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{
Set time to DS1337 by using Denpatokei(Radio Controlled Clock)
Read time from DS3231
    PropForth 4.6 
    14/08/2011 08:14:57
    
    Adding measure_timeshift
    20/10/2011 13:23:36

}

6 wconstant _1Hz                   \ 1Hz squware-wave output
1 _1Hz lshift constant _1Hzm

{
\ ( -- ) set time to DS3231  [CONV=0 RS1=RS2=0 INTCON=0]
: set_DS3231 
0 _DS3231_control_w
denpatokei

\ set second/minute/hour/week/day/month/year on stack
0
minute W@ >bcd  
hour W@ >bcd  
week W@ 
day W@ >bcd 
month W@ >bcd   
year W@ >bcd 

_DS3231_time_w           \ set time to DS3231  

\ display
." Year  " year W@ 7d0 + .   
." Month " month W@ . 
." Day   " day W@ .
." Week  " week W@ .
." Hour  " hour W@ . 
." Minute" minute W@ . 
cr

;
}

\ ( -- n1 n2 ) read temperature inside chip   n1:integer portion  n2:fractional portion
: Temp _read_temp 6 rshift 19 u* ;

\ ( -- ) write temperature-data to pad>out
: _temp_datastr Temp # # drop 2e #C # # drop ;

\ ( -- )  display rtc's data
: read_DS3231
_DS3231_time_r 
." Year  :" bcd> 7d0 + . cr
\ ." Month :" <# _rtc_mon 0 #> .cstr cr
." Month :" 10 over = if drop a else 11 over = if drop b else 12 over = if drop c thens 
<# _rtc_mon 0 #> .cstr cr
." Day   :" bcd> . cr
." week  :" <# _rtc_dow 0 #> .cstr cr
." Hour  :" bcd> . cr
." Minute:" bcd> . cr
." Second:" bcd> . cr
." Temperature:" <# _temp_datastr 0 #> .cstr ." degree"  cr
;

\ ( -- ) measure 1sec(ticks) 
: check_1Hz
_1Hzm _1Hzm waitpeq                \ wait for _1Hz to go to high
0 _1Hzm waitpeq                    \ wait for _1Hz to go to low 
cnt COG@ 
_1Hzm _1Hzm waitpeq                \ wait for _1Hz to go to high
0 _1Hzm waitpeq                    \ wait for _1Hz to go to low        
cnt COG@ swap - dup  cr
." 1sec(ticks):" . cr
." Difference(ticks):" clkfreq - .  cr
;


\ (n1 -- ) temperature-compensated
: conpensate
_write_offset 20 _DS3231_control_w
begin _DS3231_control_r 20 = if ." ." 0 else 1 then until
check_1Hz
; 

: check_temp 
begin 
_DS3231_time_r
3drop drop bcd> . bcd> . bcd> . 
<# _temp_datastr 0 #> .cstr ." degree"  cr 3e8 delms 
0 until 
;



: timeshift_>1sec
denpatokei                             \ wait 0second
_DS3231_time_r 
." Year  :" bcd> 7d0 + . cr
." Month :" <# _rtc_mon 0 #> .cstr cr
." Day   :" bcd> . cr
." week  :" <# _rtc_dow 0 #> .cstr cr
." Hour  :" bcd> . cr
." Minute:" bcd> . cr
." Second:" bcd> . cr
;

: timeshift_<1sec
denpatokei                              \ wait 0second
cnt COG@ 
_1Hzm ina COG@ and                      \ 1Hz-pulse's current status is Low or High?
if
     begin _1Hzm ina COG@ and 0= until  \ wait untl 1Hz-pulse's current status is Low
else
     begin _1Hzm ina COG@ and until     \ wait untl 1Hz-pulse's current status is High
     begin _1Hzm ina COG@ and 0= until  \ wait untl 1Hz-pulse's current status is Low
then
cnt COG@ swap - .                       \ calculate time
;







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