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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
BUF_PAGE_LEN EQU H'0050'
BUF_PAGE_CNT EQU H'0004'
BUF_OFFSET EQU H'0020'
;; FLAGS
UNDERRUN EQU .0
OVERRUN EQU .1
;; I/O Pins
;; PortA
MPU_INT EQU .4
;; PortC
;; variables
;; page 0 only
;; all pages
TMP EQU H'0070'
WAIT_CNT EQU H'0071'
FLAGS EQU H'0072'
WBUF_PAGE_PTR EQU H'0074'
WBUF_PAGE_NUM EQU H'0075'
RBUF_PAGE_PTR EQU H'0076'
RBUF_PAGE_NUM EQU H'0077'
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
;; 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
call wbuf_next
btfsc FLAGS,OVERRUN
goto int_tmr2_end
movf ADRESH,w
movwf INDF
movwf TXREG
int_tmr2_end
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
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'10000010'
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 .250 ;; 8kHz
movlw .200 ;; 5kHz
; movlw .156 ;; ~50Hz
movwf PR2
clrf ADCON1
;; bank 0
bcf STATUS,RP0
bcf STATUS,RP1
movlw b'10010000'
movwf RCSTA
; movlw b'00000100' ;; 8kHz
movlw b'00001100' ;; 5kHz
; movlw b'01111110' ;; ~50Hz
movwf T2CON
movlw b'01000000'
movwf INTCON
clrf TMR2
movlw b'10010101'
movwf ADCON0
; bcf PORTA,MPU_INT
call wbuf_reset
call rbuf_reset
clrf TMP
bsf INTCON,GIE
goto main
;; -------------------------------------
;; TABLES
digit
addwf PCL,f
retlw '0'
retlw '1'
retlw '2'
retlw '3'
retlw '4'
retlw '5'
retlw '6'
retlw '7'
retlw '8'
retlw '9'
retlw 'A'
retlw 'B'
retlw 'C'
retlw 'D'
retlw 'E'
retlw 'F'
;; -------------------------------------
;; SUBROUTINES
wait_ms
movwf WAIT_CNT
wait_next
movlw .6
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
;; -------------------
wbuf_reset
movlw BUF_PAGE_LEN - 1
movwf WBUF_PAGE_PTR
movlw BUF_PAGE_CNT - 1
movwf WBUF_PAGE_NUM
bcf FLAGS,OVERRUN
;; -------------------
wbuf_next
btfsc FLAGS,UNDERRUN
goto wbuf_move_ptr
movf RBUF_PAGE_NUM,w
xorwf WBUF_PAGE_NUM,w
btfss STATUS,Z
goto wbuf_move_ptr
movf RBUF_PAGE_PTR,w
xorwf WBUF_PAGE_PTR,w
btfss STATUS,Z
goto wbuf_move_ptr
bsf FLAGS,OVERRUN
return
wbuf_move_ptr
bcf FLAGS,UNDERRUN
movf WBUF_PAGE_PTR,f
btfsc STATUS,Z
goto wbuf_next_page
decf WBUF_PAGE_PTR,f
goto wbuf_fill_fsr
wbuf_next_page
movlw BUF_PAGE_LEN - 1
movwf WBUF_PAGE_PTR
movf WBUF_PAGE_NUM,f
btfsc STATUS,Z
goto wbuf_next_cycle
decf WBUF_PAGE_NUM,f
goto wbuf_fill_fsr
wbuf_next_cycle
movlw BUF_PAGE_CNT - 1
movwf WBUF_PAGE_NUM
wbuf_fill_fsr
movlw BUF_OFFSET
addwf WBUF_PAGE_PTR,w
movwf FSR
btfss WBUF_PAGE_NUM,0
bcf FSR,7
btfsc WBUF_PAGE_NUM,0
bsf FSR,7
btfss WBUF_PAGE_NUM,1
bcf STATUS,IRP
btfsc WBUF_PAGE_NUM,1
bsf STATUS,IRP
return
;; -------------------
rbuf_reset
movlw BUF_PAGE_LEN - 1
movwf RBUF_PAGE_PTR
movlw BUF_PAGE_CNT - 1
movwf RBUF_PAGE_NUM
bsf FLAGS,UNDERRUN
;; -------------------
rbuf_next
btfsc FLAGS,OVERRUN
goto rbuf_move_ptr
movf WBUF_PAGE_NUM,w
xorwf RBUF_PAGE_NUM,w
btfss STATUS,Z
goto rbuf_move_ptr
movf WBUF_PAGE_PTR,w
xorwf RBUF_PAGE_PTR,w
btfss STATUS,Z
goto rbuf_move_ptr
bsf FLAGS,UNDERRUN
return
rbuf_move_ptr
bcf FLAGS,OVERRUN
movf RBUF_PAGE_PTR,f
btfsc STATUS,Z
goto rbuf_next_page
decf RBUF_PAGE_PTR,f
goto rbuf_fill_fsr
rbuf_next_page
movlw BUF_PAGE_LEN - 1
movwf RBUF_PAGE_PTR
movf RBUF_PAGE_NUM,f
btfsc STATUS,Z
goto rbuf_next_cycle
decf RBUF_PAGE_NUM,f
goto rbuf_fill_fsr
rbuf_next_cycle
movlw BUF_PAGE_CNT - 1
movwf RBUF_PAGE_NUM
rbuf_fill_fsr
movlw BUF_OFFSET
addwf RBUF_PAGE_PTR,w
movwf FSR
btfss RBUF_PAGE_NUM,0
bcf FSR,7
btfsc RBUF_PAGE_NUM,0
bsf FSR,7
btfss RBUF_PAGE_NUM,1
bcf STATUS,IRP
btfsc RBUF_PAGE_NUM,1
bsf STATUS,IRP
return
;; -------------------------------------
;; MAINLOOP
main
;; movf TMP,f
;; btfsc STATUS,Z
;; goto main
goto main
powerdown
sleep
nop
goto main
;; -------------------------------------
;; END
end
|
