CN116414466A

CN116414466A - Method for controlling deep dormancy

Info

Publication number: CN116414466A
Application number: CN202111650239.XA
Authority: CN
Inventors: 刘思慧
Original assignee: Beijing Ingenic Semiconductor Co Ltd
Current assignee: Beijing Ingenic Semiconductor Co Ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2023-07-11

Abstract

The invention provides a method for controlling deep dormancy, which comprises the following steps: an external MCU is added in the application system, and the MCU is connected with an interface of the CPU and communicates through an interface protocol: obtaining a grade to be subjected to dormancy through a serial port protocol; judging whether the CPU terminal is powered off or not and controlling the switching power of the CPU terminal through a power interface; the MCU is connected with a DDR power supply control signal and used for controlling the switching power of the DDR; WKUP key connects MCU and CPU simultaneously, can do input and output simultaneously at MCU end: when the WKUP key is pressed, the CPU and the MCU are awakened at the same time; and when the MCU receives other gpio interrupts, the MCU is awakened, and the WKUP_N signal is pulled down to awaken the CPU. According to the method, an external MCU is added in the system, and the function that a plurality of external signals can wake up the deep sleep can be achieved through the MCU. The deep sleep and the on-off functions are realized simultaneously through the communication of the MCU and the CPU.

Description

Method for controlling deep dormancy

Technical Field

The invention relates to the technical field of dormancy wakeup of systems, in particular to a method for controlling deep dormancy.

Background

The existing deep sleep design is to utilize sleep flow provided by a Linux system to design software and hardware for sleep of a hibernate level, and combines the advantages of sleep and hibernate to realize ultra-low power consumption and a rapid wake-up function of sleep.

When the power supply is dormant, only the RTC domain and the DDR domain are powered, the DDR enters a low-power self-refresh state, and other power domains are powered off completely, so that the power consumption is reduced. The configuration of the PLL and the DDR is stored before dormancy, and when the system is powered on and started, the system directly jumps to the RTC RAM to realize the wake-up function, so that the configuration of the PLL and the DDR is restored, and the wake-up speed is increased. Because DDR enters the self-refresh mode, the data in the DDR can be saved and not lost, the program is awakened back to continue to run at the position before dormancy, and the system does not need to be restarted.

However, deep sleep only implements deep sleep and wake functions. Only one wake up WKUP (WKUP) button is connected to the RTC and other external signals cannot wake up the system. The DDR domain is always powered, and the power on and off functions cannot be realized.

Furthermore, the common terminology in the prior art is as follows:

1. dormancy awakening, namely a power management mode provided by a linux system.

Idle, sleep: sleep mode provided by linux power management.

Hibernate: sleep mode provided by linux power management.

4.RTC:real time clock, real time clock.

RTC RAM a piece of RAM space in the RTC domain for saving code and data at the time of deep sleep.

DDR: double Rate dynamic random Access memory.

Pll: phase locked loop.

Ddr self-refresh: and a refresh command is sent out every 64ms in the ddr without participation of a controller, so that data is not lost.

Tcsm: a section of SRAM space.

Bootrom, a boot code cured inside the chip.

UART (Universal Asynchronous Receiver-Transmitter) is a universal serial data bus for asynchronous communications, which is a low-speed, full duplex communications data bus. UART has two data transmission lines of TX (transmit data line), RX (receive data line), UART_RX (receive data) is external device- > (serial input) rxd- > -serial input shift register- > -input data buffer- > -MCU core. UART_TX transmit data (Tx) MCU core- > output data buffer- > serial shift output register- > txd (serial output) - > external device.

GPIO (General purpose input/output, english), general purpose input/output abbreviation.

Disclosure of Invention

In order to solve the above problems, the present method aims at: an external MCU is added, and the function of waking up the deep sleep by a plurality of external signals is realized through the MCU. The deep sleep and the on-off functions are realized simultaneously through the communication of the MCU and the CPU.

In particular, the present invention provides a method for controlling deep sleep, the method comprising: an external MCU is added in the application system, and the MCU is connected with an interface of the CPU and communicates through an interface protocol: obtaining a grade to be subjected to dormancy through a serial port protocol; judging whether the CPU terminal is powered off or not and controlling the switching power of the CPU terminal through a power interface; the MCU is connected with a DDR power supply control signal and used for controlling the switching power of the DDR;

the wake-up key WKUP is simultaneously connected with the MCU and the CPU, and can simultaneously input and output at the MCU end:

when the wakeup key WKUP is pressed, the CPU and the MCU are simultaneously waken;

when the MCU receives other gpio interrupts, the MCU is awakened, pulling down and then pulling up the WKUP_N level signal to wake up the CPU.

Any gpio interrupt can wake up the MCU, and the MCU is automatically waken up only if receiving the gpio interrupt signal. The MCU is externally connected, and the MCU with different models can be different.

The UART8_TXD and the UART8_RXD of the CPU are connected with the LPUART_RX and the LPUART_TX of the MCU; the two parties communicate through a serial port protocol, and the CPU informs about the sleep level to be executed, wherein the sleep level comprises: idle, idle_pd, sleep, deep sleep, poweroff; and if the CPU executes different sleep grades, the MCU correspondingly performs different operations.

And the PWRON pin of the CPU is connected with the MCU_PA3 pin of the MCU to judge whether the CPU end is powered off or not and control the switching power of the CPU end.

MCU_PC4 of MCU connects the power control signal of DDR, is used for controlling the switching electricity of DDR.

The method further comprises at least one signal waking up a deep sleep: the MCU is provided with a plurality of gpio, a signal serving as a wake-up source on the development board is connected to the gpio of the MCU, and when the signal serving as the wake-up source has high-low level change, the MCU interrupt can be triggered; after the MCU detects that the wake-up source sends out a wake-up signal, the MCU_PC3 is pulled down and pulled up, namely the MCU_PC3 is connected to a WKUP_N signal of the CPU; the level of WKUP_N is from high to low to high and is a wake-up signal of the CPU, and the level of MCU pull MCU_PC3 simulates a signal for waking up the CPU; the MCU sends a WKUP_N signal to the CPU in a gpio simulation mode, and the CPU receives the WKUP_N signal to wake up the application system.

For the CPU, only WKUP_N can wake up the CPU when deep sleep is performed; for MCU, any gpio interrupt can wake up MCU, MCU is used for a conversion, when key signal is used as wake-up source, when key is pressed down, gpio interrupt generated by pressing the key wakes up MCU, then MCU pulls WKUP_N signal needed by CPU through gpio analog mode, wakes up CPU;

the signal used as the wake-up source comprises keys, wifi, bluetooth and the like;

the MCU has a plurality of gpio, and a signal which is required to be used as a wake-up source is connected to the gpio of the MCU, and any signal connected to the gpio of the MCU can also be used as the wake-up source.

The method further comprises: the use flow of deep sleep:

the CPU sends information to the MCU through the UART to tell the CPU to execute deep sleep;

after receiving the information sent by the UART, the MCU sets the MCU to be in a low power consumption mode;

c, the CPU enters a deep sleep state, the PWRON is pulled down, namely the level signal of the PWRON is pulled down, and the hardware circuit is closed except RTC, DDR, MCU;

d. when the wakeup key WKUP is pressed, the CPU and the MCU can be simultaneously awakened; when the MCU receives other gpio interrupts, the MCU is awakened, and the level signal of WKUP_N is pulled down and then pulled up so as to awaken the CPU;

e, pulling up PWRON by the RTC, namely pulling up the level signal of PWRON, and recovering each circuit;

and f, the CPU exits the deep sleep mode, and the MCU exits the low power consumption mode.

The method further comprises: the control flow of the on-off function is as follows:

the CPU sends information to the MCU through the UART to tell the CPU to shut down;

b, the CPU executes a poweroff command to enter a hibernate state, pulls down PWRON, and turns off other circuits except DDR and RTC;

after the MCU detects that PWRON is pulled down, the MCU pulls down MCU_PC4 to turn off DDR electricity; then the hardware turns off the MCU; only the power of the RTC domain is reserved, and the power-off state is entered;

i.e. PWRON goes low, the mcu_pc4 only needs to be pulled down by software program control, and other operations are completed by hardware circuitry: namely, MCU_PC4 is pulled down, MCU_PA3 becomes high, MOS transistor Q19 is turned off; after the DDR_VDD1_EN_N pin is high, the MOS transistor Q20 is turned on, the EN end of the power chip U12 is pulled down to about 0.1V, the power chip U12 is turned off, and the MCU_3V3 is powered down;

D. when the wake-up key WKUP is pressed, the WKUP_N signal is pulled down;

e, after the RTC detects the change of the WKUP_N signal, the RTC pulls PWRON high, and each circuit is recovered;

and F, starting the CPU, and starting the MCU.

The application system comprises Linux.

Thus, the present application has the advantages that: only one MCU is added to realize other external signals to wake up the system and realize the startup and shutdown functions. The method is simple, economical and practical.

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 circuit diagram of connection between an MCU and a CPU through IO in the present application.

Fig. 2 is a schematic diagram of a usage flow of deep sleep in the method of the present invention.

Fig. 3 is a schematic diagram of a control flow of the power-on/off function in the method of the present invention.

Fig. 4 is a schematic circuit diagram of the power off MCU in the method of the present invention.

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.

The specific implementation mode of the application is a sleep mode use control method based on the design customization of deep sleep of Beijing jun integrated circuit stock limited (hereinafter referred to as Beijing jun). The method of the application is applicable to Li nux application systems. But not just to Linux systems. The code or program related by the method is moved to other operating systems and can be used, and only for facilitating understanding, the embodiment is put on Linux.

A method of controlling deep sleep, the method comprising:

an external MCU is added in the application system, and the MCU is connected with an interface of the CPU and communicates through an interface protocol: obtaining a grade to be subjected to dormancy through a serial port protocol; judging whether the CPU terminal is powered off or not and controlling the switching power of the CPU terminal through a power interface; the MCU is connected with a DDR power supply control signal and used for controlling the switching power of the DDR;

when the MCU receives other gpio interrupts, the MCU wakes up, pulling the WKUP_N signal low and then high to wake up the CPU.

In particular, the method may be described as follows:

the MCU and the CPU are connected through IO, as shown in figure 1,

uart_rx and lpuart_tx of the MCU are connected to UART8_txd and UART8_rxd of the cpu. The two parties communicate through a serial port protocol to inform about the sleep level to be executed, wherein the sleep level comprises: idle, idle_pd, sleep, deep sleep, poweroff, etc. The CPU executes different sleep grades, and the MCU performs different operations. The respective sleep levels are powered down and clocked differently. These sleep levels have all been implemented within the same piece of code.

And 2, the PWRON of the CPU is connected with the MCU_PA3 of the MCU, so that whether the CPU end is powered off or not and the switching power of the CPU end can be controlled can be judged.

And 3, connecting MCU_PC4 of the MCU with a DDR power supply control signal for controlling the switching power of the DDR.

The WKUP button is connected to both the MCU and the CPU. The MCU end can simultaneously input and output. When the WKUP button is pressed, the CPU and the MCU can be awakened at the same time. When the MCU receives other gpio interrupts, the MCU is awakened, and pulls down the WKUP_N signal to wake up the CPU. Any gpio interrupt can wake up the MCU, and the MCU is automatically waken up only if receiving the gpio interrupt signal. The MCU is externally connected, and the MCU with different models can be different.

Method for waking up deep sleep by at least one signal

The MCU has a plurality of gpio, and signals which are needed as wake-up sources on the development board are connected to the gpio of the MCU. When the signal used as a wake-up source has high and low level change, the interrupt of the MCU is triggered. After the MCU detects that the wake-up source sends out a wake-up signal, the MCU_PC3 is pulled down and pulled up, namely the MCU_PC3 is connected to a WKUP_N signal of the CPU; the level of WKUP_N is from high to low to high and is a wake-up signal of the CPU, and the level of MCU pull MCU_PC3 simulates a signal MCU for waking up the CPU; and sending a WKUP_N signal to the CPU in a gpio simulation mode, and waking up the system by the CPU after receiving the WKUP_N signal.

At least one signal wakes up a deep sleep:

for the CPU, only WKUP_N can wake up the CPU at the deep sleep.

For MCU, any gpio interrupt can wake up MCU. The MCU is used for conversion, when other signals are used as a wake-up source, for example, a certain key is pressed, the MCU is waken up by the gpio interrupt generated by pressing the key firstly, and then the MCU pulls the WKUP_N signal required by the CPU in a gpio simulation mode to wake up the CPU.

The signals intended as wake-up sources include keys, wifi, bluetooth, etc. Any signal may be coupled to gpio of the MCU.

The MCU has a plurality of gpio, and a signal which is intended as a wake-up source can be connected to the gpio of the MCU.

(III) deep sleep use flow, as shown in FIG. 2:

the CPU sends information to the MCU through the UART to tell the CPU to execute the deep sleep.

And b, after receiving the information sent by the UART, the MCU sets the MCU to be in a low-power consumption mode.

And c, the CPU enters a deep sleep state, PWRON is pulled down, and the hardware circuit is closed to all circuits except RTC, DDR, MCU.

d. When the wake-up button WKUP is pressed, the CPU and the MCU can be simultaneously woken up. When the MCU receives other gpio interrupts, the MCU wakes up, pulling the WKUP_N signal low and then high to wake up the CPU.

And e, pulling PWRON high by the RTC to restore each circuit.

(IV) shutdown function usage flow, as shown in FIG. 3:

and A, the CPU sends information to the MCU through the UART to tell the CPU to shut down.

And B, the CPU executes a poweroff command to enter a hibernate state, pulls down PWRON, and turns off other circuits except the DDR and the RTC. When poweroff is executed, only the hibernate state is entered, and the operation corresponding to the poweroff command is the hibernate state.

And C, after the MCU detects that PWRON is pulled down, pulling down MCU_PC4 to turn off DDR. The hardware then turns off the MCU's power as shown in fig. 4: after PWRON goes low, it is only necessary to pull down mcu_pc4 by a software program, and other operations are performed by hardware circuitry, the circuitry of fig. 4 being used to turn off the MCU's power. MCU_PC4 is pulled low, after which MCU_PA3 goes high and Q19 is turned off. Q20 is turned on after DDR_VDD1_EN_N goes high, the EN end of U12 is pulled down to about 0.1V, U12 is turned off, and MCU_3V3 is powered down. Only the power of the RTC domain is reserved, and the power-off state is entered.

D. When the wake-up key WKUP is pressed, the WKUP_N signal is pulled down;

and F, starting the CPU, and starting the MCU.

Furthermore, the application may also relate to TCSM and Bootrom:

TCSM: an SRAM space, in this application, is used to save and run code when dormant: the code during sleep is placed inside the TCSM and the DDR is inaccessible after entering self-refresh. After DDR enters self-refresh and before sleep, there is code to execute, so the sleep code after DDR enters self-refresh and enters self-refresh is put into TCSM. All sleep codes may also be placed into the TCSM, which is now done. Bootrom, the start code solidified in the chip: when the CPU is powered on during wake-up, a PC pointer for program execution jumps to Bootrom to execute the program, and whether the program is deep sleep is judged in the Bootrom. If the wake-up operation is the deep sleep, the operation of the RTC RAM to wake-up is skipped. If not, the system goes through the normal start-up procedure.

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

1. A method for controlling deep sleep, the method comprising:

2. The method of claim 1, wherein uart_rx and lpuart_tx of the CPU are connected to UART8_txd and UART8_rxd of the MCU; the two parties communicate through a serial port protocol, and the CPU informs about the sleep level to be executed, wherein the sleep level comprises: idle, idle_pd, sleep, deep sleep, poweroff; and if the CPU executes different sleep grades, the MCU correspondingly performs different operations.

3. The method of claim 1, wherein the PWRON pin of the CPU is connected to the mcu_pa3 pin of the MCU, for determining whether the CPU is powered off and controlling the switching power of the CPU.

4. The method for controlling deep sleep as claimed in claim 1, wherein the mcu_pc4 pin of the MCU is connected to a power control signal of the DDR for controlling switching power of the DDR.

5. A method of controlling deep sleep as claimed in claim 1, characterized in that, the method further comprises at least one signal waking up the deep sleep:

the MCU is provided with a plurality of gpio, a signal serving as a wake-up source on the development board is connected to the gpio of the MCU, and when the signal serving as the wake-up source has high-low level change, the MCU interrupt can be triggered; after the MCU detects that the wake-up source sends out a wake-up signal, the pin level of the MCU_PC3 is pulled down, and then pulled up, namely the MCU_PC3 is connected to the WKUP_N signal of the CPU; the level of WKUP_N is from high to low to high and is a wake-up signal of the CPU, and the level of MCU pull MCU_PC3 simulates a signal for waking up the CPU; the MCU sends a WKUP_N signal to the CPU in a gpio simulation mode, and the CPU receives the WKUP_N signal to wake up the application system.

6. The method of claim 5, wherein only wkup_n is able to wake up the CPU at deep sleep for the CPU;

for MCU, any gpio interrupt can wake up MCU, MCU is used for a conversion, when key signal is used as wake-up source, when key is pressed down, gpio interrupt generated by pressing the key wakes up MCU, then MCU pulls WKUP_N signal needed by CPU through gpio analog mode, wakes up CPU;

the signal used as the wake-up source comprises a key, wifi and Bluetooth;

7. A method of controlling deep sleep as claimed in claim 1, characterized in that, the method further comprises: the use flow of deep sleep:

d. when the wakeup key WKUP is pressed, the CPU and the MCU can be simultaneously awakened; when the MCU receives other gpio interrupts, the MCU is awakened, and the level signal of WKUP_N is pulled down and then pulled up to awaken the CPU;

8. A method of controlling deep sleep as claimed in claim 1, characterized in that, the method further comprises: the control flow of the on-off function is as follows:

after the MCU detects that PWRON is pulled down, the MCU pulls down MCU_PC4 to turn off DDR electricity;

then the hardware turns off the MCU; only the power of the RTC domain is reserved, and the power-off state is entered;

i.e. PWRON goes low, only control is needed to pull down mcu_pc4, other operations are done by hardware circuitry: namely, MCU_PC4 is pulled down, MCU_PA3 becomes high, MOS transistor Q19 is turned off; after the DDR_VDD1_EN_N pin is high, the MOS transistor Q20 is turned on, the EN end of the power chip U12 is pulled down to about 0.1V, the power chip U12 is turned off, and the MCU_3V3 is powered down;

D. when the wake-up key WKUP is pressed, the WKUP_N signal is pulled down;

and F, starting the CPU, and starting the MCU.

9. A method of controlling deep sleep as claimed in claim 1, characterized in that, the application system comprises Linux.