CN104102512B - Embedded platform IO equipment dynamic identification system based on external interruption and IO equipment dynamic identification method of system - Google Patents

Abstract

An embedded platform IO device dynamic identification system based on external interrupts and an IO device dynamic identification method of the system relate to the embedded platform IO device dynamic identification technology. It aims to solve the problem of low versatility of the IO device dynamic identification technology of the existing embedded platform. When an IO device is inserted into the corresponding interface sub-board, the interface sub-board generates a corresponding identification signal, and after the identification signal is sent to the identification module, the identification module generates a corresponding interrupt signal, and the processor judges the type of the IO device according to the interrupt signal , and load the corresponding driver to enable the host system to communicate with the IO device. The invention does not need to add an electronic data table to the equipment, does not need to add a storage device for identification, does not need to customize the equipment, and does not need to modify the interface physical structure of the equipment, and can identify various IO equipment, thereby improving the generality of the system. The invention is applicable to the dynamic identification of IO equipment of the embedded platform.

Description

Embedded platform IO device dynamic identification system based on external interrupt and the system IO device dynamic identification method

technical field

The invention relates to a dynamic identification technology of an embedded platform IO device.

Background technique

The so-called dynamic identification means that when the IO device is connected to the target system, the CPU can automatically obtain the information of the inserted device (such as the type of interface, related parameters, etc.) and correctly configure or install the driver to achieve the purpose of normal communication. At the same time, when the IO device is pulled out, the CPU can also be notified, and unload the driver or release related resources to reduce resource overhead.

Existing CPUs only support a small number of devices that can support dynamic identification functions (such as USB devices), and cannot dynamically identify other devices (such as RS232 interfaces). The current solutions mainly focus on adding electronic data sheets to the equipment, inevitably adding storage devices for identification, customizing the equipment, and even modifying the physical interface structure of the equipment, which is not very versatile.

Contents of the invention

The purpose of the present invention is to provide a dynamic identification system for embedded platform IO devices based on external interrupts and a dynamic identification method for IO devices of the system in order to solve the problem of low versatility of the IO device dynamic identification technology of the existing embedded platform.

The embedded platform IO device dynamic identification system based on external interrupts of the present invention comprises an interface circuit drive module, an identification module, a public physical interface and a sub-board module composed of n interface sub-boards composed of n drive circuits, n is a positive integer greater than 1, n interface sub-boards correspond to n types of IO devices, and n drive circuits correspond to n types of IO devices;

Each interface sub-board includes a circuit that can generate coded information. The circuit includes a physical slot for connecting to a standard interface and a coded signal output terminal. The coded signal output terminal of the interface daughter board connected to the public physical interface is a The identification signal output terminal of the board module;

The identification signal output end of the sub-board module is connected to the identification signal input end of the identification module through a public physical interface, and the interruption signal output end of the identification module is connected to the interruption signal input end of the processor of the embedded platform, and the processor passes through the interface circuit in turn. The driver module, the public physical interface and the sub-board module perform data transmission with the IO device.

The processor is embedded with a software-implemented IO device dynamic identification module, and the IO device dynamic identification includes the following units:

Sleeping unit: the processor is in a sleeping state until it receives an interrupt signal from the identification module; and starts the interrupt signal judging unit after the unit finishes running;

Interrupt signal judging unit: judge whether the interrupt signal sent by the identification module is an effective interrupt signal, and start the device type inference unit when the judgment result is yes, and start the sleep unit when the judgment result is no;

The effective interrupt signal is a predefined interrupt signal;

Device type identification unit: infer the device type corresponding to the interrupt signal sent by the identification module according to the mapping relationship between the interrupt signal and the device type; and start the interface driver search unit after the unit runs;

The above mapping relationship is a preset mapping relationship. In this mapping relationship, different interrupt signals correspond to different device types;

Interface driver search unit: search the storage medium for the interface driver corresponding to the interrupt signal sent by the identification module; and start the interface driver loading unit after the unit runs;

Interface driver loading unit: load the interface driver; and start the configuration success signal sending unit after the unit finishes running;

The configuration success signal sending unit: sends the configuration success signal to the communication process; and starts the dormant unit after the unit finishes running.

The IO equipment dynamic identification method of the embedded platform IO equipment dynamic identification system based on external interrupt of the present invention is, described processor is embedded with the IO equipment dynamic identification process that software realizes, and this process comprises the following steps:

Dormancy step: the processor is in a dormant state until it receives an interrupt signal from the identification module; and after the step ends, the interrupt signal judging step is executed;

Interrupt signal judging step: judging whether the interrupt signal sent by the identification module is an effective interrupt signal, and executing the device type inference step when the judgment result is yes, and returning to the dormancy step when the judgment result is no;

The effective interrupt signal is a predefined interrupt signal;

Device type identification step: infer the device type corresponding to the interrupt signal sent by the identification module according to the mapping relationship between the interrupt signal and the device type; and perform the interface driver search step after the step ends;

The above mapping relationship is a preset mapping relationship. In this mapping relationship, different interrupt signals correspond to different device types;

Interface driver search step: search the storage medium for the interface driver corresponding to the interrupt signal sent by the identification module; and perform the interface driver loading step after this step ends;

The interface driver loading step: loading the interface driver; and executing the configuration success signal sending step after this step ends;

The step of sending a successful configuration signal: sending a successful configuration signal to the communication process; and returning to the dormant step after the step ends.

The embedded platform IO device dynamic identification system based on external interrupts of the present invention, by improving the hardware structure of the host system, when an IO device is inserted into the corresponding interface sub-board, the interface sub-board generates a corresponding identification signal, After the identification signal is sent to the identification module, the identification module generates a corresponding interrupt signal, and the processor judges the type of the IO device according to the interrupt signal, and loads the corresponding driver, so that the host system can communicate with the IO device. Compared with the existing IO device dynamic identification technology, the present invention does not need to add electronic data sheets to the device, does not need to add storage devices used for identification, does not need to customize the device, and does not need to modify the interface physical structure of the device, and can identify A variety of IO devices improve the versatility of the system.

The above-mentioned IO device dynamic identification method of the embedded platform IO device dynamic identification system based on external interrupt determines the type of the IO device by judging the interrupt signal sent by the identification module. Compared with the existing IO equipment dynamic identification technology, this method does not need to add electronic data sheets to the equipment, does not need to add storage devices for identification, does not need to customize equipment, and does not need to modify the interface physical structure of equipment, and can identify A variety of IO devices improve the versatility of the system.

Description of drawings

Fig. 1 is the functional block diagram of the embedded platform IO device dynamic identification system based on external interrupt described in embodiment one;

Fig. 2 is the functional block diagram of the embedded platform IO device dynamic identification system based on external interrupt described in embodiment three and four;

FIG. 3 is a flow chart of an IO device dynamic identification method of the external interrupt-based embedded platform IO device dynamic identification system of the present invention.

detailed description

Specific Embodiment 1: This embodiment is described in conjunction with FIG. 1. The embedded platform IO device dynamic identification system based on external interrupts described in this embodiment includes an interface circuit drive module 1, an identification module 2, and a public drive module composed of n drive circuits. The physical interface 3 and the sub-board module 4 composed of n interface sub-boards, n is a positive integer greater than 1, the n interface sub-boards correspond to n types of IO devices, and the n drive circuits correspond to n types of IO devices;

Each interface sub-board includes a circuit capable of generating coded information, the circuit includes a physical slot for connecting to a standard interface and a coded signal output end, and the coded signal output port of the interface daughter board connected to the public physical interface 3 is The identification signal output terminal of the sub-board module 4;

The identification signal output end of the sub-board module 4 is connected to the identification signal input end of the identification module 2 through the public physical interface 3, and the interruption signal output end of the identification module 2 is connected to the interruption signal input end of the processor of the embedded platform, the processor Data transmission is performed with the IO device through the interface circuit driver module 1, the public physical interface 3, and the sub-board module 4 in sequence.

As shown in FIG. 1 , in this embodiment, the processor and the interface circuit driving module 1 are connected together through two signal lines, a sending data line and a receiving data line. The identification module 2 is respectively connected to n IO pins with interrupt function of the processor through n data lines. The N signal lines of the identification module 2 are connected to the public physical interface 3, The power line of the identification module 2 is connected to the public physical interface 3 . In the interface circuit driving module 1, a total of E _n output signal lines of n driving circuits are connected to the public physical interface 3, wherein E _n =e ₁ +e ₂ +...+ _{en, e i is} corresponding to the ith The number of physical connection lines of the interface of an IO device, i=1, 2,..., n. The public physical interface 3 is provided with a public physical slot, and the interface sub-board can be directly connected with the public physical interface 3 through the physical slot. The effective pins of the public physical slots used by the boards are different. For example, the No. 1 interface sub-board uses lines 1 to 3, while the No. 2 interface daughter board uses lines 2 to 4; the second interface sub-board uses lines 2 to 4; Part of it is the signal line for identification. At this time, each interface sub-board uses the same pin, that is, the No. 1 interface sub-board to No. n interface sub-boards use the 10-13 lines of the public physical slot. ; The last part is the power cord, similarly, the power cords of all interface sub-boards use the same line sequence of the common physical slot. The identification module 2 supplies power to the interface sub-board through the public physical interface 3 .

In this embodiment, the interface circuit driving module 1 mainly completes the conversion of the system internal signals to the electrical standards of various interface signals and the physical interface standards. For example, only two signal lines are used in the system as data communication lines (sending line and receiving line), and the drive circuit through the RS485 interface is converted into three (RS485+, RS485-, GND), and if the drive circuit through the RS422 interface is converted to Becomes five (RS422TXD+, RS422TXD-, RS422RXD+, RS422RXD-, GND). The identification module 2 is used to encode the model of the inserted interface device, and transmit the code to the processor. The public physical interface 3 includes a signal line for identification and a signal line for data communication, which are used to connect the interface sub-board and the corresponding driving circuit, and distribute the signal line to the identification module 2 . The interface sub-board has a circuit for generating coded information, and one end of the circuit is a physical slot connected to a standard interface, and the other end is connected to the public physical interface 3 . It should be noted that only one interface sub-board can be connected to the public physical interface 3 at the same time. In addition to processing computing tasks, the processor module also needs to receive identification signals and load drivers corresponding to the inserted devices.

The working process of the embedded platform IO device dynamic identification system based on external interrupt described in this embodiment is as follows: firstly, the IO device is inserted into the corresponding interface sub-board, and then the interface sub-board is connected to the public physical interface 3 . At this time, the sub-board module 4 will generate an identification signal to the identification module 2 . The identification module 2 encodes the signal line, and at the same time pulls down one of the connection lines with the processor. The processor generates an interrupt based on the signal line being pulled low. The processor judges the interface type of the inserted device according to different interrupt sources, and loads the pre-stored driver program file into the memory.

Specific Embodiment 2: This embodiment is a further limitation of the external interrupt-based embedded platform IO device dynamic identification system described in Embodiment 1. In this embodiment, the processor is embedded with a software-implemented IO device A dynamic identification module, the dynamic identification of the IO device includes the following units:

Sleep unit: the processor is in a sleep state until it receives an interrupt signal from the identification module 2; and starts the interrupt signal judging unit after the unit finishes running;

Interrupt signal judging unit: judge whether the interrupt signal sent by the identification module 2 is an effective interrupt signal, and start the device type inference unit when the judgment result is yes, and start the sleep unit when the judgment result is no;

The effective interrupt signal is a predefined interrupt signal;

Device type recognition unit: infer the device type corresponding to the interrupt signal sent by the identification module 2 according to the mapping relationship between the interrupt signal and the device type; and start the interface driver search unit after the unit has finished running;

The above mapping relationship is a preset mapping relationship. In this mapping relationship, different interrupt signals correspond to different device types;

Interface driver search unit: search the storage medium for the interface driver corresponding to the interrupt signal sent by the identification module 2; and start the interface driver loading unit after the unit runs;

Interface driver loading unit: load the interface driver; and start the configuration success signal sending unit after the unit finishes running;

The configuration success signal sending unit: sends the configuration success signal to the communication process; and starts the dormant unit after the unit finishes running.

In this embodiment, interrupt signals corresponding to various identifiable IO devices need to be defined in advance, and these defined interrupt signals are effective interrupt signals. When the processor receives the interrupt signal, it judges whether the interrupt signal is a valid interrupt signal, and if so, can determine various types of IO devices corresponding to the interrupt signal.

Specific embodiment three: This embodiment is described in conjunction with FIG. 2. This embodiment is a further limitation of the external interrupt-based embedded platform IO device dynamic identification system described in embodiment one. In this embodiment, the described can generate The circuit that encodes information is implemented using an encoder.

As shown in Figure 2, when the interface sub-board is plugged into the slot of the public physical interface 3, the encoder in the interface sub-board starts to work due to the connection of the power cord, and the output end of the encoder is connected to the N terminals of the public physical interface 3. The identification signal lines are connected, and a coded signal is generated at this time. The coded signals generated by different interface daughter boards are different.

Specific Embodiment 4: This embodiment is described in conjunction with FIG. 2. This embodiment is a further limitation of the external interrupt-based embedded platform IO device dynamic identification system described in Embodiment 1. In this embodiment, the identification module 2 is implemented using a decoder.

As shown in Figure 2, the identification module 2 has received the change information of the identification signal line, which is used as the input of the decoder. At this time, the identification module 2 will pull down one of the output signal lines, and then generate an IO interrupt signal.

Specific embodiment five: this embodiment is described in conjunction with Fig. 3, this embodiment is the IO device dynamic identification method of the embedded platform IO device dynamic identification system based on external interrupt described in embodiment one, this method is: described processing The device is embedded with a software-implemented IO device dynamic identification process, which includes the following steps:

Dormancy step: the processor is in a dormant state until it receives an interrupt signal from the identification module 2; and after the step ends, the interrupt signal judging step is executed;

Interrupt signal judging step: judge whether the interrupt signal sent by the identification module 2 is an effective interrupt signal, and execute the device type inference step when the judgment result is yes, and return to perform the dormancy step when the judgment result is no;

The effective interrupt signal is a predefined interrupt signal;

Device type identification step: infer the device type corresponding to the interrupt signal sent by the identification module 2 according to the mapping relationship between the interrupt signal and the device type; and perform the interface driver search step after the step ends;

The above mapping relationship is a preset mapping relationship. In this mapping relationship, different interrupt signals correspond to different device types;

Interface driver search step: search the storage medium for the corresponding interface driver of the interrupt signal sent by the recognition module 2; and perform the interface driver loading step after this step ends;

The interface driver loading step: loading the interface driver; and executing the configuration success signal sending step after this step ends;

The step of sending a successful configuration signal: sending a successful configuration signal to the communication process; and returning to the dormant step after the step ends.

This embodiment pre-establishes the mapping relationship between the interrupt signal and the IO device. In the mapping relationship, the interrupt signal corresponds to the IO device one by one. When performing dynamic identification of the IO device, the IO device can be returned according to the configuration file (data structure storing the mapping relationship) ID identification information. As shown in Figure 3, this embodiment loads the IO device dynamic identification process in the processor. The IO device dynamic identification process can judge the received interrupt signal and compare it with the preset interrupt signal. If If the interrupt signal is a preset interrupt signal, then the IO device is considered to be the type of IO device corresponding to the interrupt signal, and then the driver of this IO device is loaded to enable the host system to communicate with the IO device. Compared with the existing IO equipment dynamic identification technology, the above method does not need to add electronic data sheets to the equipment, does not need to add storage devices used for identification, does not need to customize equipment, and does not need to modify the interface physical structure of equipment, and can identify A variety of IO devices improve the versatility of the system.

Claims (4)

1. An embedded platform IO device dynamic identification system based on external interrupts, including an interface circuit driver module (1) composed of n driver circuits, it also includes an identification module (2), a public physical interface (3) and n driver circuits A sub-board module (4) composed of interface sub-boards, n is a positive integer greater than 1, n interface sub-boards correspond to n types of IO devices respectively, and n drive circuits correspond to n types of IO devices respectively; Each interface sub-board includes a circuit capable of generating coded information, the circuit includes a physical slot for connecting to a standard interface and a coded signal output terminal, and the coded signal output of the interface daughter board connected to the public physical interface (3) The terminal is the identification signal output terminal of the sub-board module (4); The identification signal output end of the sub-board module (4) is connected to the identification signal input end of the identification module (2) through the public physical interface (3), and the interrupt signal output end of the identification module (2) is connected to the processor of the embedded platform. The interrupt signal input terminal, the processor performs data transmission with the IO device through the interface circuit drive module (1), the public physical interface (3) and the sub-board module (4) in sequence; It is characterized in that: a software-implemented IO device dynamic identification module is embedded in the processor, and the IO device dynamic identification includes the following units: Sleeping unit: the processor is in a sleeping state until it receives an interrupt signal from the identification module (2); and starts the interrupt signal judging unit after the unit finishes running; Interrupt signal judging unit: judge whether the interrupt signal sent by the identification module (2) is an effective interrupt signal, and start the device type inference unit when the judgment result is yes, and start the sleep unit when the judgment result is no; The effective interrupt signal is a predefined interrupt signal; Device type identification unit: infer the device type corresponding to the interrupt signal sent by the identification module (2) according to the mapping relationship between the interrupt signal and the device type; and start the interface driver search unit after the unit runs; The above mapping relationship is a preset mapping relationship. In this mapping relationship, different interrupt signals correspond to different device types; Interface driver search unit: search the storage medium for the interface driver corresponding to the interrupt signal sent by the identification module (2); and start the interface driver loading unit after the unit runs; Interface driver loading unit: load the interface driver; and start the configuration success signal sending unit after the unit finishes running; The configuration success signal sending unit: sends the configuration success signal to the communication process; and starts the dormant unit after the unit finishes running. 2. The embedded platform IO device dynamic identification system based on external interrupt according to claim 1, characterized in that: said circuit capable of generating coded information is realized by an encoder. 3. The embedded platform IO device dynamic identification system based on external interrupts according to claim 1, characterized in that: said identification module (2) is realized by a decoder. 4. the IO equipment dynamic identification method of the embedded platform IO equipment dynamic identification system based on external interrupt claimed in claim 1, is characterized in that: described processor is embedded with the IO equipment dynamic identification process that software realizes, and this process comprises The following steps: Dormancy step: the processor is in a dormant state until it receives an interrupt signal from the identification module (2); and after the step ends, the interrupt signal judging step is executed; Interrupt signal judging step: judge whether the interrupt signal sent by the recognition module (2) is an effective interrupt signal, and execute the device type inference step when the judgment result is yes, and return to perform the dormancy step when the judgment result is no; The effective interrupt signal is a predefined interrupt signal; Device type identification step: infer the device type corresponding to the interrupt signal sent by the identification module (2) according to the mapping relationship between the interrupt signal and the device type; and perform the interface driver search step after the step ends; The above mapping relationship is a preset mapping relationship. In this mapping relationship, different interrupt signals correspond to different device types; Interface driver search step: search the storage medium for the interface driver corresponding to the interrupt signal sent by the identification module (2); and perform the interface driver loading step after the step ends; The interface driver loading step: loading the interface driver; and executing the configuration success signal sending step after this step ends; The step of sending a successful configuration signal: sending a successful configuration signal to the communication process; and returning to the dormant step after the step ends.