tree c01c36ce46fec6c86ed2dc0c93813ae19452822c
parent 07b6487c5ac11a95e4bd0e11c6c6c65437776776
author Vadim Yanitskiy <vyanitskiy@sysmocom.de> 1591812284 +0700
committer Vadim Yanitskiy <vyanitskiy@sysmocom.de> 1591813780 +0700

bts: fix send_gsmtap_rach(): properly pack 11 bit RA

According to 3GPP TS 44.004, section 7.4a, two alternative RACH
block formats are specified: 8 bit (1 octet) and 11 bit. The
bit order is LSB (right to left), byte order is MSB.

In PCUIF RACH.ind structure (see gsm_pcu_if_rach_ind) we use
a field of type uint16_t to store RA values regardles of the
block format. Thus when packing it to bytes, we cannot just
cast uint16_t* to uint8_t*, we need to do some bit shifting.

Change-Id: I08a0a908f855b0d8a002df732e02781126d27dfb