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/* OCXO calibration control for Litecell 1.5 BTS management daemon */
/* Copyright (C) 2015 by Yves Godin <support@nuranwireless.com>
*
* Based on sysmoBTS:
* sysmobts_mgr_calib.c
* (C) 2014,2015 by Holger Hans Peter Freyther
* (C) 2014 by Harald Welte for the IPA code from the oml router
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "misc/lc15bts_mgr.h"
#include "misc/lc15bts_misc.h"
#include "misc/lc15bts_clock.h"
#include "osmo-bts/msg_utils.h"
#include <osmocom/core/logging.h>
#include <osmocom/core/select.h>
#include <osmocom/ctrl/control_cmd.h>
#include <osmocom/gsm/ipa.h>
#include <osmocom/gsm/protocol/ipaccess.h>
#include <osmocom/abis/abis.h>
#include <osmocom/abis/e1_input.h>
#include <osmocom/abis/ipa.h>
static void calib_adjust(struct lc15bts_mgr_instance *mgr);
static void calib_state_reset(struct lc15bts_mgr_instance *mgr, int reason);
static void calib_loop_run(void *_data);
enum calib_state {
CALIB_INITIAL,
CALIB_IN_PROGRESS,
};
enum calib_result {
CALIB_FAIL_START,
CALIB_FAIL_GPSFIX,
CALIB_FAIL_CLKERR,
CALIB_FAIL_OCXODAC,
CALIB_SUCCESS,
};
static void calib_start(struct lc15bts_mgr_instance *mgr)
{
int rc;
rc = lc15bts_clock_err_open();
if (rc != 0) {
LOGP(DCALIB, LOGL_ERROR, "Failed to open clock error module %d\n", rc);
calib_state_reset(mgr, CALIB_FAIL_CLKERR);
return;
}
rc = lc15bts_clock_dac_open();
if (rc != 0) {
LOGP(DCALIB, LOGL_ERROR, "Failed to open OCXO dac module %d\n", rc);
calib_state_reset(mgr, CALIB_FAIL_OCXODAC);
return;
}
calib_adjust(mgr);
}
static void calib_adjust(struct lc15bts_mgr_instance *mgr)
{
int rc;
int fault;
int error_ppt;
int accuracy_ppq;
int interval_sec;
int dac_value;
int new_dac_value;
double dac_correction;
rc = lc15bts_clock_err_get(&fault, &error_ppt,
&accuracy_ppq, &interval_sec);
if (rc < 0) {
LOGP(DCALIB, LOGL_ERROR,
"Failed to get clock error measurement %d\n", rc);
calib_state_reset(mgr, CALIB_FAIL_CLKERR);
return;
}
if (fault) {
LOGP(DCALIB, LOGL_NOTICE, "GPS has no fix\n");
calib_state_reset(mgr, CALIB_FAIL_GPSFIX);
return;
}
rc = lc15bts_clock_dac_get(&dac_value);
if (rc < 0) {
LOGP(DCALIB, LOGL_ERROR,
"Failed to get OCXO dac value %d\n", rc);
calib_state_reset(mgr, CALIB_FAIL_OCXODAC);
return;
}
LOGP(DCALIB, LOGL_NOTICE,
"Calibration ERR(%f PPB) ACC(%f PPB) INT(%d) DAC(%d)\n",
error_ppt / 1000., accuracy_ppq / 1000000., interval_sec, dac_value);
/* 1 unit of correction equal about 0.5 - 1 PPB correction */
dac_correction = (int)(-error_ppt * 0.00056);
new_dac_value = dac_value + dac_correction + 0.5;
/* We have a fix, make sure the measured error is
meaningful (10 times the accuracy) */
if ((new_dac_value != dac_value) && ((100l * abs(error_ppt)) > accuracy_ppq)) {
if (new_dac_value > 4095)
dac_value = 4095;
else if (new_dac_value < 0)
dac_value = 0;
else
dac_value = new_dac_value;
LOGP(DCALIB, LOGL_NOTICE,
"Going to apply %d as new clock setting.\n",
dac_value);
rc = lc15bts_clock_dac_set(dac_value);
if (rc < 0) {
LOGP(DCALIB, LOGL_ERROR,
"Failed to set OCXO dac value %d\n", rc);
calib_state_reset(mgr, CALIB_FAIL_OCXODAC);
return;
}
rc = lc15bts_clock_err_reset();
if (rc < 0) {
LOGP(DCALIB, LOGL_ERROR,
"Failed to set reset clock error module %d\n", rc);
calib_state_reset(mgr, CALIB_FAIL_CLKERR);
return;
}
}
/* Save the correction value in the DAC eeprom if the
frequency has been stable for 24 hours */
else if (interval_sec >= (24 * 60 * 60)) {
rc = lc15bts_clock_dac_save();
if (rc < 0) {
LOGP(DCALIB, LOGL_ERROR,
"Failed to save OCXO dac value %d\n", rc);
calib_state_reset(mgr, CALIB_FAIL_OCXODAC);
}
rc = lc15bts_clock_err_reset();
if (rc < 0) {
LOGP(DCALIB, LOGL_ERROR,
"Failed to set reste clock error module %d\n", rc);
calib_state_reset(mgr, CALIB_FAIL_CLKERR);
}
}
calib_state_reset(mgr, CALIB_SUCCESS);
return;
}
static void calib_close(struct lc15bts_mgr_instance *mgr)
{
lc15bts_clock_err_close();
lc15bts_clock_dac_close();
}
static void calib_state_reset(struct lc15bts_mgr_instance *mgr, int outcome)
{
if (mgr->calib.calib_from_loop) {
/*
* In case of success calibrate in two hours again
* and in case of a failure in some minutes.
*
* TODO NTQ: Select timeout based on last error and accuracy
*/
int timeout = 60;
//int timeout = 2 * 60 * 60;
//if (outcome != CALIB_SUCESS) }
// timeout = 5 * 60;
//}
mgr->calib.calib_timeout.data = mgr;
mgr->calib.calib_timeout.cb = calib_loop_run;
osmo_timer_schedule(&mgr->calib.calib_timeout, timeout, 0);
}
mgr->calib.state = CALIB_INITIAL;
calib_close(mgr);
}
static int calib_run(struct lc15bts_mgr_instance *mgr, int from_loop)
{
if (mgr->calib.state != CALIB_INITIAL) {
LOGP(DCALIB, LOGL_ERROR, "Calib is already in progress.\n");
return -1;
}
mgr->calib.calib_from_loop = from_loop;
/* From now on everything will be handled from the failure */
mgr->calib.state = CALIB_IN_PROGRESS;
calib_start(mgr);
return 0;
}
static void calib_loop_run(void *_data)
{
int rc;
struct lc15bts_mgr_instance *mgr = _data;
LOGP(DCALIB, LOGL_NOTICE, "Going to calibrate the system.\n");
rc = calib_run(mgr, 1);
if (rc != 0) {
calib_state_reset(mgr, CALIB_FAIL_START);
}
}
int lc15bts_mgr_calib_run(struct lc15bts_mgr_instance *mgr)
{
return calib_run(mgr, 0);
}
int lc15bts_mgr_calib_init(struct lc15bts_mgr_instance *mgr)
{
mgr->calib.state = CALIB_INITIAL;
mgr->calib.calib_timeout.data = mgr;
mgr->calib.calib_timeout.cb = calib_loop_run;
osmo_timer_schedule(&mgr->calib.calib_timeout, 0, 0);
return 0;
}
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