/*
 * Here we are going to implement Tx on Abis toward the BTS.
 */

#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <osmocom/core/msgb.h>
#include <osmocom/core/select.h>
#include <osmocom/isdn/i460_mux.h>
#include <osmocom/trau/trau_frame.h>

#include "globals.h"
#include "submux.h"
#include "dl_frames.h"

static void tx_service_subslot(int nr)
{
	struct abis_subslot *ab = &subslots[nr];
	const uint8_t *srcbuf;
	struct msgb *msg;
	uint8_t *outbuf;

	if (!ab->got_sync)
		return;
	switch (ab->frame_type) {
	case TRAU_FT_FR_UP:
		srcbuf = dl_frame_fr;
		break;
	case TRAU_FT_EFR:
		srcbuf = dl_frame_efr;
		break;
	default:
		return;
	}
	msg = msgb_alloc_c(g_ctx, DL_OUTPUT_LEN, "TRAU-DL-frame");
	if (!msg)
		return;
	outbuf = msgb_put(msg, DL_OUTPUT_LEN);
	memcpy(outbuf, srcbuf, DL_OUTPUT_LEN);
	osmo_i460_mux_enqueue(ab->schan, msg);
}

void transmit_e1_ts(void)
{
	uint8_t buf[160];
	int nr;

	for (nr = 0; nr < ABIS_SUBSLOTS; nr++)
		tx_service_subslot(nr);
	osmo_i460_mux_out(&i460_ts, buf, 160);
	write(ts_fd, buf, 160);
}