### Get STM32RTC Instance

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

The STM32RTC library uses a singleton design pattern. Use this to get the single instance of the STM32RTC object.

```APIDOC
## Get STM32RTC Instance

### Description
Obtains the singleton instance of the STM32RTC object. This ensures that only one instance of the RTC is managed.

### Method
`STM32RTC& getInstance()`

### Endpoint
N/A (Class method)

### Parameters
None

### Request Example
```c++
STM32RTC& rtc = STM32RTC::getInstance();
```

### Response
Returns a reference to the single STM32RTC object.
```

--------------------------------

### Configure Second Alarm (Alarm B)

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

This example demonstrates how to attach an interrupt for Alarm B, set its day, time (including sub-seconds), and enable it with a specific match mode.

```C++
rtc.attachInterrupt(myCallback, &myCallbackdata, STM32RTC::ALARM_B);
    rtc.setAlarmDay(day, STM32RTC::ALARM_B);
    rtc.setAlarmTime(hours, minutes, seconds + 5, 567, STM32RTC::ALARM_B);
    rtc.enableAlarm(rtc.MATCH_DHHMMSS, STM32RTC::ALARM_B);
```

--------------------------------

### Get STM32RTC Instance

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Retrieve the singleton instance of the STM32RTC object. This ensures only one instance is active.

```C++
/* Get the rtc object */
STM32RTC& rtc = STM32RTC::getInstance();
```

--------------------------------

### Get Prescaler Values

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Retrieves the current asynchronous and synchronous prescaler values for the STM32 RTC.

```APIDOC
## Get Prescaler Values

### Description
Retrieves the current asynchronous (`predivA`) and synchronous (`predivS`) prescaler values set for the STM32 RTC. If not explicitly set, it returns the computed values for the current clock source.

### Method
`void getPrediv(uint32_t *predivA, uint32_t *predivS)`

### Endpoint
N/A (Class method)

### Parameters
* **predivA** (uint32_t *) - Output - Pointer to store the asynchronous prescaler value.
* **predivS** (uint32_t *) - Output - Pointer to store the synchronous prescaler value.

### Request Example
```c++
uint32_t predivA, predivS;
rtc.getPrediv(&predivA, &predivS);
// Now predivA and predivS hold the prescaler values
```

### Response
None. The values are written to the provided pointers.
```

--------------------------------

### Get Date

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Retrieves the complete date from the RTC, including day of the week, day, month, and year.

```APIDOC
## Get Date

### Description
Retrieves the complete current date from the RTC, including the day of the week, day of the month, month, and year.

### Method
`void getDate(uint8_t *weekDay, uint8_t *day, uint8_t *month, uint8_t *year)`

### Endpoint
N/A (Class method)

### Parameters
* **weekDay** (uint8_t *) - Output - Pointer to store the day of the week.
* **day** (uint8_t *) - Output - Pointer to store the day of the month.
* **month** (uint8_t *) - Output - Pointer to store the month.
* **year** (uint8_t *) - Output - Pointer to store the year.

### Request Example
```c++
uint8_t wd, d, mo, y;
rtc.getDate(&wd, &d, &mo, &y);
```

### Response
None. The date components are written to the provided pointers.
```

--------------------------------

### Get Clock Source

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Retrieves the current clock source used by the STM32 RTC.

```APIDOC
## Get Clock Source

### Description
Retrieves the current clock source configured for the STM32 RTC.

### Method
`Source_Clock getClockSource(void)`

### Endpoint
N/A (Class method)

### Parameters
None

### Request Example
```c++
Source_Clock currentSource = rtc.getClockSource();
```

### Response
Returns the current `Source_Clock` (e.g., `LSI_CLOCK`, `LSE_CLOCK`, `HSE_CLOCK`).
```

--------------------------------

### Get Week Day

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Retrieves the current day of the week from the RTC.

```APIDOC
## Get Week Day

### Description
Retrieves the current day of the week from the RTC.

### Method
`uint8_t getWeekDay(void)`

### Endpoint
N/A (Class method)

### Parameters
None

### Request Example
```c++
uint8_t dayOfWeek = rtc.getWeekDay();
```

### Response
Returns the day of the week as a `uint8_t` (typically 1-7).
```

--------------------------------

### Get SubSeconds

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Retrieves the sub-second value from the RTC.

```APIDOC
## Get SubSeconds

### Description
Retrieves the current sub-second value from the RTC.

### Method
`uint32_t getSubSeconds(void)`

### Endpoint
N/A (Class method)

### Parameters
None

### Request Example
```c++
uint32_t ss = rtc.getSubSeconds();
```

### Response
Returns the sub-second value as a `uint32_t`.
```

--------------------------------

### Get Hours (12-hour format)

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Retrieves the current hour, optionally including AM/PM information.

```APIDOC
## Get Hours (12-hour format)

### Description
Retrieves the current hour from the RTC. If the RTC is in 12-hour format, this function can also provide the AM/PM period.

### Method
`uint8_t getHours(AM_PM *period = nullptr)`

### Endpoint
N/A (Class method)

### Parameters
* **period** (AM_PM *) - Optional - A pointer to an `AM_PM` enum to store the period (AM or PM) if the RTC is in 12-hour format.

### Request Example
```c++
AM_PM currentPeriod;
uint8_t currentHour = rtc.getHours(&currentPeriod);
```

### Response
Returns the current hour (0-23 for 24-hour format, 1-12 for 12-hour format).
```

--------------------------------

### Get Time

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Retrieves the complete time from the RTC, including hours, minutes, seconds, sub-seconds, and optionally AM/PM.

```APIDOC
## Get Time

### Description
Retrieves the complete current time from the RTC, including hours, minutes, seconds, sub-seconds, and optionally the AM/PM period.

### Method
`void getTime(uint8_t *hours, uint8_t *minutes, uint8_t *seconds, uint32_t *subSeconds, AM_PM *period = nullptr)`

### Endpoint
N/A (Class method)

### Parameters
* **hours** (uint8_t *) - Output - Pointer to store the hour value.
* **minutes** (uint8_t *) - Output - Pointer to store the minute value.
* **seconds** (uint8_t *) - Output - Pointer to store the second value.
* **subSeconds** (uint32_t *) - Output - Pointer to store the sub-second value.
* **period** (AM_PM *) - Optional - Pointer to store the period (AM or PM) if the RTC is in 12-hour format.

### Request Example
```c++
uint8_t h, m, s;
uint32_t ss;
AM_PM p;
rtc.getTime(&h, &m, &s, &ss, &p);
```

### Response
None. The time components are written to the provided pointers.
```

--------------------------------

### Get Alarm Hours

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Retrieves the alarm hour, optionally including AM/PM information.

```APIDOC
## Get Alarm Hours

### Description
Retrieves the currently set alarm hour. If the RTC is in 12-hour format, this function can also provide the AM/PM period.

### Method
`uint8_t getAlarmHours(AM_PM *period)`

### Endpoint
N/A (Class method)

### Parameters
* **period** (AM_PM *) - Output - A pointer to an `AM_PM` enum to store the period (AM or PM) if the RTC is in 12-hour format.

### Request Example
```c++
AM_PM alarmPeriod;
uint8_t alarmHour = rtc.getAlarmHours(&alarmPeriod);
```

### Response
Returns the alarm hour (0-23 for 24-hour format, 1-12 for 12-hour format).
```

--------------------------------

### Get Epoch Time

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Retrieves the current time as a Unix epoch timestamp, optionally including sub-seconds.

```APIDOC
## Get Epoch Time

### Description
Retrieves the current time from the RTC as a Unix epoch timestamp (seconds since January 1, 1970). It can also optionally return the sub-second component.

### Method
`uint32_t getEpoch(uint32_t *subSeconds = nullptr)`

### Endpoint
N/A (Class method)

### Parameters
* **subSeconds** (uint32_t *) - Optional - A pointer to a `uint32_t` where the sub-second value will be stored if provided.

### Request Example
```c++
uint32_t ts;
uint32_t ss;
ts = rtc.getEpoch(&ss);
```

### Response
Returns the epoch timestamp as a `uint32_t`.
```

--------------------------------

### Set Date

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Sets the complete date, including day of the month, month, and year, along with the day of the week.

```APIDOC
## Set Date

### Description
Sets the complete date on the RTC, including the day of the week, day of the month, month, and year.

### Method
`void setDate(uint8_t weekDay, uint8_t day, uint8_t month, uint8_t year)`

### Endpoint
N/A (Class method)

### Parameters
* **weekDay** (uint8_t) - Required - The day of the week (typically 1-7).
* **day** (uint8_t) - Required - The day of the month (1-31).
* **month** (uint8_t) - Required - The month (1-12).
* **year** (uint8_t) - Required - The year (typically the last two digits, e.g., 23 for 2023).

### Request Example
```c++
// Set date to Wednesday, October 25, 2023
rtc.setDate(4, 25, 10, 23);
```

### Response
None
```

--------------------------------

### Set Time

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Sets the complete time, including hours, minutes, seconds, sub-seconds, and optionally AM/PM.

```APIDOC
## Set Time

### Description
Sets the complete time on the RTC, including hours, minutes, seconds, sub-seconds, and the AM/PM period if applicable.

### Method
`void setTime(uint8_t hours, uint8_t minutes, uint8_t seconds, uint32_t subSeconds = 1000, AM_PM period = AM)`

### Endpoint
N/A (Class method)

### Parameters
* **hours** (uint8_t) - Required - The hour value (1-12 for 12-hour format, 0-23 for 24-hour format).
* **minutes** (uint8_t) - Required - The minute value (0-59).
* **seconds** (uint8_t) - Required - The second value (0-59).
* **subSeconds** (uint32_t) - Optional - The sub-second value. Defaults to 1000.
* **period** (AM_PM) - Optional - The period (AM or PM), defaults to AM. Only applicable for 12-hour format.

### Request Example
```c++
// Set time to 3:30:15 PM with sub-seconds
rtc.setTime(3, 30, 15, 500, PM);
```

### Response
None
```

--------------------------------

### Initialize RTC with Hour Format

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Initializes the RTC and sets the desired hour format (12 or 24-hour). This function must be called before other configuration functions.

```APIDOC
## Initialize RTC with Hour Format

### Description
Initializes the STM32RTC with a specified hour format. This is a prerequisite for many other RTC operations.

### Method
`void begin(Hour_Format format)`

### Endpoint
N/A (Class method)

### Parameters
* **format** (Hour_Format) - Required - Specifies the hour format, either 12-hour or 24-hour.

### Request Example
```c++
// For 24-hour format
rtc.begin(FORMAT_24); 
// For 12-hour format
rtc.begin(FORMAT_12); 
```

### Response
None
```

--------------------------------

### Set Prescaler Values

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Sets the asynchronous and synchronous prescaler values for the STM32 RTC. This must be called before `begin()`.

```APIDOC
## Set Prescaler Values

### Description
Sets the asynchronous (`predivA`) and synchronous (`predivS`) prescaler values for the STM32 RTC. This function must be called before `begin()`.

### Method
`void setPrediv(uint32_t predivA, uint32_t predivS)`

### Endpoint
N/A (Class method)

### Parameters
* **predivA** (uint32_t) - Required - The asynchronous prescaler value. Use `(PREDIVA_MAX + 1)` to reset to computed values.
* **predivS** (uint32_t) - Required - The synchronous prescaler value. Use `(PREDIVS_MAX + 1)` to reset to computed values.

### Conditions
The prescaler values must satisfy: `1Hz = RTC CLK source / ((predivA + 1) * (predivS + 1))`

### Request Example
```c++
// Example: Setting prescalers for a specific frequency
rtc.setPrediv(127, 255);
```

### Response
None
```

--------------------------------

### Set Clock Source

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Sets the clock source and prescaler values for the STM32 RTC. This must be called before `begin()`.

```APIDOC
## Set Clock Source

### Description
Configures the clock source and prescaler values for the STM32 RTC. This function must be called before `begin()`.

### Method
`void setClockSource(Source_Clock source, uint32_t predivA, uint32_t predivS)`

### Endpoint
N/A (Class method)

### Parameters
* **source** (Source_Clock) - Required - The desired clock source (`LSI_CLOCK`, `LSE_CLOCK`, or `HSE_CLOCK`).
* **predivA** (uint32_t) - Required - The asynchronous prescaler value. Use `(PREDIVA_MAX + 1)` to reset to computed values.
* **predivS** (uint32_t) - Required - The synchronous prescaler value. Use `(PREDIVS_MAX + 1)` to reset to computed values.

### Conditions
The prescaler values must satisfy: `1Hz = RTC CLK source / ((predivA + 1) * (predivS + 1))`

### Request Example
```c++
// Example: Setting LSE clock with specific prescalers
rtc.setClockSource(LSE_CLOCK, 127, 255);
```

### Response
None
```

--------------------------------

### Binary and Mix Modes API

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

API for managing the RTC's operational modes (BCD, MIX, BIN).

```APIDOC
## Binary and Mix Modes API

### Description
API for managing the RTC's operational modes, allowing the use of a 32-bit free-running counter in addition to or instead of the BCD calendar mode. This is particularly useful for devices like the stm32wl55.

### Functions
- **`Binary_Mode getBinaryMode(void)`**: Retrieves the current binary mode of the RTC.
- **`void setBinaryMode(Binary_Mode mode)`**: Sets the RTC to the specified binary mode.

### Constants
- **`STM32RTC::MODE_BCD`**: Represents the Binary Coded Decimal mode.
- **`STM32RTC::MODE_MIX`**: Represents the Mixed mode (BCD and Binary counter).
- **`STM32RTC::MODE_BIN`**: Represents the pure Binary counter mode.

### Notes on SubSeconds Parameter
- The SubSecond parameter in MIX or BCD mode ranges from [0..999] milliseconds.
- In BIN mode, the SubSecond parameter ranges from [0..0xFFFFFFFF].
- When using BIN mode only, `getEpoch` returns the sub-second value [0..0xFFFFFFFF] (time_t is not valid), and `setAlarmEpoch` uses only the sub-second value (time_t is useless).
```

--------------------------------

### Set Hours (12-hour format)

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Sets the current hour, optionally specifying AM/PM.

```APIDOC
## Set Hours (12-hour format)

### Description
Sets the current hour for the RTC. If the RTC is configured for 12-hour format, the AM/PM period can also be specified.

### Method
`void setHours(uint8_t hours, AM_PM period = AM)`

### Endpoint
N/A (Class method)

### Parameters
* **hours** (uint8_t) - Required - The hour value to set (1-12 for 12-hour format, 0-23 for 24-hour format).
* **period** (AM_PM) - Optional - The period (AM or PM) to set, defaults to AM. Only applicable for 12-hour format.

### Request Example
```c++
// Set to 3 PM
rtc.setHours(3, PM);
// Set to 15 (in 24-hour format)
rtc.setHours(15);
```

### Response
None
```

--------------------------------

### Set Alarm Time

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Sets the complete alarm time, including hours, minutes, seconds, and optionally AM/PM.

```APIDOC
## Set Alarm Time

### Description
Sets the complete time for an RTC alarm, including hours, minutes, and seconds. The AM/PM period can also be specified.

### Method
`void setAlarmTime(uint8_t hours, uint8_t minutes, uint8_t seconds, AM_PM period)`

### Endpoint
N/A (Class method)

### Parameters
* **hours** (uint8_t) - Required - The hour value for the alarm (1-12 for 12-hour format, 0-23 for 24-hour format).
* **minutes** (uint8_t) - Required - The minute value for the alarm (0-59).
* **seconds** (uint8_t) - Required - The second value for the alarm (0-59).
* **period** (AM_PM) - Required - The period (AM or PM) for the alarm. Only applicable for 12-hour format.

### Request Example
```c++
// Set alarm for 10:45:30 PM
rtc.setAlarmTime(10, 45, 30, PM);
```

### Response
None
```

--------------------------------

### Set Alarm Epoch

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Sets an alarm using a Unix epoch timestamp and match criteria, optionally including sub-seconds.

```APIDOC
## Set Alarm Epoch

### Description
Sets an RTC alarm using a Unix epoch timestamp and specifies the match criteria. Sub-seconds can also be included.

### Method
`void setAlarmEpoch(uint32_t ts, Alarm_Match match = MATCH_DHHMMSS, uint32_t subSeconds = 0)`

### Endpoint
N/A (Class method)

### Parameters
* **ts** (uint32_t) - Required - The epoch timestamp for the alarm.
* **match** (Alarm_Match) - Optional - The alarm match criteria (e.g., `MATCH_DHHMMSS`). Defaults to `MATCH_DHHMMSS`.
* **subSeconds** (uint32_t) - Optional - The sub-second value for the alarm. Defaults to 0.

### Request Example
```c++
// Set alarm for a specific epoch time, matching day, hour, minute, second
rtc.setAlarmEpoch(1678886400, MATCH_DHHMMSS, 200);
```

### Response
None
```

--------------------------------

### Set Alarm Time (with SubSeconds)

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Sets the complete alarm time, including hours, minutes, seconds, and sub-seconds. Defaults subSeconds to 0.

```APIDOC
## Set Alarm Time (with SubSeconds)

### Description
Sets the complete time for an RTC alarm, including hours, minutes, seconds, and sub-seconds. This is an updated version that supports sub-second precision.

### Method
`void setAlarmTime(uint8_t hours, uint8_t minutes, uint8_t seconds, uint32_t subSeconds = 0, AM_PM period = AM)`

### Endpoint
N/A (Class method)

### Parameters
* **hours** (uint8_t) - Required - The hour value for the alarm (1-12 for 12-hour format, 0-23 for 24-hour format).
* **minutes** (uint8_t) - Required - The minute value for the alarm (0-59).
* **seconds** (uint8_t) - Required - The second value for the alarm (0-59).
* **subSeconds** (uint32_t) - Optional - The sub-second value for the alarm. Defaults to 0.
* **period** (AM_PM) - Optional - The period (AM or PM) for the alarm, defaults to AM. Only applicable for 12-hour format.

### Request Example
```c++
// Set alarm for 11:00:00 AM with sub-seconds
rtc.setAlarmTime(11, 0, 0, 750, AM);
```

### Response
None
```

--------------------------------

### Second Alarm (Alarm B) API

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

API for configuring and managing the second alarm (Alarm B).

```APIDOC
## Second Alarm (Alarm B) API

### Description
API for configuring and managing the second alarm (Alarm B), which is available on some STM32 RTC devices. This allows for more granular alarm settings.

### Functions
- **`void attachInterrupt(voidFuncPtr callback, void *data, uint8_t alarmType)`**: Attaches an interrupt callback for a specified alarm type (ALARM_A or ALARM_B).
- **`void setAlarmDay(uint8_t day, uint8_t alarmType)`**: Sets the day for a specific alarm type.
- **`void setAlarmTime(uint8_t hours, uint8_t minutes, uint8_t seconds, uint16_t subSeconds, uint8_t alarmType)`**: Sets the time for a specific alarm type, including sub-second precision.
- **`void enableAlarm(uint8_t matchMode, uint8_t alarmType)`**: Enables a specific alarm type with a defined matching mode.

### Constants
- **`STM32RTC::ALARM_A`**: Constant for Alarm A.
- **`STM32RTC::ALARM_B`**: Constant for Alarm B.

### Example
```C++
rrtc.attachInterrupt(myCallback, &myCallbackdata, STM32RTC::ALARM_B);
rrtc.setAlarmDay(day, STM32RTC::ALARM_B);
rrtc.setAlarmTime(hours, minutes, seconds + 5, 567, STM32RTC::ALARM_B);
rrtc.enableAlarm(rtc.MATCH_DHHMMSS, STM32RTC::ALARM_B);
```
```

--------------------------------

### Set Alarm Time with Sub-Seconds

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Set the alarm time including hours, minutes, seconds, and sub-seconds. Note that sub-second support may vary by STM32 series.

```C++
#if defined(STM32_RTC_VERSION) && (STM32_RTC_VERSION  >= 0x01010000)
  rtc.setAlarmTime(alarmHours, alarmMinutes, alarmSeconds, 123);
#else
  rtc.setAlarmTime(alarmHours, alarmMinutes, alarmSeconds);
#endif
```

--------------------------------

### Set Alarm Hours

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Sets the alarm hour, optionally specifying AM/PM.

```APIDOC
## Set Alarm Hours

### Description
Sets the hour for an RTC alarm. If the RTC is configured for 12-hour format, the AM/PM period can also be specified.

### Method
`void setAlarmHours(uint8_t hours, AM_PM period = AM)`

### Endpoint
N/A (Class method)

### Parameters
* **hours** (uint8_t) - Required - The hour value to set for the alarm (1-12 for 12-hour format, 0-23 for 24-hour format).
* **period** (AM_PM) - Optional - The period (AM or PM) to set, defaults to AM. Only applicable for 12-hour format.

### Request Example
```c++
// Set alarm for 7 AM
rtc.setAlarmHours(7, AM);
```

### Response
None
```

--------------------------------

### Set Epoch Time

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Sets the RTC time using a Unix epoch timestamp, optionally including sub-seconds.

```APIDOC
## Set Epoch Time

### Description
Sets the RTC time using a Unix epoch timestamp (seconds since January 1, 1970). It can also optionally set the sub-second component.

### Method
`void setEpoch(uint32_t ts, uint32_t subSeconds = 0)`

### Endpoint
N/A (Class method)

### Parameters
* **ts** (uint32_t) - Required - The epoch timestamp in seconds.
* **subSeconds** (uint32_t) - Optional - The sub-second value to set. Defaults to 0.

### Request Example
```c++
// Set time to a specific epoch timestamp with sub-seconds
rtc.setEpoch(1678886400, 500);
```

### Response
None
```

--------------------------------

### SubSeconds Underflow Interrupt API

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Functions to attach and detach a callback for SubSeconds register underflow interrupts (STM32WLxx only).

```APIDOC
## SubSeconds Underflow Interrupt API

### Description
Functions to manage interrupts triggered when the SubSeconds register underflows. This feature is specific to STM32WLxx devices and is used by STM32LoRaWAN.

### Functions
- **`void attachSubSecondsUnderflowInterrupt(voidFuncPtr callback)`**: Attaches a callback function for the SubSeconds underflow interrupt.
- **`void detachSubSecondsUnderflowInterrupt(void)`**: Detaches the previously attached SubSeconds underflow interrupt callback.
```

--------------------------------

### Set SubSeconds

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Sets the sub-second value for the RTC.

```APIDOC
## Set SubSeconds

### Description
Sets the sub-second value for the RTC.

### Method
`void setSubSeconds(uint32_t subSeconds)`

### Endpoint
N/A (Class method)

### Parameters
* **subSeconds** (uint32_t) - Required - The sub-second value to set.

### Request Example
```c++
rtc.setSubSeconds(500);
```

### Response
None
```

--------------------------------

### One-Second Interrupt API

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Functions to attach and detach a callback for one-second interrupts.

```APIDOC
## One-Second Interrupt API

### Description
Functions to attach and detach a callback for one-second interrupts.

### Functions
- **`void attachSecondsInterrupt(voidFuncPtr callback)`**: Attaches a callback function to be executed every second.
- **`void detachSecondsInterrupt(void)`**: Detaches the previously attached one-second interrupt callback.
```

--------------------------------

### IsFormat_24Hour API

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Function to check the current hour format setting.

```APIDOC
## IsFormat_24Hour API

### Description
Checks if the RTC is currently configured to use the 24-hour format.

### Function
- **`bool isFormat24Hour(void)`**: Returns true if the hour format is 24-hour, false if it is 12-hour.
```

--------------------------------

### Check if Time is Set

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Use this snippet to determine if the RTC time has been previously set. If not, it proceeds to set the time.

```C++
if (!rtc.isTimeSet()) {
    // Set the time
    rtc.setHours(hours);
    rtc.setMinutes(minutes);
    rtc.setSeconds(seconds);
  }
```

--------------------------------

### Set Week Day

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Sets the current day of the week for the RTC.

```APIDOC
## Set Week Day

### Description
Sets the current day of the week for the RTC.

### Method
`void setWeekDay(uint8_t weekDay)`

### Endpoint
N/A (Class method)

### Parameters
* **weekDay** (uint8_t) - Required - The day of the week to set (typically 1-7).

### Request Example
```c++
// Set to Wednesday (assuming Wednesday is represented by 4)
rtc.setWeekDay(4);
```

### Response
None
```

--------------------------------

### Reset Time Management API

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Functions to manage RTC time setting and check if time has been set.

```APIDOC
## Reset Time Management API

### Description
Functions to manage RTC time setting and check if time has been set. By default, time is not reset after a reboot. Using `begin(true)` or `begin(true, HOUR_24)` will reset RTC registers.

### Functions
- **`bool isTimeSet(void)`**: Returns true if the time has been set, false otherwise.

### Example
```C++
if (!rtc.isTimeSet()) {
  // Set the time
  rtc.setHours(hours);
  rtc.setMinutes(minutes);
  rtc.setSeconds(seconds);
}
```
```

--------------------------------

### RTC Handle API

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Function to retrieve the RTC handle.

```APIDOC
## RTC Handle API

### Description
Function to retrieve the underlying RTC hardware handle, which can be useful for advanced configurations or direct register access.

### Function
- **`RTC_HandleTypeDef *RTC_GetHandle(void)`**: Returns a pointer to the `RTC_HandleTypeDef` structure.
```

--------------------------------

### Set Alarm SubSeconds

Source: https://github.com/stm32duino/stm32rtc/blob/main/README.md

Sets the sub-second value for an RTC alarm. Note: Not supported on STM32F1 and STM32L1xx (ULPM) series.

```APIDOC
## Set Alarm SubSeconds

### Description
Sets the sub-second value for an RTC alarm. This feature's availability depends on the STM32 series.

### Important Note
- STM32F1 and STM32L1xx (Ultra Low Power Medium density) series do not support sub-second alarms.
- The resolution of sub-seconds depends on the synchronous prescaler value.

### Method
`void setAlarmSubSeconds(uint32_t subSeconds)`

### Endpoint
N/A (Class method)

### Parameters
* **subSeconds** (uint32_t) - Required - The sub-second value to set for the alarm.

### Request Example
```c++
// Set alarm to trigger with sub-seconds precision
rtc.setAlarmSubSeconds(123);
```

### Response
None
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.