From 9187dd60a74240955801a7357e29097058e3b56c Mon Sep 17 00:00:00 2001
From: Kamal Mostafa <kamal@whence.com>
Date: Sat, 1 Sep 2012 13:34:50 -0700
Subject: [PATCH] minimodem: --rx same (NOAA SAME protocol)

---
 src/minimodem.1.in | 24 +++++++++++++++++-------
 src/minimodem.c    | 11 +++++++++++
 2 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/src/minimodem.1.in b/src/minimodem.1.in
index b23a565..6cfdaab 100644
--- a/src/minimodem.1.in
+++ b/src/minimodem.1.in
@@ -129,22 +129,27 @@ Run and report internal performance tests (all other flags are ignored).
 print program version
 .SH {baudmode}
 The required \fI{baudmode}\fR parameter may be any floating-point value to
-specify a baud rate, or the string "rtty".
+specify a baud rate, or either of the strings "rtty" or "same".
 The \fI{baudmode}\fR also implies certain other parameter defaults
 depending on the rate, including standard (or at least reasonable)
 default mark and space tone frequencies.
 .TP
+.B  {any floating point value N}
+: Bell-syle N bps \-\-ascii
+.TP
 .B    1200
-	: Bell202  1200 bps \-\-ascii
+: Bell202 1200 bps \-\-ascii
 .TP
 .B     300
-	: Bell103   300 bps \-\-ascii
+: Bell103 300 bps \-\-ascii
 .TP
 .B    rtty
-	: RTTY    45.45 bps \-\-baudot \-\-stopbits 1.5
+: RTTY 45.45 bps \-\-baudot \-\-stopbits 1.5
 .TP
-.B  {any floating point value N}
-	: Bell-like   N bps \-\-ascii
+.B    same
+: SAME 520.83 bps \-\-startbits 0 \-\-stopbits 0 \-\-sync-byte 0xAB
+.br
+	NOAA Specific Area Message Encoding (SAME) protocol
 .SH EXAMPLES
 .TP
 .B minimodem --tx 100
@@ -153,9 +158,14 @@ Transmit 100 baud tones from one computer ...
 .B minimodem --rx 100
 and receive 100 baud tones on another nearby computer.
 .TP
-.B minimodem --rx --auto-carrier rtty
+.B minimodem --rx -a rtty
 Decode amateur radio RTTY signals (listen near 14.085 MHz).
 .TP
+.B minimodem --rx same
+Decode NOAA SAME protocol emergency alert transmissions, e.g.
+.br
+http://en.wikipedia.org/wiki/Specific_Area_Message_Encoding
+.TP
 .B minimodem --tx 0.5
 Experiment with very low baud rates (works in noisy conditions).
 .TP
diff --git a/src/minimodem.c b/src/minimodem.c
index 2a8ed87..4b3e17e 100644
--- a/src/minimodem.c
+++ b/src/minimodem.c
@@ -563,6 +563,17 @@ main( int argc, char*argv[] )
 	    bfsk_n_data_bits = 5;
 	if ( bfsk_nstopbits < 0 )
 	    bfsk_nstopbits = 1.5;
+    } else if ( strncasecmp(modem_mode, "same",5)==0 ) {
+	// http://www.nws.noaa.gov/nwr/nwrsame.htm
+	bfsk_data_rate = 520.0 + 5/6.0;
+	bfsk_n_data_bits = 8;
+	bfsk_nstartbits = 0;
+	bfsk_nstopbits = 0;
+	bfsk_sync_on_data = 1;
+	bfsk_sync_byte = 0xAB;
+	bfsk_mark_f = 2083.0 + 1/3.0;
+	bfsk_space_f = 1562.5;
+	band_width = bfsk_data_rate;
     } else {
 	bfsk_data_rate = atof(modem_mode);
 	if ( bfsk_n_data_bits == 0 )