CN111464187A - Host control interface command event coding method - Google Patents
Host control interface command event coding method Download PDFInfo
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- CN111464187A CN111464187A CN202010305066.7A CN202010305066A CN111464187A CN 111464187 A CN111464187 A CN 111464187A CN 202010305066 A CN202010305066 A CN 202010305066A CN 111464187 A CN111464187 A CN 111464187A
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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, and belongs to the technical field of communication. A host control interface command event encoding method comprises the following steps: selecting a byte stream from a parameter structure corresponding to a command, a return and an event of a host control interface; separating the byte stream by taking 2bits or 3 bits as length units; coding the divided byte stream by adopting a corresponding code with a length unit of 2bits or 3 bits to generate a coding structure; compressing the coding structure according to the parameter structure type corresponding to the byte stream to generate a coding table, a return coding table or an event coding table; and describing a command code table, a return code table and an event code table of the host control interface by using the OPS macro. The application of the invention can further increase the coding compression rate under the condition of not increasing the conversion complexity and reducing the coding speed obviously, so that the HCI command event coding mode can be adapted and cover all command, return and event structures in the latest Bluetooth 5.2 specification.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a host control interface command event coding method.
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 Controller Interface (HCI) specification defines a number of command and event formats, parameters. According to the HCI protocol, the exchange of data between the Host (Host) and the Controller (Controller) corresponds to the conversion of the coding rules between the structure and the byte stream. With the upgrading of the bluetooth core specification version, the number of HCI commands/events is also increased greatly, so that the size of HCI command/event coding information becomes larger and larger. Processing this encoded information using conventional Huffman coding results in large HCI codes that 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, which further increases 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 be adapted and cover all command, return and event structures in the latest Bluetooth 5.2 specification.
In order to achieve the above object, the first technical solution adopted by the present invention is: a host control interface command event encoding method, comprising: selecting any byte stream from a parameter structure corresponding to any one of commands, returns and events of a host control interface; starting from the 1 st bit of the byte stream, separating the byte stream by taking 2bits or 3 bits as length units according to the sequence until the byte stream is completely separated; coding the divided byte stream according to the sequence by adopting corresponding codes of 2-bit or 3-bit length units to generate 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 a command code table, a return code table and an event code table of the host control interface 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 of aspect one.
The third technical scheme adopted by the invention is as follows: a computer device comprising a processor and a memory, the memory storing computer instructions that the processor operates to perform the host control interface command event encoding method of scenario one.
The invention has the beneficial effects that: the application of the invention can further increase the coding compression rate under the condition of not increasing the conversion complexity and reducing the coding speed obviously, so that the HCI command event coding mode can be adapted 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 a command event of a host control interface according to the present invention.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
For a host control interface command or event, the conventional encoding method needs to record information including: the command code, the event code, the return code corresponding to the command, the command parameter structure member, the event parameter structure member, and the return code parameter structure member. As the number of host control interface commands or events increases, the amount of information that needs to be written increases rapidly, resulting in a host control interface command or event code explosion. The invention adopts the technical scheme that a command parameter structure member (byte stream), an event parameter structure member (byte stream) and a return parameter structure member (byte stream) are separated, coded and compressed to generate a command coding table, an event coding table and a return coding table, and then an OPS macro is adopted to identify the coding structures in the three coding tables, so that the efficient data exchange is realized between a Bluetooth Host (Host) and a Controller (Controller) end through the OPS macro.
Fig. 1 shows an embodiment of a host control interface command event encoding method according to the present invention, in which an embodiment of a host control interface command event encoding method includes:
s101 is a step of selecting a byte stream, and selects any one of a command parameter structure, a return parameter structure, and an event parameter structure corresponding to a host control interface command, a return, and an event, preferably, each of the three parameter structures is composed of a group of byte streams with different lengths. A parameter structure member (a completed byte stream) is then selected from the parameter structure.
And S102 is a step of separating the byte stream, wherein the byte stream selected in S101 is separated from the 1 st bit according to the sequence of the byte stream by taking 2bits or 3 bits as length units until the division is finished. So that the byte stream forms a byte stream structure which is formed by combining a plurality of 2-bit length units and 3-bit length units in a bridging manner.
And S103 is a coding structure generation step, and for the byte stream separated in S102, corresponding codes of 2-bit or 3-bit length units are adopted to carry out coding according to the sequence, so that a coding structure corresponding to the byte stream is generated. In one embodiment of the present invention, the 2-bit length unit code 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, the 3-bit length unit code includes: [000] u32 for representing four bytes; [001]6, U8x [6] for indicating the Bluetooth device address; [010]4BX followed by a 4bits length description for describing the segment of the byte stream; [011]8BX followed by an 8bits length description for describing the segment of the byte stream; [100] x, which is used to indicate a single byte length; [101] n, which is used to represent a repeat; [110]3T, used for indicating the end of coding; 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 to illustrate how 2bit length units and 3 bit length units constitute one coding structure:
the coding structure one: the adopted 2-bit length unit comprises: u8, U16, J3, 3 bit length units comprising: u32, J2, 3T.
struct HCI_Read_Local_AMP_InfoCompStru {
UINT8 status; /* ^[001],Enum */
UINT8 amp_status; /* ^[141],Enum */
UINT32 total_bandwidth; /* ^[142],Val */
UINT32 max_guaranteed_bandwidth; /* ^[143],Val */
UINT32 min_latency; /* ^[144],Val */
UINT32 max_pdu_size; /* ^[145],Val */
UINT8 device_type; /* ^[264],Enum */
UINT16 pal_capabilities; /* ^[146],Mask */
UINT16 max_amp_assoc_length; /* ^[150],Val */
UINT32 max_flush_timeout; /* ^[147],Val */
UINT32 best_effort_flush_timeout;/* ^[148],Val */
};/*0xb5,0x24,0x2d,0x5d,0x02[LenI:5]- U8,U8,J3,U32,U32,U32,U32,J2,U8,U16,U16,J3,U32,U32,3T,R2 */
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. The encoding structure is described as a corresponding byte stream of 35 bits in length.
And a second coding structure: the adopted 2-bit length unit comprises: u8, U16, J3, 3 bit length units comprising: u32, 4BX, 4U8, 4U16, J2, 3T.
struct HCI_LE_Enable_EncryptionStru {
UINT16 connection_handle; /* ^[002],Val */
UINT8 random_number[8]; /* ^[224],Val */
UINT16 encryption_diversifier; /* ^[225],Val */
UINT8 long_term_key[16]; /* ^[258],Val */
};/*0x5e,0x9b,0xd7,0x01[LenI:4]-
U16,J3,4BX,4U8,J2,U16,J3,4BX,4U16,3T,R4 */
The second coding structure is composed of U16, J3, 4BX, 4U8, J2, U16, J3, 4BX, 4U16 and 3T, wherein the second coding structure comprises 2U 16, 2J 3, 2 4BX, 1U 8, 1U 16, 1J 2 and 1T 3. The length of the byte stream corresponding to the second encoding structure is 26 bits.
And (3) coding structure III: the adopted 2-bit length unit comprises: u8, U16, J3, 2T, 3 bit length units include: u32, 4BX, 4U8, 4U16, J2, 3T.
struct HCI_LE_Set_Extended_Advertising_EnableStru {
UINT8 enable; /* ^[353],Enum */
UINT8 number_of_sets; /* ^[422],Val */
struct HCI_LE_Set_Extended_Advertising_EnableSubStru {
UINT8 advertising_handle; /* ^[408],Val */
UINT16 duration; /* ^[423],Time */
UINT8 max_extended_advertising_events; /* ^[424],Val */
} n[1];
};/* 0xfd,0x65,0x00[LenI:3]- U8,J3,N,J2,U8,U16,U8,2T,R6 */
The coding structure III is composed of U8, J3, N, J2, U8, U16, U8 and 2T, wherein the coding structure III comprises 3U 8, 1U 16, 1J 3, 1 2T, 1N and 1J 2. The length of the byte stream corresponding to the second encoding structure is 18 bits.
And (4) encoding structure four: the adopted 2-bit length unit comprises: the U8, J3, 3 bit length units include: and (4) X.
struct HCI_LE_Extended_Advertising_ReportEvStru {
UINT8 num_reports; /* ^[222],Val */
UINT8 param_plen; /* *Length* */
UINT8 param[1]; /* ^[201],Val */
};/* 0x4d[LenI:1]- U8,J3,X,R1 */
The coding structure four is composed of U8, J3, X, which includes 1U 8, 1J 3, 1X. The length of the byte stream corresponding to the second encoding structure is 7 bits.
S104, in order to compress the coding structure to generate the coding table, first determining the type of the coding structure in S103 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 the coding structure and storing and generating coding tables with consistent classes, 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 coding structure is compressed in bytes to generate the corresponding coding table. In the coding table, the coding structures are arranged in the order from long to short, one coding structure for each row.
The following is a partial example of a command encoding table to specifically describe the structural form of the command encoding table formed after the command encoding structure is compressed:
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 the local command encoding table, 12 command encoding structures are included, and each of the 12 command encoding structures occupies one row in the command encoding table. In the command encoding table, the 12 command encoding structures are arranged in the order of the positions from top to bottom and the lengths from large to small.
And S105, adopting the OPS macro description coding table step, and adopting the command coding table, the return coding table and the event coding table generated in the OPS macro description S104 step, so as to realize data exchange between the Bluetooth Host (Host) and the Controller (Controller). In a specific embodiment of the present invention, the information carried by the OPS macro includes: an E/R bit, which is used to indicate the category of the event or return (whether the return expected after the command is sent is an event or return category); a command encoding offset for indicating an offset position of the command structure in the encoding table; a command opcode including an OGF/OCF (Command opcode value defined by the Bluetooth specification); an R class for indicating a command Return coding offset (Return structure coding offset of Return class); class E, which is used to represent an Event value idx (Event value defined by the bluetooth specification for the Event class). Preferably, the OPS macro has a bit value of 32, E/R bit of 1 bit, command code offset of 8bits, command operation code of 15 bits, class R of 8bits, and 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 facing HCI coding. On the other hand, the invention fully utilizes 2-bit or 3-bit code enumeration space. There are 3 in 4 enumeration spaces of 2bits for actual member encoding, only 1 for jumps (J3); there are 7 in 8 enumeration spaces of 3 bits for actual member encoding, only 1 for jumps (J2); the X tail, 2T and 3T can be terminated without repeatedly jumping to a specific 2-bit/3-bit bridge to finish.
In a specific embodiment of the present invention, a technician tests an original Huffman coding scheme and the 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, and the offset table cannot be described by 8bits, so that the OPS macro 32-bit description method fails.
The coding of the invention: 194 bytes of the command coding table, 184 bytes of the return coding table, 109 bytes of the event coding table, and 255 bytes of the three types of coding tables, which are all smaller than the limit of 8-bit coding offset value, can adopt an OPS macro 32-bit description method.
The above test results demonstrate that: compared with a Huffman coding mode, the coding table in the invention is completely utilized, and enough upgrading space is provided; the invention keeps the transmission mode of the command event interface of the 32bitsOPS macro, and the coding speed is not reduced; the invention improves the compression rate of the coding structure under the condition of reducing the code size, thereby enabling the coding table to contain more command, return and event information to adapt to the requirement of the Bluetooth 5.2 version.
In one particular embodiment of the invention, the various illustrative logics, logical blocks, modules described in connection with one host control interface command event encoding method of the invention can 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 both. 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 under the condition of not increasing the conversion complexity and reducing the coding speed obviously, so that the HCI command event coding mode can be adapted and cover all command, return and event structures in the latest Bluetooth 5.2 specification.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A host control interface command event encoding method, comprising:
selecting any byte stream from a parameter structure corresponding to any one of commands, returns and events of a host control interface;
starting from the 1 st bit of the byte stream, separating the byte stream by using 2bits or 3 bits as length units according to the sequence until the byte stream is completely divided;
coding the divided byte stream according to the sequence by adopting the corresponding codes of the 2-bit or 3-bit length unit to generate 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 a parameter structure category corresponding to the byte stream; and
and describing the host control interface command code table, the return code table and the event code table by using an OPS macro.
2. The host control interface command event encoding method of claim 1, wherein the unit of the encoding structure when compressed is a byte.
3. The host control interface command event coding method according to claim 1, wherein the coding structures are arranged in the host control interface command coding table, the return coding table, or the event coding table in order from long to short.
4. The host control interface command event encoding method of claim 1, wherein the 2-bit length unit code 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 for indicating that the current 2-bit description area jumps to a 3-bit description area.
5. The host control interface command event encoding method of claim 1, wherein the 3-bit length unit code comprises:
[000] u32 for representing four bytes;
[001]6, U8x [6] for indicating the Bluetooth device address;
[010]4BX followed by a 4bits length description for describing the segment of the byte stream;
[011]8BX followed by an 8bits length description for describing the segment of the byte stream;
[100] x, which is used to indicate a single byte length;
[101] n, which is used to represent a repeat;
[110]3T, used for indicating the end of coding; and
[111] j2, for indicating 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-carried information comprises:
an E/R bit for representing a category of event or return;
a command encoding offset for indicating an offset position of the command structure in the encoding table;
a command opcode, including OGF/OCF;
an R class for representing a command return code offset;
class E, which is used to represent event values.
7. The host control interface command event encoding method of claim 6, wherein a bit value of the OPS macro = 32.
8. The host control interface command event encoding method of claim 6 or 7, wherein the E/R bit is 1 bit, the command encoding offset is 8bits, the command operation code is 15 bits, the R class is 8bits, and the E class is 8 bits.
9. A computer readable storage medium storing computer instructions, wherein the computer instructions are operable to perform the host control interface command event encoding method of any one of claims 1-8.
10. 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 one of claims 1-8.
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