Common RTC helper functions. More...

Detailed Description

Common RTC helper functions.

Functions
void	rtc_tm_normalize (struct tm *time)
	Normalize the time struct.

int	rtc_tm_compare (const struct tm a, const struct tm b)
	Compare two time structs.

uint32_t	rtc_mktime (const struct tm *t)
	Convert time struct into timestamp.

void	rtc_localtime (uint32_t time, struct tm *t)
	Converts an RTC timestamp into a time struct.

bool	rtc_tm_valid (const struct tm *t)
	Verify that a time struct `t` contains valid data.

Function Documentation

Converts an RTC timestamp into a time struct.

Parameters

[in]	time	elapsed seconds since `RIOT_EPOCH`
[out]	t	the corresponding timestamp

uint32_t rtc_mktime ( const struct tm * t )

Convert time struct into timestamp.

Precondition: The time struct t is assumed to be normalized. Use rtc_tm_normalize to normalize a struct tm that has been manually edited.

Parameters

[in] t The time struct to convert

Compare two time structs.

Precondition: The time structs a and b are assumed to be normalized. Use rtc_tm_normalize to normalize a struct tm that has been manually edited.

Parameters

[in]	a	The first time struct.
[in]	b	The second time struct.

Returns: an integer < 0 if a is earlier than b; an integer > 0 if a is later than b; 0 if a and b are equal

void rtc_tm_normalize ( struct tm * time )

Normalize the time struct.

Note: The function modifies the fields of the tm structure as follows: If structure members are outside their valid interval, they will be normalized. So that, for example, 40 October is changed into 9 November.

If RTC_NORMALIZE_COMPAT is 1 tm_wday and tm_yday are set to values determined from the contents of the other fields.

Parameters

time	Pointer to the struct to normalize.

bool rtc_tm_valid ( const struct tm * t )

Verify that a time struct t contains valid data.

Note: This function checks whether the fields of the struct t are positive and within the bounds set by rtc_tm_normalize.

Parameters

[in] t The struct to be checked.