VGOES Firmware Changes

Version V1.0.0 to V1.0.1

  • GPS Timed out / Frequency Drift (Oscillator Drift)

    • Certain Oscillators were found to have a large difference in frequency adjustment. This caused some units to drift onto different channels, or for time to become more then 1 second off, and trigger a loop condition, where GPS Timed out is repeated in the event log. Transmissions would be stopped, until the unit was restarted.

    • This bug was also triggered on some units by the Leap Second which occurred on December 31, 2008 - Jan 1, 2009.

    • Frequency adjustments are now more precise, to accommodate the variances in oscillators from different batches.

  • Implemented program checksum, firmware verifies checksum when powered on, and will remain offline unless the checksum is valid.

  • GPS sync will retry at every transmission, even if first sync failed.

  • Perform an extra GPS sync after transmission if the sync before transmission failed.

  • Send a full reset to the GPS module in case sync fails 10 times in a row, or if there has been no successful GPS sync within two days.

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