diff options
| author | Vadim Yanitskiy <axilirator@gmail.com> | 2018-03-22 20:33:04 +0700 |
|---|---|---|
| committer | Vadim Yanitskiy <axilirator@gmail.com> | 2018-03-22 20:54:23 +0700 |
| commit | 02abbe542087e761dd0d5cae6eebe32c785cefb3 (patch) | |
| tree | f96667509350ffcbe7c9ca4d4bd951393d2dbb04 /src/host/trxcon | |
| parent | 23914b9cf855de8e847d450c70494626da2216e6 (diff) | |
trxcon/sched_prim.c: fix: correct the first padding byte
According to TS 144.006, section 5.2, the first octet containing
fill bits shall be set to the binary value "00101011" == 0x2b.
Change-Id: I8f0304bf84613a2dc07cb78aff0cb8bb4c5adf6c
Diffstat (limited to 'src/host/trxcon')
| -rw-r--r-- | src/host/trxcon/sched_prim.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/src/host/trxcon/sched_prim.c b/src/host/trxcon/sched_prim.c index c17fb2a4..e1c87bbf 100644 --- a/src/host/trxcon/sched_prim.c +++ b/src/host/trxcon/sched_prim.c @@ -251,7 +251,7 @@ int sched_prim_dummy(struct trx_lchan_state *lchan) * and with an information field of 0 octet length. */ static const uint8_t lapdm_fill_frame[] = { - 0x01, 0x03, 0x01, + 0x01, 0x03, 0x01, 0x2b, /* Pending part is to be randomized */ }; @@ -275,15 +275,16 @@ int sched_prim_dummy(struct trx_lchan_state *lchan) /* FIXME: should we do anything for CSD? */ return 0; } else { + /* Copy a fill frame payload */ + memcpy(prim_buffer, lapdm_fill_frame, sizeof(lapdm_fill_frame)); + /** - * TS 144.006, section 8.1.2.3 "Fill frames" - * A fill frame is a UI command frame for SAPI 0, P=0 - * and with an information field of 0 octet length. + * TS 144.006, section 5.2 "Frame delimitation and fill bits" + * Except for the first octet containing fill bits which shall + * be set to the binary value "00101011", each fill bit should + * be set to a random value when sent by the network. */ - memcpy(prim_buffer, lapdm_fill_frame, 3); - - /* Randomize pending unused bytes */ - for (i = 3; i < GSM_MACBLOCK_LEN; i++) + for (i = sizeof(lapdm_fill_frame); i < GSM_MACBLOCK_LEN; i++) prim_buffer[i] = (uint8_t) rand(); /* Define a prim length */ |