add rtl_biast, add biast EEPROM hack

README

@@ -10,3 +10,5 @@ Modified RTL-SDR Blog Version
 1) VCO PLL current fix - Improves stability at frequencies above ~1.5 GHz https://www.rtl-sdr.com/beta-testing-a-modified-rtl-sdr-driver-for-l-band-heat-issues/
 2) RTL_TCP ring buffer enhancement by Stephen Blinick https://www.rtl-sdr.com/significantly-improving-rtl_tcps-performance-with-ring-buffers/
 3) Enabled direct sampling for rtl_tcp
+4) rtl_biast program added, including the ability to turn on/off any GPIO
+5) Hack to force the bias tee to always be on by setting the unused IR endpoint bit to 0 in the EEPROM with "rtl_eeprom -i 0"

build/install_manifest.txt

@@ -12,4 +12,5 @@
 /usr/local/bin/rtl_fm
 /usr/local/bin/rtl_eeprom
 /usr/local/bin/rtl_adsb
-/usr/local/bin/rtl_power
+/usr/local/bin/rtl_power
+/usr/local/bin/rtl_biast

include/rtl-sdr.h

@@ -389,6 +389,16 @@ RTLSDR_API int rtlsdr_cancel_async(rtlsdr_dev_t *dev);
  */
 RTLSDR_API int rtlsdr_set_bias_tee(rtlsdr_dev_t *dev, int on);
 
+/*!
+ * Enable or disable any GPIO.
+ * \param dev the device handle given by rtlsdr_open()
+ * \param gpio_pin GPIO pin number for ON
+ * \param on 1 for GPIO on. 0 for GPIO off.
+ */
+RTLSDR_API int rtlsdr_set_gpio(rtlsdr_dev_t *dev, int gpio_pin, int on);
+
+
+
 #ifdef __cplusplus
 }
 #endif

src/CMakeLists.txt

@@ -91,7 +91,9 @@ add_executable(rtl_fm rtl_fm.c)
 add_executable(rtl_eeprom rtl_eeprom.c)
 add_executable(rtl_adsb rtl_adsb.c)
 add_executable(rtl_power rtl_power.c)
-set(INSTALL_TARGETS rtlsdr_shared rtlsdr_static rtl_sdr rtl_tcp rtl_test rtl_fm rtl_eeprom rtl_adsb rtl_power)
+add_executable(rtl_biast rtl_biast.c)
+
+set(INSTALL_TARGETS rtlsdr_shared rtlsdr_static rtl_sdr rtl_tcp rtl_test rtl_fm rtl_eeprom rtl_adsb rtl_power rtl_biast)
 
 target_link_libraries(rtl_sdr rtlsdr_shared convenience_static
     ${LIBUSB_LIBRARIES}
@@ -121,6 +123,10 @@ target_link_libraries(rtl_power rtlsdr_shared convenience_static
     ${LIBUSB_LIBRARIES}
     ${CMAKE_THREAD_LIBS_INIT}
 )
+target_link_libraries(rtl_biast rtlsdr_shared convenience_static
+    ${LIBUSB_LIBRARIES}
+    ${CMAKE_THREAD_LIBS_INIT}
+)
 if(UNIX)
 target_link_libraries(rtl_fm m)
 target_link_libraries(rtl_adsb m)
@@ -140,6 +146,7 @@ target_link_libraries(rtl_fm libgetopt_static)
 target_link_libraries(rtl_eeprom libgetopt_static)
 target_link_libraries(rtl_adsb libgetopt_static)
 target_link_libraries(rtl_power libgetopt_static)
+target_link_libraries(rtl_biast libgetopt_static)
 set_property(TARGET rtl_sdr APPEND PROPERTY COMPILE_DEFINITIONS "rtlsdr_STATIC" )
 set_property(TARGET rtl_tcp APPEND PROPERTY COMPILE_DEFINITIONS "rtlsdr_STATIC" )
 set_property(TARGET rtl_test APPEND PROPERTY COMPILE_DEFINITIONS "rtlsdr_STATIC" )
@@ -147,6 +154,7 @@ set_property(TARGET rtl_fm APPEND PROPERTY COMPILE_DEFINITIONS "rtlsdr_STATIC" )
 set_property(TARGET rtl_eeprom APPEND PROPERTY COMPILE_DEFINITIONS "rtlsdr_STATIC" )
 set_property(TARGET rtl_adsb APPEND PROPERTY COMPILE_DEFINITIONS "rtlsdr_STATIC" )
 set_property(TARGET rtl_power APPEND PROPERTY COMPILE_DEFINITIONS "rtlsdr_STATIC" )
+set_property(TARGET rtl_biast APPEND PROPERTY COMPILE_DEFINITIONS "rtlsdr_STATIC" )
 endif()
 ########################################################################
 # Install built library files & utilities

src/librtlsdr.c

@@ -125,6 +125,7 @@ struct rtlsdr_dev {
 	int dev_lost;
 	int driver_active;
 	unsigned int xfer_errors;
+	int force_bt;
 };
 
 void rtlsdr_set_gpio_bit(rtlsdr_dev_t *dev, uint8_t gpio, int val);
@@ -368,6 +369,7 @@ static rtlsdr_dongle_t known_devices[] = {
 #define BULK_TIMEOUT	0
 
 #define EEPROM_ADDR	0xa0
+#define EEPROM_SIZE     256
 
 enum usb_reg {
 	USB_SYSCTL		= 0x2000,
@@ -1447,6 +1449,7 @@ int rtlsdr_open(rtlsdr_dev_t **out_dev, uint32_t index)
 	struct libusb_device_descriptor dd;
 	uint8_t reg;
 	ssize_t cnt;
+	uint8_t buf[EEPROM_SIZE];
 
 	dev = malloc(sizeof(rtlsdr_dev_t));
 	if (NULL == dev)
@@ -1609,6 +1612,7 @@ found:
 
 		/* enable spectrum inversion */
 		rtlsdr_demod_write_reg(dev, 1, 0x15, 0x01, 1);
+
 		break;
 	case RTLSDR_TUNER_UNKNOWN:
 		fprintf(stderr, "No supported tuner found\n");
@@ -1618,6 +1622,14 @@ found:
 		break;
 	}
 
+
+        /* Hack to force the Bias T to always be on if we set the IR-Endpoint bit in the EEPROM to 0. */
+        //force_bt = 0;
+	r = rtlsdr_read_eeprom(dev, buf, 0, EEPROM_SIZE);
+        dev->force_bt = (buf[7] & 0x02) ? 0 : 1;
+	if(dev->force_bt) rtlsdr_set_gpio(dev, 0, 1);
+
+
 	if (dev->tuner->init)
 		r = dev->tuner->init(dev);
 
@@ -2014,8 +2026,24 @@ int rtlsdr_set_bias_tee(rtlsdr_dev_t *dev, int on)
 	if (!dev)
 		return -1;
 
+	if(dev->force_bt) return 1; // If force_bt is on from the EEPROM, do not allow bias tee to turn off
+
 	rtlsdr_set_gpio_output(dev, 0);
 	rtlsdr_set_gpio_bit(dev, 0, on);
 
 	return 0;
 }
+
+int rtlsdr_set_gpio(rtlsdr_dev_t *dev, int gpio_pin, int on)
+{
+	if (!dev)
+		return -1;
+
+	if(dev->force_bt) return 1; // If force_bt is on from the EEPROM, do not allow bias tee to turn off
+
+	rtlsdr_set_gpio_output(dev, gpio_pin);
+	rtlsdr_set_gpio_bit(dev, gpio_pin, on);
+
+	return 1;
+}
+

src/rtl_biast.c

@@ -0,0 +1,125 @@
+/*
+ * rtl-sdr, turns your Realtek RTL2832 based DVB dongle into a SDR receiver
+ * rtl_eeprom, EEPROM modification tool
+ * Copyright (C) 2012 by Steve Markgraf <steve@steve-m.de>
+ *
+ * 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/>.
+ */
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifndef _WIN32
+#include <unistd.h>
+#else
+#include <windows.h>
+#include "getopt/getopt.h"
+#endif
+
+#include "rtl-sdr.h"
+#include "convenience/convenience.h"
+
+#define EEPROM_SIZE	256
+#define MAX_STR_SIZE	256
+#define STR_OFFSET	0x09
+
+static rtlsdr_dev_t *dev = NULL;
+
+typedef struct rtlsdr_config {
+	uint16_t vendor_id;
+	uint16_t product_id;
+	char manufacturer[MAX_STR_SIZE];
+	char product[MAX_STR_SIZE];
+	char serial[MAX_STR_SIZE];
+	int have_serial;
+	int enable_ir;
+	int remote_wakeup;
+} rtlsdr_config_t;
+
+
+void usage(void)
+{
+	fprintf(stderr,
+		"rtl_biast, a tool for turning the RTL-SDR.com \n"
+		"bias tee or any GPIO ON and OFF. Example to turn on the \n"
+		"bias tee: rtl_biast -d 0 -b 1\n"
+                "Any GPIO: rtl_biast -d 0 -g 1 -b 1\n\n"
+		"Usage:\n"
+		"\t[-d device_index (default: 0)]\n"
+		"\t[-b bias_on (default: 0)]\n"
+                "\t[-g GPIO select (default: 0)]\n");
+	exit(1);
+}
+
+int main(int argc, char **argv)
+{
+	int i, r, opt;
+	int dev_index = 0;
+	int dev_given = 0;
+	uint32_t bias_on = 0;
+        uint32_t gpio_pin = 0;
+	int device_count;
+	char *filename = NULL;
+	FILE *file = NULL;
+	char *manuf_str = NULL;
+	char *product_str = NULL;
+	char *serial_str = NULL;
+	uint8_t buf[EEPROM_SIZE];
+	rtlsdr_config_t conf;
+	int flash_file = 0;
+	int default_config = 0;
+	int change = 0;
+	int ir_endpoint = 0;
+	char ch;
+
+	while ((opt = getopt(argc, argv, "d:b:g:h?")) != -1) {
+		switch (opt) {
+		case 'd':
+			dev_index = verbose_device_search(optarg);
+			dev_given = 1;
+			break;
+		case 'b':
+			bias_on = atoi(optarg);
+			break;
+                case 'g':
+                       gpio_pin = atoi(optarg);
+                       break;
+		default:
+			usage();
+			break;
+		}
+	}
+
+	if (!dev_given) {
+		dev_index = verbose_device_search("0");
+	}
+
+	if (dev_index < 0) {
+		exit(1);
+	}
+
+	r = rtlsdr_open(&dev, dev_index);
+
+        rtlsdr_set_gpio(dev, gpio_pin, bias_on);
+	//rtlsdr_set_bias_tee(dev, bias_on);
+
+	//rtlsdr_set_direct_sampling(dev, 1);
+
+exit:
+	rtlsdr_close(dev);
+
+	return r >= 0 ? r : -r;
+}
+