//////////////////////////////////////////////////////////////////////////
//// DS1302.C ////
//// Driver for Real Time Clock ////
//// ////
//// rtc_init() Call after power up////
//// ////
//// rtc_set_datetime(day,mth,year,dow,hour,min) Set the date/time ////
//// ////
//// rtc_get_date(day,mth,year,dow) Get the date ////
//// ////
//// rtc_get_time(hr,min,sec) Get the time ////
//// ////
//// rtc_write_nvr(address,data) Write to NVR ////
//// ////
//// data = rtc_read_nvr(address) Read from NVR ////
//// ////
//// get_bcd(data) Convert data to BCD ////
//// ////
//// rm_bcd(data) Convert data to int ////
//// ////
//////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,2003 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS C ////
//// compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, reproduction////
//// or distribution is permitted without written permission. ////
//// Derivative programs created using this software in object code ////
//// form are not restricted in any way. ////
//////////////////////////////////////////////////////////////////////////
#ifndef RTC_SCLK
#define RTC_SCLK PIN_C3
#define RTC_IO PIN_C4
#define RTC_RST PIN_C2
#endif
void write_ds1302_byte(BYTE cmd) {
BYTE i;
for(i=0;i<=7;++i) {
output_bit(RTC_IO, shift_right(&cmd,1,0) );
output_high(RTC_SCLK);
output_low(RTC_SCLK);
}
}
void write_ds1302(BYTE cmd, BYTE data) {
output_high(RTC_RST);
write_ds1302_byte(cmd);
write_ds1302_byte(data);
output_low(RTC_RST);
}
BYTE read_ds1302(BYTE cmd) {
BYTE i,data;
output_high(RTC_RST);
write_ds1302_byte(cmd);
for(i=0;i<=7;++i) {
shift_right(&data,1,input(RTC_IO));
output_high(RTC_SCLK);
delay_us(2);
output_low(RTC_SCLK);
delay_us(2);
}
output_low(RTC_RST);
return(data);
}
void rtc_init() {
BYTE x;
output_low(RTC_RST);
delay_us(2);
output_low(RTC_SCLK);
write_ds1302(0x8e,0);
write_ds1302(0x90,0xa4);
x=read_ds1302(0x81);
if((x & 0x80)!=0)
write_ds1302(0x80,0);
}
int get_bcd(BYTE data)
{
int nibh;
int nibl;
nibh=data/10;
nibl=data-(nibh*10);
return((nibh<<4)|nibl);
}
int rm_bcd(BYTE data)
{
int i;
i=data;
data=(i>>4)*10;
data=data+(i<<4>>4);
return data;
}
void rtc_set_datetime(BYTE day, BYTE mth, BYTE year, BYTE dow, BYTE hr, BYTE min) {
write_ds1302(0x86,get_bcd(day));
write_ds1302(0x88,get_bcd(mth));
write_ds1302(0x8c,get_bcd(year));
write_ds1302(0x8a,get_bcd(dow));
write_ds1302(0x84,get_bcd(hr));
write_ds1302(0x82,get_bcd(min));
write_ds1302(0x80,get_bcd(0));
}
void rtc_get_date(BYTE& day, BYTE& mth, BYTE& year, BYTE& dow) {
day = rm_bcd(read_ds1302(0x87));
mth = rm_bcd(read_ds1302(0x89));
year = rm_bcd(read_ds1302(0x8d));
dow = rm_bcd(read_ds1302(0x8b));
}
void rtc_get_time(BYTE& hr, BYTE& min, BYTE& sec) {
hr = rm_bcd(read_ds1302(0x85));
min = rm_bcd(read_ds1302(0x83));
sec = rm_bcd(read_ds1302(0x81));
}
void rtc_write_nvr(BYTE address, BYTE data) {
write_ds1302(address|0xc0,data);
}
BYTE rtc_read_nvr(BYTE address) {
return(read_ds1302(address|0xc1));
}
tamamen bu ds1302 driverı