The bootstrapper of BlueConnect needs to do some low power wait on startup to avoid current peaks. For the low power wait, the watchdog is used in a very early state.
The problem is, that the application is thus invoked always with watchdog set in RESETREAS
and thus the application set the "watchdog" flag.
To avoid this, the idea is to use an MCU register to track, if the watchdog bit was set by the low power wait or by other circumstances.
-
if
RESETREAS== 0 (power up!), then set R12 to 0x11223344 and make the low power wait with the watchdog (this ends the control flow below) -
else if R12 == 0x11223344, then clear the watchdog bit from
RESETREAS(because it was induced by the above watchdog wait) -
else leave
RESETREASas it is -
set R12 to 0
-
start application