Flight Software Design STEREO/HET

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Flight Software Design STEREO/HET

• Tom Nolan

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Agenda

• Development environment
• Software and hardware
• Development tools
• Interrupts
• Software design logic
• Support software
• Questions/comments

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Development Environment
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Flight Software Design

• Hardware Environment
• Embedded 24-bit MISC CPU
• 128K words RAM
• 6 prioritized interrupts
• 2 serial ports (1 bidirectional, 1 out only)
• PHA ASIC interface for science data

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Flight Software Design, contd

• Software Environment
• Standalone program, single task
• Interrupt-driven operation
• MISC assembly language
• Development Tools
• MISC 24 assembler (ASM24)
• MISC 24 simulator
• Debug monitor (TMON)
• Interactive debugger (TBUG)
• Serial port interface to TCP/IP (SPiT)

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Flight Software Design, contd

• Boot-up and initialization
• Background loop
• Prioritized interrupts (0 highest priority)
• Int 0 Serial port 0 receiver ready
• Int 1 Serial port 0 transmitter ready
• Int 2 Serial port 1 transmitter ready
• Int 3 PHA event
• Int 4 One second sync
• Int 5 One minute sync

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Flight Software Design, contd

• Boot-up and initialization
• Boot loader transfers program from SEP Central
• Transfer additional code and tables under program
  control
• Initialize ASIC PHA controller
• Initialize memory
• Enable interrupts
• Enter background loop

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Flight Software Design, contd

• Background loop
• Check for and process command received on Serial
  port 0
• Interrupt 0 Serial port 0 receiver ready
• Read character, place in input queue. Carriage
  return or newline increments received command
  count.
• Interrupt 1 Serial port 0 transmitter ready
• Extract next char from output queue, write to
  port. When queue is empty, disable interrupt.

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Flight Software Design, contd

• Interrupt 2 Serial port 1 transmitter ready
• Telemetry output is packet oriented (272-byte
  packets). An array of telemetry packet buffers
  is maintained in software. On each one-minute
  tick, buffers are filled and output pointer is
  reset to the first packet. Subsequent 1-second
  ticks cause a burst of TBD bytes to be written to
  serial port 1.

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Flight Software Design, contd

• Interrupt 3 PHA event ready
• Interrupts are reenabled
• Event is read from PHA ASIC chip
• Science event data processing algorithm is
  performed
• Interrupt 4 One-second sync
• Increment second count 0-59
• Enable serial port 1 (Telemetry) transmitter
• Will disable itself after TBD bytes transferred

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Flight Software Design, contd

• Interrupt 5 One-minute sync
• Read out hardware rate counters
• Transfer accumulated science data to packet
  buffers (counters and compressed events)
• Transfer digital housekeeping data to packet
  buffers
• Reset telemetry output pointer to start of packet
  buffer sequence

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Flight Software Design, contd

• Flight software development snapshot
• Hardware and memory initialization
• PHA chip initialization
• Background loop and command handler
• Interrupt service routines for Ints 0-3 (Command
  in/out, T/M out, PHA event)
• Handles flight-like commands, generates
  flight-like telemetry on a continuous basis
• 2K lines of code, 1KW code, 4KW data

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Flight Software Design, contd

• Other software development milestones
• TMON 2K lines of MISC code, 1KW code, 4KW data,
  runs in MISC 24 during flight software
  development
• ASM24 4K lines of C code, runs in DOS window
• CPU24 Simulator 4K lines of C code, runs in DOS
  window
• TBUG 2K lines of C code, Win32 app
• SPiT 1K lines of C code, Win32 app

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TMON Software

• Debug monitor for MISC assembly language
  development
• Loaded into RAM by boot loader, relocates itself
  to high memory
• ASCII command interface allows program control
  through serial terminal
• Single-step, step over, load program, go, set
  breakpoint, display and modify memory, display
  and modify registers, display stack contents

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TBUG Software

• Win32 Application provides a visual interface to
  TMON
• Operates through direct serial-port connection to
  MISC CPU or socket connection vial SPiT
• Written in C programming language with standard
  Windows interface
• Four on-screen windows
• Source code with current line highlighted
• CPU24 memory,
• registers and stack contents
• Serial port 0 (command) dialog
• Toolbar and menus

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TBUG Screen Shot
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PHA ASIC Chip Commanding

• ASIC chip operational configuration is set up via
  an 846-bit command shift register
• Changing any PHA characteristic requires sending
  the entire shift register
• Flight software handles two kinds of ASIC
  configuration commands
• CMDSTR set entire command shift register
  contents (216 bytes, hex ASCII)
• Individual commands to modify selected fields

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GSE Software Suite

• Tom Nolan
• Kristin Wortman

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Agenda

• GSE configuration
• SPiT software
• Communicator software
• WinMac software
• WinMac modifications for HET
• ASIC PHA chip serial command setup
• Screen shots of WinMac
• WinMac modifications for SIT
• Current status of GSE software
• Questions/comments

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GSE Configuration
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SPiT Software Overview

• Serial port interface to TCP/IP
• Win32 Application written in C, on-screen display
  for diagnostic purposes only
• Handles two serial port connections to flight CPU
  board
• Handles server-side socket connections from
  multiple simultaneous client applications
• Client programs can read and write to serial
  ports
• Permissions are set independently for each client
• Allows multiple access to flight instrument
  command and telemetry, both locally and remotely

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SPiT Packet Formats
Opcode Parameters Description
OP_SES (1) SES_SNDCMD (0x10) SES_RCVCMD (0x20) SES_RCVTLM (0x40) Send commands Receive command response Receives telemetry
OP_CMD 0 Command for delivery to instrument
OP_RSP 0 Command response from instrument
OP_TLM 0 Receive telemetry packet from instrument
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Command List
Keyword Argument Function
cmdstr 108 hex bytes (216 characters) 846-byte command string (left-aligned) plus 18 bits (zeros)
testp test pulser period (hex) Set test pulser period. Argument is in hex, units of 2 microsecs.
rates Read and clear rates.
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WinTCP Software Package
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WinTCP Software Package
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WinTCP Software Package
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HET Telemetry Packet Format (In- House Testing)
Offset (bytes) Size (bytes) Contents
0 11 CCSDS Header
11 1 Packet type (0xe9 event, 0xad rate)
12 1 Sequence number (increments by 1)
13 1 Number of 24-bit words (0-86)
14 258 24-bit ph or rate words (lsb msb)
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Communicator Software

• Windows user interface
• TCP/IP communications with SpiT software
• Sends commands by fields specification
• Receives telemetry packets
• Displays telemetry packets in HEX format

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Communicator Screen Shot
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WinMac Software

• Background
• Developed for the LECR group
• Scientific graphical analysis software package
• Design philosophy based on the original Macro
  program written by Don Reames

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WinMac Software (contd)

• Overview
• C programming language
• Object oriented methodologies
• Microsoft Foundation Class library
• Reads standard LECR formatted data files
• Produces 2 and 3 dimensional plots
• Windows user interface

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Modifications to WinMac

• TCP/IP communications with SpiT software
• Send commands as an ASCII HEX string
• Receive telemetry packets
• Receive command responses
• Display telemetry packets in readable format
  (uncompressed format)

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Modifications to WinMac (contd)

• Plot HET 24 bit pulse height data in histograms
  with calculated mean and standard deviation
• Setup each command bit(s) assignment via a series
  of menus and dialogs
• Provide a command log and telemetry files

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Command Setup Design
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ASIC Chip HET Command Setup

• Menus for command bits setup
• Selectable command
• Command string
• Rates
• Test Pulser timing
• Start stop telemetry data collection to files
• Command Display
• Display rate control
• Send, load and save command string setup

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TCP/IP Communications Setup

• Invoked when needed (first time)
• TCP/IP setup
• IP address
• Port number
• Data description header file selection (LECR
  format)

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ASIC Chip Selectable Command Bits Setup

• Selectable value parameters
• Global selections

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ASIC Chip Input Value Command Bits Setup

• Value input
• Global value setting

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ASIC Chip Individual Command Bits Setup

• Toggle individual bit on and off
• Global settings for set and reset

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HET Packet Display

• Displays the contents of the 24 bit pulse height
  and the rate packets.
• Displays the status of the data collection.

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PHA Histogram

• Histogram plot of the pulse height packet.

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Modifications needed for SIT

• Dialog for serial command setup (TBD)
• Develop a class for the SIT pulse height event

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Future Modifications

• Read the telemetry packet formats produced by
  Caltechs GSE
• Develop a class for the HET pulse height event
  (16 bit)
• Design a routine for plotting pulse height events
  for HET and SIT

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GSE Software Status

• SPiT software is completed
• Communicator software is completed
• WinMac software modifications
• HET modifications for in-house testing of the
  ASICS PHA chip are complete
• HET pulse height event class and plotting routine
  being developed
• SIT pulse height event class and plotting routine
  being developed