CN217932696U

CN217932696U - Wireless WIFI communication device

Info

Publication number: CN217932696U
Application number: CN202222277021.0U
Authority: CN
Inventors: 雷喆; 王光瑞
Original assignee: Shaanxi Ritai Communication Equipment Engineering Co ltd
Current assignee: Shaanxi Ritai Communication Equipment Engineering Co ltd
Priority date: 2022-08-29
Filing date: 2022-08-29
Publication date: 2022-11-29
Anticipated expiration: 2032-08-29

Abstract

The utility model belongs to the technical field of communication equipment, and discloses a wireless WIFI communication device, which comprises a WIFI module and a serial level conversion chip; the WIFI module is integrated with a multi-channel buffer serial port and a static random access memory; MDRA and MFSRA pins of the multichannel buffering serial port are connected with a TXD pin of the serial level conversion chip; and the MDXA pin of the multi-channel buffering serial port is connected with the RXD pin of the serial level conversion chip. The utility model fully utilizes the internal resources of the DSP, does not need to externally expand the peripheral equipment, and only needs to externally expand the universal asynchronous level serial chip UART for matching the TTL level signal of the DSP with the level of the RS232 level signal in the occasion of serial communication; a direct channel between a mobile phone end and an SRAM is established by utilizing a peripheral DMA of the DSP, and the transfer is not required to be processed by a CPU.

Description

Wireless WIFI communication device

Technical Field

The utility model belongs to the technical field of communications facilities, especially, relate to a wireless WIFI communication device.

Background

Currently, the common communication methods are divided into two types: serial and parallel, the difference being that the bits encoded by a parallel character are transmitted simultaneously, and the serial transmission sends the bits that make up the character to the line serially. The communication cost of the parallel transmission is high, and the communication cost of the serial transmission is also low. The number of parallel transmission pins is large, and the number of serial transmission pins is small.

And (3) parallel transmission: each bit of the character code is transmitted simultaneously. The method is characterized in that: (1) The transmission speed is high, one character can be transmitted within one bit time, and 8-bit data can be transmitted out at one time through the parallel port;

(2) The communication cost is high, each bit of transmission requires a separate channel to support; thus if a character contains 8 binary bits, parallel transmission requires support of 8 independent channels; (3) Long-distance transmission is not supported, and due to capacitance induction between channels, the reliability is low during long-distance transmission. (4) stitching: the number of the pins is large. (5) use: the interface is used for printers, scanners and the like.

Serial transmission: the bits that make up a character are sent serially to the line. (1) The transmission speed is low, one bit at a time, and the transmission mode of the serial port is that data is arranged in a line and one bit is sent out and received; (2) the communication cost is lower, and only one channel is needed; (3) Long-distance transmission is supported, and the transmission modes used in the current computer network are serial transmission; (4) stitching: the number of stitches is small; (5) use: only used as a control interface; there are two transmission modes for serial transmission: 1) Synchronous transmission 2) asynchronous transmission.

The conventional serial communication mode is realized by utilizing an SCI peripheral of an embedded processor, can be only suitable for simple application, but has obvious low efficiency under the condition of high real-time requirement. In addition, the logic timing of the SCI peripheral is fixed and cannot be changed, and when the format of the serial data protocol changes, the requirement cannot be met.

Through the above analysis, the problems and defects of the prior art are as follows:

the existing serial communication mode is not suitable for the situation with high real-time requirement, the logic time sequence of the SCI peripheral is fixed, the change can not be changed according to different requirements, and the requirement can not be met when the format of a serial data protocol is changed.

SUMMERY OF THE UTILITY MODEL

To the problem that prior art exists, the utility model provides a wireless WIFI communication device.

The utility model discloses a realize like this, a wireless WIFI communication device is provided with:

WIFI module and serial level conversion chip.

The WIFI module is integrated with a multi-channel buffer serial port (McBSP) and a Static Random Access Memory (SRAM);

MDRA and MFSRA pins of the multichannel buffering serial port are connected with a TXD pin of the serial level conversion chip;

and the MDXA pin of the multi-channel buffering serial port is connected with the RXD pin of the serial level conversion chip.

Further, a CH _ PD pin and a VDD pin of the WIFI module are both connected with a 3.3V power supply and grounded.

Further, a pull-up resistor R21 is connected between a CH _ PD pin of the WIFI module and the 3.3V power supply.

Further, a capacitor C40 is connected between the CH _ PD pin and the VDD pin of the WIFI module and the ground point.

Further, a GPIO15 pin of the WIFI module is connected with a ground wire.

With the above technical solution and the technical problem solved, please analyze the following aspects and advantages of the technical solution to be protected of the present invention are:

first, to the technical problem that above-mentioned prior art exists and the degree of difficulty of solving this problem, combine closely the utility model discloses an in-process result and data etc. of technical scheme and the research and development that will protect, analyze in detail, deeply the utility model discloses technical problem that technical scheme how solved, some that bring after the solution problem possess creative technological effect. The specific description is as follows:

the utility model discloses make full use of DSP internal resource, need not the external peripheral hardware that expands, when the occasion that needs serial communication if with PC or the serial WIFI module communication of cell-phone, only need expand a general asynchronous level serial chip UART outward for with the TTL level signal of DSP and the level matching of RS232 level signal. Inside the DSP, the DMA controller manages the bi-directional communication between the McBSP, which can be flexibly configured by software to the function of the serial timing logic to suit the particular needs, and the SRAM.

The utility model discloses utilized DSP's peripheral hardware-DMA (direct memory access) to establish a cell-phone end and SRAM (the inside static memory of DSP) direct channel, need not to handle the switching through CPU. The utility model provides a need not to change chip and very effectual extension method, be worth reference.

The second, regard technical scheme as a whole or from the angle of product, the utility model discloses technical effect and advantage that technical scheme to protect possessed, the concrete description is as follows:

the utility model discloses utilize DMA and McBSP peripheral hardware to carry out serial communication, can reach the advantage of the flexibility of efficient, the arbitrary design of sequential logic.

Drawings

Fig. 1 is a circuit connection diagram of a wireless WIFI communication device according to an embodiment of the present invention;

fig. 2 is a schematic diagram of the connection of the wireless WIFI communication device provided by the embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

1. Illustrative embodiments are explained. This section is an explanatory embodiment for expanding the technical solutions of the claims so as to make those skilled in the art fully understand how to implement the present invention.

As shown in fig. 1, a WIFI module in a wireless WIFI communication device provided by the embodiment of the present invention is integrated with a multi-channel buffer serial port (McBSP) and a Static Random Access Memory (SRAM); MDRA and MFSRA pins of the multi-channel buffer serial port are connected with a TXD pin of a serial level conversion chip UART; the MDXA pin of the multi-channel buffer serial port is connected with the RXD pin of the serial level conversion chip.

The embodiment of the utility model provides an in CH _ PD pin and the VDD pin of WIFI module all with 3.3V power connection and ground connection.

The embodiment of the utility model provides an between CH _ PD pin and the 3.3V power of WIFI module be connected with pull-up resistance R21.

The embodiment of the utility model provides an between the CH _ PD pin of WIFI module and VDD pin and the ground point be connected with electric capacity C40.

The embodiment of the utility model provides an in GPIO15 pin and the ground wire of WIFI module be connected.

The utility model discloses a theory of operation is: the utility model discloses outside the DSP, only need outer UART serial level conversion chip that expands, signal line connects very simply, and UART's sending terminal Tx is connected to McBSP's MDRA and MFSRA pin, and one of these two pins is the receipt data end, and one is the receipt frame synchronization end. The Rx of the UART is connected to the MDXA pin of the McBSP, which is the transmit data terminal. For McBSP, the synchronization mode is always operated regardless of the external connection. The utility model discloses a simulate into asynchronous communication synchronous serial communication, set up the clock frequency that McBSP sent and received data into 16 times of UART send-receive baud rate, each frame that McBSP transmitted contains 10 characters promptly, a start bit and a stop bit, 8 data bit in addition expand 16 sub-positions with per 1 bit, and each frame is exactly 10 like this 16 characters. The UART serial port start bit is used as a frame synchronization signal of the McBSP receiving data by utilizing the characteristic that the UART serial port start bit is low level. Meanwhile, frame receiving synchronous signals after the first word are ignored, so that interference of data after the start bit on the frame synchronous signals is prevented, and reliable data transmission between the DSP and the mobile phone APP is realized.

2. Application examples. In order to prove the creativity and the technical value of the technical scheme of the invention, the part is the application example of the technical scheme of the claims on specific products or related technologies.

The utility model discloses can be used for the cell-phone to pass through and carry out the communication between wireless WIFI and the DSP. The TXD pin of the E103-W01 module chip need only be connected to the MDRA and MFSRA pins of the DSP and the RXD pin of the E103-W01 module chip need only be connected to the MDXA pin of the DSP. The circuit implementation is very simple.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be covered within the protection scope of the present invention by those skilled in the art within the technical scope of the present invention.

Claims

1. The utility model provides a wireless WIFI communication device which characterized in that, wireless WIFI communication device is provided with:

the WIFI module and the serial level conversion chip are arranged on the WIFI module;

the WIFI module is integrated with a multi-channel buffer serial port and a static random access memory;

the MDRA and MFSRA pins of the multi-channel buffer serial port are connected with the TXD pin of the serial level conversion chip;

and an MDXA pin of the multi-channel buffering serial port is connected with an RXD pin of the serial level conversion chip.

2. The WIFI communication device as claimed in claim 1, wherein the CH _ PD pin and the VDD pin of the WIFI module are connected to a 3.3V power source and grounded.

3. The WIFI communication device as claimed in claim 1, wherein a pull-up resistor R21 is connected between the CH _ PD pin of the WIFI module and the 3.3V power supply.

4. The WIFI communication apparatus as claimed in claim 1, wherein a capacitor C40 is connected between the pin CH _ PD and the pin VDD of the WIFI module and the ground point.

5. The WIFI communication device as claimed in claim 1, wherein GPIO15 pin of the WIFI module is connected to ground.