patch-2.1.27 linux/drivers/net/sm_afsk1200.h

• Lines: 305
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.1.26/linux/drivers/net/sm_afsk1200.h
• Orig date: Sat Dec 21 09:08:38 1996

diff -u --recursive --new-file v2.1.26/linux/drivers/net/sm_afsk1200.h linux/drivers/net/sm_afsk1200.h
@@ -1,304 +0,0 @@
-/*****************************************************************************/
-
-/*
- *	sm_afsk1200.h  -- soundcard radio modem driver, 1200 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.
- *
- */
-
-#include <linux/config.h>
-
-/* --------------------------------------------------------------------- */
-
-struct demod_state_afsk12 {
-	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;
-	union {
-		signed char c[8];
-		float f[8];
-	} filt;
-};
-
-struct mod_state_afsk12 {
-	unsigned int shreg;
-	unsigned char tx_bit;
-	unsigned int bit_pll;
-};
-
-#define DEMOD_STATE ((struct demod_state_afsk12 *)(&sm->d))
-#define MOD_STATE ((struct mod_state_afsk12 *)(&sm->m))
-
-/* --------------------------------------------------------------------- */
-
-static const char sinetab[] = {
-	 128,  140,  152,  164,  176,  187,  198,  208,
-	 217,  226,  233,  240,  245,  249,  252,  254,
-	 255,  254,  252,  249,  245,  240,  233,  226,
-	 217,  208,  198,  187,  176,  164,  152,  140,
-	 128,  116,  104,   92,   80,   69,   58,   48,
-	  39,   30,   23,   16,   11,    7,    4,    2,
-	   1,    2,    4,    7,   11,   16,   23,   30,
-	  39,   48,   58,   69,   80,   92,  104,  116
-};
-
-/* --------------------------------------------------------------------- */
-
-static void modulator_1200(struct sm_state *sm, unsigned char *buf, int buflen)
-{
-	static const int dds_inc[2] = { 8192, 15019 };
-	int j, k;
-
-	for (; buflen >= 8; buflen -= 8) {
-		if (MOD_STATE->shreg <= 1)
-			MOD_STATE->shreg = hdlcdrv_getbits(&sm->hdrv) | 0x10000;
-		MOD_STATE->tx_bit = (MOD_STATE->tx_bit ^ 
-				       (!(MOD_STATE->shreg & 1))) & 1;
-		MOD_STATE->shreg >>= 1;
-		k = dds_inc[MOD_STATE->tx_bit & 1];
-		for (j = 0; j < 8; j++) {
-			*buf++ = sinetab[(MOD_STATE->bit_pll >> 10) & 0x3f];
-			MOD_STATE->bit_pll += k;
-		}
-	}
-}
-
-/* --------------------------------------------------------------------- */
-
-/*
- * should eventually move to an asm header file
- */
-#if defined (CONFIG_SOUNDMODEM__AFSK1200_FP) && (defined(CONFIG_M586) || defined(CONFIG_M686))
-
-#define ENV_STORAGE unsigned char fpu_save[108];
-
-#define ENV_SAVE asm("fsave %0;\n\tfninit;\n\t" : "=m" (*fpu_save) : : "memory");
-#define ENV_RESTORE asm("frstor %0;\n\t" : : "m" (*fpu_save));
-
-static const float tx_lo_i_f[] = { 
-	1.000000, 0.707107, 0.000000, -0.707107, -1.000000, -0.707107, -0.000000, 0.707107 
-};
-
-static const float tx_lo_q_f[] = { 
-	0.000000, 0.707107, 1.000000, 0.707107, 0.000000, -0.707107, -1.000000, -0.707107 
-};
-
-static const float tx_hi_i_f[] = { 
-	1.000000, 0.130526, -0.965926, -0.382683, 0.866025, 0.608761, -0.707107, -0.793353 
-};
-
-static const float tx_hi_q_f[] = { 
-	0.000000, 0.991445, 0.258819, -0.923880, -0.500000, 0.793353, 0.707107, -0.608761 
-};
-
-static inline float convolution8(const float *st, const float *coeff)
-{
-	float f;
-
-	/*
-	 * from Phil Karn, KA9Q's home page
-	 */
-	asm volatile ("flds (%1);\n\t"
-	    "fmuls (%2);\n\t"
-	    "flds 4(%1);\n\t"
-	    "fmuls 4(%2);\n\t"
-	    "flds 8(%1);\n\t"
-	    "fmuls 8(%2);\n\t"
-	    "fxch %%st(2);\n\t"
-	    "faddp;\n\t"
-	    "flds 12(%1);\n\t"
-	    "fmuls 12(%2);\n\t"
-	    "fxch %%st(2);\n\t"
-	    "faddp;\n\t"
-	    "flds 16(%1);\n\t"
-	    "fmuls 16(%2);\n\t"
-	    "fxch %%st(2);\n\t"
-	    "faddp;\n\t"
-	    "flds 20(%1);\n\t"
-	    "fmuls 20(%2);\n\t"
-	    "fxch %%st(2);\n\t"
-	    "faddp;\n\t"
-	    "flds 24(%1);\n\t"
-	    "fmuls 24(%2);\n\t"
-	    "fxch %%st(2);\n\t"
-	    "faddp;\n\t"
-	    "flds 28(%1);\n\t"
-	    "fmuls 28(%2);\n\t"
-	    "fxch %%st(2);\n\t"
-	    "faddp;\n\t"
-	    "faddp;\n\t"
-	    "fmul %%st(0),%%st;\n\t" :
-	    "=t" (f) :
-	    "r" (st),
-	    "r" (coeff) : "memory");
-
-	return f;
-}
-
-static inline int do_filter_1200(struct sm_state *sm, unsigned char newval)
-{
-	float sum;
-
-	memmove(DEMOD_STATE->filt.f+1, DEMOD_STATE->filt.f,
-		sizeof(DEMOD_STATE->filt.f) - sizeof(DEMOD_STATE->filt.f[0]));
-	DEMOD_STATE->filt.f[0] = (((int)newval)-0x80);
-
-	sum = convolution8(DEMOD_STATE->filt.f, tx_lo_i);
-	sum += convolution8(DEMOD_STATE->filt.f, tx_lo_q);
-	sum -= convolution8(DEMOD_STATE->filt.f, tx_hi_i);
-	sum -= convolution8(DEMOD_STATE->filt.f, tx_hi_q);
-	return sum;
-}
-
-#else /* defined (CONFIG_SOUNDMODEM__AFSK1200_FP) && (defined(CONFIG_M586) || defined(CONFIG_M686)) */
-
-#define ENV_STORAGE 
-#define ENV_SAVE
-#define ENV_RESTORE
-
-static const char tx_lo_i[] = { 127, 89, 0, -89, -127, -89, 0, 89 };
-static const char tx_lo_q[] = { 0, 89, 127, 89, 0, -89, -127, -89 };
-static const char tx_hi_i[] = { 127, 16, -122, -48, 109, 77, -89, -100 };
-static const char tx_hi_q[] = { 0, 125, 32, -117, -63, 100, 89, -77 };
-
-static inline void datamove8(signed char *st, unsigned char newval)
-{
-	memmove(st+1, st, 7);
-	*st = newval - 0x80;
-}
-
-static inline int convolution8(const signed char *st, const signed char *coeff)
-{
-	int 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 >>= 7;
-	return sum * sum;
-}
-
-static inline int do_filter_1200(struct sm_state *sm, unsigned char newval)
-{
-	int sum;
-
-	datamove8(DEMOD_STATE->filt.c, newval);
-	
-	sum = convolution8(DEMOD_STATE->filt.c, tx_lo_i);
-	sum += convolution8(DEMOD_STATE->filt.c, tx_lo_q);
-	sum -= convolution8(DEMOD_STATE->filt.c, tx_hi_i);
-	sum -= convolution8(DEMOD_STATE->filt.c, tx_hi_q);
-	return sum;
-}
-
-#endif /* defined (CONFIG_SOUNDMODEM__AFSK1200_FP) && (defined(CONFIG_M586) || defined(CONFIG_M686)) */
-
-
-/* --------------------------------------------------------------------- */
-
-static void demodulator_1200(struct sm_state *sm, unsigned char *buf, int buflen)
-{
-	static const int pll_corr[2] = { -0x1000, 0x1000 };
-	int j;
-	int sum;
-	unsigned char newsample;
-	ENV_STORAGE;
-
-	ENV_SAVE;
-	for (; buflen > 0; buflen--, buf++) {
-		sum = do_filter_1200(sm, *buf);
-		DEMOD_STATE->dcd_shreg <<= 1;
-		DEMOD_STATE->bit_pll += 0x2000;
-		newsample = (sum > 0);
-		if (DEMOD_STATE->last_sample ^ newsample) {
-			DEMOD_STATE->last_sample = newsample;
-			DEMOD_STATE->dcd_shreg |= 1;
-			DEMOD_STATE->bit_pll += pll_corr
-				[DEMOD_STATE->bit_pll < 0x9000];
-			j = 4 * hweight8(DEMOD_STATE->dcd_shreg & 0x38)
-				- hweight16(DEMOD_STATE->dcd_shreg & 0x7c0);
-			DEMOD_STATE->dcd_sum0 += j;
-		}
-		hdlcdrv_channelbit(&sm->hdrv, DEMOD_STATE->last_sample);
-		if ((--DEMOD_STATE->dcd_time) <= 0) {
-			hdlcdrv_setdcd(&sm->hdrv, (DEMOD_STATE->dcd_sum0 + 
-						   DEMOD_STATE->dcd_sum1 + 
-						   DEMOD_STATE->dcd_sum2) < 0);
-			DEMOD_STATE->dcd_sum2 = DEMOD_STATE->dcd_sum1;
-			DEMOD_STATE->dcd_sum1 = DEMOD_STATE->dcd_sum0;
-			DEMOD_STATE->dcd_sum0 = 2; /* slight bias */
-			DEMOD_STATE->dcd_time = 120;
-		}
-		if (DEMOD_STATE->bit_pll >= 0x10000) {
-			DEMOD_STATE->bit_pll &= 0xffff;
-			DEMOD_STATE->shreg >>= 1;
-			DEMOD_STATE->shreg |= (!(DEMOD_STATE->last_rxbit ^
-						 DEMOD_STATE->last_sample)) << 16;
-			DEMOD_STATE->last_rxbit = DEMOD_STATE->last_sample;
-			diag_trigger(sm);
-			if (DEMOD_STATE->shreg & 1) {
-				hdlcdrv_putbits(&sm->hdrv, DEMOD_STATE->shreg >> 1);
-				DEMOD_STATE->shreg = 0x10000;
-			}
-		}
-		diag_add(sm, (((int)*buf)-0x80) << 8, sum);
-	}
-	ENV_RESTORE;
-}
-
-/* --------------------------------------------------------------------- */
-
-static void demod_init_1200(struct sm_state *sm)
-{
-       	DEMOD_STATE->dcd_time = 120;
-	DEMOD_STATE->dcd_sum0 = 2;	
-}
-
-/* --------------------------------------------------------------------- */
-
-static const struct modem_tx_info afsk1200_tx = {
-	NEXT_TX_INFO, "afsk1200", sizeof(struct mod_state_afsk12), 9600, 1200, 8, 
-	modulator_1200, NULL
-};
-#undef NEXT_TX_INFO
-#define NEXT_TX_INFO (&afsk1200_tx)
-
-static const struct modem_rx_info afsk1200_rx = {
-	NEXT_RX_INFO, "afsk1200", sizeof(struct demod_state_afsk12), 9600, 1200, 8, 8, 
-	demodulator_1200, demod_init_1200
-};
-#undef NEXT_RX_INFO
-#define NEXT_RX_INFO (&afsk1200_rx)
-
-/* --------------------------------------------------------------------- */
-
-#undef DEMOD_STATE
-#undef MOD_STATE