Reusable software components for on-board systems

Boot Software and Board Support Package for SAMV71Q21(RT) and SAMRH71F20

Main Features

Ready to deploy reusable software items qualified for ECSS standards

Criticality B

Bootloader and Board Support Package pre-qualified for ECSS category B

ECSS compliant

Developed during ESA contracts in compliance to ECSS-E-ST-40C and ECSS-Q-ST-80C

BSW based on ESA SAVOIR

European Space Agency Flight Computer Initialization Sequence Generic Specification

High code and decision coverage

Code and decision coverage required by ECSS standards

Technical highlights

• Model based PUS-C TC/TM stack developed using ASN.1/ACN modelling supported by ESA asn1scc compiler
• Self test of the critical CPU modules
• Failure reporting through boot and death reports
• Bare metal design (no RTOS used)
• ESA ECSS qualification test suite and data pack
• Execution from internal or external non-volatile memory

TC/TM link

• PUS-C TC/TM stack with data model defined in ASN.1
• TC/TM link available on UART and SpaceWire interface
• Possibility to update TC/TM interface to CAN and Ethernet
• Functionalities provided by PUS-C services: 1, 3, 5, 6, 9, 17, 20
• Delivered with ASN.1 source files and ICD generated by asn1scc compiler

Self-test features

• Initialization self-test performing following checks
• Bootloader integrity
• SRAM and SDRAM memory tests
• Selected serial interfaces

Configurability

• Configuration vector allowing to:
  • set default application software image header
  • select bootloader standby mode
  • disable/enable memory caches
  • disable self-testing
• Additional custom configuration and delta qualification possible

Demonstration version

• BSW demo working on SAMV71 Xplained Ultra and SAMRH71F20-EK
• TC/TM link available on UART interface
• Limited application image size to 16KiB
• Internal Flash and SRAM supported
• Example ASW with LED blinking
• GUI loader application for Windows and Linux

Technical highlights

• Static memory allocation
• Object-oriented design
• No dependency on any external library
• Used as a base for BSW – tested in flight software
• ESA ECSS qualification test suite and data pack

Drivers supported

• FPU – Floating Point Unit
• GMAC – Ethernet
• MCAN – Controller Area Network
• MPU – Memory Protection Unit
• NVIC – Nested Vectored Interrupt Controller
• PIO – Parallel Input/Output Controller
• PMC – Power Management Controller
• PWM – Pulse Width Modulation Controller
• RSTC – Reset Controller
• RSWDT – Reinforced Safety Watchdog Timer
• RTC – Real-time Clock
• RTT – Real-time Timer
• SCB – System Control Block
• SDRAMC – SDRAM Controller
• SPI – Serial Peripheral Interface
• SUPC – Supply Controller
• SYSTICK – System timer
• TC – Timer Counter
• TWIHS – Two-wire Interface
• UART – Universal Asynchronous Receiver Transmitter
• WDT – Watchdog Timer
• XDMAC – DMA Controller

SAMV71Q21 only

• AFEC – Analog Front-End Controller
• DACC – Digital Analog Converter Controller
• EEFC – Enhanced Embedded Flash Controller
• ISI – Image Sensor Interface
• LPOW – Low-power modes
• QSPI – Quad Serial Peripheral Interface

SAMRH71F20 only

• HEFC – Hardened Embedded Flash Controller
• FLEXCOM – Flexible Serial Communication Controller
• FLEXRAMECC – FlexRAM Memory and Embedded Hardened ECC Controller
• HEMC – Hardened External Memory Controller (including HECC)
• HSMC – Hardened Static Memory Controller
• MATRIX – Bus Matrix
• SPW – SpaceWire
• TCMHECC – TCM Hardened Error Correction Code

RTEMS integration layer

• RTEMS BSP implementation based on ECSS qualified BSP
• RTEMS BSP is a minimal set of drivers needed for booting RTEMS on the target platform
• It includes wrappers for the SYSTICK, RTC and UART drivers for the N7S BSP
• All drivers from the ECSS qualified BSP can be integrated into RTEMS – the code is portable and the IRQ layer of the drivers is an abstraction, hat can be integrated by users with both bare-metal and RTOS-based applications.