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GPSClock.asm
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//////////////
// #define DEBUG
//////////////
// Permanent DST / use jumper for manual DST control
// #define NO_DST
//////////////
//
// #define BASE_TZ_OFFSET 0
// #define FRACTIONAL_OFFSET 45
//
// #define TZ_LONDON
//////////////
#define JANUARY 1
#define FEBRUARY 2
#define MARCH 3
#define APRIL 4
#define MAY 5
#define JUNE 6
#define JULY 7
#define AUGUST 8
#define SEPTEMBER 9
#define OCTOBER 10
#define NOVEMBER 11
#define DECEMBER 12
#define FIRST_SUNDAY 100
#define LAST_FRIDAY 101
#define LAST_SUNDAY 102
#define SECOND_SUNDAY 103
#define FRIDAY_BEFORE_LAST_SUNDAY 104
#define SATURDAY_BEFORE_LAST_SUNDAY 105
#define FOURTH_SUNDAY 106
#define THIRD_SUNDAY 107
#ifdef TZ_LONDON
#define BASE_TZ_OFFSET 0
#define DST_START_MONTH MARCH
#define DST_START_DAY LAST_SUNDAY
#define DST_END_MONTH OCTOBER
#define DST_END_DAY LAST_SUNDAY
#endif
#ifdef TZ_CENTRAL_EUROPE
#define BASE_TZ_OFFSET 1
#define DST_START_MONTH MARCH
#define DST_START_DAY LAST_SUNDAY
#define DST_END_MONTH OCTOBER
#define DST_END_DAY LAST_SUNDAY
#endif
#ifdef TZ_EASTERN_EUROPE
#define BASE_TZ_OFFSET 2
#define DST_START_MONTH MARCH
#define DST_START_DAY LAST_SUNDAY
#define DST_END_MONTH OCTOBER
#define DST_END_DAY LAST_SUNDAY
#endif
; Most of Atlantic time does not observe DST, but a few regions do (e.g. Bermuda)
#ifdef TZ_US_ATLANTIC
#define BASE_TZ_OFFSET -4
#define DST_START_MONTH MARCH
#define DST_START_DAY SECOND_SUNDAY
#define DST_END_MONTH NOVEMBER
#define DST_END_DAY FIRST_SUNDAY
#define DST_SWITCH_AT_2AM_LOCAL_TIME
#endif
#ifdef TZ_US_EASTERN
#define BASE_TZ_OFFSET -5
#define DST_START_MONTH MARCH
#define DST_START_DAY SECOND_SUNDAY
#define DST_END_MONTH NOVEMBER
#define DST_END_DAY FIRST_SUNDAY
#define DST_SWITCH_AT_2AM_LOCAL_TIME
#endif
#ifdef TZ_US_CENTRAL
#define BASE_TZ_OFFSET -6
#define DST_START_MONTH MARCH
#define DST_START_DAY SECOND_SUNDAY
#define DST_END_MONTH NOVEMBER
#define DST_END_DAY FIRST_SUNDAY
#define DST_SWITCH_AT_2AM_LOCAL_TIME
#endif
#ifdef TZ_US_MOUNTAIN
#define BASE_TZ_OFFSET -7
#define DST_START_MONTH MARCH
#define DST_START_DAY SECOND_SUNDAY
#define DST_END_MONTH NOVEMBER
#define DST_END_DAY FIRST_SUNDAY
#define DST_SWITCH_AT_2AM_LOCAL_TIME
#endif
; Phoenix is Mountain Time but no DST
#ifdef TZ_US_ARIZONA
#define BASE_TZ_OFFSET -7
#define NO_DST
#define INDICATE_UTC
#endif
#ifdef TZ_US_PACIFIC
#define BASE_TZ_OFFSET -8
#define DST_START_MONTH MARCH
#define DST_START_DAY SECOND_SUNDAY
#define DST_END_MONTH NOVEMBER
#define DST_END_DAY FIRST_SUNDAY
#define DST_SWITCH_AT_2AM_LOCAL_TIME
#endif
#ifdef TZ_US_ALASKA
#define BASE_TZ_OFFSET -9
#define DST_START_MONTH MARCH
#define DST_START_DAY SECOND_SUNDAY
#define DST_END_MONTH NOVEMBER
#define DST_END_DAY FIRST_SUNDAY
#define DST_SWITCH_AT_2AM_LOCAL_TIME
#endif
; Some areas on Hawaii-Aleutian time observe DST (parts of Alaska), but Hawaii does not
#ifdef TZ_HAWAII
#define BASE_TZ_OFFSET -10
#define NO_DST
#define INDICATE_UTC
#endif
#ifdef TZ_HAWAII_WITH_DST
#define BASE_TZ_OFFSET -10
#define DST_START_MONTH MARCH
#define DST_START_DAY SECOND_SUNDAY
#define DST_END_MONTH NOVEMBER
#define DST_END_DAY FIRST_SUNDAY
#endif
#ifdef TZ_NEWZEALAND
#define BASE_TZ_OFFSET 12
#define DST_START_MONTH SEPTEMBER
#define DST_START_DAY LAST_SUNDAY
#define DST_END_MONTH APRIL
#define DST_END_DAY FIRST_SUNDAY
#define DST_SWITCH_AT_2AM_LOCAL_TIME ; switches back at 3AM
#endif
#ifdef TZ_AUSTRALIA_EASTERN
#define BASE_TZ_OFFSET 10
#define DST_START_MONTH OCTOBER
#define DST_START_DAY FIRST_SUNDAY
#define DST_END_MONTH APRIL
#define DST_END_DAY FIRST_SUNDAY
#define DST_SWITCH_AT_2AM_LOCAL_TIME ; switches back at 3AM
#endif
; Australia Eastern Time without DST
#ifdef TZ_AUSTRALIA_QUEENSLAND
#define BASE_TZ_OFFSET 10
#define NO_DST
#define INDICATE_UTC
#endif
#ifdef TZ_AUSTRALIA_CENTRAL
#define BASE_TZ_OFFSET 9
#define FRACTIONAL_OFFSET 30
#define DST_START_MONTH OCTOBER
#define DST_START_DAY FIRST_SUNDAY
#define DST_END_MONTH APRIL
#define DST_END_DAY FIRST_SUNDAY
#define DST_SWITCH_AT_2AM_LOCAL_TIME ; switches back at 3AM
#endif
#ifdef TZ_AUSTRALIA_WESTERN
#define BASE_TZ_OFFSET 8
#define NO_DST
#define INDICATE_UTC
#endif
; Korea KST
#ifdef TZ_SEOUL
#define BASE_TZ_OFFSET 9
#define NO_DST
#define INDICATE_UTC
#endif
#ifdef TZ_INDOCHINA
#define BASE_TZ_OFFSET 7
#define NO_DST
#define INDICATE_UTC
#endif
#ifdef TZ_INDIA
#define BASE_TZ_OFFSET 5
#define FRACTIONAL_OFFSET 30
#define NO_DST
#endif
#ifdef TZ_NEPAL
#define BASE_TZ_OFFSET 5
#define FRACTIONAL_OFFSET 45
#define NO_DST
#endif
// Newfoundland is -3:30, but fractional offset can only be positive
#ifdef TZ_NEWFOUNDLAND
#define BASE_TZ_OFFSET -4
#define FRACTIONAL_OFFSET 30
#define DST_START_MONTH MARCH
#define DST_START_DAY SECOND_SUNDAY
#define DST_END_MONTH NOVEMBER
#define DST_END_DAY FIRST_SUNDAY
#endif
#ifdef TZ_JAPAN
#define BASE_TZ_OFFSET 9
#define NO_DST
#define INDICATE_UTC
#endif
// Brazil abolished DST in 2019
#ifdef TZ_BRAZIL
#define BASE_TZ_OFFSET -3
#define NO_DST
#endif
#ifndef NO_DST
#if (DST_START_MONTH < DST_END_MONTH)
#define NORTHERN_HEMISPHERE
#else
#define SOUTHERN_HEMISPHERE
#endif
#endif
.undef XH
.undef XL
.undef YH
.undef YL
.def dCentiSeconds = r22
.def dDeciSeconds = r23
.def dSeconds = r24
.def dTenSeconds = r25
.def dMinutes = r26
.def dTenMinutes = r27
.def dHours = r28
.def dTenHours = r29
.def dDays = r0
.def dTenDays = r1
.def dMonths = r2
.def dTenMonths = r3
.def dYears = r4
.def dTenYears = r5
.def fullYears = r6
.def fullMonths = r7
.def daysInMonth = r8 ;BCD
.def dGMT = r9
.def dBST = r10
.def daysInLastMonth = r11 ;BCD
.dseg
centiSeconds: .byte 1
deciSeconds: .byte 1
seconds: .byte 1
tenSeconds: .byte 1
minutes: .byte 1
tenMinutes: .byte 1
hours: .byte 1
tenHours: .byte 1
days: .byte 1
tenDays: .byte 1
months: .byte 1
tenMonths: .byte 1
years: .byte 1
tenYears: .byte 1
fix: .byte 1
fixDisplay: .byte 1
dataValid: .byte 1
.cseg
; reset
rjmp init
; int 0
in r15,SREG
rjmp timingAdjust
; ldi dDeciSeconds,9 ;nop
; ldi dCentiSeconds,9 ;nop
nop
; timer1 compa
in r15,SREG
rollover:
inc dCentiSeconds
cpi dCentiSeconds,10
breq overflow1
ldi r18,$01
lds r19, fixDisplay
eor r19,dCentiSeconds
;sbrs dSeconds,0
;ori r19,0b10000000
rcall shiftTime
out SREG,r15
reti
overflow1:
lds r19, fix
sts fixDisplay, r19
clr dCentiSeconds
ldi r18,$01
eor r19,dCentiSeconds
;sbrs dSeconds,0
;ori r19,0b10000000
rcall shiftTime
inc dDeciSeconds
cpi dDeciSeconds,10
breq overflow2
ldi r18,$02
lds r19,fixDisplay
eor r19,dDeciSeconds
;sbrs dSeconds,0
;ori r19,0b10000000
rcall shiftTime
out SREG,r15
reti
overflow2:
clr dDeciSeconds
ldi r18,$02
lds r19,fixDisplay
eor r19,dDeciSeconds
; sbrs dSeconds,0
; ori r19,0b10000000
rcall shiftTime
inc dSeconds
cpi dSeconds,(10 +0b10000000)
breq overflow3
ldi r18,$03
mov r19,dSeconds
ori r19,0b10000000
rcall shiftTime
out SREG,r15
reti
overflow3:
ldi dSeconds,0b10000000
ldi r18,$03
mov r19,dSeconds
ori r19,0b10000000
rcall shiftTime
inc dTenSeconds
cpi dTenSeconds,6
breq overflow4
ldi r18,$04
mov r19,dTenSeconds
rcall shiftTime
out SREG,r15
reti
overflow4:
clr dTenSeconds
ldi r18,$04
mov r19,dTenSeconds
rcall shiftTime
inc dMinutes
cpi dMinutes,10
breq overflow5
ldi r18,$05
mov r19,dMinutes
rcall shiftTime
out SREG,r15
reti
overflow5:
clr dMinutes
ldi r18,$05
mov r19,dMinutes
rcall shiftTime
inc dTenMinutes
cpi dTenMinutes,6
breq overflow6
ldi r18,$06
mov r19,dTenMinutes
rcall shiftTime
out SREG,r15
reti
overflow6:
clr dTenMinutes
ldi r18,$06
mov r19,dTenMinutes
rcall shiftTime
inc dHours
ldi r18,2
cpi dHours,4
cpc dTenHours,r18
breq overflow8
cpi dHours,10
breq overflow7
ldi r18,$07
mov r19,dHours
rcall shiftTime
out SREG,r15
reti
overflow7:
clr dHours
ldi r18,$07
mov r19,dHours
rcall shiftTime
inc dTenHours
ldi r18,$08
mov r19,dTenHours
rcall shiftTime
out SREG,r15
reti
overflow8:
clr dTenHours
clr dHours
ldi r18,$07
mov r19,dHours
rcall shiftTime
ldi r18,$08
mov r19,dTenHours
rcall shiftTime
; inc dDays
mov r18,dTenDays
swap r18
;andi r18,$F0
or r18,dDays
cp daysInMonth,r18
breq overflow10
inc dDays
ldi r18,10
cp dDays,r18
breq overflow9
ldi r18,$01
mov r19,dDays
or r19,dBST
rcall shiftDate
out SREG,r15
reti
overflow9:
clr dDays
ldi r18,$01
mov r19,dDays
or r19,dBST
rcall shiftDate
inc dTenDays
ldi r18,$02
mov r19,dTenDays
or r19,dGMT
rcall shiftDate
out SREG,r15
reti
overflow10:
clr dTenDays
ldi r18,$01
mov dDays,r18 ; load dDays 1
mov r19,dDays
or r19,dBST
rcall shiftDate
ldi r18,$02
mov r19,dTenDays
or r19,dGMT
rcall shiftDate
ldi r18,1
ldi r19,2 + 0b10000000
cp dMonths,r19
cpc dTenMonths,r18
breq overflow12
ldi r18,10 + 0b10000000
inc dMonths
cp dMonths,r18
breq overflow11
ldi r18,$03
mov r19,dMonths
rcall shiftDate
out SREG,r15
reti
overflow11:
ldi r19,0b10000000
mov dMonths,r19
ldi r18,$03
rcall shiftDate
inc dTenMonths
ldi r18,$04
mov r19,dTenMonths
rcall shiftDate
out SREG,r15
reti
overflow12:
ldi r18,0b10000001
mov dMonths,r18
clr dTenMonths
ldi r18,$03
mov r19,dMonths
rcall shiftDate
ldi r18,$04
mov r19,dTenMonths
rcall shiftDate
inc dYears
ldi r18,10+0b10000000
cp dYears,r18
breq overflow13
ldi r18,$05
mov r19,dYears
rcall shiftDate
out SREG,r15
reti
overflow13:
ldi r19,0b10000000
mov dYears,r19
ldi r18,$05
rcall shiftDate
inc dTenYears
ldi r18,$06
mov r19,dTenYears
rcall shiftDate
out SREG,r15
reti
/*
Pin Configurations:
RESET
PD0 GPS_DATA
PD1 - [UTC Mode with Crystal]
PA1 [ XTAL ] UTC Mode
PA0 [ XTAL ] PermaDST
PD2 PPS
PD3 - [PermaDST with Crystal]
PD4 -
PD5 DisplayTest
GND
PD6 DST_ENABLE
PB0 SPI_DATA
PB1 SPI_CLK
PB2 LD_TIME
PB3 LD_DATE
PB4 -
PB5 -
PB6 -
PB7 -
VCC
*/
init:
; Load calibration byte from EEPROM, if present
clr r16
out EEAR, r16
sbi EECR,EERE
in r16,EEDR
sbrs r16,7
out OSCCAL, r16
nop
ldi r16, 0b10000000
sts fix, r16
ldi r16, 0b00000000
sts dataValid, r16
ldi r16, (1<<WGM12|1<<CS11) ;/8
out TCCR1B,r16
ldi r16,high(10000)
out OCR1AH,r16
ldi r16, low(10000)
out OCR1AL,r16
ldi r16,1<<OCIE1A
out TIMSK,r16
ldi r16,(1<<ISC01|1<<ISC00)
out MCUCR,r16
ldi r16,1<<INT0
out GIMSK,r16
ldi r16,0b00001111
out DDRB,r16
ldi r16,0
out PORTB,r16
out DDRD,r16
out DDRA,r16
#ifdef USE_CRYSTAL
ldi r16, 1<<6 | 1<<5 | 1<<1 | 1<<3
out PORTD,r16
#else
ldi r16, 1<<6 | 1<<5
out PORTD,r16
ldi r16, 1<<0 | 1<<1
out PORTA, r16
#endif
ldi r16,0
out UBRRH,r16
ldi r16,51
out UBRRL,r16
ldi r16,(1<<RXEN)
out UCSRB,r16
ldi r16,(1<<UCSZ1|1<<UCSZ0)
out UCSRC,r16
ldi r18,$09 ;Decode mode
ldi r19,$FF ;Code B all digits
rcall shiftBoth
ldi r18,$0A ;Intensity
ldi r19,$0F
rcall shiftBoth
ldi r18,$0B ;Scan Limit
ldi r19,$07 ;3 digits
rcall shiftBoth
ldi r18,$FF ;Display test
ldi r19,$00
sbis PIND,5
inc r19
rcall shiftBoth
ldi r18,$0C ;Shutdown
ldi r19,$01 ;Normal operation
rcall shiftBoth
clr dTenHours
clr dHours
clr dTenMinutes
clr dMinutes
clr dTenSeconds
ldi dSeconds, 0b10000000
clr dDeciSeconds
clr dCentiSeconds
ldi r18,$08
ldi r19,10
rcall shiftDate
ldi r18,$07
ldi r19,10
rcall shiftDate
ldi r18,$06
ldi r19,10
rcall shiftDate
ldi r18,$05
ldi r19,10 +0b10000000
rcall shiftDate
ldi r18,$04
ldi r19,10
rcall shiftDate
ldi r18,$03
ldi r19,10 +0b10000000
rcall shiftDate
ldi r18,$02
ldi r19,10
;or r19,dGMT
rcall shiftDate
ldi r18,$01
ldi r19,10
;or r19,dBST
rcall shiftDate
ldi r18,$08
ldi r19,10
rcall shiftTime
ldi r18,$07
ldi r19,10
rcall shiftTime
ldi r18,$06
ldi r19,10
rcall shiftTime
ldi r18,$05
ldi r19,10
rcall shiftTime
ldi r18,$04
ldi r19,10
rcall shiftTime
ldi r18,$03
ldi r19,10
rcall shiftTime
//////////////////////////
#ifdef DEBUG
ldi r16,1
sts tenYears,r16
ldi r16,8 +0b10000000
sts years,r16
ldi r16,0
sts tenMonths,r16
ldi r16,1 +0b10000000
sts months,r16
ldi r16,0
sts tenDays,r16
ldi r16,1
sts days,r16
ldi r16,0
sts tenHours,r16
ldi r16,0
sts hours,r16
ldi r16,4
sts tenMinutes,r16
ldi r16,9
sts minutes,r16
ldi r16,5
sts tenSeconds,r16
ldi r16,5 +0b10000000
sts seconds,r16
ldi r16,5
sts deciSeconds,r16
ldi r16,5
sts centiSeconds,r16
lds r20, tenMonths
ldi r21,10
clr fullMonths
sbrc r20,0
mov fullMonths,r21
lds r20, months
andi r20,$0F
add fullMonths,r20
lds r20,tenYears
clr fullYears
yearLoop2:
add fullYears,r21
dec r20
brne yearLoop2
lds r20,years
andi r20,$0F
add fullYears,r20
#endif
////////////////////
main:
sei
//////////////
#ifndef DEBUG
///////////////
rcall receiveByte
cpi r20, '$'
brne main
rcall receiveByte
cpi r20, 'G'
brne main
rcall receiveByte
;cpi r20, 'P'
;brne main
rcall receiveByte
cpi r20, 'R'
brne main
rcall receiveByte
cpi r20, 'M'
brne main
rcall receiveByte
cpi r20, 'C'
brne main
rcall receiveByte
rcall receiveByte
cpi r20, ','
breq main
andi r20,$0F
sts tenHours,r20
rcall receiveByte
andi r20,$0F
sts hours,r20
rcall receiveByte
andi r20,$0F
sts tenMinutes,r20
rcall receiveByte
andi r20,$0F
sts minutes,r20
rcall receiveByte
andi r20,$0F
sts tenSeconds,r20
rcall receiveByte
andi r20,$0F
ori r20,0b10000000
sts seconds,r20
rcall receiveByte; dot
rcall receiveByte
andi r20,$0F
sts deciSeconds,r20
rcall receiveByte
andi r20,$0F
sts centiSeconds,r20
rcall waitForComma ; end of milliseconds
rcall receiveByte
cpi r20, 'A'
brne dataNotValid
#ifndef DISABLE_BLINKING_ENTIRELY
ldi r21,0b10000000
sts dataValid,r21
#endif
dataNotValid:
rcall waitForComma ; status
rcall waitForComma ; latitude
rcall waitForComma ; hemisphere
rcall waitForComma ; longitude
rcall waitForComma ; east west
rcall waitForComma ; speed
rcall waitForComma ; course
rcall receiveByte
andi r20,$0F
sts tenDays,r20
rcall receiveByte
andi r20,$0F
sts days,r20
rcall receiveByte
andi r20,$0F
sts tenMonths,r20
ldi r21,10
clr fullMonths
sbrc r20,0
mov fullMonths,r21
rcall receiveByte
andi r20,$0F
add fullMonths,r20
ori r20,0b10000000
sts months,r20
rcall receiveByte
andi r20,$0F
sts tenYears,r20
clr fullYears
yearLoop:
add fullYears,r21
dec r20
brne yearLoop
rcall receiveByte
andi r20,$0F
add fullYears,r20
ori r20,0b10000000
sts years,r20
///////////////////////////
#else
nop
nop
nop
nop
nop
#endif
/////////////////////////////
cli
ldi ZH, high(monthLookup*2)
ldi ZL, low(monthLookup*2)
add ZL, fullMonths