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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 & _XT_OSC
__config _CONFIG2, _BOR21V & _WRT_OFF
;; -------------------------------------
;; DEFINES
;; constants
;; I/O Pins
DTMF_D0 EQU 0
DTMF_D1 EQU 1
DTMF_D2 EQU 2
DTMF_D3 EQU 3
DTMF_PWRDWN EQU 4
TTX_RESET EQU 5
TTX_SCL EQU 6
TTX_SDA EQU 7
;; variables
;; page 0 only
TMP EQU H'0020'
;; all pages
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
bcf STATUS,RP0
bcf STATUS,RP1
btfsc PIR1,RCIF
goto int_uart_rx
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
interrupt_end
;; restore context
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
;; bank 1
bsf STATUS,RP0
bcf STATUS,RP1
movlw b'11000111'
movwf OPTION_REG
clrf PSTRCON
movlw b'00010000'
movwf OSCCON
movlw b'00001111'
movwf TRISD
movlw b'00100100'
movwf TXSTA
movlw .12
movwf SPBRG
clrf SPBRGH
movlw b'00100000'
movwf PIE1
clrf PIE2
;; bank 0
bcf STATUS,RP0
bcf STATUS,RP1
movlw b'10010000'
movwf RCSTA
movlw B'01000000'
movwf INTCON
bcf PORTD,TTX_RESET ;reset TTX
nop
nop
bsf PORTD,TTX_RESET
clrf TMR0
bsf INTCON,GIE
movlw .1
movwf TMP
goto main
;; -------------------------------------
;; TABLES
;; TODO: add lookup tables if needed
;; -------------------------------------
;; SUBROUTINES
uart_rx_byte
btfsc RCSTA,FERR
goto uart_rx_fe
movf RCREG,w ; TODO: move to input string
movwf TXREG
bsf TMP,0
return
uart_rx_fe
movf RCREG,w
return
;; -------------------------------------
;; MAINLOOP
main
btfss TMP,0
goto main
bcf TMP,0
bcf PORTD,DTMF_PWRDWN
bcf INTCON,T0IF
clrf TMR0
loop
btfss INTCON,T0IF
goto loop
bsf PORTD,DTMF_PWRDWN
goto main
powerdown
sleep
nop
goto main
;; -------------------------------------
;; END
end
|
