rtc32.c File Reference

AVR XMEGA 32-bit Real Time Counter driver.

Copyright (c) 2010-2018 Microchip Technology Inc. and its subsidiaries.

#include <compiler.h>
#include <parts.h>
#include <sysclk.h>
#include <delay.h>
#include "rtc32.h"

Data Structures
struct	RTC32_struct2
struct	rtc_data_struct
	Driver private struct. More...

Macros
#define	RTC32   (*(RTC32_t2 *)0x0420)
#define	RTC32_CLOCK   VBAT_XOSCSEL_bm
#define	RTC32_COMPARE_INT_LEVEL   CONFIG_RTC32_COMPARE_INT_LEVEL

Typedefs
typedef struct RTC32_struct2	RTC32_t2

Functions
	ISR (RTC32_COMP_vect)
	Compare interrupt used for alarm. More...
bool	rtc_alarm_has_triggered (void)
	Check if pending alarm has triggered. More...
static uint32_t	rtc_get_counter (void)
	Get counter. More...
uint32_t	rtc_get_time (void)
	Get current time. More...
void	rtc_init (void)
	Initialize the 32kHz oscillator and RTC32. More...
static __always_inline bool	rtc_is_busy (void)
	Check if RTC32 is busy synchronizing. More...
void	rtc_set_alarm (uint32_t time)
	Set alarm time. More...
void	rtc_set_callback (rtc_callback_t callback)
	Set callback to call on alarm. More...
void	rtc_set_time (uint32_t time)
	Set current time. More...
enum vbat_status_code	rtc_vbat_system_check (bool first_time_startup)
	Checks battery backup system status. More...
static void	vbat_init (void)
	Initialize VBAT and start 32kHz oscillator. More...

Variables
struct rtc_data_struct	rtc_data
	Driver private data. More...

#define RTC32   (*(RTC32_t2 *)0x0420)

Workaround for missing CNT, PER and COMP in WinAVR header files

Todo:

Remove when header files are fixed if WinAVR release

Referenced by ISR(), rtc_alarm_has_triggered(), rtc_get_counter(), rtc_init(), rtc_is_busy(), rtc_set_alarm(), and rtc_set_time().

#define RTC32_CLOCK   VBAT_XOSCSEL_bm

Referenced by vbat_init().

#define RTC32_COMPARE_INT_LEVEL   CONFIG_RTC32_COMPARE_INT_LEVEL

Referenced by rtc_alarm_has_triggered(), and rtc_set_alarm().

typedef struct RTC32_struct2 RTC32_t2

Workaround for missing CNT, PER and COMP in WinAVR header files

Todo:

Remove when header files are fixed if WinAVR release

ISR

(

RTC32_COMP_vect

)

Compare interrupt used for alarm.

Disables the RTC32 interrupts, then calls the alarm callback function if one has been set.

References rtc_data_struct::callback, RTC32, rtc_data, and rtc_get_time().

static uint32_t rtc_get_counter ( void  )

inlinestatic

Get counter.

Returns

Counter value

References RTC32.

Referenced by rtc_get_time().

static __always_inline bool rtc_is_busy ( void  )

static

Check if RTC32 is busy synchronizing.

Return values

true	Is busy
false	Is ready

References RTC32.

Referenced by rtc_init(), and rtc_set_time().

static void vbat_init ( void  )

static

Initialize VBAT and start 32kHz oscillator.

Enables access to the VBAT system, performs a reset, enables the failure detection, and starts the oscillator.

The default clock rate to the RTC32 is 1Hz but this can be changed to 1024Hz by the user in the module configuration by defining CONFIG_RTC32_CLOCK_1024HZ.

References ccp_write_io(), delay_us, and RTC32_CLOCK.

Referenced by rtc_init().

struct rtc_data_struct rtc_data

Driver private data.

Referenced by ISR(), rtc_get_time(), rtc_set_alarm(), rtc_set_callback(), and rtc_set_time().