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/* Layer 1 - Receiving Normal Bursts */
/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <defines.h>
#include <debug.h>
#include <memory.h>
#include <byteorder.h>
#include <rffe.h>
#include <osmocom/gsm/gsm_utils.h>
#include <osmocom/core/msgb.h>
#include <calypso/dsp_api.h>
#include <calypso/irq.h>
#include <calypso/tpu.h>
#include <calypso/tsp.h>
#include <calypso/dsp.h>
#include <calypso/timer.h>
#include <comm/sercomm.h>
#include <layer1/sync.h>
#include <layer1/afc.h>
#include <layer1/toa.h>
#include <layer1/tdma_sched.h>
#include <layer1/mframe_sched.h>
#include <layer1/tpu_window.h>
#include <layer1/l23_api.h>
#include <layer1/rfch.h>
#include <layer1/prim.h>
#include <layer1/agc.h>
#include <l1ctl_proto.h>
/* ------------------------------------------------------------------------ */
/* DSP extensions API */
/* ------------------------------------------------------------------------ */
#define BASE_API 0xFFD00000
#define API_DSP2ARM(x) (BASE_API + ((x) - 0x0800) * sizeof(uint16_t))
#define BASE_API_EXT_DB0 API_DSP2ARM(0x2000)
#define BASE_API_EXT_DB1 API_DSP2ARM(0x2200)
#define BASE_API_EXT_NDB API_DSP2ARM(0x2400)
struct dsp_ext_ndb {
uint16_t active;
uint16_t tsc;
} __attribute__((packed));
struct dsp_ext_db {
/* TX command and data ptr */
struct {
#define DSP_EXT_TX_CMD_NONE 0
#define DSP_EXT_TX_CMD_FB 1
#define DSP_EXT_TX_CMD_SB 2
#define DSP_EXT_TX_CMD_DUMMY 3
#define DSP_EXT_TX_CMD_AB 4
#define DSP_EXT_TX_CMD_NB 5
uint16_t cmd;
uint16_t data;
} tx[8];
/* RX command and data ptr */
struct {
#define DSP_EXT_RX_CMD_NONE 0
#define DSP_EXT_RX_CMD_AB 1
#define DSP_EXT_RX_CMD_NB 2
uint16_t cmd;
uint16_t data;
} rx[8];
/* SCH data */
uint16_t sch[2];
/* Generic data array */
uint16_t data[0];
} __attribute__((packed));
struct dsp_ext_api {
struct dsp_ext_ndb *ndb;
struct dsp_ext_db *db[2];
};
static struct dsp_ext_api dsp_ext_api = {
.ndb = (struct dsp_ext_ndb *) BASE_API_EXT_NDB,
.db = {
(struct dsp_ext_db *) BASE_API_EXT_DB0,
(struct dsp_ext_db *) BASE_API_EXT_DB1,
},
};
static inline struct dsp_ext_db *
dsp_ext_get_db(int r_wn /* 0=W, 1=R */)
{
int idx = r_wn ? dsp_api.r_page : dsp_api.w_page;
return dsp_ext_api.db[idx];
}
struct l1s_rxnb_state {
struct l1s_meas_hdr meas[4];
struct msgb *msg;
struct l1ctl_info_dl *dl;
struct l1ctl_data_ind *di;
};
static struct l1s_rxnb_state rxnb;
static int l1s_nb_resp(__unused uint8_t p1, __unused uint8_t p2, uint16_t p3)
{
struct gsm_time rx_time;
uint16_t rf_arfcn;
uint8_t tsc, tn;
int i;
#if 1
putchart('n');
/* just for debugging, d_task_d should not be 0 */
if (dsp_api.db_r->d_task_d == 0) {
puts("EMPTY\n");
return 0;
}
/* DSP burst ID needs to correspond with what we expect */
if (dsp_api.db_r->d_burst_d != 0) {
printf("BURST ID %u!=0\n", dsp_api.db_r->d_burst_d);
return 0;
}
/* get radio parameters for _this_ burst */
gsm_fn2gsmtime(&rx_time, l1s.current_time.fn - 1);
rfch_get_params(&rx_time, &rf_arfcn, &tsc, &tn);
/* collect measurements */
rxnb.meas[0].toa_qbit = dsp_api.db_r->a_serv_demod[D_TOA];
rxnb.meas[0].pm_dbm8 =
agc_inp_dbm8_by_pm(dsp_api.db_r->a_serv_demod[D_PM] >> 3);
rxnb.meas[0].freq_err =
ANGLE_TO_FREQ(dsp_api.db_r->a_serv_demod[D_ANGLE]);
rxnb.meas[0].snr = dsp_api.db_r->a_serv_demod[D_SNR];
/* feed computed frequency error into AFC loop */
if (rxnb.meas[0].snr > AFC_SNR_THRESHOLD)
afc_input(rxnb.meas[0].freq_err, rf_arfcn, 1);
else
afc_input(rxnb.meas[0].freq_err, rf_arfcn, 0);
/* feed computed TOA into TA loop */
printf("TOA=%d snr=%d (thres %d) freq_err=%d pm=%d\n",
rxnb.meas[0].toa_qbit, rxnb.meas[0].snr, 2560,
rxnb.meas[0].freq_err, rxnb.meas[0].pm_dbm8 / 8);
for (i = 0; i < 10; i++)
toa_input(rxnb.meas[0].toa_qbit << 2, rxnb.meas[0].snr);
/* Tell the RF frontend to set the gain appropriately */
rffe_compute_gain(rxnb.meas[0].pm_dbm8/8, CAL_DSP_TGT_BB_LVL);
{
/* Get radio parameters for the first burst */
gsm_fn2gsmtime(&rx_time, l1s.current_time.fn - 4);
rfch_get_params(&rx_time, &rf_arfcn, &tsc, &tn);
rxnb.dl->chan_nr = 0x80;
rxnb.dl->link_id = 0x00;
rxnb.dl->band_arfcn = htons(rf_arfcn);
rxnb.dl->frame_nr = htonl(rx_time.fn);
rxnb.dl->snr = rxnb.meas[0].snr;
rxnb.dl->rx_level = dbm2rxlev(rxnb.meas[0].pm_dbm8 / 8);
/* update rx level for pm report */
pu_update_rx_level(rxnb.dl->rx_level);
l1_queue_for_l2(rxnb.msg);
rxnb.msg = NULL; rxnb.dl = NULL; rxnb.di = NULL;
/* clear downlink task */
dsp_api.db_w->d_task_d = 0;
}
/* mark READ page as being used */
dsp_api.r_page_used = 1;
#else
struct dsp_ext_db *db = dsp_ext_get_db(1);
uint16_t *d = &db->data[32];
/* get radio parameters for _this_ burst */
gsm_fn2gsmtime(&rx_time, l1s.current_time.fn - 1);
rfch_get_params(&rx_time, &rf_arfcn, &tsc, &tn);
/* collect measurements */
rxnb.meas[0].toa_qbit = d[D_TOA];
rxnb.meas[0].pm_dbm8 =
agc_inp_dbm8_by_pm(d[D_PM] >> 3);
rxnb.meas[0].freq_err =
ANGLE_TO_FREQ(d[D_ANGLE]);
rxnb.meas[0].snr = d[D_SNR];
/* feed computed frequency error into AFC loop */
if (rxnb.meas[0].snr > AFC_SNR_THRESHOLD)
afc_input(rxnb.meas[0].freq_err, rf_arfcn, 1);
else
afc_input(rxnb.meas[0].freq_err, rf_arfcn, 0);
/* feed computed TOA into TA loop */
printf("arfcn=%d tn=%d TOA=%d snr=%d (thres %d) freq_err=%d pm=%d\n",
rf_arfcn, tn,
rxnb.meas[0].toa_qbit, rxnb.meas[0].snr, 2560,
rxnb.meas[0].freq_err, rxnb.meas[0].pm_dbm8 / 8);
for (i = 0; i < 10; i++)
toa_input(rxnb.meas[0].toa_qbit << 2, rxnb.meas[0].snr);
/* Tell the RF frontend to set the gain appropriately */
rffe_compute_gain(rxnb.meas[0].pm_dbm8/8, CAL_DSP_TGT_BB_LVL);
{
rxnb.dl->chan_nr = 0x80;
rxnb.dl->link_id = 0x00;
rxnb.dl->band_arfcn = htons(rf_arfcn);
rxnb.dl->frame_nr = htonl(rx_time.fn);
rxnb.dl->snr = rxnb.meas[0].snr;
rxnb.dl->rx_level = dbm2rxlev(rxnb.meas[0].pm_dbm8 / 8);
/* update rx level for pm report */
pu_update_rx_level(rxnb.dl->rx_level);
l1_queue_for_l2(rxnb.msg);
rxnb.msg = NULL; rxnb.dl = NULL; rxnb.di = NULL;
}
/* We're done with this */
dsp_api.r_page_used = 1;
#endif
return 0;
}
static int l1s_nb_cmd(__unused uint8_t p1, __unused uint8_t p2,
__unused uint16_t p3)
{
uint16_t arfcn;
uint8_t tsc, tn;
putchart('N');
if (rxnb.msg) {
/* Can happen when resetting ... */
printf("nb_cmd(0) and rxnb.msg != NULL\n");
msgb_free(rxnb.msg);
}
/* allocate msgb as needed. FIXME: from L1A ?? */
rxnb.msg = l1ctl_msgb_alloc(L1CTL_DATA_IND);
if (!rxnb.msg)
printf("nb_cmd(0): unable to allocate msgb\n");
rxnb.dl = (struct l1ctl_info_dl *) msgb_put(rxnb.msg, sizeof(*rxnb.dl));
rxnb.di = (struct l1ctl_data_ind *) msgb_put(rxnb.msg, sizeof(*rxnb.di));
rfch_get_params(&l1s.next_time, &arfcn, &tsc, &tn);
dsp_ext_api.ndb->tsc = tsc;
#if 1
/* DDL_DSP_TASK, four normal bursts */
dsp_load_tch_param(&l1s.next_time,
SIG_ONLY_MODE, SDCCH_4, 0, 0, 0, tn);
dsp_load_rx_task( dsp_task_iq_swap(ALLC_DSP_TASK, arfcn, 0), 0, tsc);
#else
struct dsp_ext_db *db = dsp_ext_get_db(0);
/* Enable extensions */
dsp_ext_api.ndb->active = 1;
db->rx[0].data = 0x000;
db->rx[0].cmd = DSP_EXT_RX_CMD_NB;
/* Enable dummy bursts detection */
dsp_api.db_w->d_ctrl_system |= (1 << B_BCCH_FREQ_IND);
/* Enable task */
dsp_api.db_w->d_task_d = 23;
#endif
l1s_rx_win_ctrl(arfcn, L1_RXWIN_NB, 0);
return 0;
}
const struct tdma_sched_item bts_sync_sched_set[] = {
SCHED_ITEM_DT(l1s_nb_cmd, 2, 0, 0), SCHED_END_FRAME(),
SCHED_END_FRAME(),
SCHED_ITEM(l1s_nb_resp, -5, 0, 0), SCHED_END_FRAME(),
SCHED_END_SET()
};
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