Embedded hardware-assisted track tracking synchronization method in distributed environment
A distributed environment, hardware-assisted technology, applied in electrical components, time-division multiplexing systems, instruments, etc., can solve problems such as high cost, and achieve the effect of eliminating time delay and facilitating time accuracy.
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[0037] Example 1
[0038] In order to test the synchronization error between multiple distributed acquisition devices, the experiment selected chrony software and UM220-III Beidou / GPS navigation module to build an NTP system, selected 1 Raspberry Pi 3B+ as the NTP server, and 2 Raspberry Pi 3B as the NTP server Distributed acquisition equipment, 1 STM32F103RCT6 development board as the tested target. The tested target executes the standard mailbox queue engineering code generated by STM32CubeMx and adds the GPIO flip code with a period of 1ms to it. Set two distributed collection devices to run the GPIO collection program at the same time to collect the GPIO flip of the tested target, and use sys The gettimeofday function in / time.h marks the Unix timestamp, and the final collection result is as figure 2 Shown. The time stamp format is a combination of year, month, day, hour, minute and second in Beijing time and its corresponding Unix timestamp. figure 2 On the left is the Un...
Example Embodiment
[0039] Example 2
[0040] Associating internal and external timestamps, the experiment selected 1 Raspberry Pi 3B as the distributed acquisition device, 1 STM32F103RCT6 development board as the tested target, 1 CY7C68013A for tracking data acquisition, and CY7C68013A was connected to the distributed acquisition device through the USB interface. The tested target executes the standard mailbox queue engineering code generated by STM32CubeMx, and adds the GPIO flip code with a cycle of 1ms. See image 3 , First stop the running of the tested target and download the tested engineering code, and then start the GPIO collection program (collecting GPIO in interrupt mode and marking the Unix timestamp) and SWO collection program (operating CY7C68013A), because the running of the tested target is not restored There is no GPIO flip and tracking data coming, these two programs enter the ready state, and then the tested target is restored, and the tested target executes the program. At this ...
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