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/* Layer 1 Random Access Channel Burst */
/* (C) 2010 by Dieter Spaar <spaar@mirider.augusta.de>
* (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 <osmocore/gsm_utils.h>
#include <osmocore/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/async.h>
#include <layer1/tdma_sched.h>
#include <layer1/tpu_window.h>
#include <layer1/l23_api.h>
#include <l1a_l23_interface.h>
/* p1: type of operation (0: one NB, 1: one RACH burst, 2: four NB */
static int l1s_tx_rach_cmd(__unused uint8_t p1, __unused uint8_t p2, __unused uint16_t p3)
{
int i;
uint16_t *info_ptr;
uint8_t data[2];
putchart('T');
l1s_tx_apc_helper();
data[0] = l1s.serving_cell.bsic << 2;
data[1] = l1s.rach.ra;
info_ptr = &dsp_api.ndb->d_rach;
info_ptr[0] = ((uint16_t)(data[0])) | ((uint16_t)(data[1])<<8);
dsp_api.db_w->d_task_ra = RACH_DSP_TASK;
dsp_end_scenario();
l1s_tx_win_ctrl(l1s.serving_cell.arfcn, L1_TXWIN_AB, 0);
tpu_end_scenario();
return 0;
}
/* p1: type of operation (0: one NB, 1: one RACH burst, 2: four NB */
static int l1s_tx_rach_resp(__unused uint8_t p1, __unused uint8_t burst_id,
__unused uint16_t p3)
{
putchart('t');
dsp_api.r_page_used = 1;
return 0;
}
/* sched sets for uplink */
const struct tdma_sched_item rach_sched_set_ul[] = {
SCHED_ITEM(l1s_tx_rach_cmd, 1, 0), SCHED_END_FRAME(),
SCHED_END_FRAME(),
SCHED_ITEM(l1s_tx_rach_resp, 1, 0), SCHED_END_FRAME(),
SCHED_END_SET()
};
/* request a RACH request at the next multiframe T3 = fn51 */
void l1a_rach_req(uint8_t fn51, uint8_t ra)
{
uint32_t fn_sched;
l1a_lock_sync();
l1s.rach.ra = ra;
/* TODO: can we wrap here? I don't think so */
fn_sched = l1s.current_time.fn - l1s.current_time.t3;
fn_sched += fn51;
sched_gsmtime(rach_sched_set_ul, fn_sched, 0);
l1a_unlock_sync();
}
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