70 lines
3.3 KiB
NASM
70 lines
3.3 KiB
NASM
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;throttle_momentum_lowpass.asm
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.NOLIST
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; ***************************************************************************************
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; * PWM MODEL RAILROAD THROTTLE *
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; * *
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; * WRITTEN BY: PHILIP DEVRIES *
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; * *
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; * Copyright (C) 2003 Philip DeVries *
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; * *
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; * This program is free software; you can redistribute it and/or modify *
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; * it under the terms of the GNU General Public License as published by *
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; * the Free Software Foundation; either version 2 of the License, or *
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; * (at your option) any later version. *
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; * *
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; * This program is distributed in the hope that it will be useful, *
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; * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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; * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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; * GNU General Public License for more details. *
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; * *
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; * You should have received a copy of the GNU General Public License *
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; * along with this program; if not, write to the Free Software *
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; * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
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; * *
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; ***************************************************************************************
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.LIST
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.ifdef MOMENTUM_LOWPASS_ENABLED
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;*****************************************************************
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;* A transversal low pass filter *
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;* *
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;* This is copied from throttle_backemf.asm. *
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;* See the documentation there. *
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;*****************************************************************
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HILOCAL1 _momentum_lo ; assign local variables
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HILOCAL2 _momentum_hi
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mov _momentum_lo,momentum_set
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clr _momentum_hi
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;****
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;* 1. Add in cumulative previous throttle
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;****
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add _momentum_lo,momentum_lo_prev ; Add in scaled previous samples
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adc _momentum_hi,momentum_hi_prev ;
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;****
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;* 2.
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;****
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mov momentum_lo_prev,_momentum_lo ; Store new value
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mov momentum_hi_prev,_momentum_hi ; Store new value
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;****
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;* 3.
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;****
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B_TEMPLOCAL _lowpass_lo_byte
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ldi _lowpass_lo_byte, momentum_lowpass_gain
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rcall DIVIDE_16_SIMPLE
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;****
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;* 4.
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;****
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sub momentum_lo_prev,_momentum_lo
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sbc momentum_hi_prev,_momentum_hi
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mov momentum_set,_momentum_lo
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.endif ;MOMENTUM_LOWPASS_ENABLED
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