FreeCalypso > hg > ice1-trau-tester

annotate ater/tx_func.c @ 19:1e375472d5a5

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ater: implement TRAU frame output
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 24 Jun 2024 08:07:45 +0000
parents 61862af2247f
children 0d70444b5070
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61862af2247f ater: E1 timeslot output (osmo_i460 mux)
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1 /*
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2 * Here we are going to implement Tx on Ater toward the TRAU.
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3 */
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4
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5 #include <stdint.h>
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6 #include <stdbool.h>
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <unistd.h>
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12 #include <osmocom/core/msgb.h>
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13 #include <osmocom/core/select.h>
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14 #include <osmocom/isdn/i460_mux.h>
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16 #include "globals.h"
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17 #include "submux.h"
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19 void init_trau_ul_frame(int nr)
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20 {
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21 struct ater_subslot *at = &subslots[nr];
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22 struct osmo_trau_frame *fr = &at->ul_frame;
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24 fr->type = at->is_efr ? OSMO_TRAU16_FT_EFR : OSMO_TRAU16_FT_FR;
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25 fr->dir = OSMO_TRAU_DIR_UL;
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26 memset(fr->c_bits + 5, 0, 6);
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27 memset(fr->c_bits + 15, 1, 6);
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28 memset(fr->t_bits, 1, 4);
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29 }
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30
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31 static void tx_service_subslot(int nr)
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32 {
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33 struct ater_subslot *at = &subslots[nr];
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34 struct osmo_trau_frame *fr = &at->ul_frame;
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35 struct msgb *msg;
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36 int len;
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37
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38 if (!at->is_active)
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39 return;
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40 at->mfrm_count++;
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41 if (at->mfrm_count >= 24) {
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42 at->mfrm_count = 0;
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43 fr->c_bits[14] = 1;
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44 } else {
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45 fr->c_bits[14] = 0;
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46 }
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47 msg = msgb_alloc_c(g_ctx, 640, "TRAU-UL-frame");
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48 if (!msg)
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49 return;
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50 len = osmo_trau_frame_encode(msg->tail, msgb_tailroom(msg), fr);
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51 msgb_put(msg, len);
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52 osmo_i460_mux_enqueue(at->schan, msg);
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53 }
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54
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55 void transmit_e1_ts(void)
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56 {
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57 uint8_t buf[160];
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58 int nr;
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60 for (nr = 0; nr < ATER_SUBSLOTS; nr++)
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61 tx_service_subslot(nr);
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62 osmo_i460_mux_out(&i460_ts, buf, 160);
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63 write(ts_fd, buf, 160);
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64 }