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annotate trau-decode/osmo_bits.h @ 94:f9ef582c199c

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tfo-ut: check in tfo-fr.bin and tfo-efr.bin Each of these binary files is an extract from MSC-side E1 timeslot recording in a Nokia TCSM2 TFO session involving a cross-connect between two TRAU channels. The extracts have been chosen to begin at the point where the TRAU starts emitting TFO frames, thereby beginning with a series of TFO frames that contain an embedded TFO_TRANS message. In each experiment, one of the two cross-connected TRAU channels emitted two "plain" TFO frames (not containing embedded TFO messages) in between the initial embedded TFO_TRANS and the subsequent embedded TFO_REQ_L; this channel was chosen for the present extracts. Each extract is thus 2560 PCM samples, containing 16 aligned TFO frames: 5 carrying TFO_TRANS, 2 plain, 9 carrying TFO_REQ_L.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 18 Mar 2025 22:56:23 +0000
parents d9c095357c32
children
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1 /*
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2 * This include file has been put together from Osmocom (specifically
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3 * libosmocore) header files, containing definitions for bit vector
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4 * manipulation and CRC functions.
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5 */
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6
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7 /* from bits.h */
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8
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9 /*! unpacked bit (0 or 1): 1 bit per byte */
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10 typedef uint8_t ubit_t;
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12 /* from crc8gen.h */
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13
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14 /*! structure describing a given CRC code of max 8 bits */
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15 struct osmo_crc8gen_code {
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16 int bits; /*!< Actual number of bits of the CRC */
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17 uint8_t poly; /*!< Polynom (normal representation, MSB omitted */
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18 uint8_t init; /*!< Initialization value of the CRC state */
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19 uint8_t remainder; /*!< Remainder of the CRC (final XOR) */
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20 };
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22 uint8_t osmo_crc8gen_compute_bits(const struct osmo_crc8gen_code *code,
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23 const ubit_t *in, int len);
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24 int osmo_crc8gen_check_bits(const struct osmo_crc8gen_code *code,
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25 const ubit_t *in, int len, const ubit_t *crc_bits);
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26 void osmo_crc8gen_set_bits(const struct osmo_crc8gen_code *code,
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27 const ubit_t *in, int len, ubit_t *crc_bits);