1. MAVEN CDR May 23-25, 2011 Particles and Fields Package Pre-Environmental Review May 22 -23, 2012 Flight Software Peter R. Harvey Mars Atmosphere and Volatile EvolutioN (MAVEN) Mission

2. 1-2 MAVEN IPER May 22-23, 2012 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. 1-3 MAVEN IPER May 22-23, 2012 PER Requirements Note: There are no NHB 7150 requirements for FSW PER

4. 1-4 MAVEN IPER May 22-23, 2012 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. 1-5 MAVEN IPER May 22-23, 2012 Software Development Status Operational FSW Development -210 Requirements -18 require inspection Requirements in flux -218 changes (Level 5) - 83 changes since CDR Boot FSW Development -68 Requirements -8 required inspection

6. 1-6 MAVEN IPER May 22-23, 2012 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. 1-7 MAVEN IPER May 22-23, 2012 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. 1-8 MAVEN IPER May 22-23, 2012 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. 1-9 MAVEN IPER May 22-23, 2012 CPU Utilization

10. 1-10 MAVEN IPER May 22-23, 2012 EEPROM Utilization

11. 1-11 MAVEN IPER May 22-23, 2012 SRAM Utilization

12. 1-12 MAVEN IPER May 22-23, 2012 Memory Utilization Simplified NVM to use EEPROM only (no FLASH required).

13. 1-13 MAVEN IPER May 22-23, 2012 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. 1-14 MAVEN IPER May 22-23, 2012 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. 1-15 MAVEN IPER May 22-23, 2012 Backup Backup Slides

16. 1-16 MAVEN IPER May 22-23, 2012 Orbit Test Sequence

17. 1-17 MAVEN IPER May 22-23, 2012 Orbit Test Sequence

18. 1-18 MAVEN IPER May 22-23, 2012 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. 1-19 MAVEN IPER May 22-23, 2012 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. 1-20 MAVEN IPER May 22-23, 2012 Operational RTS Operational RTS has 41 RTS Sequences allocated of 64 possible. RTS database is stored in EEPROM.

21. 1-21 MAVEN IPER May 22-23, 2012 Command/Eng APIDs

22. 1-22 MAVEN IPER May 22-23, 2012 Science APIDs

23. 1-23 MAVEN IPER May 22-23, 2012 Science APIDs

24. 1-24 MAVEN IPER May 22-23, 2012 Science APIDs

25. 1-25 MAVEN IPER May 22-23, 2012 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. 1-26 MAVEN IPER May 22-23, 2012 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. 1-27 MAVEN IPER May 22-23, 2012 Software Deliverable Schedule Deliverables (src:MAVEN-SYS-PLAN-0020 rev B) Operational FSW BUILD3 ATRR, CPT, ATR and AR expected in summer 2012