SDR7 Instrument SW cai

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ISUAL Instrument Software: 

ISUAL Instrument Software C. Ingraham

Instrument Software Overview: 

Instrument Software Overview Command Processing Instrument Control Camera SpectroPhotometer Array Photometer Memory Allocation, Data Compression Telemetry Generation Filter Wheel Control Operation Sequencing

Instrument Software Overview: 

Instrument Software Overview DPU 8085 processor Assembly Language, heritage from IMAGE/FUV Primary purpose: Overall control and sequencing DSP Fast Signal Processor Software developed by NCKU Primary purpose: Data Compression

Command Processing: 

Command Processing Commands may be received at any time and buffered in a queue. Commands are read from queue and executed as soon as possible Echo telemetry generated for all commands, as they are executed Command Echo goes out Command Status port Extra enabling command required before critical commands When enabling HV, command requires 4 code bytes, which are sent into the hardware

Command Processing (cont): 

Command Processing (cont) Some commands will set multiple parameters No automatic turn on of HV. A command is always required to turn on a HV power service “SAFE” command turns off HV and most other power services, and puts ISUAL in Standby mode. Time-tagged commands are stored in the spacecraft, and sent from there to ISUAL, when tagged time arrives Commands are generated by a ground station, using STOL or another procedure language

Instrument Control: 

Instrument Control Set Parameters Allocate Readout Memory Turn on/off Power Services Handle Sprite Events, or Initiate scheduled readouts

Memory Allocation: 

Memory Allocation Memory for every camera readout Memory for every photometer group readout Memory for the results of data compression Memory for building Telemetry products

Data Compression: 

Data Compression All compression is done by the DSP Memory is shared between DSP and DPU DPU allocates memory and schedules jobs for the DSP

Telemetry Generation: 

Telemetry Generation Telemetry products are generated as CCSDS source packets Packets are broken up into PVCFs and accumulated in memory until a 64 megabit Block is filled Block is transferred to spacecraft as a series of PVCF transmissions Telemetry is sent to spacecraft, primarily during Dayside transit Telemetry is transmitted using DMA, one PVCF at a time

Command Status: 

Command Status Command Echoes and other real-time status is sent out the Command Status channel, which is different from the Telemetry channel Command Status data is transmitted as CCSDS source packets, but using asynchronous serial I/O A sync pattern will precede each Status packet

Filter Wheel Control: 

Filter Wheel Control Stepper Motor Fixed number of steps between filters “Home” status signaled on first filter Motion is in one direction only Position is resynchronized on each passage of “Home”

Slide12: 

Sprite Event Raw readout Compressed Images Sprite Product ---Instruments--- --Mass memory--------------- --Telemetry-- Operation Sequencing

Slide13: 

Data Flow - Acquisition

Slide14: 

Data Flow - Compression & Telemetry

Operational Modes: 

Operational Modes Standby Data-Taking Sprite Aurora Dayside Data Processing Note: HV turn-on is never automatic. A command is always required.

Standby Mode: 

Standby Mode No Data Taking Basic Housekeeping telemetry -- voltages, currents, temperatures Command Processing Note: at any time, a SAFE command will shut off all HV and switch to Standby Mode.

Data-Taking Mode : Aurora: 

Data-Taking Mode : Aurora Camera takes fixed-exposure at regular intervals; various filters set Photometer Data sampled at regular intervals Housekeeping Telemetry Command Processing

Sprite Mode: 

Sprite Mode Data taking synchronized with a Sprite Event. DPU gets an interrupt and notes the time. When a camera readout is complete, DPU stamps the time and passes the data on for compression and science telemetry. Same for Photometers. Command processing (as time is available)

Dayside Data Processing: 

Dayside Data Processing No Data Taking Data Compression from accumulated nightside raw data Telemetry Generation. Command Processing Note: at any time, a SAFE command will shut off all HV and switch to Standby Mode.

Software Development: 

Software Development Design Plan Development Tools & Platforms Test Plan

Design Plan: 

Design Plan Central Control by DPU DSP treated as a peripheral Inter-Module communication uses Shared Mass Memory

Development Tools & Platforms: 

Development Tools & Platforms Heritage from IMAGE/FUV 8085 Assembler, Linker Test Pod Reset and Function Switches 8085 debugger Upload into RAM Debug display on monitoring PC

Test Plan: 

Test Plan Documents ISUAL Requirements Document Interface Control Documents Simulators Development Milestones

Simulators: 

Simulators ISUAL Simulator developed from DPU breadboard Spacecraft Simulator Testing ISUAL Developing Ground Data Processing Software

Development Milestones: 

Development Milestones Established by Project Management Defined Hardware Configuration Defined Level of System Integration Formal Test: list of objectives specific functional requirements to be satisfied

Version Control: 

Version Control CVS Software Central Repository Parallel Development Log of changes Ability to Reconstruct Previous/Alternate Versions

Software Modules: 

Software Modules SEQ FWHEEL SPHOT APHOT DSP TLM CMD SC_OUT SC_IN Parameter and Mode Control Table POWER CAMCTL Spacecraft: Command, Status, Telemetry Photometers Camera Filter Wheel Data Compression Overall Sequence Control