diff options
Diffstat (limited to 'src/gsm/gsm_utils.c')
| -rw-r--r-- | src/gsm/gsm_utils.c | 71 |
1 files changed, 48 insertions, 23 deletions
diff --git a/src/gsm/gsm_utils.c b/src/gsm/gsm_utils.c index 7e6c7947..8b4b5586 100644 --- a/src/gsm/gsm_utils.c +++ b/src/gsm/gsm_utils.c @@ -706,36 +706,61 @@ enum gsm_band gsm_band_parse(const char* mhz) } } -/*! Resolve GSM band from ARFCN +/*! Resolve GSM band from ARFCN. * In Osmocom, we use the highest bit of the \a arfcn to indicate PCS * \param[in] arfcn Osmocom ARFCN, highest bit determines PCS mode - * \returns GSM Band */ -enum gsm_band gsm_arfcn2band(uint16_t arfcn) + * \param[out] band GSM Band containing \arfcn if arfcn is valid, undetermined otherwise + * \returns 0 if arfcn is valid and \a band was set, negative on error */ +int gsm_arfcn2band_rc(uint16_t arfcn, enum gsm_band *band) { int is_pcs = arfcn & ARFCN_PCS; arfcn &= ~ARFCN_FLAG_MASK; - if (is_pcs) - return GSM_BAND_1900; - else if (arfcn <= 124) - return GSM_BAND_900; - else if (arfcn >= 955 && arfcn <= 1023) - return GSM_BAND_900; - else if (arfcn >= 128 && arfcn <= 251) - return GSM_BAND_850; - else if (arfcn >= 512 && arfcn <= 885) - return GSM_BAND_1800; - else if (arfcn >= 259 && arfcn <= 293) - return GSM_BAND_450; - else if (arfcn >= 306 && arfcn <= 340) - return GSM_BAND_480; - else if (arfcn >= 350 && arfcn <= 425) - return GSM_BAND_810; - else if (arfcn >= 438 && arfcn <= 511) - return GSM_BAND_750; - else - return GSM_BAND_1800; + if (is_pcs) { + *band = GSM_BAND_1900; + return 0; + } else if (arfcn <= 124) { + *band = GSM_BAND_900; + return 0; + } else if (arfcn >= 955 && arfcn <= 1023) { + *band = GSM_BAND_900; + return 0; + } else if (arfcn >= 128 && arfcn <= 251) { + *band = GSM_BAND_850; + return 0; + } else if (arfcn >= 512 && arfcn <= 885) { + *band = GSM_BAND_1800; + return 0; + } else if (arfcn >= 259 && arfcn <= 293) { + *band = GSM_BAND_450; + return 0; + } else if (arfcn >= 306 && arfcn <= 340) { + *band = GSM_BAND_480; + return 0; + } else if (arfcn >= 350 && arfcn <= 425) { + *band = GSM_BAND_810; + return 0; + } else if (arfcn >= 438 && arfcn <= 511) { + *band = GSM_BAND_750; + return 0; + } + return -1; +} + +/*! Resolve GSM band from ARFCN, aborts process on invalid ARFCN. + * In Osmocom, we use the highest bit of the \a arfcn to indicate PCS. + * DEPRECATED: Use gsm_arfcn2band_rc instead. + * \param[in] arfcn Osmocom ARFCN, highest bit determines PCS mode + * \returns GSM Band if ARFCN is valid (part of any valid band), aborts otherwise */ +enum gsm_band gsm_arfcn2band(uint16_t arfcn) +{ + enum gsm_band band; + if (gsm_arfcn2band_rc(arfcn, &band) == 0) + return band; + + osmo_panic("%s:%d Invalid arfcn %" PRIu16 " passed to gsm_arfcn2band\n", + __FILE__, __LINE__, arfcn); } struct gsm_freq_range { |