SPRUIU9C August   2020  – October 2025 TMS320F280033 , TMS320F280034 , TMS320F280034-Q1 , TMS320F280036-Q1 , TMS320F280036C-Q1 , TMS320F280037 , TMS320F280037-Q1 , TMS320F280037C , TMS320F280037C-Q1 , TMS320F280038-Q1 , TMS320F280038C-Q1 , TMS320F280039 , TMS320F280039-Q1 , TMS320F280039C , TMS320F280039C-Q1 , TMS320F280040-Q1 , TMS320F280040C-Q1 , TMS320F280041 , TMS320F280041-Q1 , TMS320F280041C , TMS320F280041C-Q1 , TMS320F280045 , TMS320F280048-Q1 , TMS320F280048C-Q1 , TMS320F280049 , TMS320F280049-Q1 , TMS320F280049C , TMS320F280049C-Q1 , TMS320F28P550SG , TMS320F28P550SJ , TMS320F28P559SG-Q1 , TMS320F28P559SJ-Q1

 

  1.   1
  2.   Live Firmware Update Without Device Reset on C2000 MCUs
  3.   Trademarks
  4. 1Introduction
  5. 2Key Innovations
  6. 3Building Blocks for LFU
  7. 4Details of Proposed Solution
    1. 4.1 Flash Bank Organization
    2. 4.2 LFU Concepts and Factors Impacting Performance
    3. 4.3 Hardware Support for LFU
      1. 4.3.1 Multiple Flash Banks
      2. 4.3.2 Interrupt Vector Table Swap
      3. 4.3.3 RAM Block Swap
      4. 4.3.4 Hardware Register Flags
    4. 4.4 LFU Compiler Support
    5. 4.5 Application LFU Flow
  8. 5Results and Conclusion
  9. 6Example Implementations
  10. 7Revision History

5 Results and Conclusion

In Figure 5-1, the steps that occur prior to the LFU switchover are depicted: download firmware and program Flash bank, LFU Compiler Initialization routine (the function __TI_auto_init_warm()), then LFU specific initializations in main() (the function init_lfu()).

Steps Before LFU Switchover Figure 5-1 Steps Before LFU Switchover

Figure 5-2 illustrates the actual LFU switchover. The topmost waveform (00) represents the LFU switchover, the second waveform (01) represents the ISR CPU load (80% for old firmware and 40% for new firmware), and the bottom waveform (03) represents the regulated output voltage. The switchover occurs in 0.6µs (or 72 CPU clock cycles), which includes function calls and GPIO set/reset times. Switchover occurs about 40 cycles after the ISR ends. It takes about 20 cycles to exit the ISR, and then about 15 cycles to exit the loop that is waiting for the correct time to switchover.

LFU Switchover Steps Figure 5-2 LFU Switchover Steps

This application note demonstrates the systematic implementation of LFU for real-time control applications and specifically high availability systems needing operation without downtime. Switchover to new firmware is able to be completed within 10 seconds of CPU clock cycles with the available LFU building blocks, including a novel application LFU software flow, hardware LFU support, and Compiler LFU support.