 110 default signal when circuit design be the UART signal, and, do not insert in the situation that open state detects any peripheral hardware, be set to the UART signal yet.
3, after USB and charger were extracted, the analog switch of mobile phone will switch back the serial ports downloading mode that the UART signal is connected with the Micro-USB interface.
Based on above-mentioned thinking, the present invention's specific works principle embodiment illustrated in fig. 2 is as follows: minute three kinds of functions realize:
The first function, the UART serial ports download function by the UART signal wire: separating machine and the analysis of shutdown two states here.
(1) (be defaulted as A11 and be connected to C11 under off-mode, A21 is connected to C21, as shown in Figure 2): when mobile phone is pressed key, base band main control chip electrification reset, the UART serial ports begins to wait for the download command that transmits from computer by the UART serial port download line, and judgement enters downloading mode or enters the normal boot-strap pattern; If insert the UART serial port download line and receive UART serial ports download command.
Namely when described interface detection module 130 detects described minitype USB interface 110 insertion UART channel transfer equipment, and to produce low level be that the second control signal of 0 is to described electronic switch module 120, controlling described electronic switch module 120 selects described UART data transmit-receive module 140 to be connected to described minitype USB interface 110, mobile phone enters downloading mode, begins carry out the software download or upgrade by UART signal wire UART_TXD and the UART_RXD of UART data transmit-receive module 140; If do not receive at the appointed time UART serial ports download command, mobile phone enters the normal boot-strap pattern, if complete handset program, mobile phone normal boot-strap have been arranged in mobile phone.
(2) under open state: the default interface signal configures is the UART signal, if there is the UART downloading wire to insert, can carry out the mobile phone debugging mode.
The second, be the USB function: on-off state and above-mentioned the first are basic identical: when the usb data line inserts, the usb data line can be held output 5V high level by V_BUS, produce hardware interrupts, this moment, the SEL end was pulled to high level, namely was produced as the first control signal of high level 1; The A12 that controls described the first single-pole double-throw (SPDT) analog switch 121 is connected to C11, and the A22 that controls the second single-pole double-throw (SPDT) analog switch 122 is connected to the pattern of C21, this moment, usb data transceiver module 150 was communicated with Micro-USB (micro USB) interface 110, after interrupting producing, mobile phone carries out the USB device status recognition, after correctly identifying USB device and being configured to correct status, mobile phone can enter USB charge mode and usb data transmission mode this moment.
The third charger function: on-off state is basic identical with above-mentioned the first: when charger inserts, charger can be held output 5V high level by V_BUS, produce hardware interrupts, this moment, SEL was pulled to high level, namely was produced as the first control signal of high level 1; The A12 that controls described the first single-pole double-throw (SPDT) analog switch 121 is connected to C11, and the A22 that controls the second single-pole double-throw (SPDT) analog switch 122 is connected to the pattern of C21, mobile phone usb data transmission circuit 150 is communicated with described miniature interface 110, after interrupting producing, mobile phone carries out the USB device status recognition, when finding that the usb data line states is not right, in the time of can not being identified as USB, mobile phone judgement charger inserts, and mobile phone enters the charger charge mode.
By realizing simultaneously three kinds of functions with upper type, both saved interface, make cell phone appearance more attractive in appearance, realized again function.Also reduced simultaneously cost of manufacture.
Based on the UART of above-described embodiment and the device of the shared minitype USB interface of USB, the embodiment of the present invention also provides a kind of UART and USB to share the method for minitype USB interface, as shown in Figure 3, comprises step:
Step S310, interface detection module detect minitype USB interface and whether insert USB channel transfer equipment or UART channel transfer equipment, and produce corresponding control signal to electronic switch module;
Electronic switch module selects UART data transmit-receive module or usb data transceiver module to be connected to described minitype USB interface according to described control signal.
Described UART and USB share the method for minitype USB interface, and it also comprises:
Step S320, when described interface detection module detects described minitype USB interface and inserts USB channel transfer equipment, produce the first control signal to described electronic switch module, and control described electronic switch module and select described usb data transceiver module to be connected to described minitype USB interface, to enter usb data transmission mode and/or USB charge mode;
Step S330, when described interface detection module detects described minitype USB interface and inserts UART channel transfer equipment, and produce the second control signal to described electronic switch module, control described electronic switch module and select described UART data transmit-receive module to be connected to described minitype USB interface, to enter UART serial ports downloading mode.
Wherein, described the first control signal is high-level control signal 1, and described the second control signal is low level control signal 0.
UART provided by the present invention and USB share method and the device of minitype USB interface, with the usb data transmission interface, charging inlet, the UART interface of cell phone software down loading updating is multiplexing to the Micro-USB interface of 5 pin cleverly by two single-pole double-throw (SPDT) analog switches and some auxiliary circuits, can realize the usb data transmission on a Micro-USB interface, charging, cell phone software down loading updating function, it is charger, the usb data transmission line, the UART interface is three-in-one, with a small-sized Micro-USB Interface realization function of three kinds of complexity, for mobile phone has been saved valuable space, conveniently design more small-sized handheld terminal and simple in structure, realize that cost is low.
Should be understood that, application of the present invention is not limited to above-mentioned giving an example, and for those of ordinary skills, can be improved according to the above description or conversion, and all these improve and conversion all should belong to the protection domain of claims of the present invention.
Claims (6)
1. a UART and USB share the device of minitype USB interface, comprise the minitype USB interface that is arranged on described device, it is characterized in that, also comprise interface detection module, electronic switch module, UART data transmit-receive module and usb data transceiver module;
Described interface detection module is connected with described minitype USB interface, whether inserts USB channel transfer equipment or UART channel transfer equipment for detection of described minitype USB interface, and produces corresponding control signal to described electronic switch module;
Described electronic switch module is connected with described minitype USB interface, interface detection module respectively, is used for selecting described UART data transmit-receive module or described usb data transceiver module to be connected to described minitype USB interface according to described control signal;
Described interface detection module comprises the first resistance and second resistance of series connection, and a wherein end of described the first resistance is connected with the V-BUS of described minitype USB interface end, and the other end of described the first resistance connects with reference to ground by the second resistance; Described the first resistance be connected common port that resistance connects and be connected to the control end of described electronic switch module;
Described electronic switch module comprises the first single-pole double-throw (SPDT) analog switch and the second single-pole double-throw (SPDT) analog switch;
The control end of described the first single-pole double-throw (SPDT) analog switch and the second single-pole double-throw (SPDT) analog switch is connected to described interface detection module;
The signal input part of described the first single-pole double-throw (SPDT) analog switch is connected to the D-end of described minitype USB interface, its first output terminal is connected to the UART_TXD end of described UART data transmit-receive module, and its second output terminal is connected to the USB_D-end of described usb data transceiver module;
The signal input part of described the second single-pole double-throw (SPDT) analog switch is connected to the D+ end of described minitype USB interface, its first output terminal is connected to the UART_RXD end of described UART data transmit-receive module, and its second output terminal is connected to the USB_D+ end of described usb data transceiver module.
2. UART and USB share the device of minitype USB interface according to claim 1, it is characterized in that,
When described interface detection module detects described minitype USB interface insertion USB channel transfer equipment, produce the first control signal to described electronic switch module, and control described electronic switch module and select described usb data transceiver module to be connected to described minitype USB interface;
When described interface detection module detects described minitype USB interface insertion UART channel transfer equipment, and produce the second control signal to described electronic switch module, control described electronic switch module and select described UART data transmit-receive module to be connected to described minitype USB interface.
3. UART and USB share the device of minitype USB interface according to claim 2, it is characterized in that, described the first control signal is high-level control signal 1, and described the second control signal is low level control signal 0.
4. UART and USB share the device of minitype USB interface according to claim 1, it is characterized in that, described the first resistance is 36K ohm, and the resistance of described the second resistance is 24K ohm.
5. a UART and USB share the method for minitype USB interface, and the device that its right to use requires 1 described UART and USB to share minitype USB interface is realized, it is characterized in that, comprises step:
Interface detection module detects minitype USB interface and whether inserts USB channel transfer equipment or UART channel transfer equipment, and produces corresponding control signal to electronic switch module;
Electronic switch module selects UART data transmit-receive module or usb data transceiver module to be connected to described minitype USB interface according to described control signal;
When described interface detection module detects described minitype USB interface insertion USB channel transfer equipment, produce the first control signal to described electronic switch module, and control described electronic switch module and select described usb data transceiver module to be connected to described minitype USB interface, to enter usb data transmission mode and/or USB charge mode;
When described interface detection module detects described minitype USB interface insertion UART channel transfer equipment, and produce the second control signal to described electronic switch module, control described electronic switch module and select described UART data transmit-receive module to be connected to described minitype USB interface, to enter UART serial ports downloading mode.
6. UART and USB share the method for minitype USB interface according to claim 5, it is characterized in that,
Described the first control signal is high-level control signal 1, and described the second control signal is low level control signal 0.
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