CN115562828A - Time slice-based scheduling system in 1553B bus network - Google Patents

Time slice-based scheduling system in 1553B bus network Download PDF

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Publication number
CN115562828A
CN115562828A CN202211203854.0A CN202211203854A CN115562828A CN 115562828 A CN115562828 A CN 115562828A CN 202211203854 A CN202211203854 A CN 202211203854A CN 115562828 A CN115562828 A CN 115562828A
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message
time slice
transmission
time
timing message
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苏通山
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Shenzhen Zhonghang Industrial Control Semiconductor Co ltd
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Shenzhen Zhonghang Industrial Control Semiconductor Co ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/46—Multiprogramming arrangements
    • G06F9/48—Program initiating; Program switching, e.g. by interrupt
    • G06F9/4806—Task transfer initiation or dispatching
    • G06F9/4812—Task transfer initiation or dispatching by interrupt, e.g. masked
    • G06F9/4831—Task transfer initiation or dispatching by interrupt, e.g. masked with variable priority
    • G06F9/4837—Task transfer initiation or dispatching by interrupt, e.g. masked with variable priority time dependent
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/14—Handling requests for interconnection or transfer
    • G06F13/16—Handling requests for interconnection or transfer for access to memory bus
    • G06F13/1605—Handling requests for interconnection or transfer for access to memory bus based on arbitration
    • G06F13/161—Handling requests for interconnection or transfer for access to memory bus based on arbitration with latency improvement
    • G06F13/1636—Handling requests for interconnection or transfer for access to memory bus based on arbitration with latency improvement using refresh
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/14—Handling requests for interconnection or transfer
    • G06F13/16—Handling requests for interconnection or transfer for access to memory bus
    • G06F13/1668—Details of memory controller
    • G06F13/1689—Synchronisation and timing concerns
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/46—Multiprogramming arrangements
    • G06F9/54—Interprogram communication
    • G06F9/546—Message passing systems or structures, e.g. queues

Abstract

The invention discloses a scheduling system based on time slices in a 1553B bus network, which comprises a plurality of time slice areas, wherein each time slice area is divided according to a message period and a delay characteristic in each small period and is used for transmitting strict timing messages and non-strict timing messages, and the scheduling system comprises a loading time slice area, a synchronous time slice area, a period time slice area front section, a UPE time slice area front section, a SUPE time slice area front section, a period time slice area rear section, a UPE time slice area rear section, a management message time slice area, a retry message time slice area and a SUPE time slice area rear section. The invention is based on the scheduling of time slices, schedules the messages with different cycle characteristics and delay characteristics in different time slice areas, and reserves the interval time between the message and the next message even if the message does not have the sending condition for strict timing messages, thus, the cycle of the message is determined, and the condition that the transmission time of all subsequent messages is inaccurate due to inaccurate message transmission cycle or incomplete message transmission can not occur.

Description

Time slice-based scheduling system in 1553B bus network
Technical Field
The invention relates to the technical field of computers, in particular to a scheduling system based on time slices in a 1553B bus network.
Background
1553B is a time-division command/response type multiplexed data bus, which is widely used in avionics due to its high reliability and real-time, and is also widely used in ship systems at present. A Bus Controller (BC) can be attached to the bus, and a plurality (no more than 31) of Remote Terminals (RT) for connecting the subsystem and the data bus to perform data communication can be attached to the bus, and a bus Monitor (MT) can be generally attached to the bus for monitoring the communication state of each node.
In the prior art, messages defined in a 1553B bus table can be transmitted only according to the front-back sequence defined by the messages, and once the messages do not have the sending condition, the subsequent messages are transmitted immediately; once a defined small period fails to transmit all the conditioned messages, the subsequent message transmission period will be inaccurate.
Disclosure of Invention
In view of the above technical problems, the invention provides a scheduling system based on time slices in a 1553B bus network, so that the message transmission period of the 1553B bus network is determined, and the utilization rate of the bus bandwidth is high.
Additional features and advantages of the invention will be set forth in the detailed description which follows, or may be learned by practice of the invention.
The invention aims to provide a time slice-based scheduling system in a 1553B bus network, which comprises the following components:
a plurality of time slice zones, each of the time slice zones being divided according to a message period and a delay characteristic in each small period, the plurality of time slice zones being used for transmitting a strict timing message and a non-strict timing message, wherein the plurality of time slice zones include:
loading a time slice area, which is used for screening the messages possibly transmitted in the small period once and putting the messages into a dynamic cross table;
a synchronous time slice area, which is used for transmitting bus synchronous messages defined by the system, inquiring whether emergency message transmission exists after the transmission of each synchronous message is completed, and losing the synchronous messages when the transmission of the synchronous messages is not completed enough in the residual time;
a periodic time slice region front segment for transmitting said critical timing messages without refresh flags when said system defines said critical timing messages without refresh flags for periodic transmission;
a UPE time slice segment front segment for transmitting said non-critical timing messages with refresh indicator when said system defines said non-critical timing messages with refresh indicator;
a SUPE time slice area front section and a SUPE time slice area rear section, which are used for transmitting the strict timing message when the system defines the strict timing message with a refresh mark and the maximum transmission delay of the strict timing message is 1/2 of the small cycle time;
a back segment of the periodic time slice region, configured to continue to transmit the non-completed strict timing message when the transmission of the strict timing message without the refresh flag is not completed in the front segment of the periodic time slice region;
a UPE time slice zone back segment for defining said non-rigid timing message with a refresh flag in said system, and when said transmission of said non-rigid timing message is not completed in said UPE time slice zone front segment, continuing to transmit said non-rigid timing message which is not completed.
Further, in the front segment of the periodic time slice region, when the strict timing message without the refresh flag periodically transmitted does not have the sending condition, the interval time between the strict timing message without the sending condition and the next strict timing message is reserved, and after the processing of each strict timing message is completed, whether the urgent message transmission exists is inquired; and if the remaining time is not enough to finish the transmission of the current strict timing message when the strict timing message is processed, processing the current and remaining strict timing messages in the later section of the periodic time slice, and inquiring and processing the emergency message by using the remaining time.
Further, in the front segment of the UPE time slice region, when the non-strict timing message with the refresh flag does not have a sending condition, then organizing the subsequent non-strict timing message for transmission, where the subsequent non-strict timing message may occupy an interval time between the previous non-strict timing message and the next non-strict timing message; after each non-strict timing message is processed, whether emergency message transmission exists is inquired; if the remaining time is not enough to complete the transmission of the current non-strict timing message, the current and the remaining non-strict timing messages are kept in the back segment of the UPE time slice area for processing, and the remaining time is used for inquiring and processing the emergency message.
Further, in the SUPE time slice area front segment and the SUPE time slice area back segment, if the strict timing message with the refresh flag does not have the sending condition, the interval time between the strict timing message without the sending condition and the next strict timing message is reserved, and after the processing of each strict timing message is completed, whether there is an emergency message transmission is queried; and when the strict timing message is processed, if the remaining time is not enough to finish the transmission of the current strict timing message, processing the current and the remaining strict timing messages in the later section of the periodic time slice, and inquiring and processing the emergency message by using the remaining time.
Further, in the later section of the periodic time slice, when the strict timing message without the refresh mark transmitted periodically does not have a sending condition, the interval time of the strict timing message between the current and the next is reserved; after each strict timing message is processed, whether emergency message transmission exists is inquired; if the remaining time is not enough to complete the current transmission of the strict timing message, reporting the insufficient time allocated by the periodic message to the host computer, and simultaneously, inquiring and processing the emergency message by using the remaining time.
Further, the back segment of the UPE time slice is further configured to, when the non-strict timing message that is not completely transmitted in the front segment of the UPE time slice is obtained, determine whether the current non-strict timing message has a transmission condition, and when the current non-strict timing message does not have the transmission condition, organize a subsequent non-strict timing message for transmission, where the subsequent non-strict timing message may occupy an interval time between a previous non-strict timing message and a next non-strict timing message; after the transmission of each non-strict timing message is finished, the back section of the UPE time slice area is also used for inquiring an emergency message; and when the remaining time of the later segment of the UPE time slice zone is not enough to finish transmitting a certain non-strict timing message, adding the current and the remaining non-strict timing messages into a retry message linked list.
Further, the system further comprises a retry message time slice area, wherein the retry message time slice area is used for transmitting the non-strict timing message in the retry message linked list related to the remaining time organization when the remaining time exists in the front segment of the UPE time slice area and the rear segment of the UPE time slice area; and when the remaining time is not enough to finish the transmission of the current non-strict timing message, reserving the retry message linked list and processing the retry message linked list in a subsequent period.
Further, the system further includes a management message time slice area, where the management message time slice area is used to organize and transmit a management message when there is remaining time in the front segment of the UPE time slice area and the rear segment of the UPE time slice area and when the retry message time slice area has completed transmission of the non-strict timing message in the retry message linked list, where the management message includes: querying the message; broadcasting an RTC message; a synchronization mode command with a data word; a BIT message is broadcast.
Further, the management message time slice area is specifically configured to: checking the initial da Zhou period number and the large period interval of the management message, and judging whether the management message can enter the dynamic cross table according to the initial large period number and the large period interval; when the management message is transmitted in error, determining whether to reorganize transmission on another channel according to the retry state information of the management message; when the remaining time of the management message time slice area is not enough to finish all the management message transmission, discarding the management message which is not completely transmitted; after each management message is processed, whether emergency message transmission exists is inquired, if the remaining time is not enough to complete the current management message transmission, the remaining management messages are discarded, and the emergency message is inquired and processed by using the remaining time.
The technical scheme of the invention has the following beneficial effects:
the invention is based on the scheduling of the time slice, the messages with different cycle characteristics and delay characteristics are scheduled in different time slice regions, and for the messages with strict timing, even if the messages do not have the sending condition, the interval time between the messages and the next message needs to be preserved, thus, the cycle of the transmitted messages is determined, and the condition that all the subsequent message transmission time is inaccurate due to inaccurate message transmission cycle or incomplete message transmission can not occur.
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Fig. 1 is a system for time slice based scheduling for a system according to an embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, characteristics, and/or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other systems, components, devices, steps, and the like. In other instances, well-known technical solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure.
Please refer to 1553B in conjunction with the following examples: on the 1553B data bus, messages are transmitted in time sequence, and there are 10 possible communication modes between BC and RT on the bus. Most message processing occurs in a fixed order, cycle and phase. Such messages are called periodic messages, and their transmission process is called synchronous communication. The messages can be processed according to a static schedule, the message with the minimum period time is arranged in a small frame (small period), the period time forms a main frame (large period) according to the harmony of the powers of the small period 2, each large period consists of a plurality of small periods, and the rest periods are also arranged into the message table according to the harmony of the powers.
As shown in fig. 1, an embodiment of the present disclosure provides a system for scheduling based on time slices in a 1553B bus network, where the system 100 includes:
the time slice zones are divided in each small period according to the message period and the delay characteristic, and are used for transmitting strict timing messages and non-strict timing messages.
Wherein the plurality of time slice zones comprises: and loading the time slice area 101, which is used for screening the messages possibly transmitted in the small period once and putting the messages into the dynamic cross table. All messages which are possibly transmitted in the current small period in the current subsystem 100 mode can be screened once by using the loading time slice area 101, and then the messages are put into the dynamic cross table. The time for loading the time slice 101 generally does not exceed 1% of the time of the slice, since this is a mechanism of exchanging time and space, if the space is enough, it can be considered that all messages to be transmitted in all small cycles and all subsystem 100 modes are stored in the memory, and when applied, they are directly learned from the memory, so as to save the time for searching messages.
If there is time remaining after the dynamic cross-table is formed, the time remaining needs to be preserved. The urgent message is not queried during this time period, because the loading time slice zone 101 itself has insufficient time to reserve, the remaining time is generally not more than 50us, and the remaining time is insufficient to complete an urgent message transmission.
A synchronous time slice region 102, configured to transmit bus synchronous messages defined by the system 100, and after each synchronous message is transmitted, inquire whether there is an urgent message transmission, and in the remaining time, when there is not enough synchronous message transmission, lose the synchronous message, but use the remaining time to inquire and process the urgent message.
A periodic time slice region front segment 103 for transmitting said critical timing messages without refresh flags when said system 100 defines said critical timing messages without refresh flags for periodic transmission;
a UPE time slice segment front segment 104 for transmitting said non-critical timing messages with refresh flags when said system 100 defines said non-critical timing messages with refresh flags;
a SUPE time slice area front segment 105 and a SUPE time slice area back segment 106, both configured to transmit the rigid timing message when the system 100 defines the rigid timing message with a refresh flag and the maximum transmission delay of the rigid timing message is 1/2 of the small cycle time;
a periodic time slice region back segment 107, configured to continue to transmit the non-completed strict timing message when the transmission of the strict timing message without the refresh flag is not completed in the periodic time slice region front segment 103;
a UPE time slice segment back segment 108 for defining the non-rigid timing message with a refresh flag in the system 100, and continuing to transmit the non-rigid timing message when the transmission of the non-rigid timing message is not completed by the UPE time slice segment front segment 104.
In one embodiment, in the period time slice region front segment 103, when the strict timing message without the refresh flag in the periodic transmission does not have a sending condition, the interval time between the strict timing message without the sending condition and the next strict timing message is reserved, and after the processing of each strict timing message is completed, whether there is an urgent message transmission is queried; if the remaining time is not enough to complete the transmission of the current strict timing message when processing the strict timing message, the current and remaining strict timing messages are processed in the later segment 107 of the periodic time slice, and the remaining time is used for inquiring and processing the emergency message. Specifically, in the periodic time slice segment front segment 103, the condition for not sending the strict timing message without the refresh flag in periodic transmission refers to: the RT for the strict timing message is inactive.
In one embodiment, in the UPE time slice segment front segment 104, when the non-strict timing message with the refresh flag does not have a sending condition, then the transmission of the non-strict timing message subsequent thereto is organized, and the transmission of the subsequent non-strict timing message may occupy an interval time between the previous non-strict timing message and the next non-strict timing message; after each non-strict timing message is processed, whether urgent message transmission exists is inquired; if the remaining time is not enough to complete the transmission of the current non-strict timing message, the current and remaining non-strict timing messages are retained in the later segment 108 of the UPE time slice for processing, and the remaining time is used for inquiring and processing the urgent message. Specifically, the sending condition of the non-strict timing message with the refresh flag in the front segment 104 of the UPE time slice area may include: the RT corresponding to the non-strict timing message is in an active state, the association flag is set, the message refreshing flag is set, and the vector word bit corresponding to the message is set.
In one embodiment, in the SUPE time slice front segment 105 and the SUPE time slice rear segment 106, if the strict timing message with the refresh flag does not have the sending condition, the interval time between the strict timing message without the sending condition and the next strict timing message is reserved, and after the processing of each strict timing message is completed, whether there is an urgent message transmission is queried; when the strict timing message is processed, if the remaining time is not enough to complete the transmission of the current strict timing message, the current and remaining strict timing messages are processed in the later segment 107 of the periodic time slice, and the remaining time is used for inquiring and processing the emergency message. Specifically, in the SUPE time slice area front section 105 and the SUPE time slice area back section 106, the sending condition of the strict timing message with the refresh flag may include: the RT corresponding to the strict timing message is in an active state, the association flag is set, the message refreshing flag is set, and the vector word bit corresponding to the message is set.
In one embodiment, in the periodic time slice section 107, when the strict timing message without the refresh flag transmitted periodically does not have a sending condition, the interval time of the strict timing message between the current and next is reserved; after each strict timing message is processed, whether emergency message transmission exists is inquired; if the remaining time is not enough to complete the current transmission of the strict timing message, reporting the insufficient time allocated by the periodic message to the host computer, and simultaneously, inquiring and processing the emergency message by using the remaining time. Wherein the non-sending condition of the strict timing message without the refresh flag transmitted periodically refers to: RT corresponding to strict timing message is in inactive state
In an embodiment, the UPE time slice segment back segment 108 is further configured to, when the non-strict timing message that is not completely transmitted in the UPE time slice segment front segment 104 is obtained, determine whether the current non-strict timing message has a transmission condition, and when the non-strict timing message does not have the transmission condition, organize the subsequent non-strict timing message for transmission, where the transmission of the subsequent non-strict timing message may occupy an interval between the previous non-strict timing message and the next non-strict timing message; after the transmission of each non-critical timing message is completed, the UPE time slice segment back segment 108 is further configured to query for emergency messages; when the remaining time of the UPE time slice segment back segment 108 is not enough to complete the transmission of one of the non-rigid timing messages, adding the current and remaining non-rigid timing messages to a retry message linked list. Wherein, the sending condition of the non-strict timing message in the back segment 108 of the UPE time slice zone is: the RT corresponding to the message is in an active state, the association flag is set, the message refreshing flag is set, and the vector word bit corresponding to the message is set.
Additionally, the system 100 further includes a retry message time slice area 109, where the retry message time slice area 109 is used for transmitting the non-strict timing message in the retry message linked list related to the remaining time organization when the remaining time exists in the UPE time slice area front segment 104 and the UPE time slice area rear segment 108; and when the remaining time is not enough to finish the transmission of the current non-strict timing message, reserving the retry message linked list and processing the retry message linked list in a subsequent period.
Where the retry message time slice 109 does not actually correspond to the real slice time, but rather is a fraction of the time that may remain in the UPE time slice. If the UPE time slice region has time left, a limited amount of time remains for the retry message time slice region 109 to organize associated retry message transfers. The remaining time of the retry message time slice area 109 is reserved for the following management message slice area without urgent message inquiry.
Additionally, the system 100 further includes a management message time slice area 110, where the management message time slice area 110 is used to organize a management message for transmission when there is remaining time in the UPE time slice area front segment 104 and the UPE time slice area rear segment 108, and when the retry message time slice area 109 has completed transmission of the non-rigid timing message in the retry message linked list, and the management message includes: querying the message; broadcasting an RTC message; a synchronization mode command with a data word; a BIT message is broadcast.
Where, in time, the management message fragment is after the retry message time fragment 109, the fragment does not actually correspond to the real fragment time, but rather is a possible fraction of the UPE time fragment time.
Additionally, the management message time slice area 110 is specifically configured to: checking the initial da Zhou period number and the large period interval of the management message, and judging whether the management message can enter the dynamic cross table according to the initial large period number and the large period interval; when the management message is in transmission error, determining whether to reorganize transmission on another channel according to the retry state information; when the remaining time of the management message time slice area 110 is not enough to complete all the management message transmission, discarding the management message whose transmission is not completed; after each management message is processed, whether urgent message transmission exists is inquired, if the remaining time is not enough to complete the current management message transmission, the remaining management messages are discarded, and the urgent message inquiry and processing are carried out by using the remaining time.
According to the embodiments, the technical scheme of the invention has the following beneficial effects:
the invention is based on the scheduling of the time slice, the messages with different cycle characteristics and delay characteristics are scheduled in different time slice regions, and for the messages with strict timing, even if the messages do not have the sending condition, the interval time between the messages and the next message needs to be preserved, thus, the cycle of the transmitted messages is determined, and the condition that all the subsequent message transmission time is inaccurate due to inaccurate message transmission cycle or incomplete message transmission can not occur.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention. Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Claims (9)

1. A system for time slice based scheduling in a 1553B bus network, the system comprising:
a plurality of time slice zones, each of the time slice zones being divided according to a message period and a delay characteristic in each small period, the plurality of time slice zones being used for transmitting a strict timing message and a non-strict timing message, wherein the plurality of time slice zones include:
loading a time slice area, which is used for screening the messages possibly transmitted in the small period once and putting the messages into a dynamic cross table;
a synchronous time slice area, which is used for transmitting bus synchronous messages defined by the system, inquiring whether emergency message transmission exists after the transmission of each synchronous message is completed, and losing the synchronous messages when the transmission of the synchronous messages is not completed enough in the residual time;
a periodic time slice segment for transmitting said critical timing message without a refresh flag when said system defines said critical timing message without a refresh flag for periodic transmission;
a UPE time slice segment front segment for transmitting said non-critical timing messages with refresh indicator when said system defines said non-critical timing messages with refresh indicator;
a SUPE time slice area front section and a SUPE time slice area rear section, both used for transmitting the strict timing message when the system defines the strict timing message with a refresh mark and the maximum transmission delay of the strict timing message is 1/2 of the small cycle time;
a back segment of the periodic time slice region, configured to continue to transmit the non-completed strict timing message when the transmission of the strict timing message without the refresh flag is not completed in the front segment of the periodic time slice region;
a UPE time slice zone back segment for defining said non-rigid timing message with a refresh flag in said system, and when said transmission of said non-rigid timing message is not completed in said UPE time slice zone front segment, continuing to transmit said non-rigid timing message which is not completed.
2. The system of claim 1, wherein in the cycle time slice zone front segment, when the strict timing message without refresh flag transmitted periodically has no transmission condition, the interval between the strict timing message without transmission condition and the next strict timing message is reserved, and after each strict timing message is processed, whether there is urgent message transmission is queried; and if the remaining time is not enough to finish the transmission of the current strict timing message when the strict timing message is processed, processing the current and the remaining strict timing messages in the later section of the periodic time slice, and inquiring and processing the emergency message by using the remaining time.
3. The system of claim 1, wherein in the front segment of the UPE time slice region, if the non-rigid timing message with the refresh flag has no transmission condition, then organizing the subsequent non-rigid timing message for transmission, and the subsequent non-rigid timing message transmission can occupy the interval between the previous non-rigid timing message and the next non-rigid timing message; after each non-strict timing message is processed, whether emergency message transmission exists is inquired; if the remaining time is not enough to finish the transmission of the current non-strict timing message, the current and the remaining non-strict timing messages are kept in the rear segment of the UPE time slice area for processing, and the remaining time is used for inquiring and processing the emergency message.
4. The system of claim 1, wherein in the SUPE time slice zone front segment and the SUPE time slice zone back segment, if the rigid timing message with refresh flag does not have a sending condition, an interval time between the rigid timing message without sending condition and the next rigid timing message is reserved, and after each rigid timing message is processed, it is queried whether there is an urgent message transmission; and when the strict timing message is processed, if the remaining time is not enough to finish the transmission of the current strict timing message, processing the current and the remaining strict timing messages in the later section of the periodic time slice, and inquiring and processing the emergency message by using the remaining time.
5. The system of claim 1, wherein in the cycle time slice zone back segment, when the strict timing message without refresh flag transmitted periodically does not have a condition to be sent, the interval time of the strict timing message between current and next is reserved; after each strict timing message is processed, whether emergency message transmission exists is inquired; if the remaining time is not enough to complete the current transmission of the strict timing message, reporting the insufficient time allocated by the periodic message to the host computer, and simultaneously, inquiring and processing the emergency message by using the remaining time.
6. The system of claim 1, wherein the UPE time slice zone back segment is further configured to, when obtaining the non-rigid timing message that the UPE time slice zone front segment has not been completely transmitted, determine whether the current non-rigid timing message has a transmission condition, and when the non-rigid timing message has no transmission condition, organize a subsequent non-rigid timing message for transmission, wherein the subsequent non-rigid timing message may occupy an interval between a previous non-rigid timing message and a next non-rigid timing message; after the transmission of each non-strict timing message is finished, the back section of the UPE time slice area is also used for inquiring an emergency message; and when the remaining time of the later segment of the UPE time slice zone is not enough to finish transmitting a certain non-strict timing message, adding the current and the remaining non-strict timing messages into a retry message linked list.
7. The system of claim 6 further comprising a retry message time slice zone for organizing the non-rigid timing messages in the associated retry message linked list with remaining time for transmission when the remaining time exists between the front segment of the UPE time slice zone and the back segment of the UPE time slice zone; and when the remaining time is not enough to finish the transmission of the current non-strict timing message, reserving the retry message linked list and processing the retry message linked list in a subsequent period.
8. The system of claim 7, further comprising a management message slot zone for organizing management messages for transmission when there is time remaining in a front segment of the UPE slot zone and a rear segment of the UPE slot zone and when the retry message slot zone has completed transmission of the non-rigid timing message in the retry message linked list, the management message comprising: querying the message; broadcasting an RTC message; a synchronization mode command with a data word; a BIT message is broadcast.
9. The system of claim 8, wherein the management message time slice region is specifically configured to:
checking the initial da Zhou period number and the large period interval of the management message, and judging whether the management message can enter the dynamic cross table according to the initial large period number and the large period interval;
when the management message is transmitted in error, determining whether to reorganize transmission on another channel according to the retry state information of the management message;
when the remaining time of the management message time slice area is not enough to finish all the management message transmission, discarding the management message which is not completely transmitted;
after each management message is processed, whether urgent message transmission exists is inquired, if the remaining time is not enough to complete the current management message transmission, the remaining management messages are discarded, and the urgent message inquiry and processing are carried out by using the remaining time.
CN202211203854.0A 2022-09-29 2022-09-29 Time slice-based scheduling system in 1553B bus network Pending CN115562828A (en)

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