From 966ef4a54d21d846304a7eafa125574a28f68caf Mon Sep 17 00:00:00 2001 From: Vladimir 'phcoder' Serbinenko Date: Mon, 21 Jan 2013 14:55:30 +0100 Subject: [PATCH 127/364] Improve spkmomdem reliability by adding a separator between bytes. --- ChangeLog | 4 ++++ util/spkmodem-recv.c | 11 ++++++++--- 2 files changed, 12 insertions(+), 3 deletions(-) diff --git a/ChangeLog b/ChangeLog index ff29177..3c7552b 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,7 @@ +2013-01-21 Vladimir Serbinenko + + Improve spkmomdem reliability by adding a separator between bytes. + 2013-01-21 Colin Watson * grub-core/partmap/msdos.c (embed_signatures): Add the signature of diff --git a/util/spkmodem-recv.c b/util/spkmodem-recv.c index 9075f9a..9083c1a 100644 --- a/util/spkmodem-recv.c +++ b/util/spkmodem-recv.c @@ -24,7 +24,7 @@ /* Usage: parecord --channels=1 --rate=48000 --format=s16le | ./spkmodem-recv */ #define SAMPLES_PER_TRAME 240 -#define FREQ_SEP_MIN 6 +#define FREQ_SEP_MIN 5 #define FREQ_SEP_MAX 15 #define FREQ_DATA_MIN 15 #define FREQ_DATA_THRESHOLD 25 @@ -32,6 +32,7 @@ #define THRESHOLD 500 #define DEBUG 0 +#define FLUSH_TIMEOUT 1 static signed short trame[2 * SAMPLES_PER_TRAME]; static signed short pulse[2 * SAMPLES_PER_TRAME]; @@ -70,15 +71,18 @@ main () int bitn = 7; char c = 0; int i; + int llp = 0; while (!feof (stdin)) { - if (lp > 20000) + if (lp > 3 * SAMPLES_PER_TRAME) { - fflush (stdout); bitn = 7; c = 0; lp = 0; + llp++; } + if (llp == FLUSH_TIMEOUT) + fflush (stdout); if (f2 > FREQ_SEP_MIN && f2 < FREQ_SEP_MAX && f1 > FREQ_DATA_MIN && f1 < FREQ_DATA_MAX) { @@ -100,6 +104,7 @@ main () c = 0; } lp = 0; + llp = 0; for (i = 0; i < SAMPLES_PER_TRAME; i++) read_sample (); continue; -- 1.8.1.4