From 3c7bc948f189e0c15311a3bdabea6463a4133708 Mon Sep 17 00:00:00 2001
From: Hoernchen <la@tfc-server.de>
Date: Sat, 15 Jun 2013 01:24:26 +0200
Subject: [PATCH] lib: if freq

---
 host/libhackrf/src/hackrf.c | 29 +++++++++++++++++++++++++++++
 host/libhackrf/src/hackrf.h |  1 +
 2 files changed, 30 insertions(+)

diff --git a/host/libhackrf/src/hackrf.c b/host/libhackrf/src/hackrf.c
index 4dcc9302..7e36dc55 100644
--- a/host/libhackrf/src/hackrf.c
+++ b/host/libhackrf/src/hackrf.c
@@ -64,6 +64,7 @@ typedef enum {
 	HACKRF_VENDOR_REQUEST_SET_LNA_GAIN = 19,
 	HACKRF_VENDOR_REQUEST_SET_VGA_GAIN = 20,
 	HACKRF_VENDOR_REQUEST_SET_TXVGA_GAIN = 21,
+	HACKRF_VENDOR_REQUEST_SET_IF_FREQ = 22,
 } hackrf_vendor_request;
 
 typedef enum {
@@ -958,6 +959,34 @@ int ADDCALL hackrf_set_txvga_gain(hackrf_device* device, uint32_t value)
 	}
 }
 
+int ADDCALL hackrf_set_if_freq(hackrf_device* device, const uint32_t freq_mhz)
+{
+	int result;
+
+	if(freq_mhz < 2300 || freq_mhz > 2700)
+	{
+		return HACKRF_ERROR_INVALID_PARAM;
+	}
+
+	result = libusb_control_transfer(
+		device->usb_device,
+		LIBUSB_ENDPOINT_OUT | LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE,
+		HACKRF_VENDOR_REQUEST_SET_IF_FREQ,
+		0,
+		freq_mhz,
+		NULL,
+		0,
+		0
+	);
+
+	if( result != 0 )
+	{
+		return HACKRF_ERROR_LIBUSB;
+	} else {
+		return HACKRF_SUCCESS;
+	}
+}
+
 static void* transfer_threadproc(void* arg)
 {
 	hackrf_device* device = (hackrf_device*)arg;
diff --git a/host/libhackrf/src/hackrf.h b/host/libhackrf/src/hackrf.h
index b79c7499..18671061 100644
--- a/host/libhackrf/src/hackrf.h
+++ b/host/libhackrf/src/hackrf.h
@@ -128,6 +128,7 @@ extern ADDAPI int ADDCALL hackrf_board_id_read(hackrf_device* device, uint8_t* v
 extern ADDAPI int ADDCALL hackrf_version_string_read(hackrf_device* device, char* version, uint8_t length);
 
 extern ADDAPI int ADDCALL hackrf_set_freq(hackrf_device* device, const uint64_t freq_hz);
+extern ADDAPI int ADDCALL hackrf_set_if_freq(hackrf_device* device, const uint32_t freq_mhz);
 
 /* currently 8-20Mhz - either as a fraction, i.e. freq 20000000hz divider 2 -> 10Mhz or as plain old 10000000hz (double)
 	preferred rates are 8, 10, 12.5, 16, 20Mhz due to less jitter */