gsm48_arfcn_range_encode.c File Reference

#include <osmocom/gsm/protocol/gsm_04_08.h>
#include <osmocom/gsm/gsm48_arfcn_range_encode.h>
#include <osmocom/core/utils.h>
#include <errno.h>

Functions
static int	greatest_power_of_2_lesser_or_equal_to (int index)
static int	mod (int data, int range)
int	osmo_gsm48_range_enc_find_index (enum osmo_gsm48_range range, const int *freqs, const int size)
	Determine at which index to split the ARFCNs to create an equally size partition for the given range. More...
static int	_range_enc_arfcns (enum osmo_gsm48_range range, const int *arfcns, int size, int *out, const int index)
int	osmo_gsm48_range_enc_arfcns (enum osmo_gsm48_range range, const int *arfcns, int size, int *out, const int index)
	Range encode the ARFCN list. More...
int	osmo_gsm48_range_enc_determine_range (const int *arfcns, const int size, int *f0)
	This implements the range determination as described in GSM 04.08 J4. More...
static void	write_orig_arfcn (uint8_t *chan_list, int f0)
static void	write_all_wn (uint8_t *chan_list, int bit_offs, int *w, int w_size, int w1_len)
int	osmo_gsm48_range_enc_128 (uint8_t *chan_list, int f0, int *w)
int	osmo_gsm48_range_enc_256 (uint8_t *chan_list, int f0, int *w)
int	osmo_gsm48_range_enc_512 (uint8_t *chan_list, int f0, int *w)
int	osmo_gsm48_range_enc_1024 (uint8_t *chan_list, int f0, int f0_included, int *w)
int	osmo_gsm48_range_enc_filter_arfcns (int *arfcns, const int size, const int f0, int *f0_included)

Function Documentation

_range_enc_arfcns()

static int _range_enc_arfcns ( enum osmo_gsm48_range  range, const int *  arfcns, int  size, int *  out, const int  index  )

static

References greatest_power_of_2_lesser_or_equal_to(), mod(), osmo_gsm48_range_enc_arfcns(), and osmo_gsm48_range_enc_find_index().

Referenced by osmo_gsm48_range_enc_arfcns().

greatest_power_of_2_lesser_or_equal_to()

static int greatest_power_of_2_lesser_or_equal_to ( int  index )

inlinestatic

Referenced by _range_enc_arfcns().

mod()

static int mod ( int  data, int  range  )

inlinestatic

References data, and res.

Referenced by _range_enc_arfcns(), osmo_gsm48_range_enc_filter_arfcns(), and osmo_gsm48_range_enc_find_index().

osmo_gsm48_range_enc_1024()

int osmo_gsm48_range_enc_1024	(	uint8_t *	chan_list,
		int	f0,
		int	f0_included,
		int *	w
	)

References write_all_wn().

Referenced by range_encode().

osmo_gsm48_range_enc_128()

int osmo_gsm48_range_enc_128	(	uint8_t *	chan_list,
		int	f0,
		int *	w
	)

References write_all_wn(), and write_orig_arfcn().

Referenced by range_encode().

osmo_gsm48_range_enc_256()

int osmo_gsm48_range_enc_256	(	uint8_t *	chan_list,
		int	f0,
		int *	w
	)

References write_all_wn(), and write_orig_arfcn().

Referenced by range_encode().

osmo_gsm48_range_enc_512()

int osmo_gsm48_range_enc_512	(	uint8_t *	chan_list,
		int	f0,
		int *	w
	)

References write_all_wn(), and write_orig_arfcn().

Referenced by range_encode().

osmo_gsm48_range_enc_arfcns()

int osmo_gsm48_range_enc_arfcns	(	enum osmo_gsm48_range	range,
		const int *	arfcns,
		int	size,
		int *	out,
		const int	index
	)

Range encode the ARFCN list.

Parameters

range	The range to use.
arfcns	The list of ARFCNs
size	The size of the list of ARFCNs
out	Place to store the W(i) output.

References _range_enc_arfcns().

Referenced by _range_enc_arfcns(), and range_encode().

osmo_gsm48_range_enc_determine_range()

int osmo_gsm48_range_enc_determine_range	(	const int *	arfcns,
		const int	size,
		int *	f0
	)

This implements the range determination as described in GSM 04.08 J4.

The result will be a base frequency f0 and the range to use. Note that for range 1024 encoding f0 always refers to ARFCN 0 even if it is not an element of the arfcns list.

Parameters

[in]	arfcns	The input frequencies, they must be sorted, lowest number first
[in]	size	The length of the array
[out]	f0	The selected F0 base frequency. It might not be inside the list

References OSMO_GSM48_ARFCN_RANGE_1024, OSMO_GSM48_ARFCN_RANGE_128, OSMO_GSM48_ARFCN_RANGE_256, OSMO_GSM48_ARFCN_RANGE_512, and OSMO_GSM48_ARFCN_RANGE_INVALID.

osmo_gsm48_range_enc_filter_arfcns()

int osmo_gsm48_range_enc_filter_arfcns	(	int *	arfcns,
		const int	size,
		const int	f0,
		int *	f0_included
	)

References mod().

Referenced by range_encode().

osmo_gsm48_range_enc_find_index()

int osmo_gsm48_range_enc_find_index	(	enum osmo_gsm48_range	range,
		const int *	freqs,
		const int	size
	)

Determine at which index to split the ARFCNs to create an equally size partition for the given range.

Return -1 if no such partition exists.

References mod(), and n.

Referenced by _range_enc_arfcns().

write_all_wn()

static void write_all_wn ( uint8_t *  chan_list, int  bit_offs, int *  w, int  w_size, int  w1_len  )

static

References level.

Referenced by osmo_gsm48_range_enc_1024(), osmo_gsm48_range_enc_128(), osmo_gsm48_range_enc_256(), and osmo_gsm48_range_enc_512().

write_orig_arfcn()

static void write_orig_arfcn ( uint8_t *  chan_list, int  f0  )

static

Referenced by osmo_gsm48_range_enc_128(), osmo_gsm48_range_enc_256(), and osmo_gsm48_range_enc_512().