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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=16F887
include "p16f887.inc"
__config _CONFIG1, _DEBUG_OFF & _LVP_OFF & _FCMEN_OFF & _IESO_OFF & _BOR_NSLEEP & _CPD_OFF & _CP_OFF & _MCLRE_OFF & _PWRTE_ON & _WDT_OFF & _INTRC_OSC_CLKOUT
__config _CONFIG2, _BOR21V & _WRT_OFF
;; -------------------------------------
;; DEFINES
;; constants
;; I/O Pins
;; PortA
MPU_INT EQU .4
;; PortC
;; variables
;; page 0 only
TMP EQU H'0020'
WAIT_CNT EQU H'0021'
;; all pages
FSR_TEMP EQU H'007D'
W_TEMP EQU H'007E'
STATUS_TEMP EQU H'007F'
;; bits
;; -------------------------------------
;; Reset Vector
org 0
goto init
;; -------------------------------------
;; Interrupt Vector
org 4
;; save context
movwf W_TEMP
swapf STATUS,W
movwf STATUS_TEMP
movf FSR,w
movwf FSR_TEMP
bcf STATUS,RP0
bcf STATUS,RP1
;; dispatch interrupt sources
btfsc PIR1,TMR2IF
goto int_tmr2
btfsc PIR1,RCIF
goto int_uart_rx
goto interrupt_end
int_tmr2
movlw b'00010000'
xorwf PORTA,f
bsf ADCON0,GO
int_tmr2_adcon
btfsc ADCON0,GO
goto int_tmr2_adcon
movf ADRESH,w
movwf TXREG
bcf PIR1,TMR2IF
goto interrupt_end
int_uart_rx
call uart_rx_byte
btfsc PIR1,RCIF
call uart_rx_byte
btfss RCSTA,OERR
goto int_uart_rx_oe
goto interrupt_end
int_uart_rx_oe
bcf RCSTA,CREN
bsf RCSTA,CREN
goto interrupt_end
interrupt_end
;; restore context
movf FSR_TEMP,w
movwf FSR
swapf STATUS_TEMP,W
movwf STATUS
swapf W_TEMP,F
swapf W_TEMP,W
retfie
;; -------------------------------------
;; INIT
init
;; bank 3
bsf STATUS,RP0
bsf STATUS,RP1
movlw b'00000000'
movwf BAUDCTL
movlw b'00100000'
movwf ANSEL
;; bank 2
bcf STATUS,RP0
bsf STATUS,RP1
movlw b'10100000'
movwf CM1CON0
movlw b'10110000'
movwf CM2CON0
;; bank 1
bsf STATUS,RP0
bcf STATUS,RP1
movlw b'10000000'
movwf OPTION_REG
clrf PSTRCON
movlw b'01111000'
movwf OSCCON
movlw b'11001111'
movwf TRISA
movlw b'11111111'
movwf TRISB
movlw b'11111111'
movwf TRISC
movlw b'11111111'
movwf TRISD
movlw b'00100100'
movwf TXSTA
movlw .8
movwf SPBRG
clrf SPBRGH
movlw b'00100010'
movwf PIE1
clrf PIE2
movlw .200
movwf PR2
clrf ADCON1
;; bank 0
bcf STATUS,RP0
bcf STATUS,RP1
movlw b'10010000'
movwf RCSTA
movlw b'00001100'
movwf T2CON
movlw b'01000000'
movwf INTCON
clrf TMR2
movlw b'10010101'
movwf ADCON0
bcf PORTA,MPU_INT
clrf TMP
bsf INTCON,GIE
goto main
;; -------------------------------------
;; SUBROUTINES
wait_ms
movwf WAIT_CNT
wait_next
movlw .9
movwf TMR0
bcf INTCON,T0IF
wait_loop
btfss INTCON,T0IF
goto wait_loop
decfsz WAIT_CNT,f
goto wait_next
return
;; -------------------------------------
uart_rx_byte
btfsc RCSTA,FERR
goto uart_rx_fe
movf RCREG,w ; TODO: move to input string
movwf TMP
return
uart_rx_fe
movf RCREG,w
return
;; -------------------------------------
;; MAINLOOP
main
;; movf TMP,f
;; btfsc STATUS,Z
;; goto main
;; movlw '.'
;; movwf TXREG
;; movlw .255
;; call wait_ms
goto main
powerdown
sleep
nop
goto main
;; -------------------------------------
;; END
end
|
