70 lines
3.2 KiB
NASM
70 lines
3.2 KiB
NASM
|
;throttle_set_lowpass.asm
|
||
|
|
|
||
|
|
.NOLIST
|
||
|
|
|
||
|
|
; ***************************************************************************************
|
||
|
|
; * PWM MODEL RAILROAD THROTTLE *
|
||
|
|
; * *
|
||
|
|
; * WRITTEN BY: PHILIP DEVRIES *
|
||
|
|
; * *
|
||
|
|
; * Copyright (C) 2003 Philip DeVries *
|
||
|
|
; * *
|
||
|
|
; * This program 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 2 of the License, or *
|
||
|
|
; * (at your option) any later version. *
|
||
|
|
; * *
|
||
|
|
; * This program 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 this program; if not, write to the Free Software *
|
||
|
|
; * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
|
||
|
|
; * *
|
||
|
|
; ***************************************************************************************
|
||
|
|
.LIST
|
||
|
|
|
||
|
|
.ifdef THROTTLE_LOWPASS_ENABLED
|
||
|
|
;*****************************************************************
|
||
|
|
;* A transversal low pass filter *
|
||
|
|
;* *
|
||
|
|
;* This is copied from throttle_backemf.asm. *
|
||
|
|
;* See the documentation there. *
|
||
|
|
;*****************************************************************
|
||
|
|
HILOCAL1 throttle_lo ; assign local variables
|
||
|
|
HILOCAL2 throttle_hi
|
||
|
|
|
||
|
|
mov throttle_lo,throttle_set
|
||
|
|
clr throttle_hi
|
||
|
|
|
||
|
|
;****
|
||
|
|
;* 1. Add in cumulative previous throttle
|
||
|
|
;****
|
||
|
|
add throttle_lo,throttle_lo_prev ; Add in scaled previous samples
|
||
|
|
adc throttle_hi,throttle_hi_prev ;
|
||
|
|
|
||
|
|
;****
|
||
|
|
;* 2.
|
||
|
|
;****
|
||
|
|
mov throttle_lo_prev,throttle_lo ; Store new value
|
||
|
|
mov throttle_hi_prev,throttle_hi ; Store new value
|
||
|
|
|
||
|
|
;****
|
||
|
|
;* 3.
|
||
|
|
;****
|
||
|
|
|
||
|
|
B_TEMPLOCAL _lowpass_lo_byte
|
||
|
|
ldi _lowpass_lo_byte, throttle_lowpass_gain
|
||
|
|
rcall DIVIDE_16_SIMPLE
|
||
|
|
|
||
|
|
;****
|
||
|
|
;* 4.
|
||
|
|
;****
|
||
|
|
sub throttle_lo_prev,throttle_lo
|
||
|
|
sbc throttle_hi_prev,throttle_hi
|
||
|
|
|
||
|
|
mov throttle_set,throttle_lo
|
||
|
|
.endif ;THROTTLE_LOWPASS_FILTER
|