IWDG (Watchdog) Enable on STM32

[Damiano Balzani]

Posted on February 02, 2018 at 09:21

Hi everybody,

i'm tryng to configure the IWDG but it doesn't work. i didn't find the enable bit, is there?

Can you help me?

I post my code here

void wdt_enable(void)

{

RCC -> CSR = RCC -> CSR | 0x00000001; //Enable LSI Clock

while((RCC -> CSR & 0x02)==0)

{

//add timeout code here

}

IWDG -> KR = 0x0000CCCC; //Enable IWDG

IWDG -> KR = 0x00005555; //Enable register access

IWDG -> PR = 0x010; //Set Prescaler /16

IWDG -> RLR = 0xFFF; //Set Reload Value for 2.048 seconds

while(IWDG -> SR) //Check if flags are reset

{

//add timeout code here

}

IWDG -> KR = 0x0000AAAA; //Refresh the counter

}

Thanks in advance

Damiano

#stm32-iwdg #iwdg

[henry.dick]

Posted on February 02, 2018 at 13:49

'

i didn't find the enable bit, is there?'

have you read the code you have written? it explicitly does so.

[waclawek.jan]

Posted on February 02, 2018 at 13:56

it doesn't work

How do you know?

i didn't find the enable bit

There is no enable bit - writing the key value CCCCh starts the watchdog

JW

[Damiano Balzani]

Posted on February 02, 2018 at 14:04

because i'm using a debugger and i'm seeing that the registers have not the value written in the code

do i miss something?

Thanks

DB

[henry.dick]

Posted on February 02, 2018 at 14:09

'because i'm using a debugger and i'm seeing that the registers have not the value written in the code'

that's a different question.

'do i miss something?'

read the datasheet, as it is designed to answer this sort of questions: it has a section specifically on that.