patch-2.1.71 linux/drivers/net/soundmodem/sm_afsk2400_8.c

• Lines: 297
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.1.70/linux/drivers/net/soundmodem/sm_afsk2400_8.c
• Orig date: Thu Sep 4 17:07:31 1997

diff -u --recursive --new-file v2.1.70/linux/drivers/net/soundmodem/sm_afsk2400_8.c linux/drivers/net/soundmodem/sm_afsk2400_8.c
@@ -1,296 +0,0 @@
-/*****************************************************************************/
-
-/*
- *	sm_afsk2400_8.c  -- soundcard radio modem driver, 2400 baud AFSK modem
- *
- *	Copyright (C) 1996  Thomas Sailer (sailer@ife.ee.ethz.ch)
- *
- *	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., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- *  Please note that the GPL allows you to use the driver, NOT the radio.
- *  In order to use the radio, you need a license from the communications
- *  authority of your country.
- *
- */
-
-/*
- * This driver is intended to be compatible with TCM3105 modems
- * overclocked to 8MHz. The mark and space frequencies therefore
- * lie at 3970 and 2165 Hz.
- * Note that I do _not_ recommend the building of such links, I provide
- * this only for the users who live in the coverage area of such
- * a "legacy" link.
- */
-
-#include "sm.h"
-#include "sm_tbl_afsk2400_8.h"
-
-/* --------------------------------------------------------------------- */
-
-struct demod_state_afsk24 {
-	unsigned int shreg;
-	unsigned int bit_pll;
-	unsigned char last_sample;
-	unsigned int dcd_shreg;
-	int dcd_sum0, dcd_sum1, dcd_sum2;
-	unsigned int dcd_time;
-	unsigned char last_rxbit;
-};
-
-struct mod_state_afsk24 {
-	unsigned int shreg;
-	unsigned char tx_bit;
-	unsigned int bit_pll;
-	unsigned int tx_seq;
-	unsigned int phinc;
-};
-
-/* --------------------------------------------------------------------- */
-
-static const int dds_inc[2] = { AFSK24_TX_FREQ_LO*0x10000/AFSK24_SAMPLERATE,
-				AFSK24_TX_FREQ_HI*0x10000/AFSK24_SAMPLERATE };
-
-static void modulator_2400_u8(struct sm_state *sm, unsigned char *buf, unsigned int buflen)
-{
-	struct mod_state_afsk24 *st = (struct mod_state_afsk24 *)(&sm->m);
-
-	for (; buflen > 0; buflen--, buf++) {
-		if (st->tx_seq < 0x5555) {
-			if (st->shreg <= 1)
-				st->shreg = hdlcdrv_getbits(&sm->hdrv) | 0x10000;
-			st->tx_bit = (st->tx_bit ^ (!(st->shreg & 1))) & 1;
-			st->shreg >>= 1;
-			st->phinc = dds_inc[st->tx_bit & 1];
-		}
-		st->tx_seq += 0x5555;
-		st->tx_seq &= 0xffff;
-		*buf = OFFSCOS(st->bit_pll);
-		st->bit_pll += st->phinc;
-	}
-}
-
-/* --------------------------------------------------------------------- */
-
-static void modulator_2400_s16(struct sm_state *sm, short *buf, unsigned int buflen)
-{
-	struct mod_state_afsk24 *st = (struct mod_state_afsk24 *)(&sm->m);
-
-	for (; buflen > 0; buflen--, buf++) {
-		if (st->tx_seq < 0x5555) {
-			if (st->shreg <= 1)
-				st->shreg = hdlcdrv_getbits(&sm->hdrv) | 0x10000;
-			st->tx_bit = (st->tx_bit ^ (!(st->shreg & 1))) & 1;
-			st->shreg >>= 1;
-			st->phinc = dds_inc[st->tx_bit & 1];
-		}
-		st->tx_seq += 0x5555;
-		st->tx_seq &= 0xffff;
-		*buf = COS(st->bit_pll);
-		st->bit_pll += st->phinc;
-	}
-}
-
-/* --------------------------------------------------------------------- */
-
-extern __inline__ int convolution14_u8(const unsigned char *st, const int *coeff, int csum)
-{
-	int sum = -0x80 * csum;
-	
-	sum += (st[0] * coeff[0]);
-	sum += (st[-1] * coeff[1]);
-	sum += (st[-2] * coeff[2]);
-	sum += (st[-3] * coeff[3]);
-	sum += (st[-4] * coeff[4]);
-	sum += (st[-5] * coeff[5]);
-	sum += (st[-6] * coeff[6]);
-	sum += (st[-7] * coeff[7]);
-	sum += (st[-8] * coeff[8]);
-	sum += (st[-9] * coeff[9]);
-	sum += (st[-10] * coeff[10]);
-	sum += (st[-11] * coeff[11]);
-	sum += (st[-12] * coeff[12]);
-	sum += (st[-13] * coeff[13]);
-
-	sum >>= 7;
-	return sum * sum;
-}
-
-extern __inline__ int convolution14_s16(const short *st, const int *coeff, int csum)
-{
-	int sum = 0;
-	
-	sum += (st[0] * coeff[0]);
-	sum += (st[-1] * coeff[1]);
-	sum += (st[-2] * coeff[2]);
-	sum += (st[-3] * coeff[3]);
-	sum += (st[-4] * coeff[4]);
-	sum += (st[-5] * coeff[5]);
-	sum += (st[-6] * coeff[6]);
-	sum += (st[-7] * coeff[7]);
-	sum += (st[-8] * coeff[8]);
-	sum += (st[-9] * coeff[9]);
-	sum += (st[-10] * coeff[10]);
-	sum += (st[-11] * coeff[11]);
-	sum += (st[-12] * coeff[12]);
-	sum += (st[-13] * coeff[13]);
-
-	sum >>= 15;
-	return sum * sum;
-}
-
-extern __inline__ int do_filter_2400_u8(const unsigned char *buf)
-{
-	int sum = convolution14_u8(buf, afsk24_tx_lo_i, SUM_AFSK24_TX_LO_I);
-	sum += convolution14_u8(buf, afsk24_tx_lo_q, SUM_AFSK24_TX_LO_Q);
-	sum -= convolution14_u8(buf, afsk24_tx_hi_i, SUM_AFSK24_TX_HI_I);
-	sum -= convolution14_u8(buf, afsk24_tx_hi_q, SUM_AFSK24_TX_HI_Q);
-	return sum;
-}
-
-extern __inline__ int do_filter_2400_s16(const short *buf)
-{
-	int sum = convolution14_s16(buf, afsk24_tx_lo_i, SUM_AFSK24_TX_LO_I);
-	sum += convolution14_s16(buf, afsk24_tx_lo_q, SUM_AFSK24_TX_LO_Q);
-	sum -= convolution14_s16(buf, afsk24_tx_hi_i, SUM_AFSK24_TX_HI_I);
-	sum -= convolution14_s16(buf, afsk24_tx_hi_q, SUM_AFSK24_TX_HI_Q);
-	return sum;
-}
-
-/* --------------------------------------------------------------------- */
-
-static void demodulator_2400_u8(struct sm_state *sm, const unsigned char *buf, unsigned int buflen)
-{
-	struct demod_state_afsk24 *st = (struct demod_state_afsk24 *)(&sm->d);
-	int j;
-	int sum;
-	unsigned char newsample;
-
-	for (; buflen > 0; buflen--, buf++) {
-		sum = do_filter_2400_u8(buf);
-		st->dcd_shreg <<= 1;
-		st->bit_pll += AFSK24_BITPLL_INC;
-		newsample = (sum > 0);
-		if (st->last_sample ^ newsample) {
-			st->last_sample = newsample;
-			st->dcd_shreg |= 1;
-			if (st->bit_pll < (0x8000+AFSK24_BITPLL_INC/2))
-				st->bit_pll += AFSK24_BITPLL_INC/2;
-			else
-				st->bit_pll -= AFSK24_BITPLL_INC/2;
-			j = /* 2 * */ hweight8(st->dcd_shreg & 0x1c)
-				- hweight16(st->dcd_shreg & 0x1e0);
-			st->dcd_sum0 += j;
-		}
-		hdlcdrv_channelbit(&sm->hdrv, st->last_sample);
-		if ((--st->dcd_time) <= 0) {
-			hdlcdrv_setdcd(&sm->hdrv, (st->dcd_sum0 + 
-						   st->dcd_sum1 + 
-						   st->dcd_sum2) < 0);
-			st->dcd_sum2 = st->dcd_sum1;
-			st->dcd_sum1 = st->dcd_sum0;
-			st->dcd_sum0 = 2; /* slight bias */
-			st->dcd_time = 120;
-		}
-		if (st->bit_pll >= 0x10000) {
-			st->bit_pll &= 0xffff;
-			st->shreg >>= 1;
-			st->shreg |= (!(st->last_rxbit ^
-					st->last_sample)) << 16;
-			st->last_rxbit = st->last_sample;
-			diag_trigger(sm);
-			if (st->shreg & 1) {
-				hdlcdrv_putbits(&sm->hdrv, st->shreg >> 1);
-				st->shreg = 0x10000;
-			}
-		}
-		diag_add(sm, (((int)*buf)-0x80) << 8, sum);
-	}
-}
-
-/* --------------------------------------------------------------------- */
-
-static void demodulator_2400_s16(struct sm_state *sm, const short *buf, unsigned int buflen)
-{
-	struct demod_state_afsk24 *st = (struct demod_state_afsk24 *)(&sm->d);
-	int j;
-	int sum;
-	unsigned char newsample;
-
-	for (; buflen > 0; buflen--, buf++) {
-		sum = do_filter_2400_s16(buf);
-		st->dcd_shreg <<= 1;
-		st->bit_pll += AFSK24_BITPLL_INC;
-		newsample = (sum > 0);
-		if (st->last_sample ^ newsample) {
-			st->last_sample = newsample;
-			st->dcd_shreg |= 1;
-			if (st->bit_pll < (0x8000+AFSK24_BITPLL_INC/2))
-				st->bit_pll += AFSK24_BITPLL_INC/2;
-			else
-				st->bit_pll -= AFSK24_BITPLL_INC/2;
-			j = /* 2 * */ hweight8(st->dcd_shreg & 0x1c)
-				- hweight16(st->dcd_shreg & 0x1e0);
-			st->dcd_sum0 += j;
-		}
-		hdlcdrv_channelbit(&sm->hdrv, st->last_sample);
-		if ((--st->dcd_time) <= 0) {
-			hdlcdrv_setdcd(&sm->hdrv, (st->dcd_sum0 + 
-						   st->dcd_sum1 + 
-						   st->dcd_sum2) < 0);
-			st->dcd_sum2 = st->dcd_sum1;
-			st->dcd_sum1 = st->dcd_sum0;
-			st->dcd_sum0 = 2; /* slight bias */
-			st->dcd_time = 120;
-		}
-		if (st->bit_pll >= 0x10000) {
-			st->bit_pll &= 0xffff;
-			st->shreg >>= 1;
-			st->shreg |= (!(st->last_rxbit ^
-					st->last_sample)) << 16;
-			st->last_rxbit = st->last_sample;
-			diag_trigger(sm);
-			if (st->shreg & 1) {
-				hdlcdrv_putbits(&sm->hdrv, st->shreg >> 1);
-				st->shreg = 0x10000;
-			}
-		}
-		diag_add(sm, *buf, sum);
-	}
-}
-
-/* --------------------------------------------------------------------- */
-
-static void demod_init_2400(struct sm_state *sm)
-{
-	struct demod_state_afsk24 *st = (struct demod_state_afsk24 *)(&sm->d);
-
-       	st->dcd_time = 120;
-	st->dcd_sum0 = 2;
-}
-
-/* --------------------------------------------------------------------- */
-
-const struct modem_tx_info sm_afsk2400_8_tx = {
-	"afsk2400_8", sizeof(struct mod_state_afsk24), AFSK24_SAMPLERATE, 2400, 
-	modulator_2400_u8, modulator_2400_s16, NULL
-};
-
-const struct modem_rx_info sm_afsk2400_8_rx = {
-	"afsk2400_8", sizeof(struct demod_state_afsk24), 
-	AFSK24_SAMPLERATE, 2400, 14, AFSK24_SAMPLERATE/2400, 
-	demodulator_2400_u8, demodulator_2400_s16, demod_init_2400
-};
-
-/* --------------------------------------------------------------------- */