CN114691222A - High-reliability CAN dormancy awakening method for microprocessor - Google Patents
High-reliability CAN dormancy awakening method for microprocessor Download PDFInfo
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- 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
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Abstract
The invention provides a microprocessor high-reliability CAN dormancy awakening method, which comprises the following steps: step one, before dormancy, a timer in the microprocessor is configured to wake up as a newly-added wake-up source, so that when the CAN module is interrupted and awakened to be invalid, the timer wakes up the microprocessor periodically, and the periodicity is 1 millisecond-24 hours. According to the high-reliability CAN dormancy awakening method for the microprocessor, another awakening source is added to hardware, corresponding time delay is carried out on signals through a delay circuit, so that the two awakening sources have a certain time difference, the microprocessor CAN be awakened in two aspects, and thus, one awakening source is additionally added besides the CAN awakening source of the microprocessor and is used as a backup, the function is achieved when the CAN awakening source fails, and the microprocessor is ensured to be awakened.
Description
Technical Field
The invention relates to the technical field of CAN dormancy awakening methods, in particular to a high-reliability CAN dormancy awakening method for a microprocessor.
Background
In a plurality of industrial departments such as automobiles and the like, the CAN bus is more and more widely applied due to the excellent anti-interference performance. Sleep wake-up is a common energy saving technique in many applications, especially those requiring power savings, such as automotive applications. The main idea is that when the microprocessor does not work, the microprocessor is forced to enter a dormant state, and the power consumption is greatly saved. When the microprocessor needs to work, the microprocessor is awakened by various methods, exits from the sleep state and enters a normal working state. The sleep wake-up method is a key technology of the microprocessor.
The existing CAN sleep wake-up method generally uses only one wake-up source, for example, CAN message wake-up. That is, when the microprocessor is in a sleep state and any message appears on the CAN bus, the CAN transceiver wakes up the microprocessor through the level jump of the RXD pin signal, which is the most common method, but the CAN sleep wake-up method has a problem that due to a special reason, at a specific moment, due to the difference between the time sequence of instruction execution and the internal mark position bit time, the microprocessor is deadlocked with a certain probability and cannot be woken up as required, which is unacceptable in some key application fields.
Disclosure of Invention
The present invention is directed to overcome the drawbacks of the prior art, and to provide a method for waking up a microprocessor from a high-reliability CAN sleep, so as to solve the problems mentioned in the background art.
A microprocessor high-reliability CAN dormancy awakening method comprises the following steps:
step one, before dormancy, configuring a timer in a microprocessor to wake up as a newly-added wake-up source, and when a CAN module is interrupted and wakened up to be invalid, periodically waking up the microprocessor by the timer, wherein the periodicity is 1 millisecond-24 hours;
and step two, when the CAN module is interrupted and awakened to be invalid or the internal timer of the microprocessor is not configured to be awakened as a newly-added awakening source, the external IRQ is interrupted to awaken.
Preferably, the periodicity in the first step may be 1 millisecond apart.
Preferably, the periodicity in the first step may be 1 second apart.
Preferably, the periodicity in step one may be 1 minute intervals.
Preferably, the periodicity in step one may be 1 hour apart.
Preferably, the periodicity in the first step may be 24 hours apart.
Preferably, a triode inverter circuit is arranged in the microprocessor.
According to the high-reliability CAN dormancy awakening method for the microprocessor, another awakening source is added to hardware, corresponding time delay is carried out on signals through a delay circuit, so that the two awakening sources have a certain time difference, the microprocessor CAN be awakened in two aspects, and thus, one awakening source is additionally added besides the CAN awakening source of the microprocessor and is used as a backup, the function is achieved when the CAN awakening source fails, and the microprocessor is ensured to be awakened.
Drawings
FIG. 1 is a circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Embodiment 1, as shown in fig. 1, a method for waking up a microprocessor from a CAN sleep with high reliability includes the following steps:
step one, before dormancy, a timer in a microprocessor is configured to wake up as a newly-added wake-up source, so that when a CAN module is interrupted and awakened to be invalid, the timer periodically wakes up the microprocessor, the periodicity is 1 millisecond, so that when the microprocessor is dormant, an internal timer automatically generates interruption every 1 millisecond, wakes up the microprocessor, and then the microprocessor checks whether CAN interruption occurs outside, so that when the CAN module is interrupted and awakened to be invalid, the timer CAN ensure that the microprocessor CAN be periodically awakened and cannot be stuck in a sleep state;
step two, when the CAN module is interrupted and awakened to be invalid or a timer in the microprocessor is not configured to be awakened as a newly added awakening source, the external IRQ is interrupted, the external IRQ is awakened, if the software enters a certain state incapable of exiting or the software cannot process CAN messages, the software is difficult to recover, the software is awakened by the interruption and the awakening of the CAN module is realized by the interruption of the external IRQ, if the CAN module is interrupted and awakened to be invalid, the software CAN be awakened by the interruption of the external IRQ, for example, the microprocessor CAN not shield the interrupted IRQ, particularly, a triode inverter circuit is arranged in the microprocessor, and a triode inverter circuit is additionally arranged, and the working principle of the triode inverter circuit is as follows: when CAN _ RXD is low, that is, the CAN has message data reception, the Int _ Port signal is high, 59 and 60 pins connected to the microprocessor, the software adds interrupt signal detection (high level is effective) of IRQ (60 pin) or adds signal query of KWP2 (59 pin), then the Int _ Port signal CAN be judged to have a wake-up signal, and the Int _ Port signal enters the wake-up microprocessor, so that another wake-up source is added through hardware, and the two wake-up sources have a certain time difference by corresponding delay of the signal through a delay circuit, thereby ensuring that the microprocessor CAN be woken up in two aspects, referring to the circuit diagram in FIG. 1, when the microprocessor sleeps, an external CAN transceiver CAN automatically detect the state of the CAN bus, the CAN bus starts to wake up from the sleep, the bus level changes, at this time, the CAN transceiver CAN output a signal, CAN _ RX goes low, transistor Q1 is conducted, and the Int _ Port Port goes high, the microprocessor is interrupted by an external pin, and the microprocessor is awakened completely.
Embodiment 2, as shown in fig. 1, a method for waking up a microprocessor from a CAN sleep with high reliability includes the following steps:
step one, before dormancy, a timer in a microprocessor is configured to wake up as a newly-added wake-up source, so that when a CAN module is interrupted and awakened to be invalid, the timer periodically wakes up the microprocessor, the periodicity is 1 second, so that when the microprocessor is dormant, an internal timer automatically generates interruption every 1 second to wake up the microprocessor, and the microprocessor is checked whether CAN interruption occurs outside, so that when the CAN module is interrupted and awakened to be invalid, the timer CAN ensure that the microprocessor CAN be periodically awakened and cannot be stuck in a sleep state;
step two, when the CAN module is interrupted and awakened to be invalid or a timer in the microprocessor is not configured to be awakened as a newly added awakening source, the external IRQ is interrupted, the external IRQ is awakened, if the software enters a certain state incapable of exiting or the software cannot process CAN messages, the software is difficult to recover, the software is awakened by the interruption and the awakening of the CAN module is realized by the interruption of the external IRQ, if the CAN module is interrupted and awakened to be invalid, the software CAN be awakened by the interruption of the external IRQ, for example, the microprocessor CAN not shield the interrupted IRQ, particularly, a triode inverter circuit is arranged in the microprocessor, and a triode inverter circuit is additionally arranged, and the working principle of the triode inverter circuit is as follows: when CAN _ RXD is low, that is, the CAN has message data reception, the Int _ Port signal is high, 59 and 60 pins connected to the microprocessor, the software adds interrupt signal detection (high level is effective) of IRQ (60 pin) or adds signal query of KWP2 (59 pin), then the Int _ Port signal CAN be judged to have a wake-up signal, and the Int _ Port signal enters the wake-up microprocessor, so that another wake-up source is added through hardware, and the two wake-up sources have a certain time difference by corresponding delay of the signal through a delay circuit, thereby ensuring that the microprocessor CAN be woken up in two aspects, referring to the circuit diagram in FIG. 1, when the microprocessor sleeps, an external CAN transceiver CAN automatically detect the state of the CAN bus, the CAN bus starts to wake up from the sleep, the bus level changes, at this time, the CAN transceiver CAN output a signal, CAN _ RX goes low, transistor Q1 is conducted, and the Int _ Port Port goes high, the microprocessor is interrupted by an external pin, and the microprocessor is awakened completely.
step one, before dormancy, a timer in a microprocessor is configured to wake up as a newly-added wake-up source, so that when a CAN module is interrupted and awakened to be invalid, the timer periodically wakes up the microprocessor, the periodicity is 1 minute, so that when the microprocessor is dormant, an internal timer automatically generates interruption every 1 minute to wake up the microprocessor, and the microprocessor is checked whether CAN interruption occurs outside, so that when the CAN module is interrupted and awakened to be invalid, the timer CAN ensure that the microprocessor CAN be periodically awakened and cannot be stuck in a sleep state;
step two, when the CAN module is interrupted and awakened to be invalid or a timer in the microprocessor is not configured to be awakened as a newly added awakening source, the external IRQ is interrupted, the external IRQ is awakened, if the software enters a certain state incapable of exiting or the software cannot process CAN messages, the software is difficult to recover, the software is awakened by the interruption and the awakening of the CAN module is realized by the interruption of the external IRQ, if the CAN module is interrupted and awakened to be invalid, the software CAN be awakened by the interruption of the external IRQ, for example, the microprocessor CAN not shield the interrupted IRQ, particularly, a triode inverter circuit is arranged in the microprocessor, and a triode inverter circuit is additionally arranged, and the working principle of the triode inverter circuit is as follows: when CAN _ RXD is low, that is, the CAN has message data reception, the Int _ Port signal is high, 59 and 60 pins connected to the microprocessor, the software adds interrupt signal detection (high level is effective) of IRQ (60 pin) or adds signal query of KWP2 (59 pin), then the Int _ Port signal CAN be judged to have a wake-up signal, and the Int _ Port signal enters the wake-up microprocessor, so that another wake-up source is added through hardware, and the two wake-up sources have a certain time difference by corresponding delay of the signal through a delay circuit, thereby ensuring that the microprocessor CAN be woken up in two aspects, referring to the circuit diagram in FIG. 1, when the microprocessor sleeps, an external CAN transceiver CAN automatically detect the state of the CAN bus, the CAN bus starts to wake up from the sleep, the bus level changes, at this time, the CAN transceiver CAN output a signal, CAN _ RX goes low, transistor Q1 is conducted, and the Int _ Port Port goes high, the microprocessor is interrupted by an external pin, so that the microprocessor is awakened completely.
step one, before dormancy, a timer in a microprocessor is configured to wake up as a newly-added wake-up source, so that when a CAN module is interrupted and awakened to be invalid, the timer periodically wakes up the microprocessor, the periodicity is 1 hour, so that when the microprocessor is dormant, an internal timer automatically generates interruption every 1 hour to wake up the microprocessor, and the microprocessor is checked whether CAN interruption occurs outside, so that when the CAN module is interrupted and awakened to be invalid, the timer CAN ensure that the microprocessor CAN be periodically awakened and cannot be stuck in a sleep state;
step two, when the CAN module is interrupted and awakened to be invalid or a timer in the microprocessor is not configured to be awakened as a newly added awakening source, the external IRQ is interrupted, the external IRQ is awakened, if the software enters a certain state incapable of exiting or the software cannot process CAN messages, the software is difficult to recover, the software is awakened by the interruption and the awakening of the CAN module is realized by the interruption of the external IRQ, if the CAN module is interrupted and awakened to be invalid, the software CAN be awakened by the interruption of the external IRQ, for example, the microprocessor CAN not shield the interrupted IRQ, particularly, a triode inverter circuit is arranged in the microprocessor, and a triode inverter circuit is additionally arranged, and the working principle of the triode inverter circuit is as follows: when CAN _ RXD is low, that is, the CAN has message data reception, the Int _ Port signal is high, 59 and 60 pins connected to the microprocessor, the software adds interrupt signal detection (high level is effective) of IRQ (60 pin) or adds signal query of KWP2 (59 pin), then the Int _ Port signal CAN be judged to have a wake-up signal, and the Int _ Port signal enters the wake-up microprocessor, so that another wake-up source is added through hardware, and the two wake-up sources have a certain time difference by corresponding delay of the signal through a delay circuit, thereby ensuring that the microprocessor CAN be woken up in two aspects, referring to the circuit diagram in FIG. 1, when the microprocessor sleeps, an external CAN transceiver CAN automatically detect the state of the CAN bus, the CAN bus starts to wake up from the sleep, the bus level changes, at this time, the CAN transceiver CAN output a signal, CAN _ RX goes low, transistor Q1 is conducted, and the Int _ Port Port goes high, the microprocessor is interrupted by an external pin, and the microprocessor is awakened completely.
step one, before dormancy, a timer in a microprocessor is configured to wake up as a newly-added wake-up source, so that when a CAN module is interrupted and awakened to be invalid, the timer periodically wakes up the microprocessor, the periodicity is 24 hours, so that when the microprocessor is dormant, an internal timer automatically generates interruption every 24 hours to wake up the microprocessor, and the microprocessor is checked whether CAN interruption occurs outside, so that when the CAN module is interrupted and awakened to be invalid, the timer CAN ensure that the microprocessor CAN be periodically awakened and cannot be stuck in a sleep state;
step two, when the CAN module is interrupted and wakened up to be invalid or a timer in the microprocessor is not configured to wake up as a newly added wake-up source, the external IRQ is interrupted, the external IRQ is wakened up, if the software enters a certain state which cannot be exited or the software cannot process CAN messages, the software is difficult to recover, the software is wakened up by the interruption of the CAN module, if the CAN module is interrupted and wakened up to be invalid, the software CAN be wakened up by the interruption of the external IRQ, for example, the microprocessor CAN not shield the interrupted IRQ, specifically, a triode inverter circuit is arranged in the microprocessor, one triode inverter circuit is additionally arranged, and the working principle of the triode inverter circuit is as follows: when CAN _ RXD is low, that is, the CAN has message data reception, the Int _ Port signal is high, 59 and 60 pins connected to the microprocessor, the software adds interrupt signal detection (high level is effective) of IRQ (60 pin) or adds signal query of KWP2 (59 pin), then the Int _ Port signal CAN be judged to have a wake-up signal, and the Int _ Port signal enters the wake-up microprocessor, so that another wake-up source is added through hardware, and the two wake-up sources have a certain time difference by corresponding delay of the signal through a delay circuit, thereby ensuring that the microprocessor CAN be woken up in two aspects, referring to the circuit diagram in FIG. 1, when the microprocessor sleeps, an external CAN transceiver CAN automatically detect the state of the CAN bus, the CAN bus starts to wake up from the sleep, the bus level changes, at this time, the CAN transceiver CAN output a signal, CAN _ RX goes low, transistor Q1 is conducted, and the Int _ Port Port goes high, the microprocessor is interrupted by an external pin, and the microprocessor is awakened completely.
Claims (7)
1. A microprocessor high-reliability CAN dormancy awakening method is characterized by comprising the following steps:
step one, before dormancy, configuring a timer in a microprocessor to wake up as a newly-added wake-up source, and when a CAN module is interrupted and wakened up to be invalid, periodically waking up the microprocessor by the timer, wherein the periodicity is 1 millisecond-24 hours;
and step two, when the CAN module is interrupted and awakened to be invalid or the internal timer of the microprocessor is not configured to be awakened as a newly-added awakening source, the external IRQ is interrupted to awaken.
2. The method of claim 1, wherein the method comprises: the periodicity in step one may be 1 millisecond apart.
3. The method of claim 1, wherein the method comprises: the periodicity in the first step may be 1 second apart.
4. The method according to claim 1, wherein the method comprises: the periodicity in step one may be 1 minute intervals.
5. The method according to claim 1, wherein the method comprises: the periodicity in step one may be at 1 hour intervals.
6. The method according to claim 1, wherein the method comprises: the periodicity in step one may be at intervals of 24 hours.
7. The method according to claim 1, wherein the method comprises: and a triode inverter circuit is arranged in the microprocessor.
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