pcf8563.c

CVAVR的函数库的源代码。开发AVR的编译器CodeVision AVR最新版本2.53的函数库c语言源代码。函数短小精悍

/*
  CodeVisionAVR C Compiler
  (C) 1998-2004 Pavel Haiduc, HP InfoTech S.R.L.

  Philips PCF8563 I2C bus Real Time Clock functions
*/

#include <i2c.h>
#include <bcd.h>

unsigned char rtc_read(unsigned char address)
{
unsigned char d;
i2c_start();
i2c_write(0xa2);
i2c_write(address);
i2c_start();
i2c_write(0xa3);
d=i2c_read(0);
i2c_stop();
return d;
}

void rtc_write(unsigned char address,unsigned char data)
{
i2c_start();
i2c_write(0xa2);
i2c_write(address);
i2c_write(data);
i2c_stop();
}

void rtc_stop(void)
{
rtc_write(0,0x20);
}

void rtc_start(void)
{
rtc_write(0,0);
}

void rtc_init(unsigned char ctrl2,unsigned char clkout,unsigned char timer_ctrl)
{
rtc_write(1,ctrl2);
rtc_write(0xd,clkout);
rtc_write(0xe,timer_ctrl);
rtc_start();
}

unsigned char rtc_read_bcd(unsigned char addr,unsigned char mask)
{
return bcd2bin(rtc_read(addr) & mask);
}

void rtc_write_bcd(unsigned char addr,unsigned char data)
{
rtc_write(addr,bin2bcd(data));
}

unsigned char rtc_get_time(unsigned char *hour,unsigned char *min,unsigned char *sec)
{
unsigned char d;
d=rtc_read(2);
*sec=bcd2bin(d & 0x7f);
if (d & 0x80) d=0; else d=1;
*min=rtc_read_bcd(3,0x7f);
*hour=rtc_read_bcd(4,0x3f);
return d;
}

void rtc_set_time(unsigned char hour,unsigned char min,unsigned char sec)
{
rtc_stop();
rtc_write_bcd(2,sec);
rtc_write_bcd(3,min);
rtc_write_bcd(4,hour);
rtc_start();
}

void rtc_get_date(unsigned char *date,unsigned char *month,unsigned *year)
{
unsigned char mc;
unsigned y=1900;
*date=rtc_read_bcd(5,0x3f);
mc=rtc_read(7);
*month=bcd2bin(mc & 0x1f);
if (mc & 0x80) y=2000;
*year=rtc_read_bcd(8,0xff)+y;
}

void rtc_set_date(unsigned char date,unsigned char month,unsigned year)
{
unsigned char mc;
mc=bin2bcd(month);
if (year>=2000) mc|=0x80;
rtc_stop();
rtc_write_bcd(5,date);
rtc_write(7,mc);
rtc_write_bcd(8,year%100);
rtc_start();
}

void rtc_alarm_off(void)
{
rtc_write(9,rtc_read(9) | 0x80);
rtc_write(10,rtc_read(10) | 0x80);
rtc_write(11,rtc_read(11) | 0x80);
rtc_write(12,0x80);
}

void rtc_alarm_on(void)
{
unsigned char d;
rtc_write(9,rtc_read(9) & 0x7f);
rtc_write(10,rtc_read(10) & 0x3f);
d=rtc_read(11) & 0x3f;
if (d==0) d|=0x80;
rtc_write(11,d);
}

void rtc_write_alarm(unsigned char addr,unsigned char data)
{
rtc_write(addr,bin2bcd(data) | 0x80);
}

void rtc_set_alarm(unsigned char date,unsigned char hour,unsigned char min)
{
rtc_write_alarm(9,min);
rtc_write_alarm(10,hour);
rtc_write_alarm(11,date);
rtc_write(12,0x80);
}

void rtc_get_alarm(unsigned char *date,unsigned char *hour,unsigned char *min)
{
*min=rtc_read_bcd(9,0x7f);
*hour=rtc_read_bcd(10,0x3f);
*date=rtc_read_bcd(11,0x3f);
}

void rtc_set_timer(unsigned char val)
{
rtc_write(0xf,val);
}