CN113094105B - Method for guaranteeing low power consumption state of USB device and waking up - Google Patents
Method for guaranteeing low power consumption state of USB device and waking up Download PDFInfo
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- CN113094105B CN113094105B CN202010023617.0A CN202010023617A CN113094105B CN 113094105 B CN113094105 B CN 113094105B CN 202010023617 A CN202010023617 A CN 202010023617A CN 113094105 B CN113094105 B CN 113094105B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000002618 waking effect Effects 0.000 title claims abstract description 7
- 101100451537 Caenorhabditis elegans hsd-1 gene Proteins 0.000 claims description 6
- 101100451536 Arabidopsis thaliana HSD2 gene Proteins 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 4
- 230000008054 signal transmission Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
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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
- G06F9/44—Arrangements for executing specific programs
- G06F9/4401—Bootstrapping
- G06F9/4418—Suspend and resume; Hibernate and awake
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/3243—Power saving in microcontroller unit
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention provides a method for guaranteeing low power consumption state of USB equipment and waking up, which comprises the following steps: s1, adding a double-pole double-throw analog switch on a USB path between a processor and a host, ensuring the signal integrity of a USB2.0 bus by using the double-pole double-throw analog switch, and maintaining a suspend state on the USB bus; s2, when the USB equipment receives a suspend signal sent by the host, the suspend signal enters a suspend state with lower power consumption, namely, the processor enters a sleep state, and the processor turns off a power supply, a clock and a bus of the kernel; s3, detecting a K or SE0 signal sent by the host to the USB device through the USB bus, and enabling the processor to exit from the sleep state as an interrupt signal of the processor, and recovering the USB bus, so that the USB device exits from the suspend state. The double-pole double-throw analog switch is a high-speed low-power-consumption double-pole double-throw analog switch.
Description
Technical Field
The present invention relates to the field of electronic circuits, and in particular, to a method for ensuring a low power consumption state of a USB device and waking up the USB device.
Background
In the prior art, when the USB bus is idle, the USB device receives a suspend signal sent by the host through the USB bus, so that the USB device enters a low-power consumption suspend state, and when the USB device receives a wake-up signal sent by the host through the USB bus, the USB device exits the suspend state. If the power consumption is further reduced, the USB device side is required to turn off the power supply, the clock and the bus of the processor core, so that the processor enters a sleep state with low power consumption, and only the interrupt signal and the reset signal can enable the processor to exit the sleep state. The USB device cannot respond to the wake-up signal sent by the host over the USB bus in the sleep state of the processor.
Terminology and interpretation in the prior art:
suspended state): the USB bus is not seen to be active for 3ms and is in a power saving state, the USB equipment is not available, the original USB address and configuration are still maintained, and the J state is maintained on the USB bus after entering the suspend state.
J state: d+=1, D- =0 on the USB bus.
K state: d+=0, D- =1 on the USB bus.
SE0 state: d+=0, D- =0 on the USB bus.
In order to ensure that the USB device can receive and respond to the wake-up signal sent by the host through the USB bus to exit from the suspend state to resume operation, it is necessary to keep the power supply and clock and bus of the processor core open, which may cause the USB device to consume too much power in the suspend state, and may not meet the low power consumption requirement of the USB IF compliance authentication requirement. If the processor is put into a sleep state with low power consumption, the USB device with the clock and bus turned off cannot directly recognize and respond to any signal sent by the host over the USB bus.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to: the invention can enable the USB device to enter a suspend state with lower power consumption after receiving the suspend command sent by the host through the USB bus, and can detect the K signal and the SE0 signal sent by the host to the USB device through the USB bus and enable the USB device to exit the suspend state.
Specifically, the invention provides a method for ensuring a low power consumption state of a USB device and waking up, which comprises the following steps:
s1, adding a double-pole double-throw analog switch on a USB path between a processor and a host, ensuring the signal integrity of a USB2.0 bus by using the double-pole double-throw analog switch, and maintaining a suspend state on the USB bus;
s2, when the USB equipment receives a suspend signal sent by the host, the suspend signal enters a suspend state with lower power consumption, namely, the processor enters a sleep state, and the processor turns off a power supply, a clock and a bus of the kernel;
s3, detecting a K or SE0 signal sent by the host to the USB device through the USB bus, and enabling the processor to exit from the sleep state as an interrupt signal of the processor, and recovering the USB bus, so that the USB device exits from the suspend state.
The double-pole double-throw analog switch is a high-speed low-power-consumption double-pole double-throw analog switch.
Thus, the present application has the advantages that: when the USB equipment receives a suspend signal sent by the host and enters a suspend state with lower power consumption, namely the processor enters a sleep state, the processor turns off the power supply, the clock and the bus of the kernel; the double-pole double-throw analog switch is used for guaranteeing the signal integrity of the USB2.0 bus; the invention can detect the K or SE0 signal sent by the host computer to the USB device through the USB bus, and the signal is used as an interrupt signal of the processor to enable the processor to exit the sleep state and restore the USB bus, thereby enabling the USB device to exit the suspend state.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate and together with the description serve to explain the invention.
Fig. 1 is a schematic flow chart of the method of the present invention.
FIG. 2 is a schematic diagram of an application circuit design of an embodiment of the system of the present invention.
FIG. 3 is a diagram of a wake-up flow of a USB bus from a suspend state.
FIG. 4 is a diagram of a reset handshake process when the USB bus receives a SE0 signal from a suspend state to enter port rest.
Detailed Description
In order that the technical content and advantages of the present invention may be more clearly understood, a further detailed description of the present invention will now be made with reference to the accompanying drawings.
As shown in fig. 1, the present invention relates to a method for ensuring a low power consumption state of a USB device and waking up, the method comprising:
s1, adding a double-pole double-throw analog switch on a USB path between a processor and a host, ensuring the signal integrity of a USB2.0 bus by using the double-pole double-throw analog switch, and maintaining a suspend state on the USB bus;
s2, when the USB equipment receives a suspend signal sent by the host, the suspend signal enters a suspend state with lower power consumption, namely, the processor enters a sleep state, and the processor turns off a power supply, a clock and a bus of the kernel;
s3, detecting a K or SE0 signal sent by the host to the USB device through the USB bus, and enabling the processor to exit from the sleep state as an interrupt signal of the processor, and recovering the USB bus, so that the USB device exits from the suspend state.
The double-pole double-throw analog switch is a high-speed low-power-consumption double-pole double-throw analog switch.
The ensuring the integrity of the USB2.0 bus signal in step S1 further includes: one path of the double-pole double-throw switch is used for disconnecting and connecting the USB bus connection between the processor and the host, and guaranteeing the quality of data signal transmission of the USB bus.
The maintaining the suspend state on the USB bus in step S1 further includes: the other path of the double pole double throw switch is used for connecting with the interrupt input of the processor, and the path is pulled up to a 3.3V power supply through a resistor of 1.5 Kohm to maintain the suspend state on the USB bus.
The step S2 further includes: the J state is maintained on the USB bus according to the USB device entering the suspend state, i.e., d+=1, D- =0.
The step S2 further includes: the pin D+ of the double-pole double-throw analog switch is communicated with the HSD1+ in a default state, and D-is communicated with the HSD 1-; after the USB device of the processor enters a suspend state, the processor sends a control signal USB_SEL of a change-over switch, the DP signal of the USB is changed into another channel, namely D+ is communicated with HSD2+, GPIO connected with the signal is set as an interrupt signal of the processor, and a clock, a bus and a processor kernel power supply are closed through software to enter a sleep state with lower power consumption.
The step S3 further includes: when the host sends a K or SE0 signal, the DP signal edge is changed from high to low, the processor is made to exit sleep state as an interrupt signal, a control signal of a switch is sent within 6ms of the longest response time of the USB2.0 bus protocol, the connection between D+ and HSD2+ is disconnected, the connection between D+ and HSD1+ is switched into, the connection between D-and HSD 1-is restored, the USB bus between the host and the processor is restored, and the USB device is restored to work.
The USB bus is a high-speed signal bus, and the data transmission rate is 480Mbps.
In a specific embodiment, as shown in fig. 2, an X1500 application circuit design of the integrated circuit corporation of beijing is taken as an example. D+ of the default state analog switch U23 is communicated with HSD1+, and D-is communicated with HSD 1-; after the USB device of the processor enters the suspend state, the processor U24 sends a control signal usb_sel of the switch, switches the DP signal of the USB to another channel, i.e. d+ is connected to hsd2+, and the GPIO connected to the signal is set as an interrupt signal of the processor, and turns off the clock, the bus and the processor core power supply through software to enter a sleep state with lower power consumption. When the host transmits K or SE0, the DP signal edge is changed from high to low, the processor is made to exit sleep state as an interrupt signal, a control signal of a change-over switch is transmitted within 6ms of the longest response time of the USB2.0 bus protocol, the connection between D+ and HSD2+ is disconnected, the connection is switched into D+ and HSD1+, D-and HSD1-, the USB bus between the host and the processor is restored, and the USB device is restored to work.
According to the USB2.0 protocol, the USB device exits the suspend state whenever a K state or a SE0 state appears on the USB bus, as shown in fig. 3, when a K signal appears on the USB bus, the USB device enters the wake-up procedure, as shown in fig. 4, when a SE0 signal appears on the USB bus, the USB device enters the reset handshake procedure. Under the condition of ensuring the quality of USB2.0 signals, the invention enables the controller to exit from sleep state by detecting the K state and the SE0 state as interrupt triggers, thereby recovering the USB bus.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations can be made to the embodiments of the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method of ensuring a low power state of a USB device and waking up, the method comprising:
s1, adding a double-pole double-throw analog switch on a USB path between a processor and a host, ensuring the signal integrity of a USB2.0 bus by using the double-pole double-throw analog switch, and maintaining a suspend state on the USB bus;
the ensuring the integrity of the USB2.0 bus signal in step S1 further includes: one path of the double-pole double-throw analog switch is used for disconnecting and connecting the USB bus connection between the processor and the host, and guaranteeing the quality of data signal transmission of the USB bus;
the maintaining the suspend state on the USB bus in step S1 further includes: the other path of the double-pole double-throw analog switch is used for being connected with the interrupt input of the processor, and the path is pulled up to a power supply of 3.3V through a resistor of 1.5K ohms, so that the suspend state on the USB bus is maintained;
s2, when the USB equipment receives a suspend signal sent by the host, the suspend signal enters a suspend state with lower power consumption, namely, the processor enters a sleep state, and the processor turns off a power supply, a clock and a bus of the kernel;
the step S2 further includes: the pin D+ of the double-pole double-throw analog switch is communicated with the HSD1+ in a default state, and D-is communicated with the HSD 1-; after the USB device of the processor enters a suspend state, the processor sends a control signal USB_SEL of a change-over switch, a DP signal of the USB is changed into another channel, namely D+ is communicated with HSD2+, GPIO connected with the signal is set as an interrupt signal of the processor, and a clock, a bus and a processor kernel power supply are closed through software to enter a sleep state with lower power consumption;
s3, detecting a K or SE0 signal sent by the host to the USB device through the USB bus, and enabling the processor to exit from the sleep state as an interrupt signal of the processor, and recovering the USB bus, so that the USB device exits from the suspend state.
2. The method of claim 1, wherein the double pole double throw analog switch is a high speed low power double pole double throw analog switch.
3. The method of claim 1, wherein the step S2 further comprises: the J state is maintained on the USB bus according to the USB device entering the suspend state, i.e., d+=1, D- =0.
4. The method of claim 1, wherein the step S3 further comprises: when the host sends a K or SE0 signal, the DP signal edge is changed from high to low, the processor is made to exit sleep state as an interrupt signal, a control signal of a change-over switch is sent within the longest response time of the USB2.0 bus protocol, the connection between D+ and HSD2+ is disconnected, the connection between D+ and HSD1+ is switched into, the connection between D-and HSD 1-is restored, the USB bus between the host and the processor is restored, and the USB device is restored to work.
5. A method of ensuring that a USB device wakes up from a low power state as claimed in claim 4, wherein the maximum response time is 6ms.
6. A method of ensuring that a USB device wakes up from a low power state as claimed in claim 1, wherein the USB bus is a high speed signal bus with a data rate of 480Mbps.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010023617.0A CN113094105B (en) | 2020-01-09 | 2020-01-09 | Method for guaranteeing low power consumption state of USB device and waking up |
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| CN202010023617.0A CN113094105B (en) | 2020-01-09 | 2020-01-09 | Method for guaranteeing low power consumption state of USB device and waking up |
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| CN113094105A CN113094105A (en) | 2021-07-09 |
| CN113094105B true CN113094105B (en) | 2024-02-27 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114020139A (en) * | 2021-11-05 | 2022-02-08 | 珠海全志科技股份有限公司 | CPU power consumption management method, computer device and computer readable storage medium |
| CN114327102B (en) * | 2021-12-06 | 2023-07-21 | 深圳市千分一智能技术有限公司 | Protocol switching method, device, equipment and computer readable storage medium |
| CN114564099A (en) * | 2022-01-20 | 2022-05-31 | 珠海亿智电子科技有限公司 | Method for reducing USB transmission power consumption and electronic device |
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