GSi TYMPSTAR 1, Service Manual

Page: 183 / 224

Hardware Description
21. The Remote thread is loaded (to handle both incoming and outgoing serial
packets).
22. The Key thread is loaded (to handle both hardkeys and softkeys but not key-
board).
23. The Plotting thread is loaded (to handle graphics plots during testing).
24. The DPRAM thread and ISR are loaded to handle DPRAM interrupt requests.
25. The Printer thread is loaded and the printer buffers are initialized (print function-
ality is now available from this point forward).
26. The printer is then initialized – and the unit checks for the presence of the
Internal printer (a printer SELECT line is used for this). Globals are updated in
memory to let the rest of the system know if the internal printer is present.
27. The watchdog is now enabled as long as the unit is entering NORMAL
mode (check dipswitches). In CAL or DIAG mode, we keep the watchdog
disabled. From this point forward in NORMAL mode, we will be strobing and
checking the watchdog looking for possible system failures (will failsafe if the
watchdog check fails).
28. Now the low-level system is initialized - control is passed to the set_op_mode()
function which can now use all of the drivers and threads in the system.
Set_op_mode() 29. The unit checks to ensure that this CP.EXE application version is legal – that is
a V2 system must have a valid lock and key code existing on the DOC. If not,
the system will bypass the normal startup and enter the user directly into the
V2 lock/keycode entry menu.
30. Instrument Options are read – all user stored values are read from DOC (if they
don’t exist or are an invalid version failsafe is implemented – this is a
COMMON failure when upgrading systems – if the release notes state that
user data files have changed, new GSI USER/KEY data must be loaded
through the CAL DE-FAULTS menu). If entering CAL mode, the read of
Instrument Options is omitted (since the user might need to reload them).
31. During instrument options read – the UART is initialized with the proper baud
rate settings. The date and time format is updated – the unit is now ready
to display time on the upper corner of the screen.
32. The “GSI TympStar” logo is displayed on the LCD and CRT (both driven at the
same time). This is the first graphic output to the LCD/CRT since it was
initialized.
33. Version numbers and SN are displayed next. The CP rev, Probe S/N, FPGA
rev are displayed as those systems are up and running. The SP is not running
yet.
34. The SP is initialized and started running (taken out of reset).
35. The SP Rev is obtained from the DPRAM and displayed to the LCD/CRT.
36. The SEREE is read in its entirety and copied to CP shadow memory for fast
lookups as requested by the CP and SP. This takes about 12 seconds.
37. The pump system is now homed. This is the first pneumatic system movement.
We check to ensure that the pump is in the home position.
38. Send the click-rate as stored on the DOC to the SP.
GSI TympStar Version 1 and Version 2 Service Manual 7 - 3