How is the software reset implemented (Boron and Electron)

NickOveracker · September 3, 2019, 10:05pm

I’m trying to track down the System.reset() function implementation in Github, but I haven’t had much luck. Github’s search functionality leaves much to be desired, I’m afraid!

Can someone point me to the correct file?

ScruffR · September 4, 2019, 7:56am

System.reset() just triggers the system reset interrupt (NVIC_SystemReset())

for the ST32F2 based Gen2 devices this would be something like this

github.com

particle-iot/device-os/blob/1b1805fb4afcb93b0e92fbecfd28c082d6310285/hal/src/photon/wiced/platform/ARM_CM4/CMSIS/core_cm4.h#L1640




  *pPreemptPriority = (Priority >> SubPriorityBits) & (((uint32_t)1 << (PreemptPriorityBits)) - 1);

  *pSubPriority     = (Priority                   ) & (((uint32_t)1 << (SubPriorityBits    )) - 1);

}





/** \brief  System Reset



    The function initiates a system reset request to reset the MCU.

 */

__STATIC_INLINE void NVIC_SystemReset(void)

{

  __DSB();                                                     /* Ensure all outstanding memory accesses included

                                                                  buffered write are completed before reset */

  SCB->AIRCR  = ((0x5FA << SCB_AIRCR_VECTKEY_Pos)      |

                 (SCB->AIRCR & SCB_AIRCR_PRIGROUP_Msk) |

                 SCB_AIRCR_SYSRESETREQ_Msk);                   /* Keep priority group unchanged */

  __DSB();                                                     /* Ensure completion of memory access */

  while(1);                                                    /* wait until reset */

}

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How is the software reset implemented (Boron and Electron)

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