Invoking the Bootloader

• Hardware.
  1. Turn OFF and ON the board with T2 pressed, blue LED glows indicating that the board switched to bootloader mode.
• Software
  1. Write 0x4E494F43 ('N','I','O','C') to MAGIC_LOCATION (0x2003FFF4)
  2. Write 0x0 or 0xF0000 to APP_START_ADDR (0x2003FFF8)
  3. Call NVIC_SystemReset()
  4. 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();
     

  5. 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