From cd7da974d5b6dc65d06abc6346f192ea33adbf9c Mon Sep 17 00:00:00 2001
From: Hoernchen <la@tfc-server.de>
Date: Thu, 6 Jun 2013 14:09:11 +0200
Subject: [PATCH] lib: fractional sample rates

---
 host/libhackrf/src/hackrf.c | 37 +++++++++++++++++++++++++++++++++++++
 host/libhackrf/src/hackrf.h |  1 +
 2 files changed, 38 insertions(+)

diff --git a/host/libhackrf/src/hackrf.c b/host/libhackrf/src/hackrf.c
index 67c2d97b..d8e5721c 100644
--- a/host/libhackrf/src/hackrf.c
+++ b/host/libhackrf/src/hackrf.c
@@ -57,6 +57,7 @@ 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_FRACRATE = 22,
 } hackrf_vendor_request;
 
 typedef enum {
@@ -754,6 +755,42 @@ int ADDCALL hackrf_set_freq(hackrf_device* device, const uint64_t freq_hz)
 	}
 }
 
+
+typedef struct {
+	float freq_mhz;
+} set_fracrate_params_t;
+
+
+int ADDCALL hackrf_set_fracrate(hackrf_device* device, const float freq_mhz)
+{
+	uint32_t l_freq_mhz;
+	uint32_t l_freq_hz;
+	set_fracrate_params_t set_fracrate_params;
+	uint8_t length;
+	int result;
+	
+	set_fracrate_params.freq_mhz = freq_mhz;
+	length = sizeof(set_fracrate_params_t);
+
+	result = libusb_control_transfer(
+		device->usb_device,
+		LIBUSB_ENDPOINT_OUT | LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE,
+		HACKRF_VENDOR_REQUEST_SET_FRACRATE,
+		0,
+		0,
+		(unsigned char*)&set_fracrate_params,
+		length,
+		0
+	);
+
+	if (result < length)
+	{
+		return HACKRF_ERROR_LIBUSB;
+	} else {
+		return HACKRF_SUCCESS;
+	}
+}
+
 int ADDCALL hackrf_set_amp_enable(hackrf_device* device, const uint8_t value)
 {
 	int result;
diff --git a/host/libhackrf/src/hackrf.h b/host/libhackrf/src/hackrf.h
index 14968319..96d2dcf6 100644
--- a/host/libhackrf/src/hackrf.h
+++ b/host/libhackrf/src/hackrf.h
@@ -129,6 +129,7 @@ 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_fracrate(hackrf_device* device, const float freq_mhz);
 
 /* external amp, bool on/off */
 extern ADDAPI int ADDCALL hackrf_set_amp_enable(hackrf_device* device, const uint8_t value);