How a reset affects the Symphonie Logger

The logger averages a short interval. That is, there are less than 10 minutes of samples averaged for the interval during which the reset occurred. The logger then creates a new file when it resets. MMC cards have to be written in 512 byte blocks. This is a whole hour of data. So, to insure against data loss, Symphonie uses a two-step writing process. Symphonie stores each 10-minute interval data to internal (non-volatile) memory. At the top of each hour, the (usually six) 10-minute averages in internal memory fill one 512 byte sector, and are copied to the MMC card. Once the MMC card acknowledges the write cycle, the internal memory space is marked for re-use in the logger. Here is, in order, what happens at Reset...

1) All hardware is reinitialized (counters, processors, display, MMC card...) Analog excitation is locked on for 5 seconds and the EE memory (logger settings) signature is checked. If the EE contents are valid, they are copied to RAM for the logger to work with, if the contents are corrupt, factory default settings are reloaded from the firmware as follows: Site = Serial Number Clock = boot date (changes with fw rev; current example is 12:01 7 March 2004) Time zone = 0 Rev = Rev Model = Model lat, long, altitude = 0 Units = SI (metric) Encryption PIN = 0

2) The logger scans the SCM types so it can set up the accumulators in the proper modes.

3) All the averaging interval accumulators" (averaging and max/min in process) are cleared and re-started.

4) Sampling begins, every 2 seconds

5) Whatever file was open is closed; the PREVIOUS hour's data (already written) will be the last in that file.

6) A new file is created in internal memory. It has a new header with the latest settings - a "flag bit" has also been set in the header so that NRG SDR software can warn the user that a configuration change may have occurred, and the file should be checked for changes.

7) The first data in this new file will have the data from the hour in progress that was waiting in internal memory (remember that the internal memory is non-volatile and does not get wiped out on a reset), if any. Oddly, this means that some of the data will be from BEFORE the file start time. If the reset occurs during the first 10 minutes of the hour, there are no intervals waiting in internal memory, so this does not apply.