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ISUAL Flight Software Flowcharts. Drawing 8858-T7B 15-November-2002. Overview. This document augments 8857-W7, the ISUAL Flight Software Maintenance Guide It presents a Public Domain copy of the flow charts documenting the internal tasks of the flight software. Software Tasks.

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isual flight software flowcharts

ISUAL Flight Software Flowcharts

Drawing 8858-T7B

15-November-2002

overview
Overview
  • This document augments 8857-W7, the ISUAL Flight Software Maintenance Guide
  • It presents a Public Domain copy of the flow charts documenting the internal tasks of the flight software.
software tasks
Software Tasks
  • ISUAL Flight Software uses a non-preemptive multi-tasking system.
  • A task is an independent code thread, with its own stack.
  • Program flow switches from one task to another when a task executes a call to a function "task".
software tasks continued
Software Tasks (continued)
  • A call to "task" results in a switch to a new stack, and resumption of execution from where another task made a call to "task".
  • Interrupt service routines never change the current task, but an interrupt service routine may change the state of some data in memory, which can eventually cause the current task to do a switch.
isual flight software has 8 tasks
ISUAL Flight Software has 8 tasks
  • BG Task - Background loop
  • Command Task - process commands
  • SOH Task - SOH telemetry generator
  • Supply Task - Supply queue reader
  • DCM task - Control of the DCM
  • TM Task - Science telemetry PVCF generator
  • SC Task - Transmitter to Spacecraft
  • HTR Task - Operates the heaters