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|
;;
;; mur.sat
;;
;; Somewhen in the year 2012, 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_ON & _PWRTE_OFF & _WDT_OFF & _INTRC_OSC_NOCLKOUT
;; -------------------------------------
;; DEFINES
;; constants
DOT_DEF EQU .256 - .21 ; .29
DASH_DEF EQU .256 - .63 ; .87
WSPACE_DEF EQU .256 - .147 ; .203
TUNE_DEF EQU DOT_DEF
BCNINTL_DEF EQU .256 - .200
BCNINTH_DEF EQU .255
START_CHAR EQU 'N'
ACK_CHAR EQU 'A'
OSC_LOW EQU b'00000000'
OSC_HIGH EQU b'01100000'
;; I/O Pins
CWENABLE EQU GP0
CWOUT EQU GP1
SCLK EQU GP2
SDAT EQU GP4
CLK_1HZ EQU GP5
;; 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'
ACK_DATA EQU H'0048'
TMP1 EQU H'0049'
TMP2 EQU H'004A'
RX_FSR_TMP EQU H'004B'
RX_CSUM EQU H'004C'
RX_BIT_CNT EQU H'004D'
RX_BYTE_CNT EQU H'004E'
RX_DLEN EQU H'004F'
RX_CMD EQU H'0050'
RX_D_START EQU H'0051'
RX_D_END EQU H'005F'
;; all pages
BEACON_INTL EQU H'0070'
BEACON_INTH EQU H'0071'
DOT EQU H'0072'
ESPACE EQU DOT
DASH EQU H'0073'
CSPACE EQU DASH
WSPACE EQU H'0074'
TUNE EQU H'0075'
NVSTATE EQU H'007A'
BEACONCNTH EQU H'007B'
BEACONCNTL EQU H'007C'
STATE EQU H'007D'
W_TEMP EQU H'007E'
STATUS_TEMP EQU H'007F'
;; bits STATE
startbeacon EQU .0
rxcomplete EQU .1
;; bits NVSTATE
safe EQU .0
;; -------------------------------------
;; 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 beacon_int_int
ext_int
bcf INTCON,INTF
btfsc STATE,rxcomplete
goto interrupt_end
bsf STATUS,RP0
movlw OSC_HIGH
movwf OSCCON
;; we are on high OSC now
bcf STATUS,RP0
bsf WDTCON,SWDTEN
clrf RX_CSUM
movf FSR,w
movwf RX_FSR_TMP
movlw RX_CMD
movwf FSR
bcf STATUS,IRP
call rx_byte
movlw b'00001111'
andwf RX_CMD,w
movwf RX_BYTE_CNT
movwf RX_DLEN
btfsc STATUS,Z
goto ext_int_send_csum
ext_int_next
incf FSR,f
call rx_byte
decfsz RX_BYTE_CNT,f
goto ext_int_next
ext_int_send_csum
;; call rx_send_csum
;; movf RX_FSR_TMP,w
;; movwf FSR
swapf RX_CMD,w
andlw b'00001111'
movwf RX_CMD
;; ext_int_wait_ack_low
;; btfsc GPIO,SCLK
;; goto ext_int_wait_ack_low
;; ext_int_wait_ack_high
;; btfss GPIO,SCLK
;; goto ext_int_wait_ack_high
;; btfss GPIO,SDAT
bsf STATE,rxcomplete
bcf WDTCON,SWDTEN
bsf STATUS,RP0
movlw OSC_LOW
movwf OSCCON
;; back on low OSC
goto interrupt_end
beacon_int_int
bcf STATUS,RP0
bcf T1CON,TMR1ON
movf BEACON_INTL,w
movwf TMR1L
movf BEACON_INTH,w
movwf TMR1H
bsf T1CON,TMR1ON
bcf PIR1,TMR1IF
bsf STATE,startbeacon
goto interrupt_end
interrupt_end
;; restore context
swapf STATUS_TEMP,W
movwf STATUS
swapf W_TEMP,F
swapf W_TEMP,W
retfie
;; -------------------------------------
;; 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'
;; -------------------------------------
;; INIT
init
;; bank 1
bcf STATUS,IRP
bsf STATUS,RP0
bcf STATUS,RP1
movlw b'01000011'
movwf OPTION_REG
movlw b'11111100'
movwf TRISIO
movlw OSC_LOW
movwf OSCCON
movlw b'00000001'
movwf PIE1
bcf STATUS,RP0
;; bank 0
movlw b'00010010'
movwf WDTCON
movlw b'01010000'
movwf INTCON
movlw b'00000111'
movwf CMCON0
movlw b'00000010'
movwf CMCON1
movlw b'00000110'
movwf T1CON
bcf GPIO,CWOUT
bcf GPIO,CWENABLE
clrf RX_DLEN
bcf STATE,rxcomplete
clrf NVSTATE ; TODO: read State from EEPROM
;; movlw .42
movlw .0
movwf BEACONCNTL ; TODO: read Beaconcnt from EEPROM
;; movlw .23
movlw .0
movwf BEACONCNTH
movlw BCNINTL_DEF ; TODO: read Beacon Interval from EEPROM
movwf BEACON_INTL
movlw BCNINTH_DEF
movwf BEACON_INTH
movlw DOT_DEF ; TODO: read cw timings from EEPROM
movwf DOT ; - DOT: length of .
movlw DASH_DEF ; - DASH: length of -
movwf DASH ; - WSPACE: length word space
movlw WSPACE_DEF ; - TUNE: tune in time of oscillator
movwf WSPACE
movlw TUNE_DEF
movwf TUNE
movf BEACON_INTL,w
movwf TMR1L
movf BEACON_INTH,w
movwf TMR1H
bcf STATE,startbeacon
bsf T1CON,TMR1ON
bsf INTCON,GIE
goto main
;; -------------------------------------
;; SUBROUTINES
rx_byte
movlw .8
movwf RX_BIT_CNT
clrf INDF
rx_byte_clk_low
btfsc GPIO,SCLK
goto rx_byte_clk_low
rx_byte_clk_high
btfss GPIO,SCLK
goto rx_byte_clk_high
btfsc GPIO,SDAT
bsf INDF,0
decfsz RX_BIT_CNT,f
goto rx_byte_next
movf INDF,w
xorwf RX_CSUM,f
return
rx_byte_next
rlf INDF,f
goto rx_byte_clk_low
;; -------------------------------------
rx_send_csum
bsf STATUS,RP0
bcf TRISIO,SDAT
bcf STATUS,RP0
movlw .8
movwf RX_BIT_CNT
rx_send_clk_low
btfsc GPIO,SCLK
goto rx_send_clk_low
rx_send_clk_high
btfss GPIO,SCLK
goto rx_send_clk_high
btfss RX_CSUM,7
bcf GPIO,SDAT
btfsc RX_CSUM,7
bsf GPIO,SDAT
decfsz RX_BIT_CNT,f
goto rx_send_next
bsf STATUS,RP0
bsf TRISIO,SDAT
bcf STATUS,RP0
return
rx_send_next
rlf RX_CSUM,f
goto rx_send_clk_low
;; -------------------------------------
dottime
movwf TMR0
bcf INTCON,T0IF
dot_inner
btfss INTCON,T0IF
goto dot_inner
return
;; -------------------------------------
send_char
movwf CHAR
movlw 'Z' + 1
subwf CHAR,w
btfsc STATUS,C
return
movlw ' '
subwf CHAR,f
btfss STATUS,C
return
btfsc STATUS,Z
return
movf CHAR,w
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
movf DOT,w
btfsc ELEMENT,7
movf DASH,w
call dottime
bcf GPIO,CWOUT
rlf ELEMENT,f
decfsz ELECNT,f
goto char_espace
return
char_espace
movf ESPACE,w
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
movf CSPACE,w
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
movf CSPACE,w
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
movf CSPACE,w
call dottime
rrf INDF,w
andlw b'00011111'
call base32
call send_char
decfsz PENTLECNT,f
goto case3
return
case3
movf CSPACE,w
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
movf CSPACE,w
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
movf CSPACE,w
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
movf CSPACE,w
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
movf CSPACE,w
call dottime
movf INDF,w
andlw b'00011111'
call base32
call send_char
decfsz PENTLECNT,f
goto caseend
return
caseend
movf CSPACE,w
call dottime
incf FSR,f
goto case0
;; -------------------------------------
send_cnt
rlf BEACONCNTL,w
movwf TMP2
rlf BEACONCNTH,w
movwf TMP1
movlw TMP1
movwf FSR
bcf STATUS,IRP
movlw .3
call send_base32
return
;; -------------------------------------
send_parity
movf PARITY,w
btfsc PARITY,5
xorlw b'00000001'
andlw b'00011111'
call base32
call send_char
movf WSPACE,w
call dottime
return
;; -------------------------------------
send_beacon
bsf GPIO,CWENABLE
movf TUNE,w
call dottime
clrf PARITY
movlw START_CHAR
call send_char
movf WSPACE,w
call dottime
call send_callsign
movf WSPACE,w
call dottime
call send_cnt
movf WSPACE,w
call dottime
call send_parity
incfsz BEACONCNTL,f
goto beacon_end
incf BEACONCNTH,f
;; TODO write new cnt value to EEPROM
beacon_end
bcf GPIO,CWENABLE
return
;; -------------------------------------
send_ack
movwf ACK_DATA
bsf GPIO,CWENABLE
movf TUNE,w
call dottime
clrf PARITY
movlw ACK_CHAR
call send_char
movf WSPACE,w
call dottime
movf RX_CMD,w
addlw 'A'
call send_char
movf WSPACE,w
call dottime
movlw RX_CMD
movwf FSR
bcf STATUS,IRP
movf RX_DLEN,w
andlw b'00001111'
movwf TMP1
btfsc STATUS,Z
goto ack_parity
ack_next
incf FSR,f
movf INDF,w
call send_char
movf CSPACE,w
call dottime
decfsz TMP1,f
goto ack_next
;; movf ACK_DATA,w
;; call send_char
movf CSPACE,w
call dottime
ack_parity
call send_parity
bcf GPIO,CWENABLE
return
;; -------------------------------------
;; MAINLOOP
main
;; this gets called after reset and whenever a wakeup occured
;; (after timer1 overflow or interrupt on GP2)
btfsc STATE,startbeacon
goto beaconint_elapsed
btfsc STATE,rxcomplete
goto msg_received
goto powerdown
;; this gets called every beacon interval
beaconint_elapsed
bcf STATE,startbeacon
btfss NVSTATE,safe
call send_beacon
goto powerdown
;; this gets called whenever a message was received from ihu
msg_received
call send_ack
bcf STATE,rxcomplete
clrf RX_DLEN
powerdown
sleep
nop
goto main
;; -------------------------------------
;; END
end
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