diff options
| author | Harald Welte <laforge@gnumonks.org> | 2010-03-27 12:22:21 +0800 |
|---|---|---|
| committer | Harald Welte <laforge@gnumonks.org> | 2010-03-27 12:24:29 +0800 |
| commit | c9c4c4b819ccd85b343a1c9bdc1ef8085f801345 (patch) | |
| tree | 6317c2c33a608335027870c4519cd246e52f26ce | |
| parent | bbe405b7fe3251978be30e81e068a9ad7376c92d (diff) | |
sercomm: ESCAPE every NUL (0x00) byte in the data stream
For some reason, at least on the C123, a sequence of multiple NUL bytes
seems to get corrupted somewhere in the Rx side on the phone itself (the
NUL plus the following character get dropped).
We now simply work around this issue by having our sercomm/HDLC layer
escape all NUL octets in the stream.
| -rw-r--r-- | src/target/firmware/comm/sercomm.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/target/firmware/comm/sercomm.c b/src/target/firmware/comm/sercomm.c index 2b3586e8..505de70b 100644 --- a/src/target/firmware/comm/sercomm.c +++ b/src/target/firmware/comm/sercomm.c @@ -169,7 +169,8 @@ int sercomm_drv_pull(uint8_t *ch) sercomm.tx.next_char = NULL; /* escaping for the two control octets */ } else if (*sercomm.tx.next_char == HDLC_FLAG || - *sercomm.tx.next_char == HDLC_ESCAPE) { + *sercomm.tx.next_char == HDLC_ESCAPE || + *sercomm.tx.next_char == 0x00) { /* send an escape octet */ *ch = HDLC_ESCAPE; /* invert bit 5 of the next octet to be sent */ |