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#ifndef CLOCK_H
#define CLOCK_H
/* this dcf77-module relies on a accuarate clock (crystal) for receiving
* the dcf-signal. therefor the clock is going to work as expected,
* even with no dcf77-signal available.
* receivement is automatically turned on, if the avr is connected to the
* signal via INT0. if there is no signal the clock will not be set (K.I.S.S.)
*
*/
#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdint.h>
#define INT0_CONTROL MCUCR
// #define INT0_FALLING_EDGE 0x02
// #define INT0_RISING_EDGE 0x03
#define INT0_FALLING_EDGE (1<<ISC01)
#define INT0_RISING_EDGE (1<<ISC01 | 1<<ISC00)
#define INT0_EDGE_ANY (1<<ISC00)
typedef struct
{
volatile unsigned char bit : 1;
} Bit;
typedef struct
{
uint16_t h ; // hour
uint16_t m ; // minute
uint16_t s ; // second
uint16_t ms; // milli second
uint8_t yy; // year
uint8_t mm; // month
uint8_t dd; // day
uint8_t wd; // weekday
} Time;
typedef enum
{
DCF_FIRST = 0, // start of a new minute (note: always 0)
DCF_WEATHER = 14, // proprietary :-(
DCF_ANTENNA = 15, // 0: normal, 1: replacement
DCF_DST = 16, // daylight saving time: this hour new time...
DCF_MEZ = 17, // 'summer-time'
DCF_MESZ = 18, // 'winter-time'
DCF_DBLSEC = 19, // one extra second gonna be inserted
DCF_START = 20, // begin of time-info (note: always 1)
DCF_MIN = 21, // 7 bit
DCF_MINP = 28, // parity bit for minutes
DCF_HOUR = 29, // 6 bit
DCF_HOURP = 35, // parity bit for hours
DCF_DAY = 36, // 6 bit
DCF_WEEKDAY = 42, // 3 bit
DCF_MONTH = 45, // 5 bit
DCF_YEAR = 50, // 8 bit
DCF_DATEP = 58 // parity bit for date
} DCF;
volatile Bit dcf77[60];
volatile uint8_t dcf77_bit;
volatile Time t_current;
volatile uint16_t interval;
/// void getBits(volatile unsigned char* target, const DCF start, const char len, const DCF parity);
/// void set_dcf_value();
/// void interrupts_init();
#endif
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