CN101729924A - HDMI-CEC detection device - Google Patents
HDMI-CEC detection device Download PDFInfo
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- CN101729924A CN101729924A CN200910188786A CN200910188786A CN101729924A CN 101729924 A CN101729924 A CN 101729924A CN 200910188786 A CN200910188786 A CN 200910188786A CN 200910188786 A CN200910188786 A CN 200910188786A CN 101729924 A CN101729924 A CN 101729924A
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Abstract
The invention provides an HDMI-CEC detection device, which comprises an MCU, a display unit connected with the MCU, a key input unit, a storage unit, an alarm unit connected with the MCU, a CEC signal receiving detection unit, and a CEC signal output control unit. The HDMI-CEC detection device provided by the invention can quickly detect an HDMI in real time, and can conveniently and quickly detect uncontrolled equipment to facilitate normal use of a user. The HDMI-CEC detection device provided by the invention also can be conveniently used for performance detection of finished products in a production line of a factory to ensure the quality of the products.
Description
Technical field
The present invention relates to HDMI (High-definition Digital Multimedia Interface, High-definition DigitalMultimedia Interface) field, relate in particular to the signal testing technology of HDMI-CEC (electronic equipment for consumption control).
Background technology
Along with the continuous increase of family digital product type, the equipment that can be connected with Digital Television is also more and more, and the various interface standard is also weeded out the old and bring forth the new thereupon.Wherein, HDMI is one of interfacing of comparison hot topic, and supports the digital broadcasting technology of high-definition digital multimedia interface electronic equipment for consumption control (HDMI-CEC) function also to begin gradually to use and popularize.Interconnect the network system of composition based on a plurality of HDMI devices of HDMI-CEC function, apparent in view advantage is to control all HDMI equipment in the lump by the control main equipment, finish the multi-remote-controller epoch of a machine one control, very simple and convenient for the user.Yet, how to guarantee that used equipment can both support the communication requirement of HDMI-CEC normally, this is that prior art does not have fine solution: because the electrical property difference of the basic network agreement that temporal information difference between the various device or level signal do not satisfy HDMI, these all might cause certain or some equipment of network can't satisfy the control needs.
Summary of the invention
The purpose of this invention is to provide a kind of HDMI-CEC checkout equipment, be intended to solve the technological deficiency that prior art can not monitoring and detection HDMI equipment performance.
HDMI-CEC checkout equipment provided by the invention comprises that MCU receives detecting unit, CEC signal output control unit with the display unit that is connected with MCU, key-press input unit, memory cell, the alarm unit that is connected with MCU, CEC signal.
More specifically, described CEC signal reception detecting unit comprises the comparison circuit that the input signal amplitude is monitored.
More specifically, described comparison circuit comprises that the signal of received signal receives whether normal input pin of signal sequence that pin and detection receive and signal amplitude, and above-mentioned pin is connected with MCU.
More specifically, described CEC signal output control unit comprises the operational amplification circuit of the signal compatibility that detects Devices to test.
More specifically, described operational amplification circuit comprises that the signal that sends signal sends the signal controlling pin of the level magnitude of pin and control transmission signal, and above-mentioned pin is connected with MCU.
More specifically, described alarm unit is a buzzer.
More specifically, described memory cell is a nonvolatile memory.
More specifically, described nonvolatile memory is EEPROM.
More specifically, described HDMI-CEC checkout equipment further comprises the HDMI-CEC bus that connects detected equipment.
HDMI-CEC checkout equipment provided by the invention can carry out real-time detection fast to HDMI, can conveniently detect equipment not controlled in the system on the one hand, the digital signal that guarantees each equipment can both be in the scope of HFMI protocol requirement, and guarantee that every kind of equipment can both normally receive all information in the specification area covered by agreement, user friendly normal use; Also can be widely used on the plant produced line Performance Detection on the other hand easily to finished product machine.
Description of drawings
Fig. 1 is the structural representation of the HDMI-CEC checkout equipment that relates to of preferred embodiment of the present invention;
Fig. 2 is the schematic diagram that the present invention tests the HDMI-CEC performance of DVD player;
Fig. 3 is the structural representation of the HDMI cable that the present invention relates to.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Shown in Fig. 1, the HDMI-CEC checkout equipment that preferred embodiment of the present invention provides comprises that display unit 10, key-press input unit 11, alarm unit 12, memory cell 13, MCU (microcontroller) 14, CEC signal receive detecting unit 15, CEC signal output control unit 16.
The CEC signal content that display unit 10 is used for receiving shows, and is concrete, can comprise concrete command context and content of parameter with the signal that receives according to the mapping of HDMI CEC command list and be shown as ASCII character.Simultaneously, display unit 10 also can show the UI interface when programming is provided with.
Key-press input unit 11 is mainly used in the input of finishing the CEC order, the processes such as programming input of CEC control signal.
Alarm unit 12 is mainly used in and detects the CEC signal and warning when unusual occurs, and the explicit declaration that can use buzzer to add the LED lamp is to send unusual that signal or received signal occur.
Memory cell 13 (for example adopting EEPROM) is used for the preservation of program parameters, adopts nonvolatile memory can play the effect of power down protection.
The work of each unit of MCU14 control system.
In the present embodiment, the CEC signal receives detecting unit 15 and adopts 150 pairs of input signal amplitudes of comparison circuits to monitor (being linked into tested equipment by HDMI CEC bus), and to exceed normal range of operation (low: 0～0.6V when detected signal value; High: as in the time of 2.8～3.6V), then to start alarm unit 12 and send warning signal (buzzer), and can start LED simultaneously and carry out alarm indication, to remind operating personnel by MCU14.The pinout of comparison circuit 150 is:
Prd---signal receives pin, is used for the reception of Data signal
Whether Prc---input pin, it is normal to be used to detect the Data signal amplitude that receives.Wherein:
The 0-input signal is in effective range;
The 1-input signal exceeds effective range, is invalid signals.
The 26S Proteasome Structure and Function of comparison circuit 150 is that those skilled in the art can be readily appreciated that in this area, does not give unnecessary details at this.
CEC signal output control unit 16 adopts operational amplification circuit 160 to detect the signal compatibility of Devices to test, and major programme is to test when the high-low level of HDMI CEC signal all is in the limit amplitude signal reception of receiving system.The pinout of operational amplification circuit 160 is:
Psd---signal sends pin, is used for the transmission of Data signal;
Psc---signal controlling pin is used to control the level magnitude that sends signal; Wherein
The 1-output level is high: 3.6V is low: 0V
The 0-output level is high: 2.8V is low: 0.6V
Pcs---be used for control and whether allow Psc work, its output level implication is:
1-allows Psc work
0-forbids Psc work, and the signal of output this moment is with height: 3.3V, and is low: 0.3V output.
The 26S Proteasome Structure and Function of operational amplification circuit 160 is that those skilled in the art can be readily appreciated that in this area, does not give unnecessary details at this.
Shown in Fig. 2, suppose above-mentioned HDMI-CEC checkout equipment is linked in Digital Television and the DVD equipment, Digital Television is connected by HDMI cable (HDMI cable) with DVD equipment, shown in Fig. 3, HDMI cable comprises CEC line, Hot Plug Detect Line, DDC/CEC Ground, HDCP differential signal line etc., and HDMI-CEC checkout equipment of the present invention can be realized following function:
1, sets the high-low level limit sequential transmission combination of logic zero signal and logical one signal, detect the signal sequence logical compatibility of Devices to test.
2, in logic zero signal and logical one signal process, artificially make spike, check the signal anti-interference of Devices to test.
3, send Start Bit sequential not in critical field, detect the validity of Devices to test signal.
4, send the CEC order of logical zero or logical one mistake sequential, detect the validity of Devices to test signal.
5, send wrong CEC command word, detect the validity of Devices to test signal.
6, send the HDMI CEC order of correct sequential, detect Devices to test to the validity of signal and reply.
7, by combining with amplitude test, the test Devices to test is to the validity of signal and reply.
8, control is replied, the retransmission mechanism of test Devices to test and the error handling processing of not having Devices to test when responding.
9, the test pattern of the above various combination of button input programmed settings also can be set CEC bid value and the parameter that need send at random, the error handling processing of test Devices to test.
10, the HDMI CEC controlling mechanism of analog TV equipment, response is as the CEC answering system and the CEC control flow of equipment such as DVD Player.
11, equipment such as analog D VD Player, the HDMI CEC control protocol of test television set.
12, only as watch-dog, all the HDMI signals on the monitoring HDMI CEC Line, and be presented at fast on the display screen, whether the HDMI CEC agreement of test macro occurs unusually.
13, all programmings are provided with and all can be stored in the last and locking programming of EEPROM.This function can be applicable on the production line, when producing HDMI CEC equipment in enormous quantities, whether on-line quick detection HDMI CEC signal basic function is normal, and can guarantee has enough good signal compatibility through the product that HDMI-CEC checkout equipment of the present invention detected.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the protection range of claim of the present invention.
Claims (9)
1. HDMI-CEC checkout equipment, comprise MCU and the display unit that is connected with MCU, key-press input unit, memory cell, it is characterized in that further comprising: the alarm unit that is connected with MCU, CEC signal receive detecting unit, CEC signal output control unit.
2. HDMI-CEC checkout equipment according to claim 1 is characterized in that, described CEC signal receives detecting unit and comprises the comparison circuit that input signal sequential and amplitude are monitored.
3. HDMI-CEC checkout equipment according to claim 2 is characterized in that, described comparison circuit comprises that the signal of received signal receives whether normal input pin of signal amplitude that pin and detection receive, and above-mentioned pin is connected with MCU.
4. HDMI-CEC checkout equipment according to claim 1 is characterized in that, described CEC signal output control unit comprises the operational amplification circuit of the signal compatibility that detects Devices to test.
5. HDMI-CEC checkout equipment according to claim 4 is characterized in that, described operational amplification circuit comprises that the signal that sends signal sends the signal controlling pin of the level magnitude of pin and control transmission signal, and described pin is connected with MCU.
6. HDMI-CEC checkout equipment according to claim 1 is characterized in that, described alarm unit is a buzzer.
7. HDMI-CEC checkout equipment according to claim 6 is characterized in that, described memory cell is a nonvolatile memory.
8. HDMI-CEC checkout equipment according to claim 7 is characterized in that, described nonvolatile memory is EEPROM.
9. HDMI-CEC checkout equipment according to claim 1 is characterized in that, described HDMI-CEC checkout equipment further comprises the HDMI-CEC bus that connects detected equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910188786A CN101729924A (en) | 2009-12-11 | 2009-12-11 | HDMI-CEC detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910188786A CN101729924A (en) | 2009-12-11 | 2009-12-11 | HDMI-CEC detection device |
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| CN101729924A true CN101729924A (en) | 2010-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910188786A Pending CN101729924A (en) | 2009-12-11 | 2009-12-11 | HDMI-CEC detection device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895785A (en) * | 2010-07-01 | 2010-11-24 | 广东欧珀电子工业有限公司 | Portable HDMI CEC automatic testing device and testing method thereof |
| CN105163113A (en) * | 2015-09-29 | 2015-12-16 | 深圳市九洲电器有限公司 | HDMI interface testing clamp and method |
| CN105893203A (en) * | 2016-03-30 | 2016-08-24 | 福州瑞芯微电子股份有限公司 | CEC verification method and device |
| CN106789472A (en) * | 2016-12-27 | 2017-05-31 | 北京小米移动软件有限公司 | Consumer electronics control CEC function detecting methods, apparatus and system |
-
2009
- 2009-12-11 CN CN200910188786A patent/CN101729924A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895785A (en) * | 2010-07-01 | 2010-11-24 | 广东欧珀电子工业有限公司 | Portable HDMI CEC automatic testing device and testing method thereof |
| CN105163113A (en) * | 2015-09-29 | 2015-12-16 | 深圳市九洲电器有限公司 | HDMI interface testing clamp and method |
| CN105893203A (en) * | 2016-03-30 | 2016-08-24 | 福州瑞芯微电子股份有限公司 | CEC verification method and device |
| CN106789472A (en) * | 2016-12-27 | 2017-05-31 | 北京小米移动软件有限公司 | Consumer electronics control CEC function detecting methods, apparatus and system |
| CN106789472B (en) * | 2016-12-27 | 2019-12-13 | 北京小米移动软件有限公司 | Consumer electronic control CEC function detection method, device and system |
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Open date: 20100609 |