CN114500985A - Solution to abnormal static electricity of car camera - Google Patents

Abstract

The invention discloses a method for solving electrostatic abnormity of a vehicle-mounted camera. In order to overcome the problems that a chip caused by electrostatic interference reports ERROR to cause a screen to have a transient black screen to influence the use experience and the ERROR signal caused by interference and camera line fault cannot be processed in a distinguishing way in the prior art, the invention adds a plurality of times of delay processing and a plurality of times of judgment after receiving the ERROR, combines the advantages of a screen freezing mechanism and a black screen mechanism, and provides a realization method which can ensure that a user cannot display abnormal influence on the use experience in the daily use process of the camera and can remind the user of the occurrence of problems when the camera and a transmission line have faults; the mechanism can also be applied to other controllable static sensitive devices of a main chip in equipment, and the time delay time can be changed to filter out more types of interference.

Description

Solution to abnormal static electricity of car camera

technical field

The invention relates to the field of electronic equipment, in particular to a method for solving abnormal static electricity of a vehicle-mounted camera.

Background technique

Electrostatic discharge is a common phenomenon in life, especially in a dry environment, static electricity will not cause harm to the human body, but its high two-level transient pulses at equal intervals will interfere with the transmission line of the camera, causing electrical signals on the transmission line to generate Abnormal fluctuations, and abnormal fluctuations in the electrical signal will also occur when the camera or transmission line is abnormal. In the prior art, after the main chip detects abnormal fluctuations in the electrical signal, it will report an ERROR signal. The mechanism of freezing screen or black screen, that is, after receiving ERROR, the previous frame of picture is still displayed or no picture is displayed, and ERROR is ignored until normal picture data is received and the normal picture continues to play; since both can cause ERROR, the system often cannot distinguish correctly. Therefore, the ERROR caused by the camera line failure often shows a long-term freezing or long-term black screen, and the ERROR caused by electrostatic interference is shown as several short black screens, which greatly affects the user experience.

In order to solve the above-mentioned problems, a "electrostatic recovery method, device, electronic device and storage medium" disclosed in Chinese patent documents, its bulletin number CN113342150A, includes performing electrostatic detection on the touch screen to obtain the detection result; if the detection result indicates If the static electricity of the touch screen is abnormal, the reset state of the touch program is determined. In the case of abnormal static electricity of the touch screen, the touch program is interrupted when the static electricity of the touch screen is reset and the static reset of the touch screen is completed. Trigger the reset of the touch program; if the reset state of the touch program is abnormal reset, perform an electrostatic reset operation on the touch screen. This solution intends to reduce the influence of static electricity on the black screen or freeze screen phenomenon of the display by means of multiple resets, but it is impossible to distinguish the difference between the static electricity interference and the chip upload fault on the display interference.

SUMMARY OF THE INVENTION

The invention mainly solves the problem in the prior art that the static interference causes the chip to report ERROR, causing the screen to appear black for a short time, which affects the user experience, and the ERROR signal caused by the interference and the camera line failure cannot be differentiated. Adding multiple delay processing and multiple judgments after receiving ERROR, combined with the advantages of the freeze screen mechanism and the black screen mechanism, provides a processing method that does not affect the user experience, and at the same time reminds the user of the camera and transmission line failure, which can filter In addition to the ERROR signal caused by interference, it also handles the ERROR caused by the camera line failure.

The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions:

The invention includes the following steps: receiving the ERROR signal reported by the main chip, monitoring the chip state with a segment delay mechanism, and regulating the content displayed on the display working screen according to the monitoring result; digital signal transmission transmits binary signals through high and low levels, wherein high level = 1. Low level = 0, abnormal fluctuations in transmission will cause the high level to become low or the low level to become high, which will cause the system to judge the high and low levels incorrectly, which will cause the camera and transmission line to fail. After the chip detects a fault, it reports ERROR.

Preferably, the segmented delay mechanism includes a monitoring stage, a delay stage and a re-monitoring stage; in the monitoring stage, the main chip is monitored to report information, the monitoring of the main chip is suspended in the delay stage, and the main chip is monitored again in the re-monitoring stage to report information; The delay stage is added after the monitoring stage to eliminate ERROR caused by electrostatic interference or other forms of interference.

Preferably, the monitoring phase includes the following contents: detecting the type of information reported by the main chip, and if the reported information is not an ERROR signal, keep monitoring continuously; if the type of the reported information received is an ERROR signal, enter the delay phase.

Preferably, the delay stage includes the following content: set the delay time slice as T, the delay stage maintains the normal picture before receiving the ERROR signal until the end of the time slice T, and enters the re-monitoring stage, the delay time slice T needs to After the specific frame number setting, it is generally set to 50 milliseconds.

Preferably, the delay stage further includes the following contents: the main chip sends an interrupt signal to the control chip on the camera transmission line, and a forced reset is performed on the control chip. The function of the reset is to eliminate the negative impact of electrostatic interference, thereby ensuring the built-in components. It can still work normally and stably after being disturbed.

Preferably, the re-monitoring stage includes the following steps: detecting the information reported by the main chip for the second time, if the main chip reports the ERROR signal again, it enters the abnormal prompt state; if the main chip does not report the ERROR signal this time, it continues to display The picture transmitted by the camera, and immediately return to the monitoring stage to continue to monitor the information reported by the main chip.

Preferably, in the abnormal prompt state, a time slice X is set, and a completely black screen is displayed in the abnormal prompt state until the time slice X ends. The time slice in the abnormal prompt state should not be too long, and the actual number of frames and the test situation are required. Adjustment.

Preferably, the size range of the time slice T is set to 1 to 50 milliseconds, the size range of the time slice X is set to 17 to 50 milliseconds, and the number of picture frames displayed is generally 24/48/60 frames per second, and each frame The time is from 17ms to 50ms, so the settings of time slice T and time slice X need to be determined according to the actual test situation. If the time slice is set too long, the abnormal picture will be too obvious. If the time slice is set too short, it will not be able to cover the interference duration. .

The beneficial effects of the present invention are: by utilizing the characteristic of short electrostatic discharge interference time, a delay judgment mechanism is added, and the judgment is made again after the static electricity disappears, which effectively avoids the abnormal screen display caused by the system judgment error, and filters out the abnormal screen display that will interfere with the system judgment. This scheme combines the black screen mechanism and the freeze screen mechanism in an orderly manner through the delay judgment mechanism, and combines the advantages of the two to ensure the user's safety while avoiding the frequent black screen phenomenon caused by electrostatic discharge interference.

Description of drawings

FIG. 1 is a flow chart of the method for solving the static electricity abnormality of the vehicle-mounted camera of the present invention.

Detailed ways

The technical solutions of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

Example 1:

The solution to the abnormal static electricity of the vehicle camera in this embodiment is shown in Figure 1. After being interfered, the main chip reports the ERROR of the camera and the transmission line, first maintains the normal picture of the previous frame, and delays for a period of time when the static electricity interference is small. Judge again whether ERROR still exists. If the main chip reports ERROR again, it is determined that the camera and transmission line are faulty, and a black screen is displayed to remind the user that there is a problem with the camera and transmission line. If the main chip no longer reports ERROR, it is determined that the camera and transmission line have problems. Affected by electrostatic discharge interference, the camera transmission line is normal, and the normal picture of subsequent transmission continues to be displayed.

Specific steps are as follows:

Step 1: Detect whether the main chip reports ERROR of the camera and transmission line, if no ERROR is received, continue to keep the monitoring state; if ERROR is received, go to step 2;

Step 2: Maintain the normal picture of the previous frame before receiving ERROR;

Step 3: Delay T seconds, during which the control chip on the camera transmission line is reset once, that is, the state of the transmission line is reset;

Step 4: Monitor again whether the main chip reports the ERROR of the camera and the transmission line. If the main chip reports the ERROR again, it will display a black screen, prompting the user that there is a problem with the camera and the transmission line; if the main chip does not report the ERROR, go to step 5;

Step 5: Continue to display the picture transmitted by the camera, and jump back to Step 1 to continue the detection.

The value range of the parameter X in step 3 should be greater than the duration of electrostatic discharge to ensure that the electrostatic interference has completely disappeared during the second detection. After taking into account factors such as electromagnetic waves and transmission delay, it is obtained that X>1S Value range; the display screen is generally composed of continuous static frames. The more frames covered by the experiment time, the longer the screen is stuck. In order to weaken the freezing screen perception, the value of X is generally limited by the duration of the screen frame. , generally set to 50 milliseconds.

In this embodiment, the main chip can judge whether the communication between the camera and the transmission line is normal, and generate a corresponding interrupt signal to report the status; the main chip can also control the screen displayed on the display screen; in addition, the main chip can also control the camera transmission line. The control chip on the line , and send an interrupt signal to it for forced reset, so as to repair after electrostatic interference; in addition, the fixed value of X in this embodiment needs to be adjusted according to the number of display frames and the actual test situation.

The solution to the static abnormality of the vehicle camera in this solution combines the advantages of the black screen mechanism and the freezing screen mechanism, and provides a solution that can ensure that the camera will not display abnormality during daily use and affect the user experience. The realization method of reminding the user of the problem in time when a fault occurs, this mechanism can also be applied to other electrostatic sensitive devices controllable by the main chip in the device, and the delay time can also be changed to filter out more types of interference.

It should be understood that the embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Claims (8)

1. A method for solving abnormal static electricity of a vehicle-mounted camera, characterized in that it comprises the following steps: S1: Receive the ERROR signal reported by the main chip; S2: Monitor the chip status with a segmented delay mechanism; S3: The content displayed on the display screen is regulated by the monitoring result. 2. The method for solving static electricity abnormality of a vehicle-mounted camera according to claim 1, wherein the segmented delay mechanism comprises a monitoring stage, a delay stage and a re-monitoring stage; in the monitoring stage, the monitoring main chip reports information, and in the delay stage Pause the monitoring of the main chip, and monitor the main chip again to report information in the re-monitoring stage. 3. The method for solving the static abnormality of a vehicle-mounted camera according to claim 2, wherein the monitoring phase includes the following content: detect the information type reported by the main chip, if the reported information is not an ERROR signal, keep monitoring continuously; If the type of the reported information is ERROR signal, it will enter the delay stage. 4. The method for solving the static abnormality of the vehicle-mounted camera according to claim 2, wherein the delay stage comprises the following content: setting the delay time slice to be T, and the delay stage maintains the normal picture before receiving the ERROR signal until The time slice T ends, and the re-monitoring phase is entered. 5. The method for solving the abnormal static electricity of a vehicle-mounted camera according to claim 4, wherein the delay stage further comprises the following content: the main chip sends an interrupt signal to the control chip on the camera transmission line, and a forced reset is performed for the control chip . 6. The method for solving the static abnormality of a vehicle-mounted camera according to claim 2, wherein the re-monitoring stage comprises the following steps: detecting the information reported by the main chip for the second time, and if the main chip reports the ERROR signal again, the abnormality is entered. Prompt status; if the main chip does not report the ERROR signal this time, it will continue to display the picture transmitted by the camera, and immediately return to the monitoring stage to continue to monitor the information reported by the main chip. 7 . The method for solving static electricity abnormality of a vehicle-mounted camera according to claim 5 , wherein, in the abnormal prompt state, a time slice X is set, and a black screen is displayed in the abnormal prompt state until the time slice X ends. 8 . 8. The method for solving static electricity abnormality of a vehicle-mounted camera according to claim 4 or 7, wherein the size range of the time slice T is set to 1 to 50 milliseconds, and the size range of the time slice X is set to 17 to 50 milliseconds .

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