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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,7
bcf PORTB,3
;; -------------------------------------
;; MAINLOOP
main
;; movlw .255
;; movwf CNT0
;; outer1
;; movlw .255
;; movwf CNT1
;; outer
;; movlw .20
;; 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
|
