Particles and Fields Package Pre-Environmental Review May 22 -23, 2012 Flight Software

1. Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission Particles and Fields Package Pre-Environmental Review May 22 -23, 2012 Flight Software Peter R. Harvey

2. Agenda • PER Requirements • Development Plan & Status • Verification Status • IV&V Status • Design Overview • Central Processor Utilization • EEPROM Utilization • Memory Utilization and Track • Remaining Work

3. PER Requirements Note: There are no NHB 7150 requirements for FSW PER

4. Software Development Plan • Software Products: • Boot FSW (PROM) • Build1 : Support ETU DCB Test, S/C Interface tests • Build2 : Updated, Built for Flight Unit PROM • Operational FSW (EEPROM) • Build1 : Support S/C Interface, ETU Instrument I&T • Build2 : Support Storage Capabilities, Onboard Data Processing, FLT I&T • Build3 : Updated, Built for Flight EEPROM • Command and Telemetry Database • Table Load Scripts • FSW Test Scripts

5. Software Development Status Boot FSW Development • 68 Requirements • 8 required inspection Operational FSW Development • 210 Requirements • 18 require inspection • Requirements in flux • 218 changes (Level 5) • 83 changes since CDR

6. Software Verification Status • Other Tests/Environments • BOOT BUILD2 CPT on DVF • BOOT BUILD2 & OPERATIONAL BUILD1 I&T of all ETU Instruments • LPW • SEP • MAG • SWEA • SWIA • STATIC • PFDPU – S/C ETU Test at LM • PF High Fidelity Simulator to LM Test Bed • OPERATIONAL BUILD2 PF FLT I&T of Instruments • OPERATIONAL BUILD3 Development • Long Duration & CPT on PFDPU ETU

7. IV&V Status • Action Items Remaining • 3 Severity 2 Issues (SEP, EUV, HV safing reqmt not found) • 5 Severity 3 Issues (SEP, EUV, HV, EEPROM, I/F detail suggested) • 1 Severity 4 Issue (Incorrect parent reqmt) • FSW completed all Action Items, Awaiting IV&V concurrence • Impacts to Requirements = 4 additional Level 5, 2 additional Level 4 • No impact to FSW implementation

8. FSW Design Overview Development Plan : MAVEN_PF_SYS_008A Processor : 16 MHz Coldfire IP Memory : 32K PROM, 256K EEPROM, 3 MB SRAM, 8 GB Flash Language: C Deliveries: Boot, Operational, HFS Requirements: 66 (Boot), 210 (Operational) SLOC : ~3777 in 11 modules (Boot), ~14500 in 19 modules (Op) Test Platform: DVF (Development and Verification Facility) Major Functional Requirements: Command Reception & Distribution Engineering Housekeeping Telemetry On-Board Limit Monitoring, Fault Response Relative Time Command Sequences Real-Time Data Collection and Playback Archive Data Collection and Playback Data Compression High Voltage Controls Attenuator Controls Controllers for Six Science Instruments Fault Protection

9. CPU Utilization

10. EEPROM Utilization

11. SRAM Utilization

12. Memory Utilization Simplified NVM to use EEPROM only (no FLASH required).

13. Memory Track PROM Functions Boot Software V1.3 EEPROM Load Uplink Support EEPROM Operational Software V 2.0+ Instrument Drivers Instrument LookUp Tables Relative Time Sequences of commands Limit Monitor Database RESOURCE NEEDS 43% PROM 44% RAM 75% EEPROM 0% LUTs stored in FLASH

14. Work Remaining FSW Development Remaining • GSEOS Development Remaining • Instrument simulation on ETU (MAG2, SEP2) • Instrument ETU’s integrated into PF ETU • Limit checking instrument housekeeping • I&T Test Scripts, DCB Test Scripts • FSW Test Scripts for Operational verification • DeCompression Software

15. Backup Backup Slides

16. Orbit Test Sequence

17. Orbit Test Sequence

18. Long Duration Stress Test (72 Hr) High Rate of Commands Command Pass Simulation Every Hour Memory Load – Uplink of RTS Database (16KB) Serial Commands – 1kbps for 60 seconds Memory Dump RTS Database Simultaneously Executing RTS and Verifying Results High Rate of Telemetry Continuous Telemetry at 200% nominal (10 Kbps) Real Time Data @ 200% (5 Kbps) Burst Playback @ 200% (5 Kbps) CPU Intensive Processing Moment Calculations @ maximum rate (4 second period) Magnetic Vectors @ maximum rate (1 second period) STATIC attenuation @ maximum rate ( 4 second period) Data Compression Enabled on All Available Packets SRAM Memory Scrubbing Enabled Fault Protection @ maximum rate (4 second period) Verification Test Status Logged Every Hour (72 reports) No Errors in FSW or GSE

19. Boot RTS Boot RTS has 5 RTS Sequences defined of 32 possible. RTS is loaded with the program. All RTS can run simultaneously. Commands executed at 4 Hz. RTS are variable length. Each can be enabled/disabled.

20. Operational RTS Operational RTS has 41 RTS Sequences allocated of 64 possible. RTS database is stored in EEPROM.

21. Command/Eng APIDs

22. Science APIDs

23. Science APIDs

24. Science APIDs

25. Data Compression Count Compression Four scales required {19-to-8, 26-to-8, tbd, tbd} Standard lossy encoding Offscale limit checking CPU Use: ~5-6% MAG Delta-Modulator Implemented by GSFC request Compresses 32x3 to 64x3 (8-bit delta) Packet Size is Constant Packet Period changes 19-to-8 encoding

26. Data Compression SPD Compression Spec’d by D. Curtis Modified Huffman encoding 4 encodings attempted Best-of-4 applied Packet compressed at TM Real-time rate req’d

27. Software Deliverable Schedule Deliverables (src:MAVEN-SYS-PLAN-0020 rev B) Operational FSW BUILD3 ATRR, CPT, ATR and AR expected in summer 2012