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CMSIS-RTOS2 Blinky Low Power Example

The 'Blinky' project is a simple CMSIS-RTOS2 Keil RTX5 based example for ARM 'Musca-S1 CM33 #0' device using ARM 'V2M-Musca-S1' Evaluation Board. Compliant to Cortex Microcontroller Software Interface Standard (CMSIS).

Example functionality:

  • Clock Settings:
    • XTAL    =          50.00 MHZ
    • SYSCLK  =          50.00 MHz
  • one LED is flashing  with a fixed speed.

The Blinky program is available in different targets:

  • Debug:
    • Compiler optimization Level 1
    • Keil RTX5 variant 'Source'
Debug (eMRAM)
code: eMRAM
data: eMRAM
idle: eMRAM off
        SRAM off
        + sleepdeep

Configure the board's BOOT switch to "MRAM".

How it works:

  •   SRAM3 is used as 'ULP RAM' which means that it is active during power down phase.
  •   Code and Data for ulp_* files are placed in ULP RAM because code is used to enter and leave power down phase.
  •   Interrupt vecors are copied to ULP RAM because S32K Timer interrupt is used for wake up.
  •   Main stack is placed in ULP RAM.
  •   Process stack is placed in ULP RAM during pwer down phase.
  •   OS Idle Thread checks if system can enter power down phase.