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Re: [Paparazzi-devel] How to Synchronizing the two Tiny boards?

From: Prof. Dr.-Ing. Heinrich Warmers
Subject: Re: [Paparazzi-devel] How to Synchronizing the two Tiny boards?
Date: Sat, 27 Oct 2012 12:27:50 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; de-DE; rv:1.4) Gecko/20030619 Netscape/7.1 (ax)

Hi Autumn,
we made a time step message  based on the  GPS data  all 0.5s.
You can use the internal time pulses generated by the timer and send them down with the data you want to have (only a 32 bit integer). After a flight we analyse the sd stored files and generate and sort the the data a function of time by a small script program.
This is a way with now changes to any program code.
You have only to generate new messages.
You can use the paparazzi plot function to show  the data.
Pleas read the documentation in the wiki.
The Openlog is a small and low cost pcb (<20$) with a ATmega writing a FAT system on a micro sd card.



Zhang Qiuchen schrieb:

Hello everybody!

My name is Autumn and I'm working on a system that uses paparazzi on a Tiny 
v2.11 board (with LPC2148 as the main processor). I added a TWOG in addition to 
the main autopilot Tiny to take data from some sensor and log them to a SD 
card. However, the data that is logged in the SD card and the data sent back 
via telemetry has non-matching time stamps. I wonder if I can synchronize the 
two processors by configure the TWOG to use external clock and physically 
connect the clock pin from Tiny to the TWOG.

Have anybody ever met problems on asynchronized data from two processors or 
between telemetry data and data stored on board?

Thank you all for reading this and anything information you'd like to share!!!


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