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Diffstat (limited to 'drivers/net/hamradio/soundmodem/sm_afsk2666.c')
-rw-r--r--drivers/net/hamradio/soundmodem/sm_afsk2666.c356
1 files changed, 0 insertions, 356 deletions
diff --git a/drivers/net/hamradio/soundmodem/sm_afsk2666.c b/drivers/net/hamradio/soundmodem/sm_afsk2666.c
deleted file mode 100644
index 2aa2972e4..000000000
--- a/drivers/net/hamradio/soundmodem/sm_afsk2666.c
+++ /dev/null
@@ -1,356 +0,0 @@
-/*****************************************************************************/
-
-/*
- * sm_afsk2666.c -- soundcard radio modem driver, 2666 baud AFSK modem
- *
- * Copyright (C) 1997 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 "sm.h"
-#include "sm_tbl_afsk2666.h"
-
-/* --------------------------------------------------------------------- */
-
-struct demod_state_afsk26 {
- unsigned int shreg;
- unsigned long descram;
- int dem_sum[8];
- int dem_sum_mean;
- int dem_cnt;
- unsigned int bit_pll;
- unsigned char last_sample;
- unsigned int dcd_shreg;
- int dcd_sum0, dcd_sum1, dcd_sum2;
- unsigned int dcd_time;
-};
-
-struct mod_state_afsk26 {
- unsigned int shreg;
- unsigned long scram;
- unsigned int bit_pll;
- unsigned int phinc;
- unsigned int tx_seq;
-};
-
-/* --------------------------------------------------------------------- */
-
-#define DESCRAM_TAP1 0x20000
-#define DESCRAM_TAP2 0x01000
-#define DESCRAM_TAP3 0x00001
-
-#define DESCRAM_TAPSH1 17
-#define DESCRAM_TAPSH2 12
-#define DESCRAM_TAPSH3 0
-
-#define SCRAM_TAP1 0x20000 /* X^17 */
-#define SCRAM_TAPN 0x00021 /* X^0+X^5 */
-
-/* --------------------------------------------------------------------- */
-
-static void modulator_2666_u8(struct sm_state *sm, unsigned char *buf, unsigned int buflen)
-{
- struct mod_state_afsk26 *st = (struct mod_state_afsk26 *)(&sm->m);
-
- for (; buflen > 0; buflen--, buf++) {
- if (!st->tx_seq++) {
- if (st->shreg <= 1)
- st->shreg = hdlcdrv_getbits(&sm->hdrv) | 0x10000;
- st->scram = ((st->scram << 1) | (st->scram & 1));
- st->scram ^= (!(st->shreg & 1));
- st->shreg >>= 1;
- if (st->scram & (SCRAM_TAP1 << 1))
- st->scram ^= SCRAM_TAPN << 1;
- st->phinc = afsk26_carfreq[!(st->scram & (SCRAM_TAP1 << 2))];
- }
- if (st->tx_seq >= 6)
- st->tx_seq = 0;
- *buf = OFFSCOS(st->bit_pll);
- st->bit_pll += st->phinc;
- }
-}
-
-/* --------------------------------------------------------------------- */
-
-static void modulator_2666_s16(struct sm_state *sm, short *buf, unsigned int buflen)
-{
- struct mod_state_afsk26 *st = (struct mod_state_afsk26 *)(&sm->m);
-
- for (; buflen > 0; buflen--, buf++) {
- if (!st->tx_seq++) {
- if (st->shreg <= 1)
- st->shreg = hdlcdrv_getbits(&sm->hdrv) | 0x10000;
- st->scram = ((st->scram << 1) | (st->scram & 1));
- st->scram ^= (!(st->shreg & 1));
- st->shreg >>= 1;
- if (st->scram & (SCRAM_TAP1 << 1))
- st->scram ^= SCRAM_TAPN << 1;
- st->phinc = afsk26_carfreq[!(st->scram & (SCRAM_TAP1 << 2))];
- }
- if (st->tx_seq >= 6)
- st->tx_seq = 0;
- *buf = COS(st->bit_pll);
- st->bit_pll += st->phinc;
- }
-}
-
-/* --------------------------------------------------------------------- */
-
-extern __inline__ int convolution12_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]);
-
- return sum;
-}
-
-extern __inline__ int convolution12_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 >>= 8;
- return sum;
-}
-
-/* ---------------------------------------------------------------------- */
-
-#if 0
-static int binexp(unsigned int i)
-{
- int ret = 31;
-
- if (!i)
- return 0;
- if (i < 0x10000LU) {
- i <<= 16;
- ret -= 16;
- }
- if (i < 0x1000000LU) {
- i <<= 8;
- ret -= 8;
- }
- if (i < 0x10000000LU) {
- i <<= 4;
- ret -= 4;
- }
- if (i < 0x40000000LU) {
- i <<= 2;
- ret -= 2;
- }
- if (i < 0x80000000LU)
- ret -= 1;
- return ret;
-}
-
-static const sqrt_tab[16] = {
- 00000, 16384, 23170, 28378, 32768, 36636, 40132, 43348,
- 46341, 49152, 51811, 54340, 56756, 59073, 61303, 63455
-};
-
-
-static unsigned int int_sqrt_approx(unsigned int i)
-{
- unsigned int j;
-
- if (i < 16)
- return sqrt_tab[i] >> 14;
- j = binexp(i) >> 1;
- i >>= (j * 2 - 2);
- return (sqrt_tab[i & 0xf] << j) >> 15;
-}
-#endif
-
-/* --------------------------------------------------------------------- */
-
-extern unsigned int est_pwr(int i, int q)
-{
- unsigned int ui = abs(i);
- unsigned int uq = abs(q);
-
- if (uq > ui) {
- unsigned int tmp;
- tmp = ui;
- ui = uq;
- uq = tmp;
- }
- if (uq > (ui >> 1))
- return 7*(ui>>3) + 9*(uq>>4);
- else
- return ui + (uq>>2);
-}
-
-/* --------------------------------------------------------------------- */
-
-static void demod_one_sample(struct sm_state *sm, struct demod_state_afsk26 *st, int curval,
- int loi, int loq, int hii, int hiq)
-{
- static const int pll_corr[2] = { -0xa00, 0xa00 };
- unsigned char curbit;
- unsigned int descx;
- int val;
-
- /*
- * estimate power
- */
- val = est_pwr(hii, hiq) - est_pwr(loi, loq);
- /*
- * estimate center value
- */
- st->dem_sum[0] += val >> 8;
- if ((++st->dem_cnt) >= 256) {
- st->dem_cnt = 0;
- st->dem_sum_mean = (st->dem_sum[0]+st->dem_sum[1]+
- st->dem_sum[2]+st->dem_sum[3]+
- st->dem_sum[4]+st->dem_sum[5]+
- st->dem_sum[6]+st->dem_sum[7]) >> 3;
- memmove(st->dem_sum+1, st->dem_sum,
- sizeof(st->dem_sum)-sizeof(st->dem_sum[0]));
- st->dem_sum[0] = 0;
- }
- /*
- * decision and bit clock regen
- */
- val -= st->dem_sum_mean;
- diag_add(sm, curval, val);
-
- st->dcd_shreg <<= 1;
- st->bit_pll += 0x1555;
- curbit = (val > 0);
- if (st->last_sample ^ curbit) {
- st->dcd_shreg |= 1;
- st->bit_pll += pll_corr[st->bit_pll < (0x8000+0x1555)];
- st->dcd_sum0 += 4*hweight8(st->dcd_shreg & 0x1e) -
- hweight16(st->dcd_shreg & 0xfe00);
- }
- st->last_sample = curbit;
- hdlcdrv_channelbit(&sm->hdrv, curbit);
- 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 = 400;
- }
- if (st->bit_pll >= 0x10000) {
- st->bit_pll &= 0xffffu;
- st->descram = (st->descram << 1) | curbit;
- descx = st->descram ^ (st->descram >> 1);
- descx ^= ((descx >> DESCRAM_TAPSH1) ^
- (descx >> DESCRAM_TAPSH2));
- st->shreg >>= 1;
- st->shreg |= (!(descx & 1)) << 16;
- if (st->shreg & 1) {
- hdlcdrv_putbits(&sm->hdrv, st->shreg >> 1);
- st->shreg = 0x10000;
- }
- diag_trigger(sm);
- }
-}
-
-/* --------------------------------------------------------------------- */
-
-static void demodulator_2666_u8(struct sm_state *sm, const unsigned char *buf, unsigned int buflen)
-{
- struct demod_state_afsk26 *st = (struct demod_state_afsk26 *)(&sm->d);
-
- for (; buflen > 0; buflen--, buf++) {
- demod_one_sample(sm, st, (*buf-0x80)<<8,
- convolution12_u8(buf, afsk26_dem_tables[0][0].i, AFSK26_DEM_SUM_I_0_0),
- convolution12_u8(buf, afsk26_dem_tables[0][0].q, AFSK26_DEM_SUM_Q_0_0),
- convolution12_u8(buf, afsk26_dem_tables[0][1].i, AFSK26_DEM_SUM_I_0_1),
- convolution12_u8(buf, afsk26_dem_tables[0][1].q, AFSK26_DEM_SUM_Q_0_1));
- demod_one_sample(sm, st, (*buf-0x80)<<8,
- convolution12_u8(buf, afsk26_dem_tables[1][0].i, AFSK26_DEM_SUM_I_1_0),
- convolution12_u8(buf, afsk26_dem_tables[1][0].q, AFSK26_DEM_SUM_Q_1_0),
- convolution12_u8(buf, afsk26_dem_tables[1][1].i, AFSK26_DEM_SUM_I_1_1),
- convolution12_u8(buf, afsk26_dem_tables[1][1].q, AFSK26_DEM_SUM_Q_1_1));
- }
-}
-
-/* --------------------------------------------------------------------- */
-
-static void demodulator_2666_s16(struct sm_state *sm, const short *buf, unsigned int buflen)
-{
- struct demod_state_afsk26 *st = (struct demod_state_afsk26 *)(&sm->d);
-
- for (; buflen > 0; buflen--, buf++) {
- demod_one_sample(sm, st, *buf,
- convolution12_s16(buf, afsk26_dem_tables[0][0].i, AFSK26_DEM_SUM_I_0_0),
- convolution12_s16(buf, afsk26_dem_tables[0][0].q, AFSK26_DEM_SUM_Q_0_0),
- convolution12_s16(buf, afsk26_dem_tables[0][1].i, AFSK26_DEM_SUM_I_0_1),
- convolution12_s16(buf, afsk26_dem_tables[0][1].q, AFSK26_DEM_SUM_Q_0_1));
- demod_one_sample(sm, st, *buf,
- convolution12_s16(buf, afsk26_dem_tables[1][0].i, AFSK26_DEM_SUM_I_1_0),
- convolution12_s16(buf, afsk26_dem_tables[1][0].q, AFSK26_DEM_SUM_Q_1_0),
- convolution12_s16(buf, afsk26_dem_tables[1][1].i, AFSK26_DEM_SUM_I_1_1),
- convolution12_s16(buf, afsk26_dem_tables[1][1].q, AFSK26_DEM_SUM_Q_1_1));
- }
-}
-
-/* --------------------------------------------------------------------- */
-
-static void demod_init_2666(struct sm_state *sm)
-{
- struct demod_state_afsk26 *st = (struct demod_state_afsk26 *)(&sm->d);
-
- st->dcd_time = 400;
- st->dcd_sum0 = 2;
-}
-
-/* --------------------------------------------------------------------- */
-
-const struct modem_tx_info sm_afsk2666_tx = {
- "afsk2666", sizeof(struct mod_state_afsk26), AFSK26_SAMPLERATE, 2666,
- modulator_2666_u8, modulator_2666_s16, NULL
-};
-
-const struct modem_rx_info sm_afsk2666_rx = {
- "afsk2666", sizeof(struct demod_state_afsk26), AFSK26_SAMPLERATE, 2666, 12, 6,
- demodulator_2666_u8, demodulator_2666_s16, demod_init_2666
-};
-
-/* --------------------------------------------------------------------- */
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-18 22:29:43 +0000