From a190677ad41125b88cf0c548ad1278d6e7a2a33f Mon Sep 17 00:00:00 2001
From: matthewbrandes <matthewb@report4u.net>
Date: Tue, 8 Jul 2014 16:55:16 -0500
Subject: [PATCH] Create convienience.c

---
 convienience.c | 334 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 334 insertions(+)
 create mode 100644 convienience.c

diff --git a/convienience.c b/convienience.c
new file mode 100644
index 0000000..6565e1a
--- /dev/null
+++ b/convienience.c
@@ -0,0 +1,334 @@
+/*
+ * Copyright (C) 2013-2014 by Kyle Keen <keenerd@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* a collection of user friendly tools
+ * todo: use strtol for more flexible int parsing
+ * */
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifndef _WIN32
+#include <unistd.h>
+#else
+#include <windows.h>
+#include <fcntl.h>
+#include <io.h>
+#define _USE_MATH_DEFINES
+#endif
+
+#include <math.h>
+
+#include "rtl-sdr.h"
+
+double atofs(char *s)
+/* standard suffixes */
+{
+	char last;
+	int len;
+	double suff = 1.0;
+	len = strlen(s);
+	last = s[len-1];
+	s[len-1] = '\0';
+	switch (last) {
+		case 'g':
+		case 'G':
+			suff *= 1e3;
+		case 'm':
+		case 'M':
+			suff *= 1e3;
+		case 'k':
+		case 'K':
+			suff *= 1e3;
+			suff *= atof(s);
+			s[len-1] = last;
+			return suff;
+	}
+	s[len-1] = last;
+	return atof(s);
+}
+
+double atoft(char *s)
+/* time suffixes, returns seconds */
+{
+	char last;
+	int len;
+	double suff = 1.0;
+	len = strlen(s);
+	last = s[len-1];
+	s[len-1] = '\0';
+	switch (last) {
+		case 'h':
+		case 'H':
+			suff *= 60;
+		case 'm':
+		case 'M':
+			suff *= 60;
+		case 's':
+		case 'S':
+			suff *= atof(s);
+			s[len-1] = last;
+			return suff;
+	}
+	s[len-1] = last;
+	return atof(s);
+}
+
+double atofp(char *s)
+/* percent suffixes */
+{
+	char last;
+	int len;
+	double suff = 1.0;
+	len = strlen(s);
+	last = s[len-1];
+	s[len-1] = '\0';
+	switch (last) {
+		case '%':
+			suff *= 0.01;
+			suff *= atof(s);
+			s[len-1] = last;
+			return suff;
+	}
+	s[len-1] = last;
+	return atof(s);
+}
+
+int nearest_gain(rtlsdr_dev_t *dev, int target_gain)
+{
+	int i, r, err1, err2, count, nearest;
+	int* gains;
+	r = rtlsdr_set_tuner_gain_mode(dev, 1);
+	if (r < 0) {
+		fprintf(stderr, "WARNING: Failed to enable manual gain.\n");
+		return r;
+	}
+	count = rtlsdr_get_tuner_gains(dev, NULL);
+	if (count <= 0) {
+		return 0;
+	}
+	gains = malloc(sizeof(int) * count);
+	count = rtlsdr_get_tuner_gains(dev, gains);
+	nearest = gains[0];
+	for (i=0; i<count; i++) {
+		err1 = abs(target_gain - nearest);
+		err2 = abs(target_gain - gains[i]);
+		if (err2 < err1) {
+			nearest = gains[i];
+		}
+	}
+	free(gains);
+	return nearest;
+}
+
+int verbose_set_frequency(rtlsdr_dev_t *dev, uint32_t frequency)
+{
+	int r;
+	r = rtlsdr_set_center_freq(dev, frequency);
+	if (r < 0) {
+		fprintf(stderr, "WARNING: Failed to set center freq.\n");
+	} else {
+		fprintf(stderr, "Tuned to %u Hz.\n", frequency);
+	}
+	return r;
+}
+
+int verbose_set_sample_rate(rtlsdr_dev_t *dev, uint32_t samp_rate)
+{
+	int r;
+	r = rtlsdr_set_sample_rate(dev, samp_rate);
+	if (r < 0) {
+		fprintf(stderr, "WARNING: Failed to set sample rate.\n");
+	} else {
+		fprintf(stderr, "Sampling at %u S/s.\n", samp_rate);
+	}
+	return r;
+}
+
+int verbose_direct_sampling(rtlsdr_dev_t *dev, int on)
+{
+	int r;
+	r = rtlsdr_set_direct_sampling(dev, on);
+	if (r != 0) {
+		fprintf(stderr, "WARNING: Failed to set direct sampling mode.\n");
+		return r;
+	}
+	if (on == 0) {
+		fprintf(stderr, "Direct sampling mode disabled.\n");}
+	if (on == 1) {
+		fprintf(stderr, "Enabled direct sampling mode, input 1/I.\n");}
+	if (on == 2) {
+		fprintf(stderr, "Enabled direct sampling mode, input 2/Q.\n");}
+	if (on == 3) {
+		fprintf(stderr, "Enabled no-mod direct sampling mode.\n");}
+	return r;
+}
+
+int verbose_offset_tuning(rtlsdr_dev_t *dev)
+{
+	int r;
+	r = rtlsdr_set_offset_tuning(dev, 1);
+	if (r != 0) {
+		fprintf(stderr, "WARNING: Failed to set offset tuning.\n");
+	} else {
+		fprintf(stderr, "Offset tuning mode enabled.\n");
+	}
+	return r;
+}
+
+int verbose_auto_gain(rtlsdr_dev_t *dev)
+{
+	int r;
+	r = rtlsdr_set_tuner_gain_mode(dev, 0);
+	if (r != 0) {
+		fprintf(stderr, "WARNING: Failed to set tuner gain.\n");
+	} else {
+		fprintf(stderr, "Tuner gain set to automatic.\n");
+	}
+	return r;
+}
+
+int verbose_gain_set(rtlsdr_dev_t *dev, int gain)
+{
+	int r;
+	r = rtlsdr_set_tuner_gain_mode(dev, 1);
+	if (r < 0) {
+		fprintf(stderr, "WARNING: Failed to enable manual gain.\n");
+		return r;
+	}
+	r = rtlsdr_set_tuner_gain(dev, gain);
+	if (r != 0) {
+		fprintf(stderr, "WARNING: Failed to set tuner gain.\n");
+	} else {
+		fprintf(stderr, "Tuner gain set to %0.2f dB.\n", gain/10.0);
+	}
+	return r;
+}
+
+int verbose_ppm_set(rtlsdr_dev_t *dev, int ppm_error)
+{
+	int r;
+	if (ppm_error == 0) {
+		return 0;}
+	r = rtlsdr_set_freq_correction(dev, ppm_error);
+	if (r < 0) {
+		fprintf(stderr, "WARNING: Failed to set ppm error.\n");
+	} else {
+		fprintf(stderr, "Tuner error set to %i ppm.\n", ppm_error);
+	}
+	return r;
+}
+
+int verbose_ppm_eeprom(rtlsdr_dev_t *dev, int *ppm_error)
+{
+	#define start_char ' '
+	#define stop_char 'p'
+	int i, r, len, status = -1;
+	char vendor[256], product[256], serial[256];
+	r = rtlsdr_get_usb_strings(dev, vendor, product, serial);
+	if (r) {
+		return r;
+	}
+	len = strlen(serial);
+	if (len <= 3) {
+		return -1;}
+	if (serial[len-1] != stop_char) {
+		return -1;}
+	serial[len-1] = '\0';
+	for (i=len-3; i>=0; i--) {
+		if (serial[i] != start_char) {
+			continue;}
+		fprintf(stderr, "PPM calibration found in eeprom.\n");
+		status = 0;
+		*ppm_error = atoi(serial + i + 1);
+		break;
+	}
+	serial[len-1] = stop_char;
+	return status;
+}
+
+int verbose_reset_buffer(rtlsdr_dev_t *dev)
+{
+	int r;
+	r = rtlsdr_reset_buffer(dev);
+	if (r < 0) {
+		fprintf(stderr, "WARNING: Failed to reset buffers.\n");}
+	return r;
+}
+
+int verbose_device_search(char *s)
+{
+	int i, device_count, device, offset;
+	char *s2;
+	char vendor[256], product[256], serial[256];
+	device_count = rtlsdr_get_device_count();
+	if (!device_count) {
+		fprintf(stderr, "No supported devices found.\n");
+		return -1;
+	}
+	fprintf(stderr, "Found %d device(s):\n", device_count);
+	for (i = 0; i < device_count; i++) {
+		rtlsdr_get_device_usb_strings(i, vendor, product, serial);
+		fprintf(stderr, "  %d:  %s, %s, SN: %s\n", i, vendor, product, serial);
+	}
+	fprintf(stderr, "\n");
+	/* does string look like raw id number */
+	device = (int)strtol(s, &s2, 0);
+	if (s2[0] == '\0' && device >= 0 && device < device_count) {
+		fprintf(stderr, "Using device %d: %s\n",
+			device, rtlsdr_get_device_name((uint32_t)device));
+		return device;
+	}
+	/* does string exact match a serial */
+	for (i = 0; i < device_count; i++) {
+		rtlsdr_get_device_usb_strings(i, vendor, product, serial);
+		if (strcmp(s, serial) != 0) {
+			continue;}
+		device = i;
+		fprintf(stderr, "Using device %d: %s\n",
+			device, rtlsdr_get_device_name((uint32_t)device));
+		return device;
+	}
+	/* does string prefix match a serial */
+	for (i = 0; i < device_count; i++) {
+		rtlsdr_get_device_usb_strings(i, vendor, product, serial);
+		if (strncmp(s, serial, strlen(s)) != 0) {
+			continue;}
+		device = i;
+		fprintf(stderr, "Using device %d: %s\n",
+			device, rtlsdr_get_device_name((uint32_t)device));
+		return device;
+	}
+	/* does string suffix match a serial */
+	for (i = 0; i < device_count; i++) {
+		rtlsdr_get_device_usb_strings(i, vendor, product, serial);
+		offset = strlen(serial) - strlen(s);
+		if (offset < 0) {
+			continue;}
+		if (strncmp(s, serial+offset, strlen(s)) != 0) {
+			continue;}
+		device = i;
+		fprintf(stderr, "Using device %d: %s\n",
+			device, rtlsdr_get_device_name((uint32_t)device));
+		return device;
+	}
+	fprintf(stderr, "No matching devices found.\n");
+	return -1;
+}
+
+// vim: tabstop=8:softtabstop=8:shiftwidth=8:noexpandtab