CN111464187B - Host control interface command event coding method, storage medium and computer equipment - Google Patents
Host control interface command event coding method, storage medium and computer equipment Download PDFInfo
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- CN111464187B CN111464187B CN202010305066.7A CN202010305066A CN111464187B CN 111464187 B CN111464187 B CN 111464187B CN 202010305066 A CN202010305066 A CN 202010305066A CN 111464187 B CN111464187 B CN 111464187B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
- H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
- H03M7/3059—Digital compression and data reduction techniques where the original information is represented by a subset or similar information, e.g. lossy compression
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
- H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
- H03M7/40—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code
- H03M7/42—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code using table look-up for the coding or decoding process, e.g. using read-only memory
Abstract
The invention discloses a host control interface command event coding method, a storage medium and computer equipment, and belongs to the technical field of communication. A host control interface command event encoding method, comprising: selecting a byte stream from a parameter structure corresponding to a host control interface command, return and event; separating byte streams in units of length of 2bits or 3 bits; encoding the segmented byte stream by adopting a corresponding code with a length unit of 2bits or 3 bits to generate an encoding structure; compressing the coding structure according to the parameter structure category corresponding to the byte stream to generate a coding table, a return coding table or an event coding table; the host control interface command encoding table, the return encoding table and the event encoding table are described by using an OPS macro. The application of the invention can further increase the coding compression rate without obviously increasing the conversion complexity and reducing the coding speed, so that the HCI command event coding mode can adapt to and cover all command, return and event structures in the latest Bluetooth 5.2 specification.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method for encoding a command event of a host control interface, a storage medium, and a computer device.
Background
The number of commands and events between the Bluetooth Host (Host) and the Controller (Controller) is large and the parameters are large. Thus, the host control interface (HCI, host Controller Interface) specification defines a number of command and event formats, parameters. According to the HCI protocol, the exchange of data between the Host (Host) and Controller (Controller) ends corresponds to the translation of coding rules between the structure and the byte stream. Along with the continuous upgrade of the Bluetooth core specification, the number of HCI commands/events is also increased greatly, so that the size of the HCI commands/events coding information is increased. Processing the encoded information by using a traditional Huffman (Huffman) encoding mode results in huge HCI codes, which cannot meet the requirements of the bluetooth 5.2 specification.
Disclosure of Invention
The invention mainly solves the technical problem of providing a main control interface command event coding method, a storage medium and computer equipment, which can further increase the coding compression rate under the condition of not obviously increasing the conversion complexity and reducing the coding speed, so that the HCI command event coding mode can adapt to and cover all commands, returns and event structures in the latest Bluetooth 5.2 specification.
In order to achieve the above object, the first technical scheme adopted by the present invention is: a method for encoding a host control interface command event, comprising: selecting any byte stream from a parameter structure corresponding to any one of a host control interface command, a return and an event; separating byte streams from the 1 st bit by taking 2bits or 3 bits as a length unit according to the sequence until the byte streams are completely separated; encoding the segmented byte stream according to a sequence by adopting a corresponding code with a length unit of 2bits or 3 bits to generate an encoding structure corresponding to the byte stream; compressing the encoding structure into one of a host control interface command encoding table, a return encoding table or an event encoding table according to the parameter structure category corresponding to the byte stream; and describing the host control interface command encoding table, the return encoding table and the event encoding table by using the OPS macro.
The second technical scheme adopted by the invention is as follows: a computer readable storage medium storing computer instructions operable to perform a host control interface command event encoding method in scheme one.
The third technical scheme adopted by the invention is as follows: a computer apparatus comprising a processor and a memory, the memory storing computer instructions that are operable by the processor to perform the host control interface command event encoding method of scheme one.
The beneficial effects of the invention are as follows: the application of the invention can further increase the coding compression rate without obviously increasing the conversion complexity and reducing the coding speed, so that the HCI command event coding mode can adapt to and cover all command, return and event structures in the latest Bluetooth 5.2 specification.
Drawings
FIG. 1 is a flow chart of a method for encoding command events of a host control interface according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
For a host control interface command or event, the information required to be recorded in the conventional encoding mode includes: command code, event code, return code corresponding to command, command parameter structure member, event parameter structure member, and return code parameter structure member. As the number of host control interface commands or events increases, the amount of information that needs to be recorded increases rapidly, resulting in a sudden increase in host control interface commands or event codes. The invention adopts the steps of separating, encoding and compressing command parameter structure members (byte streams), event parameter structure members (byte streams) and return parameter structure members (byte streams) to generate command encoding forms, event encoding forms and return encoding forms, and then adopts an OPS macro to identify encoding structures in the three encoding forms, thereby realizing high-efficiency data exchange between a Bluetooth Host (Host) and a Controller (Controller) through the OPS macro.
FIG. 1 illustrates a specific embodiment of a host control interface command event encoding method of the present invention, in which a host control interface command event encoding method includes:
s101, selecting byte stream, wherein one of command parameter structure, return parameter structure and event parameter structure corresponding to command, return and event of host control interface is selected, and preferably, each of the three parameter structures is composed of a group of byte streams with different lengths. A parameter structure member (a complete byte stream) is then selected from the parameter structure.
S102 is a byte stream separation step, wherein for the byte stream selected in S101, the byte stream is separated from the 1 st bit according to the sequence of the byte stream by taking 2bits or 3 bits as a length unit, and the byte stream is separated until the byte stream is separated. Such that the byte stream forms a byte stream structure that is bridged together by a number of 2-bit length units and 3-bit length units.
S103 is a coding structure generating step, for the separated byte stream in S102, coding is carried out by adopting corresponding codes with the length units of 2bits or 3 bits according to the sequence, so as to generate a coding structure corresponding to the byte stream. In one embodiment of the present invention, the code of the 2-bit length unit includes: [00] u8 for representing a single byte; [01] u16 for representing double bytes; [10]2T for indicating the end of encoding; and 11 j3 for indicating that the current 2-bit description area jumps to the 3-bit description area. In another embodiment of the present invention, a code of 3-bit length units includes: [000] u32 for representing four bytes; [001]6, u8 x 6, for representing bluetooth device addresses; [010]4BX followed by a 4bits length description for describing the one-segment byte stream; [011]8BX followed by an 8bits length description for describing the one-segment byte stream; [100] x, which represents a single byte length; [101] n, which is used to represent repetition; [110]3T for indicating the end of encoding; and [111] J2 for indicating that the current 3-bit description area jumps to the 2-bit description area.
The following are four examples of coding structures for explaining how the 2-bit length units and the 3-bit length units constitute one coding structure:
coding structure one: the 2-bit length unit adopted by the method comprises the following steps: u8, U16, J3,3 bit length units include: u32, J2,3T.
The first coding structure is composed of U8, U8, J3, U32, U32, U32, J2, U8, U16, U16, J3, U32, U32 and 3T, wherein the first coding structure comprises 3U 8, 2J 3, 2U 16, 5U 32, 1J 2 and 1 3T. A corresponding byte stream length of 35 bits for the encoding structure is illustrated.
Coding structure II: the 2-bit length unit adopted by the method comprises the following steps: u8, U16, J3,3 bit length units include: u32,4bx,4U8,4U16, J2,3T.
The second coding structure is composed of U16, J3,4BX,4U8, J2, U16, J3,4BX,4U16,3T, wherein the second coding structure comprises 2U 16, 2J 3, 2 4BX, 1 4U8, 1 4U16, 1J 2 and 1 3T. The byte stream length corresponding to the second encoding structure is 26 bits.
And the coding structure III: the 2-bit length unit adopted by the method comprises the following steps: u8, U16, J3, 2T,3 bit length units include: u32,4bx,4U8,4U16, J2,3T.
The third coding structure is composed of U8, J3, N, J2, U8, U16, U8 and 2T, wherein the third coding structure comprises 3U 8, 1U 16, 1J 3, 1 2T, 1N and 1J 2. The corresponding byte stream length of coding structure two is illustrated as 18 bits.
And the coding structure is four: the 2-bit length unit adopted by the method comprises the following steps: u8, J3,3 bit length units include: x is a metal alloy.
The coding structure IV consists of U8, J3 and X, wherein the coding structure IV comprises 1U 8, 1J 3 and 1X. The byte stream length corresponding to the second encoding structure is 7 bits.
S104, in the step of compressing the coding structure to generate the coding table, the type of the coding structure in the step S103 is determined according to the type of the parameter structure (command, return, event) where the byte stream corresponding to the coding structure is located, for example: the type of the coding structure corresponding to the byte stream in the command parameter structure is the command. And then compressing and storing the coding structure to generate a coding table with the same category, namely, generating a host control interface command coding table by all command class coding structures, generating a return coding table by all return class coding structures and generating an event coding table by all event class coding structures. In one embodiment of the present invention, the encoding structure is compressed in units of bytes to generate a corresponding encoding table. In the code table, the code structures are arranged in order from long to short, one code structure for each row.
The following describes the structure of the command encoding table after the command encoding structure is compressed, specifically for a partial example of the command encoding table:
const static UINT8 hci_table_coding_Command[]＝{/*[Len:194]*/
/*0x00*/0x2e,0x15,0xa7,0x4b,0xc5,0xe9,0xb5,0x69,0x00,
/*0x09*/0x47,0x2a,0x4e,0x97,0x8a,0xd3,0x6b,0xd3,0x00,
/*0x12*/0xf7,0x66,0xf5,0x57,0xaa,0x55,0x00,
/*0x19*/0xd7,0xa6,0x6b,0x96,0x17,0x01,
/*0x1f*/0x17,0xa7,0x7f,0x69,0x15,
/*0x24*/0x56,0x4b,0x12,0x00,
/*0x28*/0xaa,0xaa,0xaa,0x2a,
/*0x2c*/0x7a,0x6f,0xaa,0x0a,
/*0x30*/0x5e,0x9b,0xd7,0x01,
/*0x34*/0x67,0xba,0x27,0x00,
/*0x38*/0x67,0xe6,0xb6,0x00,
/*0x3c*/0xb9,0x23,0xe6,0x04,
in this local command encoding table, 12 command encoding structures are included, each of the 12 command encoding structures occupying one row in the command encoding table. In the command encoding table, the 12 command encoding structures are arranged in order of position from top to bottom and length from top to bottom.
S105 is a step of describing an encoding table by using an OPS macro, and the command encoding table, the return encoding table and the event encoding table generated in the step S104 are described by using the OPS macro, so that data exchange is realized between a Bluetooth Host (Host) and a Controller (Controller). In a specific embodiment of the present invention, the information carried by the OPS macro includes: E/R bit to indicate the category of event or return (whether the return expected after command transmission is event or return category); a command encoding offset for representing an offset bit position of the command structure in the encoding table; a command operation code including an OGF/OCF (command operation code value defined by the bluetooth specification); class R, which is used to represent command Return encoding offset (Return structure encoding offset of Return class); class E, which is used to represent Event values idx (Event values defined by the bluetooth specification of the Event class). Preferably, the OPS macro has a bit value of 32, an E/R bit of 1, a command code offset of 8bits, a command opcode of 15 bits, a class R of 8bits, and a class E of 8 bits.
Compared with the traditional Huffman coding mode, the invention has the following advantages: on one hand, the invention adopts a finite-order coding mode based on probability distribution, and has a targeted design for HCI coding. On the other hand, the invention fully utilizes the 2-bit or 3-bit coding enumeration space. There are 3 for the actual member code in the 4 enumerated spaces of 2bits, only 1 for the jump (J3); 7 out of the 8 enumerated spaces of 3 bits are used for actual member encoding, only 1 is used for jumping (J2); both X-tail, 2t,3t can be terminated without repeatedly jumping to a specific 2-bit/3-bit bridge to end.
In a specific embodiment of the present invention, a technician tests an original Huffman (Huffman) coding scheme and a coding scheme of the present invention, and the actual test results are as follows:
original Huffman coding: the command code table is about 300 bytes, the return code table is 275 bytes, the event code table is 220 bytes, the offset table cannot be described by 8bits, and the OPS macro 32bits description method fails.
The coding of the invention: the command coding table 194 bytes, the return coding table 184 bytes, the event coding table 109 bytes, and the three types of coding tables with the byte numbers smaller than the limit 255 bytes of the 8bits coding offset value can adopt the OPS macro 32bits description method.
The test results above illustrate: compared with a Huffman coding mode, the coding table in the invention is used up and has enough upgrading space; the invention keeps the command event interface transmission mode of the 32bitsOPS macro, and the coding speed is not reduced; under the condition of reduced code size, the invention improves the compression rate of the coding structure, so that more command, return and event information can be contained in the coding table to adapt to the requirement of Bluetooth version 5.2.
In one particular embodiment of the invention, the various illustrative logics, logical blocks, modules described in the present invention may be implemented or performed with a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the host control interface command event encoding method herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
In another embodiment of the present invention, a host control interface command event encoding method of the present invention may be implemented directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuit (ASIC). The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.
The invention has the beneficial effects that: the application of the invention can further increase the coding compression rate without obviously increasing the conversion complexity and reducing the coding speed, so that the HCI command event coding mode can adapt to and cover all command, return and event structures in the latest Bluetooth 5.2 specification.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the present invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A method for encoding a host control interface command event, comprising:
selecting any section of byte stream from a parameter structure corresponding to any one of a host control interface command, a return and an event;
separating the byte stream from the 1 st bit according to the sequence by taking 2bits or 3 bits as a length unit until the byte stream is completely separated;
coding the segmented byte stream according to a sequence by adopting the corresponding codes of the 2-bit or 3-bit length units, and generating a coding structure corresponding to the byte stream;
compressing the encoding structure into one of a host control interface command encoding table, a return encoding table or an event encoding table according to the parameter structure category corresponding to the byte stream; and
describing the host control interface command encoding table, the return encoding table and the event encoding table by using an OPS macro;
the information carried by the OPS macro includes: E/R bit to indicate the category of event or return; a command encoding offset for representing an offset bit position of the command structure in the encoding table; a command opcode, which includes OGFOCF; class R, which is used to represent the command return encoding offset; class E, which is used to represent event values.
2. The host control interface command event encoding method of claim 1, wherein the encoding structure is compressed in bytes.
3. The method of claim 1, wherein the encoding structures are arranged in a long-to-short order in the host control interface command encoding table, the return encoding table, or the event encoding table.
4. The host control interface command event encoding method of claim 1, wherein the code of 2-bit length units comprises:
[00] u8 for representing a single byte;
[01] u16 for representing double bytes;
[10]2T for indicating the end of encoding; and
[11] j3, which is used to indicate that the current 2-bit description area jumps to the 3-bit description area.
5. The host control interface command event encoding method of claim 1, wherein the code of the 3-bit length unit comprises:
[000] u32 for representing four bytes;
[001]6, u8 x 6, for representing bluetooth device addresses;
[010]4BX followed by a 4bits length description for describing the one-segment byte stream;
[011]8BX followed by an 8bits length description for describing the one-segment byte stream;
[100] x, which represents a single byte length;
[101] n, which is used to represent repetition;
[110]3T for indicating the end of encoding; and
[111] j2 is used to indicate that the current 3-bit description area jumps to the 2-bit description area.
6. The host control interface command event encoding method of claim 1, wherein the OPS macro has a bit value = 32.
7. The method of claim 1, wherein the E/R bit is 1 bit, the command code offset is 8bits, the command opcode is 15 bits, the R class is 8bits, and the E class is 8 bits.
8. A computer readable storage medium storing computer instructions operable to perform the host control interface command event encoding method of any one of claims 1-7.
9. A computer device comprising a processor and a memory, the memory storing computer instructions, wherein the processor operates the computer instructions to perform the host control interface command event encoding method of any of claims 1-7.
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