Posted on September 27, 2017 at 09:43Hi,
I came across IWDG function from Reference Document,
but I can't understand the difference between A15.1 and A15.2.
Would you please help me to understand it ?
what kind situation which example do I need it?
A.15 IWDG(Independent watchdog
) code example
A.15.1 IWDG configuration code example
/* (1) Activate IWDG (not needed if done in option bytes) */
/* (2) Enable write access to IWDG registers */
/* (3) Set prescaler by 8 */
/* (4) Set reload value to have a rollover each 100ms */
/* (5) Check if flags are reset */
/* (6) Refresh counter */
IWDG->KR = IWDG_START;
/* (1) */
IWDG->KR = IWDG_WRITE_ACCESS;
/* (2) */
IWDG->PR = IWDG_PR_PR_0;
/* (3) */
IWDG->RLR = IWDG_RELOAD;
/* (4) */
while
(IWDG->SR)
/* (5) */
{
/* add time out here for a robust application */
}
IWDG->KR = IWDG_REFRESH;
/* (6) */
A.15.2 IWDG configuration with window code example
/* (1) Activate IWDG (not needed if done in option bytes) */
/* (2) Enable write access to IWDG registers */
/* (3) Set prescaler by 8 */
/* (4) Set reload value to have a rollover each 100ms */
/* (5) Check if flags are reset */
/* (6) Set a 50ms window, this will refresh the IWDG */
IWDG->KR = IWDG_START;
/* (1) */
IWDG->KR = IWDG_WRITE_ACCESS;
/* (2) */
IWDG->PR = IWDG_PR_PR_0;
/* (3) */
IWDG->RLR = IWDG_RELOAD;
/* (4) */
while
(IWDG->SR)
/* (5) */
{
/* add time out here for a robust application */
}
IWDG->WINR = IWDG_RELOAD >> 1;
/* (6) */
