CN104142839A

CN104142839A - Method for avoiding initialization failure of audio frequency chip

Info

Publication number: CN104142839A
Application number: CN201410335523.1A
Authority: CN
Inventors: 翁宇扬; 刘达新; 张裁会
Original assignee: Huizhou Desay SV Automotive Co Ltd
Current assignee: Huizhou Desay SV Automotive Co Ltd
Priority date: 2014-07-15
Filing date: 2014-07-15
Publication date: 2014-11-12
Anticipated expiration: 2034-07-15
Also published as: CN104142839B

Abstract

The invention provides a method for avoiding the initialization failure of an audio frequency chip. A pin of which the audio frequency chip can reflect an inner voltage level is subjected to voltage detection by an A/D detection function so as to judge whether the audio frequency chip can achieve a charging level for the audio frequency chip to normally work; after the audio frequency chip is guaranteed to achieve the normal charging level, initialization instruction sequences are sent to the audio frequency chip through IIC (Inter IC bus) or SPI (Serial Peripheral Interface) to cause an audio frequency sequence to begin to be initialized. The SVR (support vector regression)/CREF/VREF pin voltage of the audio frequency chip can be detected to determine a timing for initializing the audio frequency chip, and therefore the problem of the unsuccessful initialization of the audio frequency chip due to unstable peripheral power supply voltage and capacitance precision deviation can be effectively avoided. In addition, the sending result of each instruction sequence is checked, a process that all instruction sequences are initialized is carried out again once one sending result fails, so that the initialization instruction sequences can be guaranteed to be sent in an established time sequence, and the audio frequency chip can be guaranteed to enter a normal working state.

Description

A kind of method that prevents that audio chip initialization was lost efficacy

Technical field

The present invention relates to audio electronics devices field, relate in particular to a kind of method that prevents that audio chip initialization was lost efficacy.

Background technology

Audio chip has a corresponding pin reflection charge inside level, as SVR pin, CREF pin, (function is identical for VREF pin, different chip call differences), the charging process of audio chip has direct relation with the capacitance size that the supply voltage of VDD is connected with SVR pin, supply voltage is less, the connected electric capacity of SVR pin is larger, and the charging deadline is longer.The common initialization mode of existing audio chip is, between development stage, using from MCU(microcontroller) be power-up to time span that audio chip SVR pin charged as to initialized time expand of audio chip, in the time that MCU brings into operation, after extending the set time, directly audio chip is carried out to initialization, and send and unsuccessfully only rely on the retransmission mechanism of IIC or SPI self to resend for initialization directive.

But the SVR pin electric capacity that is connected exists certain accuracy error in actual applications, the supply voltage of VDD also cannot ensure to immobilize because of environmental factor.For example, in the complex process starting at vehicle electronics device, on-vehicle battery voltage can produce along with the startup of certain some electron device fluctuation, supply voltage cannot remain on fixed voltage value always, add that electron device itself exists accuracy error, cannot ensure that audio chip charging process all keeps consistency.If now directly audio chip is carried out to initialization by extending after the set time, can because audio chip charge inside do not reach can duty, and cause initialization directive to send unsuccessfully or partly failed.And simply retransmit failure command by the retransmission mechanism of IIC or SPI self, and cannot ensure that audio chip carries out initialization according to set sequential, may cause voiceless sound output, afunction, adjusting audio to have the problems such as noise.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of method that prevents that audio chip initialization was lost efficacy, to avoid not determining whether audio chip reaches duty and just audio chip is started to initialization, causes the abnormal problem of audio chip function.

The present invention, for solving the problems of the technologies described above, provides a kind of method that prevents that audio chip initialization was lost efficacy, and the method comprises the steps:

Step 1: the AD mouth of microcontroller is connected to the pin that can reflect charge inside level on audio chip, and configuration enables the AD mouth of microcontroller, the communication module that initialization is corresponding;

Step 2: audio chip is resetted,

Step 3: time delay certain hour;

Step 4: read the AD mouth numerical value of microcontroller, and this numerical value is converted into the voltage data of the pin of reflection audio chip charge inside level;

Step 5: contrast charging normal magnitude of voltage in the magnitude of voltage of the pin of described reflection audio chip charge inside level and audio chip specification, if being more than or equal to audio chip specification chips, the magnitude of voltage of the pin of described reflection audio chip charge inside level charges normal voltage, enter step 6, otherwise be back to step 3;

Step 6: microcontroller sends corresponding initialization directive sequence to audio chip.

Preferably, in described step 6, also comprise: check that each initialization directive sends result, if sends successfully, carry out next instruction transmission, otherwise during any instruction transmission unsuccessful, be back to step 1.

Preferably, described in, prevent that the method that audio chip initialization was lost efficacy from also comprising:

Step 7: after all initialization directive sequences are successfully sent, initialization complement mark is set.

Step 8: after audio chip initialization completes, stop the detection to microcontroller AD mouth.

The present invention has the following advantages:

1, deciding by detecting the charge inside level of audio chip the initialization opportunity of starting, be not limited to the instability impact of electric capacity accuracy error and peripheral voltage, is the initialized important guarantee of audio chip success;

2, initialization procedure monitoring communication success or failure, and guarantee unsuccessfully to re-start afterwards initialization, but not only retransmit failed instruction, guarantee audio chip to carry out initialization by set sequential;

3, after initialization success, stop AD and detect, make, after the normal work of multimedia system, can not take the unnecessary resource of microcontroller.

Brief description of the drawings

In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, in describing embodiment below, needed accompanying drawing does simple introduction, apparently, accompanying drawing described below is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is that the hardware that the present invention program designs connects block diagram.

Fig. 2 is the process flow diagram of method provided by the present invention.

Embodiment

By reference to the accompanying drawings technical scheme of the present invention is carried out to clear, complete description below by embodiment; obviously; described embodiment is only a part of embodiment of the present invention; instead of whole embodiment; based on embodiments of the invention; those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.

One, precondition

As shown in Figure 1, after microcontroller starts, configuration enables AD mouth to the annexation of microcontroller and audio chip, initial

Change corresponding IIC or SPI communication module, configure corresponding I/O mouth.

Two, SVR pin voltage detecting

By the RST Pin Reset audio chip of audio chip, then require to reset at Reset(according to the sequential of chip specification) after audio chip time delay 50ms so that chip enters charging process.Then by reading the AD mouth numerical value of microcontroller, be converted into SVR pin voltage data according to circuit design, and with audio chip specification in charge normal magnitude of voltage and contrast, when judging that SVR pin magnitude of voltage reaches audio chip specification chips and charges normal after voltage, then start to send the corresponding initialization directive sequence of audio chip by IIC or SPI.If the voltage data of the AD mouth reading conversion reads judgement after still lower than charging normal magnitude of voltage in audio chip specification, delaying 50ms again again, with this repeatedly until reach and charge normal magnitude of voltage.

Three, communication monitoring and failure handling

Each initialization directive is sent to result and check, only having when sending result be successfully time, just carries out next instruction transmission, if during any instruction transmission unsuccessful, should reexamine charging voltage, and resend whole initialization directive sequences.After all initialization directive sequences are successfully sent, to audio chip, initialization finishes, and initialization complement mark is now set.

Four, stopping AD detecting

After audio chip initialization completes, stop the measuring ability to this AD mouth, to reduce the software resource of microcontroller.

The present invention detects the charge inside level of audio chip by AD measuring ability, thereby determines that audio chip starts initialization opportunity, has avoided the impact of the factor such as instability of electric capacity accuracy error and peripheral voltage; And check and adopt the mechanism of makeing mistakes and all reinitializing by the transmission result to each initialization directive, having ensured the correctness of initialization directive sequential.

The above embodiment has only expressed preferred embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims

1. prevent the method that audio chip initialization was lost efficacy, it is characterized in that, the method comprises the steps:

Step 2: audio chip is resetted,

Step 3: time delay certain hour;

2. a kind of method that prevents that audio chip initialization was lost efficacy as claimed in claim 1, it is characterized in that, in described step 6, also comprise: check that each initialization directive sends result, if send successfully, carrying out next instruction sends, otherwise during any instruction send unsuccessfully, be back to step 1.

3. a kind of method that prevents that audio chip initialization was lost efficacy as claimed in claim 1 or 2, is characterized in that, the method also comprises:

4. a kind of method that prevents that audio chip initialization was lost efficacy as claimed in claim 3, is characterized in that, the method also comprises: