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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
#define DEBUG 1
;; constants
BUF_STARTH EQU H'0020'
BUF_STARTL EQU H'0000'
BUF_ENDH EQU H'0023'
BUF_ENDL EQU H'00BF'
#define FSRW FSR0
#define FSRWH FSR0H
#define FSRWL FSR0L
#define INDFW INDF0
#define FSRR FSR1
#define FSRRH FSR1H
#define FSRRL FSR1L
#define INDFR INDF1
;; I/O Pins
;; PortA
#define C1m PORTA,0
#define C2p PORTA,1
#define AMP_OUT PORTA,2
#define ADC_IN PORTA,3
#define SPEAKER PORTA,4
#define DBG2 PORTA,6
#define DBG1 PORTA,7
;; PortB
#define DBG0 PORTB,0
#define SDI PORTB,1
#define SDO PORTB,2
#define INT PORTB,3
#define SCK PORTB,4
#define CS PORTB,5
#define FILTER_EN PORTB,7
;; variables
;; all Pages
CMD EQU H'0070'
FLAGS EQU H'007F'
;; bits
;; FLAGS
#define UNDERRUN FLAGS,0
#define OVERRUN FLAGS,1
#define CMD_READ FLAGS,7
;; -------------------------------------
;; Macros
inc_fsr MACRO PTR,PTRH,PTRL
LOCAL fsr_wraparound,inc_fsr_end
addfsr PTR,1
movf PTRH,w
sublw BUF_ENDH
btfss STATUS,C
goto fsr_wraparound
btfss STATUS,Z
goto inc_fsr_end
movf PTRL,w
sublw BUF_ENDL
btfsc STATUS,C
goto inc_fsr_end
fsr_wraparound
movlw BUF_STARTH
movwf PTRH
movlw BUF_STARTL
movwf PTRL
inc_fsr_end
ENDM
;; -------------------------------------
;; Reset Vector
org .0
movlb .1
; 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
goto init
;; -------------------------------------
;; Interrupts
org .4
movlb b'00000000'
btfsc PIR1,TMR2IF
goto int_tmr2
btfsc PIR1,SSP1IF
goto int_spi
retfie
;; void timer2Interrupt()
;; {
;; static char value = 0;
;; if (!overrun) {
;; *writePtr = ++value;
;; wbuf_next();
;; }
;; }
int_tmr2
bcf PIR1,TMR2IF
btfsc OVERRUN
goto int_end
movlb b'00000001'
bsf ADCON0,GO
int_tmr2_adcon
btfsc ADCON0,GO
goto int_tmr2_adcon
movf ADRESH,w
movwf INDFW
call wbuf_next
goto int_end
;; void sspInterrupt()
;; {
;; if (cmd_read && spiData == 0) {
;; *readPtr = 0;
;; rbuf_next();
;; spiData = underrun ? -1 : *readPtr;
;; } else if (spiData == 'r') {
;; cmd_read = TRUE;
;; spiData = underrun ? -1 : *readPtr;
;; } else {
;; cmd_read = FALSE;
;; printf("%s\n", "I don't like you!");
;; }
;; }
int_spi
bcf PIR1,SSP1IF
movlb b'00000100'
movf SSP1BUF,w
movwf CMD
btfsc STATUS,Z
goto int_spi_0
movlw 'r'
xorwf CMD,w
btfsc STATUS,Z
goto int_spi_r
;; other commands
goto int_end
int_spi_0
call rbuf_next
movf INDFR,w
btfss UNDERRUN
movwf SSP1BUF
goto int_end
int_spi_r
movf INDFR,w
btfss UNDERRUN
movwf SSP1BUF
bsf CMD_READ
;; goto int_end
int_end
movlb .31
movf FSR0H,w
movwf FSR0H_SHAD
movf FSR0L,w
movwf FSR0L_SHAD
movf FSR1H,w
movwf FSR1H_SHAD
movf FSR1L,w
movwf FSR1L_SHAD
retfie
;; -------------------------------------
;; SUBROUTINES
;; void buf_init()
;; {
;; writePtr = bufferStart;
;; readPtr = bufferStart;
;; overrun = FALSE;
;; underrun = TRUE;
;; cmd_read = FALSE;
;; }
buf_init
movlw BUF_STARTH
movwf FSRWH
movwf FSRRH
movlw BUF_STARTL
movwf FSRWL
movwf FSRRL
bcf OVERRUN
bsf UNDERRUN
bcf CMD_READ
movf BSR,w
clrf BSR
bsf INT
if DEBUG == 1
bcf DBG1
bsf DBG2
endif
movwf BSR
return
;; -------------------
;; void wbuf_next()
;; {
;; if (!overrun) {
;; writePtr++;
;; writePtr = writePtr > bufferEnd ? bufferStart : writePtr;
;; underrun = FALSE;
;; if(writePtr == readPtr) {
;; overrun = TRUE;
;; }
;; }
;; }
wbuf_next
btfsc OVERRUN
return
inc_fsr FSRW,FSRWH,FSRWL
bcf UNDERRUN
movf BSR,w
clrf BSR
bcf INT
if DEBUG == 1
bcf DBG2
endif
movwf BSR
movf FSRRH,w
xorwf FSRWH,w
btfss STATUS,Z
return
movf FSRRL,w
xorwf FSRWL,w
btfss STATUS,Z
return
bsf OVERRUN
if DEBUG == 1
movf BSR,w
clrf BSR
bsf DBG1
movwf BSR
endif
return
;; -------------------
;; void rbuf_next()
;; {
;; if(!underrun) {
;; readPtr++;
;; readPtr = readPtr > bufferEnd ? bufferStart : readPtr;
;; overrun = FALSE;
;; if(readPtr == writePtr) {
;; underrun = TRUE;
;; }
;; }
;; }
rbuf_next
btfsc UNDERRUN
return
inc_fsr FSRR,FSRRH,FSRRL
bcf OVERRUN
if DEBUG == 1
movf BSR,w
clrf BSR
bcf DBG1
movwf BSR
endif
movf FSRWH,w
xorwf FSRRH,w
btfss STATUS,Z
return
movf FSRWL,w
xorwf FSRRL,w
btfss STATUS,Z
return
bsf UNDERRUN
movf BSR,w
clrf BSR
bsf INT
if DEBUG == 1
bsf DBG2
endif
movwf BSR
return
;; -------------------------------------
;; INIT
init
;; BANK 4
movlb b'00000100'
movlw b'01000000'
movwf SSP1STAT
movlw b'00010000'
movwf SSP1CON3
movlw b'00100100'
movwf SSP1CON1
if DEBUG == 1
bsf DBG0 ; Pull-up for DBG0
endif
;; BANK 3
movlb b'00000011'
movlw b'00001111' ; PORTA0:3 analog, PORTA4:7, digital
movwf ANSELA
clrf ANSELB ; PORTB0:7 digital
;; BANK 2
movlb b'00000010'
;; BANK 1
movlb b'00000001'
movlw b'00101111'
movwf TRISA
movlw b'01110010'
movwf TRISB
movlw b'01010000' ; Left Justified, FOSC/16, NEG=VSS,POS=VDD
movwf ADCON1
movlw b'00001101' ; AN3, ADC On
movwf ADCON0
movlw b'00001010' ; SSPIE,TMR2IE
movwf PIE1
;; BANK 0
movlb b'00000000'
movlw .124 ; 8 kHz @ 16MHz
movwf PR2
clrf TMR2 ; reset TMR2
movlw b'00000101' ; Postscaler 1:1,Timer Off,Prescaler 1:4
movwf T2CON
clrf PIR1 ; reset all used interupt flags
movlw b'01000000' ; PEIE
movwf INTCON
bcf FILTER_EN
call buf_init
bsf T2CON,TMR2ON
bsf INTCON,GIE
;; -------------------------------------
;; MAINLOOP
main
goto main
;; -------------------------------------
;; END
end
|
