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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
;; constants
BUF_STARTH EQU 020h
BUF_STARTL EQU 000h
BUF_ENDH EQU 023h
BUF_ENDL EQU 0BFh
;; I/O Pins
;; PortA
C1m EQU .0
C2p EQU .1
AMP_OUT EQU .2
ADC_IN EQU .3
CCP4 EQU .4
;; PortB
SDI EQU .1
SDO EQU .2
INT EQU .3
SCK EQU .4
CS EQU .5
FILTER_EN EQU .7
;; variables
;; all Pages
CNT0 EQU H'0070'
CNT1 EQU H'0071'
CNT2 EQU H'0072'
TMP EQU H'0073'
FLAGS EQU H'007F'
;; bits
;; FLAGS
UNDERRUN EQU .0
OVERRUN EQU .1
;; -------------------------------------
;; OFFSET
org .0
goto init
;; -------------------------------------
;; Interrupts
org .4
movlb b'00000000'
btfsc PIR1,SSP1IF
goto int_spi
retfie
int_spi
bsf PORTA,7
bcf PIR1,SSP1IF
movlb b'00000100'
movf SSP1BUF,w
incf TMP,f
movf TMP,w
movwf SSP1BUF
movlb b'00000000'
bcf PORTA,7
retfie
;; -------------------------------------
;; SUBROUTINES
wbuf_reset
movlw BUF_STARTH
movwf FSR0H
movlw BUF_STARTL
movwf FSR0L
bcf FLAGS,OVERRUN
return
;; -------------------
wbuf_next
btfsc FLAGS,UNDERRUN
goto wbuf_move_ptr
movf FSR1H,w
xorwf FSR0H,w
btfss STATUS,Z
goto wbuf_move_ptr
movf FSR1L,w
xorwf FSR0L,w
btfss STATUS,Z
goto wbuf_move_ptr
bsf FLAGS,OVERRUN
return
wbuf_move_ptr
bcf FLAGS,UNDERRUN
addfsr FSR0,1
movf FSR0H,w
sublw BUF_ENDH
btfss STATUS,C
goto wbuf_wraparound
btfss STATUS,Z
return
movf FSR0L,w
sublw BUF_ENDL
btfsc STATUS,C
return
wbuf_wraparound
movlw BUF_STARTH
movwf FSR0H
movlw BUF_STARTL
movwf FSR0L
return
;; -------------------
rbuf_reset
movlw BUF_STARTH
movwf FSR1H
movlw BUF_STARTL
movwf FSR1L
bsf FLAGS,UNDERRUN
;; -------------------
rbuf_next
btfsc FLAGS,OVERRUN
goto rbuf_move_ptr
movf FSR0H,w
xorwf FSR1H,w
btfss STATUS,Z
goto rbuf_move_ptr
movf FSR0L,w
xorwf FSR1L,w
btfss STATUS,Z
goto rbuf_move_ptr
bsf FLAGS,UNDERRUN
return
rbuf_move_ptr
bcf FLAGS,OVERRUN
addfsr FSR1,1
movf FSR1H,w
sublw BUF_ENDH
btfss STATUS,C
goto rbuf_wraparound
btfss STATUS,Z
return
movf FSR1L,w
sublw BUF_ENDL
btfsc STATUS,C
return
rbuf_wraparound
movlw BUF_STARTH
movwf FSR1H
movlw BUF_STARTL
movwf FSR1L
return
;; -------------------------------------
;; INIT
init
;; BANK 4
movlb b'00000100'
movlw b'01000000'
movwf SSP1STAT
movlw b'00010000'
movwf SSP1CON3
movlw b'00100100'
movwf SSP1CON1
;; BANK 3
movlb b'00000011'
clrf ANSELA
clrf ANSELB
;; BANK 2
movlb b'00000010'
;; BANK 1
movlb b'00000001'
movlw b'01111111'
movwf TRISA
movlw b'01110011'
movwf TRISB
; movlw b'01011000' ; 1 MHz
; movlw b'01100000' ; 2 MHz
movlw b'01101000' ; 4 MHz
; movlw b'01110000' ; 8 MHz
; movlw b'01111000' ; 16 MHz
movwf OSCCON
movlw b'00001000'
movwf PIE1
;; BANK 0
movlb b'00000000'
clrf PIR1
movlw b'11000000'
movwf INTCON
bcf PORTA,FILTER_EN
bsf PORTB,INT
;; -------------------------------------
;; MAINLOOP
main
movlw .255
movwf CNT0
outer1
movlw .255
movwf CNT1
outer
movlw .5
movwf CNT2
inner
decfsz CNT2,f
goto inner
decfsz CNT1,f
goto outer
decfsz CNT0,f
goto outer1
movlw b'00001000'
xorwf PORTB,f
goto main
;; -------------------------------------
;; END
end
|
