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Systematic Embedded Software Gerneration from SystemC

Systematic Embedded Software Gerneration from SystemC. Contents. Abstract Introduction Software Generation Application Example Conclusion. Abstract. Systematic embedded software generation method Software generation cost reduction HW/SW codesign methodology

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Systematic Embedded Software Gerneration from SystemC

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  1. Systematic Embedded Software Gerneration from SystemC

  2. Contents • Abstract • Introduction • Software Generation • Application Example • Conclusion

  3. Abstract • Systematic embedded software generation method • Software generation cost reduction • HW/SW codesign methodology • embedded system based on SystemC • Goal • The same SystemC code • system level spec, verification, SW/HW co-simulation, embedded software generation (after SW/HW partition) • C++ code (for SW partition) • user selected embedded OS

  4. Introduction • Embedded software • 80% of embedded system development costs. • Embedded system • RTL description for HW part and SW part seperately. • The lack of unifying system specification language. • SystemC • one of the most promising proposals. • efficient SW generation & interface synthesis

  5. Introduction (cont’) • Efficient embedded software and interface generation methodology from SystemC • Redefinition & overloading of SystemC class library el- ements • Original code • call the SystemC function to process concurrency & commu- nication • New code • call the RTOS function that implement the equivalent functio-nality • SystemC functions are replaced by typical RTOS func- tions in the generated software. • Independent of the embedded RTOS

  6. Software Generation • Embedded software • generated from system specification after SW/HW partition • SW code including several RTOS function calls to process concurrency and synchronization • a close relationship between RTOS and SystemC kernel fun ction that support concurrency • SystemC channel use notify & wait constructions to synchroni- zation the data transfer and process execution • RTOS use different mechanisms for this tasks (interruption, m- utex, flags, … ) • Every SystemC channel can be implemented with different RT- OS functions.

  7. Software Generation (cont’) • Main idea • Software generation method is based on correlation. • Replacing SystemC library elements by equivalent procedures based on RTOS functions.

  8. Software Generation (cont’) • Proposed SW generation flow.

  9. Software Generation (cont’) • SystemC elements replaced

  10. Software Generation (cont’) • SystemC description example

  11. Application example • Anti-lock Braking System (ABS) • ARM7TDMI processor • eCos as embedded RTOS • SystemC-to-eCos Library (SC2ECOS) • Ecos functions called by the SC2ECOS Library

  12. Application example (cont’) • Memory footprint for the ABS SW implementation

  13. Conclusions • Embedded software generation method based on SystemC • Reducing the embedded system design cost in HW/SW codesign • Same SystemC is used for system level spec. after SW/HW parti- tion • Redefinition and overloading SystemC class library contruction elements. • Elements are replaced by RTOS functions. • Independent of the selected RTOS • Supported by writing the corresponding library for that replacement

  14. Conclusions (cont’) • Experimental results • The minimum memory footprint is 53.2Kb when the eCos RTOS is used. • This overhead is relatively low taking into account the great advantages that it offers.

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