CN103024376A - Ethernet-based embedded video transmission module - Google Patents

Abstract

The invention discloses an Ethernet-based embedded video transmission module. The module comprises a master control module, a peripheral circuit of the master control module, an Ethernet communication module, a video data acquisition module and a power module, wherein the master control module is composed of an advanced RISC machine (ARM) processor chip, 12MHz crystal, a 32.768KHz crystal, a reset circuit and a peripheral circuit; the Ethernet communication module is composed of a network transformer, a network chip of an integrated physical layer (PHY), and an RJ45 network interface; a network signal and an on-chip communication signal are isolated from each other through the network transformer; the video data acquisition module is composed of a universal serial bus (USB) equipment interface and an external camera; and a video signal in an industrial scene is converted into an industrial Ethernet signal to form a basic component of an industrial Ethernet for online video display. Therefore, a remote user can conveniently access and monitor the running condition of a field system through a host computer.

Description

Embedded video transport module based on Ethernet

Technical field

The present invention relates to video transmission module, particularly a kind of embedded video transport module based on Ethernet.

Background technology

Video monitoring is praised highly by increasing people with its intuitive and reliable, economical and practical characteristics.The video of industrial control field can help control operation, maintenance, repairing, training and factory work, and in order to reduce downtime, adopting the Ethernet with video bandwidth is the key tool that realizes the industrial control field video monitoring.

If will be based on the video monitoring information accessing Internet of environment, can put together the information of disperseing, show in real time and store, for the monitor staff provides in real time, vision picture intuitively, thereby be convenient to unified management.

Video monitoring not only is confined to safety precaution, but become a kind of to the effective supervision means of all trades and professions, it is widely used in many fields with characteristics directly perceived, convenient, that the information content is abundant, such as education, government, hospital, hotel, urban public security etc., be widely used in the Real Time Monitoring of industrial or agricultural, traffic, electric power etc.

Summary of the invention

The objective of the invention is for the deficiencies in the prior art, in order to make things convenient for the industry spot monitoring, convenient to monitoring on-the-spot supervision and maintenance, a kind of embedded video transport module based on Ethernet is provided, realization is converted to the Industrial Ethernet signal with the vision signal at scene, be transferred to server, and then carry out upper monitoring.

The technical solution used in the present invention is: comprise main control module and peripheral circuit thereof, ethernet communication module, video data acquiring module, power module based on the embedded video transport module of Ethernet, it is characterized in that: main control module is made of arm processor chip, 12MHz crystal, 32.768KHz crystal, reset circuit, standard jtag circuit;

The ethernet communication module is made of network chip and the RJ45 network interface of network transformer, integrated PHY layer, the ethernet communication module links to each other with the arm processor chip by the MII interface, network transformer is connected with network chip, RJ45 network interface respectively, realizes the isolation of network signal and Communication signal by network transformer; The video data acquiring module is made of USB device interface and external camera, and the video data acquiring module links to each other by USB interface with the arm processor chip; Power module provides power supply for ethernet communication module and arm processor chip;

Arm processor chip in the described main control module is the LPC1768 microprocessor of NXP company: the operating voltage of main circuit module is 3.3V; The standard jtag circuit links to each other with the arm processor chip, is used for the on-line debugging of circuit;

Network chip in the described ethernet communication module is DP83848I; Network transformer is HR911105A, and network transformer HR911105A is connected with network chip DP83848I, RJ45 network interface respectively; The main circuit module power supply obtains+the 24V power supply by RJ45 network interface 4,5 pin of RJ45 netting twine from industrial switch, obtains GND from 7,8 pin;

Described video acquisition module adopts USB Device interface to link to each other with the USB peripheral hardware of arm processor, for preventing overcurrent to the damage of circuit, connects USB overcurrent protection chip LM3268M-L between arm processor and USB interface;

Described power module adopts bus 24V power supply, utilizes the EUP3410 chip that the 24V power supply of bus is converted to 5V, and recycling SG2001-3.3V chip is the 3.3V fixed voltage with the 5V voltage transitions, is arm processor chip and network chip power supply;

The prefabricated software systems of arm processor chip LPC1768 are transplanted embedded OS uC/OS-II and built-in network ICP/IP protocol stack, realize the communication of Ethernet, adopt the programmed method of multitask, the field video signal that gathers is compressed with Ethernet transmit.

The invention has the beneficial effects as follows: the vision signal of industry spot is converted to the Industrial Ethernet signal, consists of the basic element of character of Industrial Ethernet, be convenient to realize that remote subscriber conducts interviews to fielded system ruuning situation by host computer and monitors.

Description of drawings

Fig. 1 is circuit structure block diagram of the present invention;

Fig. 2 is arm processor chip circuit of the present invention;

Fig. 3 is network chip and the peripheral circuit thereof of integrated PHY layer of the present invention;

Fig. 4 is usb circuit of the present invention;

Fig. 5 is power circuit of the present invention;

Fig. 6 is software flow pattern of the present invention.

Embodiment

For a more clear understanding of the present invention, describe in conjunction with the accompanying drawings and embodiments the present invention in detail:

Shown in Fig. 1 to 5, mainly consisted of by the network chip of the arm processor chip LPC1768 with ethernet mac layer and USB Device communication equipment, reset circuit, standard jtag circuit, integrated PHY layer and peripheral circuit thereof, usb circuit, power circuit based on the embedded video transport module of Ethernet.

The operating voltage of main circuit module is 3.3V, and arm processor chip VDDIO end input voltage is 3.3V; Reset key links to each other with the reseting interface of arm processor chip; The standard jtag circuit is realized artificial debugging and program download by connecting arm processor chip LPC1768; The network chip of integrated PHY layer is DP83848I, and its external crystal oscillator is 50MHz; Arm processor chip CPU communicates by letter by Interface realization with network chip DP83848I; Network transformer HR911105A is connected with network chip DP83848I, the RJ45 network interface of integrated PHY layer respectively; The arm processor chip links to each other with USB overcurrent protection chip LM3268M-L, for USB Device interface provides power supply protection; The arm processor chip connects USB Device interface, and interface connects camera, collection site image; Circuit utilizes EUP3410 and SG2001-3.3V chip that voltage is changed by bus-powered, is main control module, ethernet communication module and video data acquiring module for power supply.

As shown in Figure 2, be the arm processor chip circuit, adopt the LPC1768 microprocessor of NXP company, this is a ARM chip that is integrated with ethernet mac layer and USB Device interface.The operating voltage of whole chip is 3.3V.The crystal oscillator of CPU adopts 12MHz, and the RTL clock adopts 32.768KHz.Artificial debugging partly adopts the jtag circuit of standard, can debug and download.The reset key circuit is by the level operation of button, and network chip and the jtag circuit of arm processor, integrated PHY layer resetted.

As shown in Figure 3, be the network transmitting portion of video acquisition signal, wherein DP83848I is the network chip of integrated PHY layer, and its external crystal oscillator is 50MHz, and it is connected with LPC1768 by interface.HR911105A is network transformer, and it is connected with HR911105A with the RJ45 network interface respectively.4,5 pin of the network interface of RJ45 obtain the 24V power supply by industrial switch, and 7,8 pin also link to each other with industrial switch and obtain GND, realize bus-powered.

As shown in Figure 4; be usb circuit; the USB enable signal of arm processor chip is connected the corresponding pin of USB overcurrent protection chip LM3268M-L with the over-current state signal, the arm processor chip gathers the power supply state of USB, and the usb data signal of arm processor links to each other with the usb data interface.

As shown in Figure 5, be power circuit, owing to adopting bus 24V power supply, so need the EUP3410 chip, the 24V power supply of bus is converted to 5V, and recycling SG2001-3.3V chip is the 3.3V fixed voltage with the 5V voltage transitions, is arm processor chip and network chip power supply.

As shown in Figure 6, software flow for this module, system's Real-time Collection field video signal, whole software systems are transplanted embedded OS uC/OS-II and Lwip protocol stack, add Ethernet card driving and USB and drive, transmit for making things convenient for Ethernet data, the video data that gathers is compressed, and add the Ethernet frame head, carry out network data and send.

After this module powered on, program was at first carried out the initialization of whole hardware system, enables ARM and network chip, clock and peripheral controllers are set, then initialization embedded OS uC/OS-II and Lwip protocol stack, wait for that chip is ready after, the user task that starts the operating system.Utilize embedded OS uC/OS-II to carry out multi-job operation, task 1 gathers video data, carries out the application of data buffer zone, with Video Data Storage in appointed buffer; The Frame of preserving in 2 pairs of tasks 1 of task carries out data compression; 3 pairs of compressions of task are added the Ethernet frame head to video data, and carry out the network data transmission.

According to the above description, can realize the solution of the present invention in conjunction with art technology.

Claims (1)

1. comprise main control module and peripheral circuit thereof, ethernet communication module, video data acquiring module, power module based on the embedded video transport module of Ethernet, it is characterized in that: main control module is made of arm processor chip, 12MHz crystal, 32.768KHz crystal, reset circuit, standard jtag circuit;

The ethernet communication module is made of network chip and the RJ45 network interface of network transformer, integrated PHY layer, the ethernet communication module links to each other with the arm processor chip by the MII interface, network transformer is connected with network chip, RJ45 network interface respectively, realizes the isolation of network signal and Communication signal by network transformer; The video data acquiring module is made of USB device interface and external camera, and the video data acquiring module links to each other by USB interface with the arm processor chip; Power module provides power supply for ethernet communication module and arm processor chip;

Arm processor chip in the described main control module is the LPC1768 microprocessor of NXP company: the operating voltage of main circuit module is 3.3V; The standard jtag circuit links to each other with the arm processor chip, is used for the on-line debugging of circuit;

Network chip in the described ethernet communication module is DP83848I; Network transformer is HR911105A, and network transformer HR911105A is connected with network chip DP83848I, RJ45 network interface respectively; The main circuit module power supply obtains+the 24V power supply by RJ45 network interface 4,5 pin of RJ45 netting twine from industrial switch, obtains GND from 7,8 pin;

Described video acquisition module adopts USB Device interface to link to each other with the USB peripheral hardware of arm processor, for preventing overcurrent to the damage of circuit, connects USB overcurrent protection chip LM3268M-L between arm processor and USB interface;

Described power module adopts bus 24V power supply, utilizes the EUP3410 chip that the 24V power supply of bus is converted to 5V, and recycling SG2001-3.3V chip is the 3.3V fixed voltage with the 5V voltage transitions, is arm processor chip and network chip power supply;

The prefabricated software systems of arm processor chip LPC1768 are transplanted embedded OS uC/OS-II and built-in network ICP/IP protocol stack, realize the communication of Ethernet, adopt the programmed method of multitask, the field video signal that gathers is compressed with Ethernet transmit.

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