rtc.c File Reference

#include <avr/io.h>
#include <avr/pgmspace.h>
#include <stdio.h>
#include <inttypes.h>
#include "util.h"
#include "rtc.h"

Include dependency graph for rtc.c:

Functions
void	rtc_init ()
void	rtc_send (uint8_t b)
void	rtc_over ()
uint8_t	rtc_rw (uint8_t addr, int8_t value)
uint16_t	rtc_gettime ()
void	rtc_dump ()

---

Function Documentation

void rtc_dump

(

)

                {
    uint8_t i;
    
    rtc_send(0); 
    for (i = 0; i < 0x1a; i++) {
        rtc_send(0); 
        printf_P(PSTR("%02x:%02x   "), i, SPDR);
    }
    rtc_over();
}

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uint16_t rtc_gettime

(

)

                       {
    uint16_t time = 0;

    // address 0    
    rtc_send(1);

    // data 1
    rtc_send(0);
    time = SPDR; 
    
    // data 2
    rtc_send(0);
    while (!(SPSR & _BV(SPIF)));
    time |= SPDR<<8;
    
    rtc_over();
          
    return time; 
}

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void rtc_init

(

)

                {
    DDRD |= _BV(6);     // RTCSEL#
    
    DDRB |= BV2(5,7);
    DDRB &= ~_BV(6);
    
    PORTD |= _BV(6);
    
    SPCR = BV4(SPE, MSTR, CPHA, SPR1);
}

void rtc_over

(

)

                {
    PORTD |= _BV(6);
}

uint8_t rtc_rw	(	uint8_t	addr,
		int8_t	value
	)

                                           {
    rtc_send(addr | (value == -1 ? 0 : 0200));
    rtc_send(value);
    rtc_over();
    return SPDR;
}

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void rtc_send

(

uint8_t

b

)

                         {
    PORTD &= ~_BV(6);
    SPDR = b;
    spi_wait();
}