mwf_periph_wwdt - WWDT

mwf_periph_wwdt - WWDT

the_wwdt, a peripheral object that summarizes the procedures for using the watchdog timer, is implemented.

With TWENET, this is used implicitly, so no initialization is required in the user’s program.

Code example

void setup_func() {
	mwf::gobal_init_wwdt_manager();
    the_wwdt.init(); // timeout in 4000ms approx.
}

// in some function called periodically (e.g. invoked by SysTick Timer.)
void do_every_tick() {
    the_wwdt.refresh();
}

class mwf::periph::wwdt

global_init_wwdt_manager(), global_deinit_wwdt_manager()

static void global_init_wwdt_manager();
static void global_deinit_wwdt_manager();

These functions create and destroy the the_wwdt class object.

init(), deinit()

void init(uint32_t u32ms = 0);
void deinit();

These functions initialize and stop the watchdog timer (*1).

• The u32ms parameter during initialization specifies the timeout in milliseconds (ms). If it is 0 or omitted, the timeout will be 4000ms.
• *1 Due to hardware limitations, a watchdog timer that has been started once cannot be stopped. deinit() is provided as a library procedure (e.g., when restarting the timer, you would execute deinit() and then call init() again).

set_timeout()

void set_timeout(uint32_t u32ms);

This function changes the watchdog timer’s timeout duration. For u32ms, specify the timeout duration in milliseconds (ms).

• The validity of u32ms is not validated. While init() used 0 as a default value, the behavior of this function when 0 is provided is undefined.

refresh()

void refresh();

This is the refresh function that must be called before the watchdog timer’s timeout.

class mwf::periph::wwdt (sys_ev_handler)

on_sleep()

Performs the WWDT stop procedure.

on_wakeup()

Performs the WWDT start procedure.

• If it was active before sleep, the WWDT is reactivated.