CN103778092A - USB and SD interface multiplex circuit and multiplex method - Google Patents
USB and SD interface multiplex circuit and multiplex method Download PDFInfo
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Abstract
The invention provides a USB and SD interface multiplex circuit which can lower the number of universal input and output pins and allow the USB and SD communication switching function to be achieved, and a multiplex method of the USB and SD interface multiplex circuit. The USB and SD interface multiplex circuit comprises an MCU, a USB interface and an SD interface. The MCU comprises four pieces of IO. The USB interface and the SD interface are connected with a main control chip of the MCU through the IO of the MCU, the MCU conducts time division multiplexing on the function combination of the IO through an embedded multiplex control module, and therefore the SD card communication function and the USB communication function are achieved. The application functions of the MCU are enriched, and meanwhile IO resources, occupied by a USB and SD connecting bus, of the main control chip of the MCU can be further reduced, and production cost is reduced. The USB and SD interface multiplex circuit and the multiplex method can be applied to the communication switching field.
Description
Technical field
The present invention relates to a kind of multiplex circuit, relate in particular to a kind of USB and SD interface multiplexing circuit and multiplexing method thereof.
Background technology
In consumer electronics field, portable little audio amplifier, because volume is little, audio good, function is complete, the feature such as easy to use, is extensively subject to consumer's welcome.Portable little audio amplifier generally comprises analogue audio frequency input AUX, outside speaker, SD card interface, USB interface and button.In order to support these functions, the main control chip of portable little audio amplifier generally comprises 1 AUX input pin, 3 SD card interface pins, 2 USB interface pins, 1 DAC output pin, 1 button detection pin, 2 power pins, totally 10 pins.Common 16pin encapsulates this functional requirement, and redundancy seems.In order to save main control chip cost, when going to select 8pin encapsulation, cannot realize again the functional requirement of portable little audio amplifier completely.The annexation of the USB interface of current consumption electronic product and SD interface and MCU as shown in Figure 1.
Portable little audio amplifier in actual use, generally can not carry out USB simultaneously and communicate by letter with SD, just can select a communication.If the pin multiplexing of USB interface and SD interface can be got up, save 2 pins, realize portable little function of loudspeaker box with the master control of 8pin encapsulation so, will be a very valuable solution.
Summary of the invention
Technical matters to be solved by this invention is to overcome the deficiencies in the prior art, provides a kind of and can reduce universal input output pin number and can realize USB communicate by letter with SD USB and SD interface multiplexing circuit and the multiplexing method thereof of handoff functionality.
The technical scheme that USB of the present invention and SD interface multiplexing circuit adopt is: this circuit comprises MCU, USB interface and SD interface, described MCU comprises CPU, USB module, SD module, timer and level detection module, described USB interface comprises the first data pin USB_DM and the second data pin USB_DP, SD interface comprises command pin SD_CMD, clock pin SD_CLK, data pin SD_DAT and insertion detect pin SD_DET, described MCU also comprises the first pin IOA, the second pin IOB, the 3rd pin IOC and the 4th pin IOD, described clock pin SD_CLK is connected with described the first pin IOA, described data pin SD_DAT is connected with described the second pin IOB, described command pin SD_CMD is connected with described the 3rd pin IOC, described insertion detects pin SD_DET and is connected with the 4th pin IOD, described the first data pin USB_DM and described the second data pin USB_DP and described the first pin IOA, described the second pin IOB is connected with any two pins in described the 3rd pin IOC, in described MCU, also embed and have multiplexing control module, one end of described multiplexing control module respectively with described USB module, described SD module is connected with described level detection module, the other end respectively with described the first pin IOA, described the second pin IOB, described the 3rd pin IOC is connected with described the 4th pin IOD, described multiplexing control module is for the state-detection result to USB interface and SD interface according to described level detection module, connection status to described USB interface and described SD interface and described MCU is switched, make MCU carry out USB or SD communication, wherein, described USB interface and described SD interface only have a state effective at one time.
Further, described the first pin IOA, described the second pin IOB, described the 3rd pin IOC and described the 4th pin IOD are universal input output pin.
The technical scheme that the multiplexing method of USB of the present invention and SD interface multiplexing circuit adopts is: the method comprises that USB and SD interface detect switch step, usb communication step and SD communication steps, described USB and SD interface detect in switch step, described level detection module detects the communications status of SD or USB, when SD or USB are in communications status, keep communications status; Otherwise according to testing result, described multiplexing control module makes MCU communicate by letter with SD, or MCU and usb communication.
Described USB interface comprises USB off-line state, USB presence, USB suspended state, USB state of activation, USB idle condition and usb communication state, and described SD interface comprises SD off-line state, SD presence, SD suspended state, SD state of activation, SD idle condition and SD communications status.
It is as follows that described USB and SD interface detect switch step:
1) described timer produces communication disruption request to described CPU with Fixed Time Interval t, and described CPU enters Interruption subroutine, and wherein time t is random time value;
2) Interruption subroutine flow process:
(a) if USB, in communications status, exits interruption subroutine; Otherwise, carry out step b;
(b) if SD, in communications status, exits interruption subroutine; Otherwise, carry out step c;
(c) if USB, in idle condition, carries out step g; Otherwise, carry out steps d;
(d) if SD, in idle condition, carries out step k; Otherwise, carry out step e;
(e) if SD, in suspended state, carries out step f; Otherwise, carry out step o;
(f) if USB, in suspended state, exits interruption subroutine; Otherwise, carry out step q;
(g) if SD, in suspended state, exits interruption subroutine; Otherwise, carry out step h;
(h) level detection module detects the level of the 4th pin IOD; Judge that according to the testing result of level detection module whether SD interface is online; If online, carry out step I; Otherwise carry out step j;
(i) USB interface is set to suspended state, then disconnects the connection of USB module and pin by multiplexing control module, sets up the connection of SD module and the first pin IOA, the second pin IOB and the 3rd pin IOC simultaneously; SD is set to, after state of activation, exit interruption subroutine;
(j) SD is set to, after off-line state, exit interruption subroutine;
(k) if USB, in suspended state, exits interruption subroutine; Otherwise, carry out step l;
(l) SD is set to suspended state; Disconnect the connection of SD module and the first pin IOA, the second pin IOB and the 3rd pin IOC by multiplexing control module; Level detection module detects the level of the first data pin USB_DM and the second data pin USB_DP; Judge that according to the testing result of level detection module whether USB interface is online; If online, carry out step m; Otherwise, carry out step n;
(m) USB is set to, after state of activation, exit interruption subroutine;
(n) set up the connection of SD module and the first pin IOA, the second pin IOB and the 3rd pin IOC by multiplexing control module; SD is set to state of activation; USB is set to, after off-line state, exit interruption subroutine;
(o) level detection module detects the level of the 4th pin IOD, judges that according to the testing result of level detection module whether SD interface is online; If online, carry out step p; Otherwise carry out step f;
(p) set up the connection of SD module and the first pin IOA, the second pin IOB and the 3rd pin IOC by multiplexing control module; SD is set to, after state of activation, exit interruption subroutine;
(q) level detection module detects the level of the first data pin USB_DM and the second data pin USB_DP; Judge that according to the testing result of level detection module whether USB interface is online; If online, carry out step r; Otherwise exit interruption subroutine;
(r) set up the connection of USB module and universal input output pin by multiplexing control module; USB is set to, after state of activation, exit interruption subroutine.
Described usb communication step is as follows:
(1) level detection module detects the level of the first data pin USB_DM and the second data pin USB_DP, judges that according to the testing result of level detection module whether USB interface is online; If online, carry out step (2), otherwise carry out step (5);
(2) USB is set to after communications status, carries out step (3);
(3) carry out usb communication; Complete after communication, carry out step (4);
(4) USB is set to after idle condition, exits usb communication flow process;
(5) USB is set to after off-line state, exits usb communication flow process.
Described SD communication steps is as follows:
(A) level detection module detects the level of the 4th pin IOD, judges that according to the testing result of level detection module whether SD interface is online; If online, carry out step (B), otherwise carry out step (E);
(B) SD is set to after communications status, carries out step (C);
(C) carry out SD communication; Complete after communication, carry out step (D);
(D) SD is set to after idle condition, exits SD communication process;
(E) SD is set to after off-line state, exits SD communication process.
The invention has the beneficial effects as follows: the present invention by configuring multiplexing control module control setting and universal input/output interface state in MCU, coordinate the treatment scheme of software, time-sharing multiplex the first pin IOA, the second pin IOB, the 3rd pin IOC and the 4th pin IOD, carry out usb communication or SD communication; SD equipment and USB device Plug Action and connection state, can not disturb the current USB device using or SD equipment.Compared with existing design, in not affecting MCU host applications function, reduce pin number demand, reduce the production cost of product.
USB in the present invention and SD interface multiplexing circuit and multiplexing method, without quoting more hardware, compatible usb communication agreement and SD communication protocol, reduced cost of products.
Accompanying drawing explanation
Fig. 1 is existing USB/SD joint connecting structure schematic diagram;
Fig. 2 is syndeton schematic diagram of the present invention;
Fig. 3 is USB/SD working state schematic representation of the present invention;
Fig. 4 is that USB of the present invention and SD interface detect switching flow figure;
Fig. 5 is SD communication flow diagram of the present invention;
Fig. 6 is usb communication process flow diagram of the present invention.
Embodiment
The invention discloses a kind of USB and SD interface multiplexing circuit and multiplexing method.In order to make the object, technical solutions and advantages of the present invention clearer, also describe by reference to the accompanying drawings the implementation procedure of the specific embodiment of the invention below in detail as an example of portable little audio amplifier example.
As shown in Figure 2, in the application scheme of the portable little audio amplifier of the present embodiment, apply a kind of USB and SD interface multiplexing circuit, comprised MCU, USB interface and SD interface.Described MCU comprises CPU, SD module, USB module, timer, level detection module, universal input output pin: the first pin IOA, the second pin IOB, the 3rd pin IOC and the 4th pin IOD, multiplexing control module.USB interface comprises the first data pin USB_DM and the second data pin USB_DP; SD interface comprises command pin SD_CMD, clock pin SD_CLK, data pin SD_DAT and inserts and detect pin SD_DET.SD_CLK pin is connected with IOA pin, and SD_DAT pin is connected with IOB pin, and SD_CMD pin is connected with IOC pin, and SD_DET pin is connected with IOD pin; USB_DM pin is connected with IOA and two pins of IOB respectively with USB_DP pin.
Described multiplexing control module is for the state-detection result to USB interface and SD interface according to described level detection module, connection status to described USB interface and described SD interface and described MCU is switched, make MCU carry out USB or SD communication, wherein, described USB interface and described SD interface only have a state effective at one time., described multiplexing control module is for controlling the annexation of SD module, USB module, level detection module and universal input output pin IOA, IOB, IOC, IOD; SD module, by multiplexing control module, is connected with universal input output pin IOA, IOB, IOC; USB module, by multiplexing control module, is connected with universal input output pin IOA, IOB; Level detection module, by multiplexing control module, is connected with universal input output pin IOA, IOB, IOD.
In the invention process process, USB and SD method for multiplexing interface are mainly comprised to 6 USB interface states, 6 SD Interface status and 3 workflows.
Interface status as shown in Figure 3.
6 USB interface states: USB off-line state, USB presence, USB suspended state, USB state of activation, USB idle condition and usb communication state.USB off-line state and same time of USB presence only have a state effective, and USB presence is the precondition of USB suspended state and USB state of activation.USB suspended state and same time of USB state of activation only have at most a state effective, and USB state of activation is the precondition of USB idle condition and usb communication state.USB idle condition and same time of usb communication state only have at most a state effective.
6 SD Interface status: SD off-line state, SD presence, SD suspended state, SD state of activation, SD idle condition and SD communications status.SD off-line state and same time of USB presence only have a state effective, and SD presence is the precondition of SD suspended state and SD state of activation.SD suspended state and same time of SD state of activation only have at most a state effective, and SD state of activation is the precondition of SD idle condition and SD communications status.SD idle condition and same time of SD communications status only have at most a state effective.
USB state of activation and same time of SD state of activation only have at most a state effective.
As shown in Figure 4, the present invention utilizes CPU, SD module, USB module, timer, level detection module, the hardware configurations such as universal input output pin IOA, IOB, IOC and IOD and multiplexing control module, coordinate software operation flow process, realize USB and SD interface and detect switching flow.
Illustrate specific implementation process of the present invention and step below.
While supposing energising start, do not insert SD card and USB flash disk, after start, first insert SD card and play, then insert USB flash disk and play.
After start, USB interface and SD interface are all in off-line state.Software setting enables the every 50ms of timer and produces once interruption.CPU enters after Interruption subroutine, detects the connection of USB interface and SD interface by set flow process.According to the result detecting, the state of USB interface and SD interface is set.
Insert after SD card, timer produces Interruption, and CPU carries out following detection and setting steps (as the flow process in Fig. 4):
1) flow process a detects " whether USB is in communications status ".USB, not at communications status, enters flow process b;
2) flow process b detects " whether SD is in communications status ".SD card, not at communications status, enters flow process c;
3) flow process c detects " whether USB is in idle condition ".USB, not in idle condition, enters flow process d;
4) flow process d detects " whether SD is in idle condition ".SD, not in idle condition, enters flow process e;
5) flow process e detects " whether SD is in suspended state ".SD, not in suspended state, enters flow process o;
6) flow process o detects " whether SD is online ".Now inserted SD card, SD is stuck in line, enters flow process p;
7) flow process p the inside, CPU configures multiplexing control module, the connection of setting up SD module and IOA, IOB, IOC.It is state of activation that SD interface is set, and enters flow process s;
8) exit after interruption subroutine, according to the needs of sound box system, carry out SD communication.
, then insert USB flash disk after this.Timer produces Interruption, and CPU carries out following detection and setting steps:
1) flow process a detects " whether USB is in communications status ".USB, not at communications status, enters flow process b;
2) flow process b detects " whether SD is in communications status ".If SD card, in communications status, exits interruption subroutine, waiting timer interrupts again.If SD card is not in communications status, because SD interface is activated, inevitable in idle condition, enter flow process c;
3) flow process c detects " whether USB is in idle condition ".USB, not in idle condition, enters flow process d;
4) flow process d detects " whether SD is in idle condition ".SD interface, in idle condition, enters flow process k;
5) flow process k detects " whether USB is in suspended state ".USB, not in suspended state, enters flow process l;
6) flow process l the inside, detecting action for fear of USB affects SD module and SD card, and SD is set to suspended state.Detect again " whether USB is online ".Now USB flash disk has inserted online, enters flow process m;
7) flow process m USB is set to after state of activation, enters flow process s;
8) exit after interruption subroutine, according to the needs of sound box system, carry out usb communication.
For first inserting USB flash disk, then insert the situation of SD card, can be with reference to said process, realize online detection and state setting.
If SD interface is in state of activation, SD card also still connects online, and when system need to be carried out SD communication, with reference to accompanying drawing 5, CPU carries out following steps:
1) whether flow process A detects SD card online.Because SD is not pulled out, enter flow process B;
2) flow process B the inside, SD interface is set to communications status.Then enter flow process C, start SD communication;
3) after SD sign off, enter flow process D;
4) flow process D SD interface is set to after idle condition, enters flow process F, exits SD communication process.
If USB interface is in state of activation, but USB flash disk is pulled out.In the time that system attempts carrying out usb communication again, with reference to accompanying drawing 6, CPU carries out following steps:
1) whether flow process (1) detects USB online.Because USB flash disk has been pulled out off-line, enter flow process (5);
2) flow process (5) USB interface is set to after off-line state, enters flow process (6), exits usb communication flow process.
Above flow process is detecting step and the stateful switchover process of the partial status of the present embodiment, can realize with reference to the process flow diagram of figure 4, Fig. 5, Fig. 6 the switching that under various conditions, USB and SD play.
Above embodiment only, for explanation design of the present invention and feature, can not limit protection scope of the present invention with this, and all equivalences that essence is done according to the present invention change or modify, within should being included in the protection domain of patent of the present invention.
The present invention switching field that can be applicable to communicate by letter.
Claims (7)
1. a USB and SD interface multiplexing circuit, comprise MCU, USB interface and SD interface, described MCU comprises CPU, USB module, SD module, timer and level detection module, described USB interface comprises the first data pin and the second data pin, SD interface comprises command pin, clock pin, data pin and insertion detect pin, it is characterized in that: described MCU also comprises the first pin, the second pin, the 3rd pin and the 4th pin, described clock pin is connected with described the first pin, described data pin is connected with described the second pin, described command pin is connected with described the 3rd pin, described insertion detects pin and is connected with the 4th pin, described the first data pin and described the second data pin and described the first pin, described the second pin is connected with any two pins in described the 3rd pin, in described MCU, also embed and have multiplexing control module, one end of described multiplexing control module respectively with described USB module, described SD module is connected with described level detection module, the other end respectively with described the first pin, described the second pin, described the 3rd pin is connected with described the 4th pin, described multiplexing control module is for the state-detection result to USB interface and SD interface according to described level detection module, connection status to described USB interface and described SD interface and described MCU is switched, make MCU carry out USB or SD communication, wherein, described USB interface and described SD interface only have a state effective at one time.
2. USB according to claim 1 and SD interface multiplexing circuit, is characterized in that: described the first pin, described the second pin, described the 3rd pin and described the 4th pin are universal input output pin.
3. the multiplexing method of a USB as claimed in claim 1 and SD interface multiplexing circuit, it is characterized in that, the method comprises that USB and SD interface detect switch step, usb communication step and SD communication steps, described USB and SD interface detect in switch step, described level detection module detects the communications status of SD or USB, when SD or USB are in communications status, keep communications status; Otherwise according to testing result, described multiplexing control module makes MCU communicate by letter with SD, or MCU and usb communication.
4. the multiplexing method of USB according to claim 3 and SD interface multiplexing circuit, it is characterized in that: described USB interface comprises USB off-line state, USB presence, USB suspended state, USB state of activation, USB idle condition and usb communication state, described SD interface comprises SD off-line state, SD presence, SD suspended state, SD state of activation, SD idle condition and SD communications status.
5. the multiplexing method of USB according to claim 4 and SD interface multiplexing circuit, is characterized in that, it is as follows that described USB and SD interface detect switch step:
1) described timer produces communication disruption request to described CPU with Fixed Time Interval t, and described CPU enters Interruption subroutine, and wherein time t is random time value;
Interruption subroutine flow process:
(a) if USB, in communications status, exits interruption subroutine; Otherwise, carry out step b;
(b) if SD, in communications status, exits interruption subroutine; Otherwise, carry out step c;
(c) if USB, in idle condition, carries out step g; Otherwise, carry out steps d;
(d) if SD, in idle condition, carries out step k; Otherwise, carry out step e;
(e) if SD, in suspended state, carries out step f; Otherwise, carry out step o;
(f) if USB, in suspended state, exits interruption subroutine; Otherwise, carry out step q;
(g) if SD, in suspended state, exits interruption subroutine; Otherwise, carry out step h;
(h) level detection module detects the level of the 4th pin; Judge that according to the testing result of level detection module whether SD interface is online; If online, carry out step I; Otherwise carry out step j;
(i) USB interface is set to suspended state, then disconnects the connection of USB module and pin by multiplexing control module, sets up the connection of SD module and the first pin, the second pin and the 3rd pin simultaneously; SD is set to, after state of activation, exit interruption subroutine;
(j) SD is set to, after off-line state, exit interruption subroutine;
(k) if USB, in suspended state, exits interruption subroutine; Otherwise, carry out step l;
(l) SD is set to suspended state; Disconnect the connection of SD module and the first pin, the second pin and the 3rd pin by multiplexing control module; Level detection module detects the level of the first data pin and the second data pin; Judge that according to the testing result of level detection module whether USB interface is online; If online, carry out step m; Otherwise, carry out step n;
(m) USB is set to, after state of activation, exit interruption subroutine;
(n) set up the connection of SD module and the first pin, the second pin and the 3rd pin by multiplexing control module; SD is set to state of activation; USB is set to, after off-line state, exit interruption subroutine;
(o) level detection module detects the level of the 4th pin, judges that according to the testing result of level detection module whether SD interface is online; If online, carry out step p; Otherwise carry out step f;
(p) set up the connection of SD module and the first pin, the second pin and the 3rd pin by multiplexing control module; SD is set to, after state of activation, exit interruption subroutine;
(q) level detection module detects the level of the first data pin and the second data pin; Judge that according to the testing result of level detection module whether USB interface is online; If online, carry out step r; Otherwise exit interruption subroutine;
(r) set up the connection of USB module and universal input output pin by multiplexing control module; USB is set to, after state of activation, exit interruption subroutine.
6. the multiplexing method of USB according to claim 4 and SD interface multiplexing circuit, is characterized in that, described usb communication step is as follows:
(1) level detection module detects the level of the first data pin and the second data pin, judges that according to the testing result of level detection module whether USB interface is online; If online, carry out step (2), otherwise carry out step (5);
(2) USB is set to after communications status, carries out step (3);
(3) carry out usb communication; Complete after communication, carry out step (4);
(4) USB is set to after idle condition, exits usb communication flow process;
(5) USB is set to after off-line state, exits usb communication flow process.
7. the multiplexing method of USB according to claim 4 and SD interface multiplexing circuit, is characterized in that, described SD communication steps is as follows:
(A) level detection module detects the level of the 4th pin, judges that according to the testing result of level detection module whether SD interface is online; If online, carry out step (B), otherwise carry out step (E);
(B) SD is set to after communications status, carries out step (C);
(C) carry out SD communication; Complete after communication, carry out step (D);
(D) SD is set to after idle condition, exits SD communication process;
(E) SD is set to after off-line state, exits SD communication process.
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| CN109904647A (en) * | 2017-12-08 | 2019-06-18 | 西部数据技术公司 | Memory card pin layout for avoiding conflicting in combination card connector slot |
| CN111758088A (en) * | 2020-02-07 | 2020-10-09 | 深圳市汇顶科技股份有限公司 | Method for downloading firmware by chip and chip |
| CN112286854A (en) * | 2020-10-12 | 2021-01-29 | 杭州德旺信息技术有限公司 | Multiplexing system, method and storage medium for UART interface and SPI interface |
| CN112968712A (en) * | 2021-01-29 | 2021-06-15 | 维沃移动通信有限公司 | Electronic device and control method thereof |
| CN113703353A (en) * | 2021-07-28 | 2021-11-26 | 中国铁道科学研究院集团有限公司通信信号研究所 | Redundancy control and redundancy communication method and system applied to train tail equipment |
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| CN113703353A (en) * | 2021-07-28 | 2021-11-26 | 中国铁道科学研究院集团有限公司通信信号研究所 | Redundancy control and redundancy communication method and system applied to train tail equipment |
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