Invoking the Bootloader

APP3.0 Board

• Hardware

  • Turn OFF and ON the board with T2 pressed, blue LED glows indicating that the board switched to bootloader mode.

• Software

  • Write 0x4E494F43 ('N','I','O','C') to MAGIC_LOCATION (0x2003FFF4)

  • Write 0x0 or 0xF0000 to APP_START_ADDR (0x2003FFF8)

  • Call NVIC_SystemReset()

  • Invoke Bootloader from Software

  #define  MAGIC_LOCATION (0x2003FFF4)
  #define  APP_START_ADDR (*(uint32_t *)(MAGIC_LOCATION+4)
  
  *((uint32_t *)MAGIC_LOCATION) == 0x4E494F43;
  APP_START_ADDR = 0xF0000;
  //APP_START_ADDR = 0x0;
  NVIC_SystemReset(); 
  

  • The same feature can also be used to perform application switch ( 2 or more applications can reside in the same flash memory at different address locations ). Just write the application start address to APP_START_ADDR instead of bootloader address.

Nicla Sense ME Board

• Hardware

  • Press three times reset button, blue LED glows indicating that the board switched to bootloader mode.

• Software

  • Write 0x4E494F43 (’N’,’I’,’O’,’C’) to MAGIC_LOCATION (0x2000F804)

  • Call NVIC_SystemReset()

  • Invoke Bootloader from Software

  #define MAGIC_LOCATION (0x2000F804)
  #define APP_START_ADDR (*(uint32_t *)(MAGIC_LOCATION+4)
  *((uint32_t *)MAGIC_LOCATION) == 0x544F4F42;
  NVIC_SystemReset();
  

  • The same feature can also be used to perform application switch ( 2 or more applications can reside in the same flash memory at different address locations ).Just write the application start address to APP_START_ADDR instead of bootloader address.