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|
;;
;; mur.sat
;;
;; Somewhen in the year 2011, mur.at will have a nano satellite launched
;; into a low earth orbit (310 km above the surface of our planet). The
;; satellite itself is a TubeSat personal satellite kit, developed and
;; launched by interorbital systems. mur.sat is a joint venture of mur.at,
;; ESC im Labor and realraum.
;;
;; Please visit the project hompage at sat.mur.at for further information.
;;
;;
;; Copyright (C) 2011 Christian Pointner <equinox@mur.at>
;;
;; This file is part of mur.sat.
;;
;; mur.sat is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; any later version.
;;
;; mur.sat is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with mur.sat. If not, see <http://www.gnu.org/licenses/>.
;;
;; -------------------------------------
;; PREAMBLE
LIST p=12F635
include "p12f635.inc"
__config _WUREN_OFF & _FCMEN_OFF & _IESO_OFF & _BOD_OFF & _CPD_OFF & _CP_OFF & _MCLRE_OFF & _PWRTE_OFF & _WDT_OFF & _INTRC_OSC_NOCLKOUT
;; -------------------------------------
;; DEFINES
;; constants
DOT EQU .256 - .29
DASH EQU .256 - .87
ESPACE EQU .256 - .29
CSPACE EQU .256 - .87
WSPACE EQU .256 - .203
ENABLE_TIME EQU .256 - .10
BEACON_INT EQU .10 ; *2 = Beacon Interval in seconds
;; I/O Pins
CWENABLE EQU GP0
CWOUT EQU GP1
SCLK EQU GP2
SDAT EQU GP4
;; variables
;; page 0 only
ELEMENT EQU H'0040'
ELECNT EQU H'0041'
CHAR EQU H'0042'
PARITY EQU H'0043'
CHARCNT EQU H'0044'
PENTLE0 EQU H'0045'
PENTLE1 EQU H'0046'
PENTLECNT EQU H'0047'
BUF EQU H'0050'
;; all pages
SECCNT EQU H'007D'
W_TEMP EQU H'007E'
STATUS_TEMP EQU H'007F'
;; -------------------------------------
;; Reset Vector
org .0
goto init
;; -------------------------------------
;; Interrupt Vector
org .4
;; save context
movwf W_TEMP
swapf STATUS,W
movwf STATUS_TEMP
bcf STATUS,RP0
bcf STATUS,RP1
btfsc PIR1,TMR1IF
goto tmr1_int
ext_int
;; TODO: read bit from GPIO,SDAT and add to received string
goto interrupt_end
tmr1_int
bcf PIR1,TMR1IF
movf SECCNT,w
btfss STATUS,Z
decf SECCNT,f
interrupt_end
;; restore context
swapf STATUS_TEMP,W
movwf STATUS
swapf W_TEMP,F
swapf W_TEMP,W
retfie
;; -------------------------------------
;; INIT
init
;; bank 1
bsf STATUS,RP0
bcf STATUS,RP1
movlw b'10000011'
movwf OPTION_REG
movlw b'11111100'
movwf TRISIO
movlw b'00000001'
movwf PIE1
movlw b'00000000'
movwf OSCCON
bcf STATUS,RP0
;; bank 0
clrf TMR1L
clrf TMR1H
movlw b'00000111'
movwf T1CON
movlw b'01000000' ; enable external interrupt bit4
movwf INTCON
movlw b'00000111'
movwf CMCON0
bcf GPIO,CWOUT
bcf GPIO,CWENABLE
movlw BEACON_INT
movwf SECCNT
bsf INTCON,GIE
goto main
;; -------------------------------------
;; TABLES
;; Morse Codes: 0=dot, 1=dash
getcw
addwf PCL,f
nop
retlw b'00010000' ; !
retlw b'01001000' ; "
retlw b'00000000' ; #
retlw b'00010010' ; $
retlw b'00000000' ; %
retlw b'01000000' ; &
retlw b'01111000' ; '
retlw b'10110000' ; (
retlw b'10110100' ; )
retlw b'00000000' ; *
retlw b'01010000' ; +
retlw b'11001100' ; ,
retlw b'10000100' ; -
retlw b'01010100' ; .
retlw b'10010000' ; /
retlw b'11111000' ; 0
retlw b'01111000' ; 1
retlw b'00111000' ; 2
retlw b'00011000' ; 3
retlw b'00001000' ; 4
retlw b'00000000' ; 5
retlw b'10000000' ; 6
retlw b'11000000' ; 7
retlw b'11100000' ; 8
retlw b'11110000' ; 9
retlw b'11100000' ; :
retlw b'10101000' ; ;
retlw b'00010100' ; <
retlw b'10001000' ; =
retlw b'10001010' ; >
retlw b'00110000' ; ?
retlw b'01000000' ; @
retlw b'01000000' ; A
retlw b'10000000' ; B
retlw b'10100000' ; C
retlw b'10000000' ; D
retlw b'00000000' ; E
retlw b'00100000' ; F
retlw b'11000000' ; G
retlw b'00000000' ; H
retlw b'00000000' ; I
retlw b'01110000' ; J
retlw b'10100000' ; K
retlw b'01000000' ; L
retlw b'11000000' ; M
retlw b'10000000' ; N
retlw b'11100000' ; O
retlw b'01100000' ; P
retlw b'11010000' ; Q
retlw b'01000000' ; R
retlw b'00000000' ; S
retlw b'10000000' ; T
retlw b'00100000' ; U
retlw b'00010000' ; V
retlw b'01100000' ; W
retlw b'10010000' ; X
retlw b'10110000' ; Y
retlw b'11000000' ; Z
;; Morse Code Length
getcwlen
addwf PCL,f
nop
retlw .5 ; !
retlw .6 ; "
retlw .0 ; #
retlw .7 ; $
retlw .0 ; %
retlw .5 ; &
retlw .6 ; '
retlw .5 ; (
retlw .6 ; )
retlw .0 ; *
retlw .5 ; +
retlw .6 ; ,
retlw .6 ; -
retlw .6 ; .
retlw .5 ; /
retlw .5 ; 0
retlw .5 ; 1
retlw .5 ; 2
retlw .5 ; 3
retlw .5 ; 4
retlw .5 ; 5
retlw .5 ; 6
retlw .5 ; 7
retlw .5 ; 8
retlw .5 ; 9
retlw .6 ; :
retlw .6 ; ;
retlw .6 ; <
retlw .5 ; =
retlw .7 ; >
retlw .6 ; ?
retlw .6 ; @
retlw .2 ; A
retlw .4 ; B
retlw .4 ; C
retlw .3 ; D
retlw .1 ; E
retlw .4 ; F
retlw .3 ; G
retlw .4 ; H
retlw .2 ; I
retlw .4 ; J
retlw .3 ; K
retlw .4 ; L
retlw .2 ; M
retlw .2 ; N
retlw .3 ; O
retlw .4 ; P
retlw .4 ; Q
retlw .3 ; R
retlw .3 ; S
retlw .1 ; T
retlw .3 ; U
retlw .4 ; V
retlw .3 ; W
retlw .4 ; X
retlw .4 ; Y
retlw .4 ; Z
;; Base32 Code
base32
addwf PCL,f
retlw 'A' - ' '
retlw 'B' - ' '
retlw 'C' - ' '
retlw 'D' - ' '
retlw 'E' - ' '
retlw 'F' - ' '
retlw 'G' - ' '
retlw 'H' - ' '
retlw 'I' - ' '
retlw 'J' - ' '
retlw 'K' - ' '
retlw 'L' - ' '
retlw 'M' - ' '
retlw 'N' - ' '
retlw 'O' - ' '
retlw 'P' - ' '
retlw 'Q' - ' '
retlw 'R' - ' '
retlw 'S' - ' '
retlw 'T' - ' '
retlw 'U' - ' '
retlw 'V' - ' '
retlw 'W' - ' '
retlw 'X' - ' '
retlw 'Y' - ' '
retlw 'Z' - ' '
retlw '2' - ' '
retlw '3' - ' '
retlw '4' - ' '
retlw '5' - ' '
retlw '6' - ' '
retlw '7' - ' '
;; fixed strings
callsign
addwf PCL,f
nop
retlw 'R' - ' '
retlw 'U' - ' '
retlw 'M' - ' '
retlw '6' - ' '
retlw 'E' - ' '
retlw 'O' - ' '
;; -------------------------------------
;; SUBROUTINES
dottime
movwf TMR0
bcf INTCON,T0IF
dot_inner
btfss INTCON,T0IF
goto dot_inner
return
;; -------------------------------------
send_char
movwf CHAR
call getcw
movwf ELEMENT
movf CHAR,w
call getcwlen
movwf ELECNT
movf ELECNT,f
btfsc STATUS,Z
return
movf CHAR,w
xorwf PARITY,f
char_next_element
bsf GPIO,CWOUT
btfss ELEMENT,7
movlw DOT
btfsc ELEMENT,7
movlw DASH
call dottime
bcf GPIO,CWOUT
rlf ELEMENT,f
decfsz ELECNT,f
goto char_espace
return
char_espace
movlw ESPACE
call dottime
goto char_next_element
;; -------------------------------------
send_callsign
movlw .6
movwf CHARCNT
callsign_next_char
call callsign
call send_char
decfsz CHARCNT,f
goto callsign_cspace
return
callsign_cspace
movlw CSPACE
call dottime
movf CHARCNT,w
goto callsign_next_char
;; -------------------------------------
send_base32
movwf PENTLECNT
case0
rrf INDF,w
movwf PENTLE0
rrf PENTLE0,f
rrf PENTLE0,w
andlw b'00011111'
call base32
call send_char
decfsz PENTLECNT,f
goto case1
return
case1
movlw CSPACE
call dottime
rlf INDF,w
movwf PENTLE0
rlf PENTLE0,w
andlw b'00011100'
movwf PENTLE0
incf FSR,f
swapf INDF,w
movwf PENTLE1
rrf PENTLE1,f
rrf PENTLE1,w
andlw b'00000011'
iorwf PENTLE0,w
call base32
call send_char
decfsz PENTLECNT,f
goto case2
return
case2
movlw CSPACE
call dottime
rrf INDF,w
andlw b'00011111'
call base32
call send_char
decfsz PENTLECNT,f
goto case3
return
case3
movlw CSPACE
call dottime
swapf INDF,w
andlw b'00010000'
movwf PENTLE0
incf FSR,f
swapf INDF,w
andlw b'00001111'
iorwf PENTLE0,w
call base32
call send_char
decfsz PENTLECNT,f
goto case4
return
case4
movlw CSPACE
call dottime
rlf INDF,w
andlw b'00011110'
movwf PENTLE0
incf FSR,f
btfsc INDF,7
bsf PENTLE0,0
movf PENTLE0,w
call base32
call send_char
decfsz PENTLECNT,f
goto case5
return
case5
movlw CSPACE
call dottime
rrf INDF,w
movwf PENTLE0
rrf PENTLE0,w
andlw b'00011111'
call base32
call send_char
decfsz PENTLECNT,f
goto case6
return
case6
movlw CSPACE
call dottime
swapf INDF,w
movwf PENTLE0
rrf PENTLE0,w
andlw b'00011000'
movwf PENTLE0
incf FSR,f
swapf INDF,w
movwf PENTLE1
rrf PENTLE1,w
andlw b'00000111'
iorwf PENTLE0,w
call base32
call send_char
decfsz PENTLECNT,f
goto case7
return
case7
movlw CSPACE
call dottime
movf INDF,w
andlw b'00011111'
call base32
call send_char
decfsz PENTLECNT,f
goto caseend
return
caseend
movlw CSPACE
call dottime
incf FSR,f
goto case0
;; -------------------------------------
send_parity
movf PARITY,w
btfsc PARITY,5
xorlw b'00000001'
andlw b'00011111'
call base32
call send_char
return
;; -------------------------------------
send_beacon
bsf GPIO,CWENABLE
movlw ENABLE_TIME
call dottime
clrf PARITY
call send_callsign
movlw WSPACE
call dottime
movlw b'10101010'
movwf BUF
movlw b'01010101'
movwf BUF + 1
movlw b'00001111'
movwf BUF + 2
movlw b'11110000'
movwf BUF + 3
movlw b'11000011'
movwf BUF + 4
movlw b'00111100'
movwf BUF + 5
movlw b'01011111'
movwf BUF + 6
movlw BUF
movwf FSR
movlw .10
call send_base32
movlw WSPACE
call dottime
call send_parity
bcf GPIO,CWENABLE
return
;; -------------------------------------
;; MAINLOOP
main
;; this gets called after reset and whenever a wakeup occured
;; (after TMR1 overrun or interrupt on GP2)
movf SECCNT,f
btfss STATUS,Z
goto powerdown
;; this gets called every 2*BEACON_INT seconds
movlw BEACON_INT
movwf SECCNT
call send_beacon
powerdown
sleep
nop
goto main
;; -------------------------------------
;; END
end
|
