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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_ON & _FCMEN_OFF & _IESO_OFF & _BOD_OFF & _CPD_OFF & _CP_OFF & _MCLRE_OFF & _PWRTE_OFF & _WDT_OFF & _INTRC_OSC_NOCLKOUT
;; -------------------------------------
;; DEFINES
BEACON_INT EQU .3 ; *2 = Beacon Interval in seconds
SECCNT EQU H'007D'
CHAR EQU H'0041'
CHARCNT EQU H'0042'
ELEMENT EQU H'0043'
ELECNT EQU H'0044'
DOT EQU .256 - .29
DASH EQU .256 - .87
ESPACE EQU .256 - .29
CSPACE EQU .256 - .87
WSPACE EQU .256 - .203
CWENABLE EQU GP0
CWOUT EQU GP1
SCLK EQU GP2
SDAT EQU GP4
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
btfss INTCON,INTF
goto tmr1_int
ext_int
;; TODO: read bit from GPIO,SDAT and add to received string
goto interrupt_end
tmr1_int
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'10000001'
movwf PIE1
movlw b'00000000'
movwf OSCCON
bcf STATUS,RP0
;; bank 0
movlw b'01010000'
movwf INTCON
movlw b'00000111'
movwf T1CON
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
;; test string
string
addwf PCL,f
nop
retlw 'T' - ' '
retlw 'A' - ' '
retlw 'S' - ' '
retlw '.' - ' '
retlw 'R' - ' '
retlw 'U' - ' '
retlw 'M' - ' '
;; -------------------------------------
;; SUBROUTINES
dottime
movwf TMR0
bcf INTCON,T0IF
dot_inner
btfss INTCON,T0IF
goto dot_inner
return
;; -------------------------------------
send_beacon
bsf GPIO,CWENABLE
movlw .7
movwf CHARCNT
beacon_next_char
movf CHARCNT,w
call string
call getcw
movwf ELEMENT
movf CHARCNT,w
call string
call getcwlen
movwf ELECNT
movf ELECNT,f
btfsc STATUS,Z
goto beacon_invalid_char
beacon_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 beacon_element_space
movlw CSPACE
call dottime
beacon_invalid_char
decfsz CHARCNT,f
goto beacon_next_char
bcf GPIO,CWENABLE
return
beacon_element_space
movlw ESPACE
call dottime
goto beacon_next_element
;; -------------------------------------
;; 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 BEACON_INT*2 seconds
movlw BEACON_INT
movwf SECCNT
call send_beacon
powerdown
sleep
goto main
;; -------------------------------------
;; END
end
|
