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|
;;
;; spreadspace pic utils
;;
;;
;; Copyright (C) 2011 Christian Pointner <equinox@spreadspace.org>
;;
;; This file is part of spreadspace pic utils.
;;
;; spreadspace pic utils 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.
;;
;; spreadspace pic utils 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 spreadspace pic utils. If not, see <http://www.gnu.org/licenses/>.
;;
;; -------------------------------------
;; PREAMBLE
LIST p=16F1847
include "p16f1847.inc"
__config _CONFIG1, _FOSC_INTOSC & _WDTE_OFF & _PWRTE_OFF & _MCLRE_ON & _CP_OFF & _CPD_OFF & _BOREN_OFF & _CLKOUTEN_OFF & _IESO_OFF & _FCMEN_OFF
__config _CONFIG2, _WRT_OFF & _PLLEN_OFF & _STVREN_OFF & _BORV_LO & _LVP_OFF
;; -------------------------------------
;; DEFINES
CNT0 EQU H'0020'
CNT1 EQU H'0021'
;; -------------------------------------
;; OFFSET
org .0
goto init
;; -------------------------------------
;; Interrupts
org .4
clrf BSR
btfsc PIR1,SSP1IF
goto int_spi
retfie
int_spi
bsf PORTA,7
nop
bcf PORTA,7
retfie
;; -------------------------------------
;; INIT
init
;; BANK 4
movlw b'00000100'
movwf BSR
movlw b'00100100'
movwf SSP1CON1
movlw b'00010000'
movwf SSP1CON3
movlw b'00000000'
movwf SSP1STAT
;; BANK 3
movlw b'00000011'
movwf BSR
clrf ANSELA
clrf ANSELB
;; BANK 2
movlw b'00000010'
movwf BSR
;; BANK 1
movlw b'00000001'
movwf BSR
movlw b'01111111'
movwf TRISA
movlw b'01110011'
movwf TRISB
movlw b'01011000'
movwf OSCCON
movlw b'01000000'
movwf PIE1
;; BANK 0
clrf BSR
clrf PIR1
bsf INTCON,GIE
bcf PORTA,7
;; -------------------------------------
;; MAINLOOP
main
movlw .50
movwf CNT0
outer
movlw .255
movwf CNT1
inner
decfsz CNT1,f
goto inner
decfsz CNT0,f
goto outer
movlw b'00001000'
xorwf PORTB,f
goto main
;; -------------------------------------
;; END
end
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