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M5Unified RTC8563 Class

begin

Syntax:

bool begin(I2C_Class* i2c = nullptr);

Description:

  • Initialize RTC

Parameters:

  • I2C_Class* i2c:
    • Pointer to the I2C bus instance

Return:

  • bool:
    • true: Initialization successful
    • false: Initialization failed

getVoltLow

Syntax:

bool getVoltLow(void);

Description:

  • Check the status of the RTC power failure detector

Parameters:

  • null

Return:

  • bool:
    • true: No power failure
    • false: Power failure occurred

getTime

Syntax:

bool getTime(rtc_time_t* time) const;

Description:

  • Get the current time

Parameters:

  • rtc_time_t* time:
    • Pointer to the structure that receives the time information

Return:

  • bool:
    • true: Read successful
    • false: Read failed

Syntax:

rtc_time_t getTime(void) const

Description:

  • Get the current time

Parameters:

  • null

Return:

  • rtc_time_t time: Time information structure
cpp
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struct __attribute__((packed)) rtc_time_t
{
std::int8_t hours;
std::int8_t minutes;
std::int8_t seconds;
rtc_time_t(std::int8_t hours_ = -1, std::int8_t minutes_ = -1, std::int8_t seconds_ = -1)
: hours { hours_ }
, minutes { minutes_ }
, seconds { seconds_ }
{}
rtc_time_t(const tm& t)
: hours { (int8_t)t.tm_hour }
, minutes { (int8_t)t.tm_min }
, seconds { (int8_t)t.tm_sec }
{}
};

getDate

Syntax:

bool getDate(rtc_date_t* date) const;

Description:

  • Get the current date

Parameters:

  • rtc_date_t* date:
    • Pointer to the structure that receives the date information

Return:

  • bool:
    • true: Read successful
    • false: Read failed

Syntax:

rtc_date_t getDate(void) const;

Description:

  • Get the current date

Parameters:

  • null

Return:

  • rtc_date_t date: Date information structure
cpp
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struct __attribute__((packed)) rtc_date_t
{
/// year 1900-2099
std::int16_t year;
/// month 1-12
std::int8_t month;
/// date 1-31
std::int8_t date;
/// weekDay 0:sun / 1:mon / 2:tue / 3:wed / 4:thu / 5:fri / 6:sat
std::int8_t weekDay;
rtc_date_t(std::int16_t year_ = 2000, std::int8_t month_ = 1, std::int8_t date_ = -1, std::int8_t weekDay_ = -1)
: year { year_ }
, month { month_ }
, date { date_ }
, weekDay { weekDay_ }
{}
rtc_date_t(const tm& t)
: year { (int16_t)(t.tm_year + 1900) }
, month { (int8_t )(t.tm_mon + 1 ) }
, date { (int8_t ) t.tm_mday }
, weekDay { (int8_t ) t.tm_wday }
{}
};

getDateTime

Syntax:

bool getDateTime(rtc_datetime_t* datetime) const;

Description:

  • Get the current time and date

Parameters:

  • rtc_datetime_t* datetime:
    • Pointer to the structure that receives the time and date information

Return:

  • bool:
    • true: Read successful
    • false: Read failed

Syntax:

cpp
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rtc_datetime_t getDateTime(void) const
{
rtc_datetime_t res;
getDateTime(&res);
return res;
}

Description:

  • Get the current time and date

Parameters:

  • null

Return:

  • rtc_datetime_t datetime: Time and date information structure
cpp
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struct __attribute__((packed)) rtc_datetime_t
{
rtc_date_t date;
rtc_time_t time;
rtc_datetime_t() = default;
rtc_datetime_t(const rtc_date_t& d, const rtc_time_t& t) : date { d }, time { t } {};
rtc_datetime_t(const tm& t) : date { t }, time { t } {}
tm get_tm(void) const;
void set_tm(tm& time);
void set_tm(tm* t) { if (t) set_tm(*t); }
};

setTime

Syntax:

void setTime(const rtc_time_t &time);

Description:

  • Set the RTC time

Parameters:

  • rtc_time_t* time:
    • Reference to the time information structure

Return:

  • null

Syntax:

void setTime(const rtc_time_t* const time);

Description:

  • Set the RTC time

Parameters:

  • rtc_time_t* time:
    • Pointer to the time information structure

Return:

  • null

setDate

Syntax:

void setDate(const rtc_date_t &date);

Description:

  • Set the RTC date

Parameters:

  • rtc_time_t* time:
    • Reference to the date information structure

Return:

  • null

Syntax:

void setDate(const rtc_date_t* const date);

Description:

  • Set the RTC date

Parameters:

  • rtc_time_t* time:
    • Pointer to the date information structure

Return:

  • null

setDateTime

Syntax:

void setDateTime(const rtc_datetime_t &datetime);

Description:

  • Set the RTC time and date

Parameters:

  • rtc_time_t* time:
    • Reference to the time and date information structure

Return:

  • null

Syntax:

void setDateTime(const rtc_datetime_t* const datetime);

Description:

  • Set the RTC time and date

Parameters:

  • rtc_time_t* time:
    • Pointer to the time and date information structure

Return:

  • null

Syntax:

void setDateTime(const tm* const datetime);

Description:

  • Initialize the RTC time and date using the standard C/C++ time structure

Parameters:

  • rtc_time_t* time:
    • Pointer to the standard time structure

Return:

  • null

setAlarmIRQ

Note: |IRQ implements timed interrupt signals, timed wake-up operations, etc. After triggering the signal, it is necessary to execute clearIRQ, disableIRQ to clear the interrupt flag, and then it can be set again.

Syntax:

int setAlarmIRQ(int afterSeconds);

Description:

  • Set timed interrupt signal, based on time information

Parameters:

  • int afterSeconds: the set number of seconds.
    • 1 - 15,300. If 256 or more, 1-minute cycle. (max 255 minutes.)

Return:

  • int(bool):
    • true: Set successfully
    • false: Set failed

Syntax:

int setAlarmIRQ(const rtc_time_t &time);

Description:

  • Set timed interrupt signal, based on time information

Parameters:

  • const rtc_time_t &time:
    • Reference to the time information structure

Return:

  • int(bool):
    • true: Set successfully
    • false: Set failed

Syntax:

int setAlarmIRQ(const rtc_date_t &date, const rtc_time_t &time);

Description:

  • Set timed interrupt signal, based on time, date information

Parameters:

  • const rtc_date_t &date:
    • Reference to the date information structure
  • const rtc_time_t &time:
    • Reference to the time information structure

Return:

  • int(bool):
    • true: Set successfully
    • false: Set failed

setSystemTimeFromRtc

Syntax:

void setSystemTimeFromRtc(struct timezone* tz = nullptr);

Description:

  • Initialize system time using RTC time information

Parameters:

  • struct timezone* tz:
    • Time zone offset information

Return:

  • null

getIRQstatus

Syntax:

bool getIRQstatus(void);

Description:

  • Get the status of the timed interrupt signal

Parameters:

  • null

Return:

  • bool:
    • true: Interrupt signal has been generated
    • false: Interrupt signal has not been generated

clearIRQ

Syntax:

void clearIRQ(void);

Description:

  • Clear the status of the timed interrupt signal

Parameters:

  • null

Return:

  • null

disableIRQ

Syntax:

void disableIRQ(void);

Description:

  • Disable the timer interrupt

Parameters:

  • null

Return:

  • null
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