From d696ea3a6d640cd96a1ba2ac39bdc51d7f884e1d Mon Sep 17 00:00:00 2001
From: ZoRo <dos21h@gmail.com>
Date: Fri, 18 Feb 2022 20:33:58 +0000
Subject: Update to latest

---
 utils/rtl_adsb.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

(limited to 'utils/rtl_adsb.c')

diff --git a/utils/rtl_adsb.c b/utils/rtl_adsb.c
index 7de9204..7aea8dd 100644
--- a/utils/rtl_adsb.c
+++ b/utils/rtl_adsb.c
@@ -96,6 +96,7 @@ void usage(void)
 		"\t[-e allowed_errors (default: 5)]\n"
 		"\t[-g tuner_gain (default: automatic)]\n"
 		"\t[-p ppm_error (default: 0)]\n"
+		"\t[-T enable bias-T on GPIO PIN 0 (works for rtl-sdr.com v3 dongles)]\n"
 		"\tfilename (a '-' dumps samples to stdout)\n"
 		"\t (omitting the filename also uses stdout)\n\n"
 		"Streaming with netcat:\n"
@@ -182,7 +183,7 @@ int magnitute(uint8_t *buf, int len)
 	return len/2;
 }
 
-uint16_t single_manchester(uint16_t a, uint16_t b, uint16_t c, uint16_t d)
+static inline uint16_t single_manchester(uint16_t a, uint16_t b, uint16_t c, uint16_t d)
 /* takes 4 consecutive real samples, return 0 or 1, BADSAMPLE on error */
 {
 	int bit, bit_p;
@@ -223,17 +224,17 @@ uint16_t single_manchester(uint16_t a, uint16_t b, uint16_t c, uint16_t d)
 	return BADSAMPLE;
 }
 
-inline uint16_t min16(uint16_t a, uint16_t b)
+static inline uint16_t min16(uint16_t a, uint16_t b)
 {
 	return a<b ? a : b;
 }
 
-inline uint16_t max16(uint16_t a, uint16_t b)
+static inline uint16_t max16(uint16_t a, uint16_t b)
 {
 	return a>b ? a : b;
 }
 
-int preamble(uint16_t *buf, int i)
+static inline int preamble(uint16_t *buf, int i)
 /* returns 0/1 for preamble at index i */
 {
 	int i2;
@@ -371,11 +372,12 @@ int main(int argc, char **argv)
 	int dev_index = 0;
 	int dev_given = 0;
 	int ppm_error = 0;
+	int enable_biastee = 0;
 	pthread_cond_init(&ready, NULL);
 	pthread_mutex_init(&ready_m, NULL);
 	squares_precompute();
 
-	while ((opt = getopt(argc, argv, "d:g:p:e:Q:VS")) != -1)
+	while ((opt = getopt(argc, argv, "d:g:p:e:Q:VST")) != -1)
 	{
 		switch (opt) {
 		case 'd':
@@ -400,6 +402,9 @@ int main(int argc, char **argv)
 		case 'Q':
 			quality = (int)(atof(optarg) * 10);
 			break;
+		case 'T':
+			enable_biastee = 1;
+			break;
 		default:
 			usage();
 			return 0;
@@ -470,6 +475,10 @@ int main(int argc, char **argv)
 	/* Set the sample rate */
 	verbose_set_sample_rate(dev, ADSB_RATE);
 
+	rtlsdr_set_bias_tee(dev, enable_biastee);
+	if (enable_biastee)
+		fprintf(stderr, "activated bias-T on GPIO PIN 0\n");
+
 	/* Reset endpoint before we start reading from it (mandatory) */
 	verbose_reset_buffer(dev);
 
@@ -483,6 +492,8 @@ int main(int argc, char **argv)
 	else {
 		fprintf(stderr, "\nLibrary error %d, exiting...\n", r);}
 	rtlsdr_cancel_async(dev);
+	pthread_cancel(demod_thread);
+	pthread_join(demod_thread, NULL);
 	pthread_cond_destroy(&ready);
 	pthread_mutex_destroy(&ready_m);
 
-- 
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