CN105515595A - Sound-collecting method for implementing ultrasonic tactile stick radio through integrated radio chip - Google Patents

Abstract

The invention relates to the field of embedded technologies, in particular to a sound-collecting method for implementing an ultrasonic tactile stick radio through an integrated radio chip. The sound-collecting method for implementing the ultrasonic tactile stick radio through the integrated radio chip comprises the following steps: firstly, initializing an MCU (Microprogrammed Control Unit) through a program; setting a connection pin which is connected with a pin RST at high level; performing initialization setting on the chip; searching for channels by the program through a channel-searching function; during changing of chip parameters and channel searching, inquiring a state bit STC (completion of searching/adjustment) of a 0AH register needing to be inquired by the program, and judging whether or not parameter setting or channel searching is completed; calling a function for performing next searching every time after successful completion of channel searching. By adopting the sound-collecting method, the power consumption can be lowered, and the size is reduced. The radio can be embedded into an ultrasonic tactile stick.

Description

One utilizes integrated broadcast receiver chip to complete the wireless reception method of ultrasonic blind man's stick

Technical field

The present invention relates to field of embedded technology, particularly relate to one and utilize integrated broadcast receiver chip to complete the wireless reception method of ultrasonic blind man's stick.

Background technology

At present, estimate that whole world blind person has 4,000 ten thousand to 4,500 ten thousand people according to the World Health Organization.Blind person lives in darkness all one's life.Educator once did experiment and found, normal person gets extraneous information in life has about 40% to be by vision system, and 25% is obtained by auditory system, has about 17% to be obtained by the sense of touch of limbs.As can be seen here, vision system is very important for we mankind, and it can help us to obtain extraneous information, judges thing around and material object.Blind person loses vision system, also just means that they lose the passage the most importantly obtaining external information.Therefore, blind person should be helped to rely on their auditory system to obtain extraneous information.Broadcast is a kind of media by sound transmission information applied at present widely.Blind person can obtain up-to-date information easily from broadcast.

The broadcast receiver occurred the earliest is crystal receiver, and this broadcast receiver does not need power supply, and structure is simple, but its acceptance is very poor, and can only provide for a people service of listening to.Then occurred valve radio set, this broadcast receiver power consumption is large, and cost is high, volume is large, gradually replace by the transistor that occurred afterwards, although transistor solves the problem of power consumption, cost cutting is a lot, but it does not still solve bulky problem.Occurred integrated circuit broadcast receiver afterwards, this broadcast receiver greatly reduces wireless volume, reduces cost, also reduces power consumption simultaneously.This wireless appearance, makes broadcast receiver towards low-power consumption, stable, small future development.At present, broadcast receiver is widely used in automobile industry, makes the development of this technology have more diversity.Blind person be unable to do without blind man's stick in life, utilizes embedded technology to be embedded in blind man's stick by broadcast receiver, can help the real-time broadcast listening of blind person, helps blind person to obtain extraneous information, for they offer help.

Summary of the invention

For the defect existed in prior art or deficiency, technical problem to be solved by this invention is: provide one to utilize integrated broadcast receiver chip to complete the wireless reception method of ultrasonic blind man's stick, use integrated chip can reduce wireless power consumption, reduce volume, be easy to carry, can work long hours, can be embedded among ultrasonic blind man's stick.

To achieve these goals, the technical scheme that the present invention takes utilizes integrated broadcast receiver chip to complete the wireless reception method of ultrasonic blind man's stick for providing one, and the method comprises the following steps:

Steps A 1: first will carry out initialization to MCU, and the connection pin with pin RST is set to high level;

Steps A 2: Initialize installation is carried out to integrated broadcast receiver chip, in change 07H register, the value of XOSCEN is set to 1, the object of such setting is that clock module is arranged on crystal oscillator pattern, the silent mode given tacit consent in 02H register is set to 1, and ENABLE power supply position is also set to 1, the value of SPACE [1:0] position of 05H register is arranged to 01 by 00, changing the scouting interval is 100KHz, be maximum by the value of change volume, the VOLUME [3:0] of amendment 05H register is 1111;

Steps A 3: carry out tuning, completing this operation is realized by function.

As a further improvement on the present invention, described steps A 3 is realized by call function, needs the change of some parameter in MCU detection chip to have determined whether the whether success of tuning and tuning calling these two functions, comprises the following steps:

Step B1: the state byte STC(of the 0AH register of inquiry search for/has adjusted) position, judge whether to complete optimum configurations or whether tuning completes; If STC is 1, complete search, if STC is 0, do not complete;

Step B2: if STC is 1, the state byte SF/BL(then inquiring about 0AH register search for unsuccessfully/to border) and position, in order to judge whether whether successful tuning or tuning arrive wave band border; If SF/BL is 0 search success, if for SF/BL be 1, search is success not, or arrives and receive rope border, turns beginning boundary and continues to search for;

Step B3: be often successfully completed a tuning, could continue the search that call function carries out next time.

The invention has the beneficial effects as follows: the present invention enough overcomes large, the unstable shortcoming of other broadcast receiver method for designing high power consumptions, volume, is applicable to be embedded in ultrasonic blind man's stick.Experimental result shows, this method for designing can reduce power consumption, reduces volume, also can meet and be embedded in ultrasonic blind man's stick.

Accompanying drawing explanation

Fig. 1 is circuit diagram of the present invention;

Fig. 2 is the flow chart of broadcast receiver tuning of the present invention.

Embodiment

Illustrate below in conjunction with accompanying drawing and embodiment the present invention is further described.

As shown in Figure 1, the present invention adopts Si4703 integrated broadcast receiver chip to complete wireless design.The program only needs external a small amount of components and parts just can complete radio function when design, and circuit structure does not have traditional broadcast receiver complicated, and radio reception channel does not need to debug receipts platform manually.The whole function of broadcast receiver from antenna receiving signal to output sound signal is all integrated in the inside of chip, and radio function is complete.Wireless function is completed mainly by two line modes of serial communication by MCU control chip.The method uses crystal oscillator input mode, needs the crystal oscillator of external 32.768KHz and load capacitance to provide clock for chip.

Mainly apply iic bus agreement for MCU with communicating of chip, when the clock of clock cable is in high level, the signal of data line transmits by data during high step-down.Real transfer of data starts in the next low level of clock signal, and each byte of transmission can be acquired at the rising edge of clock signal.After starting transmission, first transmit control command, control command comprises 8 bytes, and first 7 of these 8 bytes are the address bits of register, and last is read/write operation position.Byte after beginning is control command.Because the output audio signal of chip is very little, need, by amplifier, audio signal is amplified in output.The method uses LM4890 audio-frequency power amplifier.Power amplifier does not need external bootstrap capacitor and coupling capacitance, is well suited for being applied in low pressure, small-sized electronic equipment.LM4890 has stable unit gain, and its unit gain can be set by external circuitry.The method can control broadcast receiver by adjustment chip parameter and adjust platform and adjustment volume.

As shown in Figure 1, it is the circuit diagram of the broadcast receiver design of ultrasonic blind man's stick, the method adopts 3.3V supply power voltage, the method uses iic bus agreement to communicate with MCU, the clock module that the method adopts is crystal oscillator and the load capacitance that therefore crystal oscillator pattern connects 32.768kHz between pin RCLK and GPO3 of chip, chip pin RST, pin SCLK are connected with pin SDIO and MCU, carry out transfer of data and control.

As shown in Figure 2, it is the flow chart of the broadcast receiver tuning of ultrasonic blind man's stick, the method needs program first will carry out initialization to MCU, and the connection pin with pin RST is set to high level, then Initialize installation is carried out to chip, in change 07H register, the value of XOSCEN is set to 1, the object of such setting is that clock module is arranged on crystal oscillator pattern, the silent mode given tacit consent in 02H register is set to 1, and ENABLE power supply position is also set to 1, the value of SPACE [1:0] position of 05H register is arranged to 01 by 00, changing the scouting interval is 100KHz, by change volume value be maximum, the VOLUME [3:0] of amendment 05H register is 1111, program carries out tuning, complete this operation to be realized by tuning function, when changing chip parameter and tuning, program needs the state byte STC(of 0AH register of inquiry search for/to adjust) position, judge whether to complete optimum configurations or whether tuning completes.If STC is 1, complete search, if STC is 0, do not complete.If STC is 1, the state byte SF/BL(then inquiring about 0AH register searches for unsuccessfully/to border) position, in order to judge whether whether successful tuning or tuning arrive wave band border.If SF/BL is 0 search success, if for SF/BL be 1, search is success not, or arrives and receive rope border, turns beginning boundary and continues to search for.Often be successfully completed a tuning, program ability call function carries out search next time.

Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.

Claims (2)

1. utilize integrated broadcast receiver chip to complete the wireless reception method of ultrasonic blind man's stick, it is characterized in that, the method comprises the following steps:

Steps A 1: first will carry out initialization to MCU, and the connection pin with pin RST is set to high level;

Steps A 2: Initialize installation is carried out to integrated broadcast receiver chip, in change 07H register, the value of XOSCEN is set to 1, the object of such setting is that clock module is arranged on crystal oscillator pattern, the silent mode given tacit consent in 02H register is set to 1, and ENABLE power supply position is also set to 1, the value of SPACE [1:0] position of 05H register is arranged to 01 by 00, changing the scouting interval is 100KHz, be maximum by the value of change volume, the VOLUME [3:0] of amendment 05H register is 1111;

Steps A 3: carry out tuning, completing this operation is realized by function.

2. according to claim 1ly utilize integrated broadcast receiver chip to complete the wireless reception method of ultrasonic blind man's stick, it is characterized in that, described steps A 3 is realized by call function, need the change of some parameter in MCU detection chip to have determined whether the whether success of tuning and tuning calling these two functions, comprise the following steps:

Step B1: the state byte STC(of the 0AH register of inquiry search for/has adjusted) position, judge whether to complete optimum configurations or whether tuning completes; If STC is 1, complete search, if STC is 0, do not complete;

Step B2: if STC is 1, the state byte SF/BL(then inquiring about 0AH register search for unsuccessfully/to border) and position, in order to judge whether whether successful tuning or tuning arrive wave band border; If SF/BL is 0 search success, if for SF/BL be 1, search is success not, or arrives and receive rope border, turns beginning boundary and continues to search for;

Step B3: be often successfully completed a tuning, could continue the search that call function carries out next time.