Posted on June 28, 2018 at 10:44Hi everyone, I am trying to enable IWDG timer and working for me. but i am not able to change the iwdg timeout, it always ~8ms. I am using HSI CLOCK(16MHz) and referring the Example code provided by ST .
I think the maximum iwdg timeout is 1 sec for STM8S003. Am I right??
here is my source code. I am configuring 250ms IWDG timeout. but getting IWDG timeout is < 8ms. please help me to figure out the issue.
LsiFreq=128000; //128khz
void main(void)
{
/* Configures clocks */
clock_configuration();
IWDG_Config();
while(1)
{
/* Reload IWDG counter */
IWDG_ReloadCounter();
}
}
void IWDG_Config(void)
{
/* IWDG timeout equal to 250 ms (the timeout may varies due to LSI frequency
dispersion) */
/* Enable write access to IWDG_PR and IWDG_RLR registers */
IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
/* IWDG counter clock: LSI/128 */
IWDG_SetPrescaler(IWDG_Prescaler_128;
/* Set counter reload value to obtain 250ms IWDG TimeOut.
Counter Reload Value = 250ms/IWDG counter clock period
= 250ms / (LSI/128)
= 0.25s / (LsiFreq/128)
= LsiFreq/(128 * 4)
= LsiFreq/512
*/
IWDG_SetReload((uint8_t)(LsiFreq/512));
/* Reload IWDG counter */
IWDG_ReloadCounter();
/* Enable IWDG (the LSI oscillator will be enabled by hardware) */
IWDG_Enable();
}
