CN106325360A - Apparatus and method for dynamic clock adjustment - Google Patents

Abstract

The invention discloses a device and method for dynamic clock adjustment. The device is applied to a real-time computing system and includes: a judgment timer, detecting a task time when the real-time computing system performs a task, and calculating the task time and a real-time system a time difference of the cycle; a controller that receives the time difference and generates a control signal based on the time difference and a reference time; and a clock generator that receives the control signal to generate an adjusted system clock to provide a real-time computing system. The present invention can dynamically adjust the system clock in time to improve the computing efficiency of the real-time computing system.

Description

Device and method for dynamic clock adjustment

technical field

The invention relates to the technical field of real-time computing systems, in particular to a device and method for dynamic clock adjustment.

Background technique

Existing digital real-time computing systems need to be driven by a clock to perform data calculation or processing. The faster the clock, the faster the processing can be completed, but not every situation requires the highest speed working clock, and the higher the clock speed, the more consumption Electricity. Ideally, it is the most economical way as long as the calculation is completed in time and a little remaining time is reserved.

A general real-time computing system adjusts the clock according to a preset condition, for example, a controller is used to adjust a system clock generator (CLOCK GENERATOR) to a preset value to generate a clock according to the computing requirements of a task. This method is an open-circuit control method, which cannot meet the requirement of dynamic power saving.

Another way to adjust the clock is to use the information in the Operating System (OS) to adjust the system clock. For a computing system with an operating system, the operating system will obtain a CPU LOADING value, so the CPU clock is adjusted according to the CPU LOADING value. Although this method can dynamically adjust the clock, it cannot guarantee its timeliness.

The above-mentioned methods cannot meet the requirement of a real-time computing system to dynamically adjust the clock in a timely manner. This disclosure proposes a technology for dynamic clock adjustment, which dynamically adjusts the system clock in a timely manner in a closed-loop control manner through the obtained information.

Contents of the invention

According to one aspect of the present invention, a device for dynamic clock adjustment is provided, which is applied to a real-time computing system, and the device includes: a research and judgment timer, which detects a task time for the real-time computing system to perform a task, and calculates the task A time difference between time and an instant system cycle; a controller, receiving the time difference, and generating a control signal according to the time difference and a reference time; and a clock generator, receiving the control signal to generate an adjusted system clock, to provided to this instant computing system.

In an optional embodiment, the judging timer includes a counter, which detects the task time by counting according to the clock of the real-time computing system executing the task.

In an optional implementation, the judging timer further includes a calculator or a counter to calculate the time difference between the task time and the real-time system period.

In an optional embodiment, the controller is a comparator, which compares the time difference with a reference time to generate a control signal.

According to another aspect of the present invention, a method for dynamic clock adjustment is provided, which is applied to a real-time computing system. The method includes: detecting a task time when the real-time computing system executes a task; calculating the task time and a real-time system A time difference of the period; a controller is used to generate a control signal according to the time difference and a reference time; and a clock generator is used to receive the control signal to generate an adjusted system clock to provide to the real-time computing system.

In an optional implementation, the method uses a counter to detect the task time by counting according to the clock of the real-time computing system executing the task.

In an optional implementation, the method uses a calculator or a counter to calculate the time difference between the task time and the real-time system cycle.

In an optional embodiment, the controller is a comparator, which compares the time difference with a reference time to generate a control signal.

The present invention proposes a dynamic clock adjustment technology, through which the system clock is dynamically adjusted in a closed-loop control manner through the obtained information.

Description of drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention, illustrating a dynamic clock adjustment device.

FIG. 2 is a schematic diagram of an embodiment of the present invention, illustrating the judgment timer in FIG. 1 .

FIG. 3 is a schematic diagram of an embodiment of the present invention, illustrating that a controller generates a control signal.

FIG. 4 is a schematic diagram of an embodiment of the present invention, illustrating that the clock generator receives the control signal to generate the system clock.

FIG. 5 is a schematic diagram of an embodiment of the present invention, illustrating a dynamic clock adjustment method.

Wherein, the reference signs are explained as follows:

100 Devices for Dynamic Clock Adjustment

110 Judgment Timer

111 mission time

112 real-time system cycles

113 time difference

120 controller

121 Reference time

122 control signal

130 clock generator

131 System Clock

510 Detect a task time when the real-time computing system executes a task

520 Calculate the time difference between task time and a real-time system cycle

530 using a controller to generate a control signal according to the time difference and a reference time

The 540 uses a clock generator to receive this control signal to generate an adjusted system clock for the real-time computing system

detailed description

Embodiments according to the present invention will be described in detail below with reference to the accompanying drawings so that those skilled in the art can easily understand. The described creation can be implemented in various variations, but should not be limited to these examples. The present invention omits descriptions of well-known parts, and the same reference numerals denote the same elements in the present invention.

The invention proposes a dynamic clock adjustment technology, which dynamically adjusts the system clock in time to improve the computing efficiency of the real-time computing system. FIG. 1 is a schematic diagram of an embodiment of the present invention, illustrating a dynamic clock adjustment device. As shown in Figure 1, this device 100 comprises one by one research and judge timer 110, a controller 120 and a clock generator 130, wherein research and judge timer 110 detects a task time 111 that real-time computing system executes a task, and calculates task time A time difference 113 with an instant system cycle 112; the controller 120 receives the time difference 113, and generates a control signal 122 according to the time difference 113 and a reference time 121; the clock generator 130 receives the control signal 122 to generate an adjusted system A clock 131 is provided to the real-time computing system.

According to the embodiment of the device for dynamic clock adjustment in FIG. 1 , the judgment timer 110 detects a task time 111 when the real-time computing system executes a task, and calculates a time difference 113 between the task time 111 and a real-time system period 112 . FIG. 2 is a schematic diagram of an embodiment of the present invention, illustrating the judgment timer in FIG. 1 . As shown in FIG. 2 , the judging timer 110 may include, for example, but not limited to a counter, which counts according to a clock of a real-time computing system executing a task to obtain the task time 111 .

The judgment timer 110 may also include, for example, but not limited to, a calculator (or counter) to calculate a time difference 113 between the task time 111 and a real-time system period 112 . The real-time system period 112 is the upper limit of the time required for the real-time system to execute tasks. For example, the real-time system period 112 is (1/192000) seconds for an audio signal processing task of 192K samples per second. Another example is a task that performs update processing 60 times per second, then the real-time system cycle 112 is (1/60) second. Referring to FIG. 2 , the time difference between the real-time system cycle 112 and the task time 111 is the time difference 113 , and the time difference 113 is the difference between the actual time for executing the task and the time limit, that is, the remaining time for executing the task. As mentioned above, the judgment timer 110 may include a calculator or counter to calculate the time difference 113 .

According to the embodiment in FIG. 1 , the controller 120 receives the time difference 113 and generates a control signal 122 according to the time difference 113 and a reference time 121 . FIG. 3 is a schematic diagram of an embodiment of the present invention, illustrating that a controller generates a control signal. As shown in the embodiment of FIG. 3 , the controller 120 can be, for example, a comparator, which compares the time difference 113 with the reference time 121 to generate the control signal 122 . The reference time 121 can be, for example, a set time (eg, 20 microseconds) or a certain proportion of the real-time system period 112 , such as 10% of the real-time system period 112 . In one embodiment, the reference time 121 represents the optimal buffer time (for example, 10% of the real-time system cycle), if the time difference 113 is greater than the reference time 121, it means that the remaining time for executing the task is longer than the optimal buffer time, that is, the execution The task's system clock is fast enough to have a higher remaining time than the optimal buffer time. At this time, the controller can generate a control signal 122 , such as a high potential signal. Another situation is that if the time difference 113 is less than the reference time 121, it means that the remaining time for executing the task is less than the optimal buffer time, that is, the system clock for executing the task is slower, so that there is a lower remaining time than the optimal buffer time . At this time, the controller can generate a control signal 122 , such as a low potential signal.

According to the above, the clock generator 130 receives the control signal 122 to generate an adjusted system clock 131 to provide to the real-time computing system. FIG. 4 is a schematic diagram of an implementation example of the present invention, illustrating that the clock generator 130 receives the control signal 122 to generate the system clock 131 . For example, in the above-mentioned implementation example, the clock generator 130 can generate a system clock 131 slower than the current clock according to the control signal 122 of a high potential generated by the controller 120 (or the clock generator 13 can generate a system clock 131 according to the control signal 122 of a low potential Generate a faster system clock 131) than the current clock to provide to the real-time computing system.

According to another embodiment, FIG. 5 illustrates a method for dynamic clock adjustment, which is applied to a real-time computing system. The method includes: detecting a task time when the real-time computing system executes a task, as shown in step 510; calculating the task time and A time difference of an instant system cycle, as shown in step 520; use a controller to generate a control signal according to the time difference and a reference time, as shown in step 530; and use a clock generator to receive the control signal to A system clock is generated to provide to the real-time computing system, as shown in step 540 .

In step 510, a task time for the real-time computing system to execute a task is detected, and a counter can be used to count according to a clock of the real-time computing system for executing a task to obtain the task time.

In step 520, a time difference between the task time and a real-time system period is calculated. A calculator (or counter) may be used to calculate the time difference between the task time and a real-time system period. The real-time system period is the upper limit of the time required for the real-time system to execute tasks. For example, the real-time system period 112 is (1/192000) seconds for an audio signal processing task of 192K samples per second. The real-time system cycle is, for example, a task that performs update processing 60 times per second, and the real-time system cycle 112 is (1/60) second. The time difference is the difference between the actual time for executing the task and the time limit, that is, the remaining time for executing the task.

In step 530 , a controller is used to generate a control signal according to the time difference and a reference time. The controller can be, for example, a comparator, which compares the time difference with the reference time to generate the control signal. The reference time can be, for example, a set time (eg, 20 microseconds) or a certain percentage of the real-time system cycle, such as 10% of the real-time system cycle. In one embodiment, the reference time represents the optimal buffer time (for example, 10% of the real-time system cycle), if the time difference is greater than the reference time, it means that the remaining time for executing the task is longer than the optimal buffer time, that is, the system executing the task The clock is faster so that there is a higher remaining time than the optimal buffer time. At this time, the controller can generate a control signal, such as a high potential signal. Another situation is that if the time difference is less than the reference time, it means that the remaining time for executing the task is less than the optimal buffer time, that is, it means that the system clock for executing the task is slow, so that the remaining time is lower than the optimal buffer time. At this time, the controller can generate a control signal, such as a low potential signal.

In step 540, a clock generator is used to receive the control signal to generate a system clock to provide to the real-time computing system. For example, in the above-mentioned implementation example, the clock generator can generate a system clock slower than the current clock according to the high potential control signal generated by the controller (or the clock generator can generate a faster system clock than the current clock according to the low potential control signal system clock 131) to provide to the real-time computing system.

To sum up, this disclosure proposes a technology for dynamic clock adjustment, which uses a closed-loop control method to dynamically adjust the system clock in a timely manner through the control signal generated by the controller.

The illustrations and descriptions disclosed above are only preferred embodiments of the present invention, and are not intended to limit the implementation of the present invention. Any changes or modifications made by those skilled in the art according to the spirit of the present invention are all shall fall within the scope of the appended claims of this case.

Claims (8)

1. A device for dynamic clock adjustment, applied to a real-time computing system, said device comprising: A judging timer, detecting a task time when the real-time computing system executes a task, and calculating a time difference between the task time and a real-time system period; a controller, receiving the time difference, and generating a control signal according to the time difference and a reference time; and A clock generator receives the control signal to generate an adjusted system clock to provide to the real-time computing system. 2 . The device for dynamic clock adjustment as claimed in claim 1 , wherein the judging timer comprises a counter, counting according to the clock of the real-time computing system executing the task to detect the task time. 3. The device for dynamic clock adjustment as claimed in claim 2, wherein the judgment timer further comprises a calculator or a counter to calculate the time difference between the task time and the real-time system period. 4. The apparatus for dynamic clock adjustment as claimed in claim 1, wherein the controller is a comparator, which compares the time difference with the reference time to generate the control signal. 5. A method for dynamic clock adjustment, applied to a real-time computing system, said method comprising: Detecting a task time for the real-time computing system to perform a task; calculating a time difference between the task time and an immediate system period; using a controller to generate a control signal according to the time difference and a reference time; and A clock generator is used to receive the control signal to generate an adjusted system clock to provide to the real-time computing system. 6. The method for dynamic clock adjustment according to claim 5, wherein said method uses a counter to detect said task time by counting according to the clock of said real-time computing system executing said task. 7. The method for dynamic clock adjustment as claimed in claim 5, said method uses a calculator or a counter to calculate the time difference between the task time and the real-time system period. 8. The method for dynamic clock adjustment as claimed in claim 5, wherein the controller is a comparator, which compares the time difference with the reference time to generate the control signal.