si: Fix range1024 encoding
f0 is currently set to arfcns[0] in range_enc_determine_range(), while GSM 04.08 requires f0 to be ARFCN 0 in range1024 encoding. This patch modifies range_enc_determine_range() to force f0 to be 0 if this encoding is used. This way the case distinction in range_enc_filter_arfcns() is not longer necessary. Sponsored-by: On-Waves ehf
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@ -16,7 +16,7 @@ enum {
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int range_enc_determine_range(const int *arfcns, int size, int *f0_out);
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int range_enc_arfcns(const int rng, const int *arfcns, int sze, int *out, int idx);
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int range_enc_find_index(const int rng, const int *arfcns, int size);
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int range_enc_filter_arfcns(const int rng, int *arfcns, const int sze, const int f0, int *f0_included);
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int range_enc_filter_arfcns(int *arfcns, const int sze, const int f0, int *f0_included);
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int range_enc_range128(uint8_t *chan_list, int f0, int *w);
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int range_enc_range256(uint8_t *chan_list, int f0, int *w);
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@ -144,7 +144,9 @@ int range_enc_arfcns(const int range,
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*/
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/**
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* This implements the range determination as described in GSM 04.08 J4. The
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* result will be a base frequency f0 and the range to use.
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* result will be a base frequency f0 and the range to use. Note that for range
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* 1024 encoding f0 always refers to ARFCN 0 even if it is not an element of
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* the arfcns list.
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*
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* \param[in] arfcns The input frequencies, they must be sorted, lowest number first
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* \param[in] size The length of the array
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@ -166,8 +168,10 @@ int range_enc_determine_range(const int *arfcns, const int size, int *f0)
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return ARFCN_RANGE_256;
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if (max < 512 && size <= 18)
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return ARFCN_RANGE_512;
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if (max < 1024 && size <= 17)
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if (max < 1024 && size <= 17) {
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*f0 = 0;
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return ARFCN_RANGE_1024;
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}
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return ARFCN_RANGE_INVALID;
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}
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@ -271,34 +275,24 @@ int range_enc_range1024(uint8_t *chan_list, int f0, int f0_included, int *w)
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return -1;
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}
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int range_enc_filter_arfcns(const int range, int *arfcns,
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const int size, const int f0, int *f0_included)
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int range_enc_filter_arfcns(int *arfcns,
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const int size, const int f0, int *f0_included)
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{
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int i, j = 0;
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*f0_included = 0;
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if (range == ARFCN_RANGE_1024) {
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for (i = 0; i < size; ++i) {
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if (arfcns[i] == f0) {
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*f0_included = 1;
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continue;
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}
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/* copy and subtract */
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arfcns[j++] = mod(arfcns[i] - 1, 1024);
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for (i = 0; i < size; ++i) {
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/*
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* Appendix J.4 says the following:
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* All frequencies except F(0), minus F(0) + 1.
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* I assume we need to exclude it here.
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*/
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if (arfcns[i] == f0) {
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*f0_included = 1;
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continue;
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}
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} else {
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for (i = 0; i < size; ++i) {
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/*
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* Appendix J.4 says the following:
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* All frequencies except F(0), minus F(0) + 1.
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* I assume we need to exclude it here.
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*/
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if (arfcns[i] == f0)
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continue;
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arfcns[j++] = mod(arfcns[i] - (f0 + 1), 1024);
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}
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arfcns[j++] = mod(arfcns[i] - (f0 + 1), 1024);
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}
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return j;
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@ -197,7 +197,7 @@ static int enc_freq_lst_range(uint8_t *chan_list,
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* Manipulate the ARFCN list according to the rules in J4 depending
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* on the selected range.
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*/
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arfcns_used = range_enc_filter_arfcns(range, arfcns, arfcns_used,
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arfcns_used = range_enc_filter_arfcns(arfcns, arfcns_used,
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f0, &f0_included);
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memset(w, 0, sizeof(w));
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@ -152,12 +152,12 @@ static int test_single_range_encoding(int range, const int *orig_arfcns,
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arfcns_used = arfcns_num;
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memmove(arfcns, orig_arfcns, sizeof(arfcns));
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f0 = arfcns[0];
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f0 = range == ARFCN_RANGE_1024 ? 0 : arfcns[0];
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/*
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* Manipulate the ARFCN list according to the rules in J4 depending
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* on the selected range.
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*/
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arfcns_used = range_enc_filter_arfcns(range, arfcns, arfcns_used,
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arfcns_used = range_enc_filter_arfcns(arfcns, arfcns_used,
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f0, &f0_included);
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memset(w, 0, sizeof(w));
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@ -354,28 +354,28 @@ static void test_arfcn_filter()
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/* check that the arfcn is taken out. f0_included is only set for Range1024 */
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f0_included = 24;
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res = range_enc_filter_arfcns(ARFCN_RANGE_512, arfcns, ARRAY_SIZE(arfcns),
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arfcns[0], &f0_included);
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VERIFY(res, ==, ARRAY_SIZE(arfcns) - 1);
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VERIFY(f0_included, ==, 0);
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for (i = 0; i < res; ++i)
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VERIFY(arfcns[i], ==, ((i+2) * 2) - (2+1));
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/* check with range1024 */
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for (i = 0; i < ARRAY_SIZE(arfcns); ++i)
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arfcns[i] = (i + 1) * 2;
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res = range_enc_filter_arfcns(ARFCN_RANGE_1024, arfcns, ARRAY_SIZE(arfcns),
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res = range_enc_filter_arfcns(arfcns, ARRAY_SIZE(arfcns),
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arfcns[0], &f0_included);
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VERIFY(res, ==, ARRAY_SIZE(arfcns) - 1);
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VERIFY(f0_included, ==, 1);
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for (i = 0; i < res; ++i)
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VERIFY(arfcns[i], ==, ((i + 2) * 2) - 1);
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VERIFY(arfcns[i], ==, ((i+2) * 2) - (2+1));
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/* check with range1024, not included */
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/* check with range1024, ARFCN 0 is included */
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for (i = 0; i < ARRAY_SIZE(arfcns); ++i)
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arfcns[i] = i * 2;
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res = range_enc_filter_arfcns(arfcns, ARRAY_SIZE(arfcns),
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0, &f0_included);
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VERIFY(res, ==, ARRAY_SIZE(arfcns) - 1);
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VERIFY(f0_included, ==, 1);
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for (i = 0; i < res; ++i)
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VERIFY(arfcns[i], ==, (i + 1) * 2 - 1);
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/* check with range1024, ARFCN 0 not included */
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for (i = 0; i < ARRAY_SIZE(arfcns); ++i)
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arfcns[i] = (i + 1) * 2;
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res = range_enc_filter_arfcns(ARFCN_RANGE_1024, arfcns, ARRAY_SIZE(arfcns),
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11, &f0_included);
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res = range_enc_filter_arfcns(arfcns, ARRAY_SIZE(arfcns),
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0, &f0_included);
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VERIFY(res, ==, ARRAY_SIZE(arfcns));
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VERIFY(f0_included, ==, 0);
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for (i = 0; i < res; ++i)
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