Watchdog for STM32f20xx

[k7gkc]

Hello There,
I am studying to use modm in one of our projects. I wanted to implement a watchdog on the stm32f2xx controller. But there are no sources for the watchdog. Does anyone has a suggestion or already an implementation?

[rleh]

STM32F2 has two watchdog peripherals, IWDG and WWGD.
There is no watchdog driver in modm for any controller, if you like you are welcome to contribute one.

Otherwise you could just access the peripheral using the defines from ST header, e.g. for the IWDG (untested code):

// Enable power/clock to the IWDG peripheral
modm::platform::Rcc::enable<Peripheral::Iwdg>();

// enable access to the IWDG_PR and IWDG_RLR registers
IWDG->KR = 0x5555;

IWDG->PR = (0b010 << IWDG_PR_PR_Pos); // divider /16
IWDG->RLR = (0xFFF << IWDG_RLR_RL_Pos); // reload value: 0xfff==4095

// starts the watchdog
IWDG->KR = 0xCCCC;

// ...

while(1) {
  // ...
  IWDG->KR = 0xAAAA;
  // ...
}

[k7gkc]

This will help, thank you!

[victorandrehc]

Hey, a associate of mine developed this as a basic watchdog support for modm
#1009