Draft in progress (not tested at all) set_freq().

firmware/common/hackrf_core.c

@@ -1,6 +1,7 @@
 /*
  * Copyright 2012 Michael Ossmann <mike@ossmann.com>
  * Copyright 2012 Jared Boone <jared@sharebrained.com>
+ * Copyright 2013 Benjamin Vernoux <titanmkd@gmail.com>
  *
  * This file is part of HackRF.
  *
@@ -23,12 +24,28 @@
 #include "hackrf_core.h"
 #include "si5351c.h"
 #include "max2837.h"
+#include "rffc5071.h"
 #include <libopencm3/lpc43xx/i2c.h>
 #include <libopencm3/lpc43xx/cgu.h>
 #include <libopencm3/lpc43xx/gpio.h>
 #include <libopencm3/lpc43xx/scu.h>
 #include <libopencm3/lpc43xx/ssp.h>
 
+/* Define for set_tune_freq() */
+#define FREQ_ONE_MHZ	 (1000*1000)
+
+#define MIN_LP_FREQ_MHZ (30)
+#define MAX_LP_FREQ_MHZ (2300)
+
+#define MIN_BYPASS_FREQ_MHZ (2300)
+#define MAX_BYPASS_FREQ_MHZ (2700)
+
+#define MIN_HP_FREQ_MHZ (2700)
+#define MAX_HP_FREQ_MHZ (6000)
+
+#define MAX2837_FREQ_NOMINAL_HZ (2600000000)
+#define MAX2837_FREQ_NOMINAL_MHZ (MAX2837_FREQ_NOMINAL_HZ / FREQ_ONE_MHZ)
+
 void delay(uint32_t duration)
 {
 	uint32_t i;
@@ -391,3 +408,76 @@ void pin_setup(void) {
 void enable_1v8_power(void) {
 	gpio_set(PORT_EN1V8, PIN_EN1V8);
 }
+
+/* 
+Set freq/tuning between 30MHz to 6000 MHz
+hz between 0 to 999999 Hz (not checked)
+return false on error or true if success.
+*/
+bool set_freq(uint32_t freq_mhz, uint32_t freq_hz)
+{
+	bool success;
+	uint32_t RFFC5071_freq_mhz;
+	uint32_t MAX2837_freq_hz;
+	uint32_t real_RFFC5071_freq_mhz;
+	uint32_t tmp_hz;
+
+	success = true;
+	
+	if(freq_mhz >= MIN_LP_FREQ_MHZ)
+	{
+		if(freq_mhz < MAX_LP_FREQ_MHZ)
+		{
+			/* TODO fix/check Switch to LP mode (shall not change RX/TX mode) */
+			rffc5071_set_gpo(0); /* SWITCHCTRL_LP = 0 */
+			
+			RFFC5071_freq_mhz = MAX2837_FREQ_NOMINAL_MHZ - freq_mhz;
+			/* Set Freq and read real freq */
+			real_RFFC5071_freq_mhz = rffc5071_set_frequency(RFFC5071_freq_mhz, 0);
+			if(real_RFFC5071_freq_mhz < RFFC5071_freq_mhz)
+			{
+				tmp_hz = -((RFFC5071_freq_mhz - real_RFFC5071_freq_mhz) * FREQ_ONE_MHZ);
+			}else
+			{
+				tmp_hz = ((real_RFFC5071_freq_mhz - RFFC5071_freq_mhz) * FREQ_ONE_MHZ);
+			}
+			MAX2837_freq_hz = MAX2837_FREQ_NOMINAL_HZ + tmp_hz + freq_hz;
+			max2837_set_frequency(MAX2837_freq_hz);
+		}else if( (freq_mhz >= MIN_BYPASS_FREQ_MHZ) && (freq_mhz < MAX_BYPASS_FREQ_MHZ) )
+		{
+			/* TODO fix/check Switch to SWITCHCTRL_MIX_BYPASS mode (shall not change RX/TX mode) */
+			rffc5071_set_gpo(SWITCHCTRL_MIX_BYPASS);
+
+			MAX2837_freq_hz = (freq_mhz * FREQ_ONE_MHZ) + freq_hz;
+			/* RFFC5071_freq_mhz <= not used in Bypass mode */
+			max2837_set_frequency(MAX2837_freq_hz);
+		}else if(  (freq_mhz >= MIN_HP_FREQ_MHZ) && (freq_mhz < MAX_HP_FREQ_MHZ) )
+		{
+			/* TODO fix/check Switch to SWITCHCTRL_HP mode (shall not change RX/TX mode) */
+			rffc5071_set_gpo(SWITCHCTRL_HP);
+			
+			//switch_ctrl = SWITCHCTRL_HP;
+			RFFC5071_freq_mhz = freq_mhz - MAX2837_FREQ_NOMINAL_MHZ;
+			/* Set Freq and read real freq */
+			real_RFFC5071_freq_mhz = rffc5071_set_frequency(RFFC5071_freq_mhz, 0);
+			if(real_RFFC5071_freq_mhz < RFFC5071_freq_mhz)
+			{
+				tmp_hz = ((RFFC5071_freq_mhz - real_RFFC5071_freq_mhz) * FREQ_ONE_MHZ);
+			}else
+			{
+				tmp_hz = -((real_RFFC5071_freq_mhz - RFFC5071_freq_mhz) * FREQ_ONE_MHZ);
+			}
+			MAX2837_freq_hz = MAX2837_FREQ_NOMINAL_HZ + tmp_hz + freq_hz;
+			max2837_set_frequency(MAX2837_freq_hz);
+		}else
+		{
+			/* Error freq_mhz too high */
+			success = false;
+		}
+	}else
+	{
+		/* Error freq_mhz too low */
+		success = false;		
+	}
+	return success;
+}

firmware/common/hackrf_core.h

@@ -258,6 +258,8 @@ void enable_1v8_power(void);
 bool sample_rate_set(const uint32_t sampling_rate_hz);
 bool baseband_filter_bandwidth_set(const uint32_t bandwidth_hz);
 
+bool set_freq(uint32_t freq_mhz, uint32_t freq_hz);
+
 #ifdef __cplusplus
 }
 #endif

firmware/usb_performance/usb_performance.c

@@ -491,6 +491,23 @@ usb_request_status_t usb_vendor_request_read_version_string(
 	return USB_REQUEST_STATUS_OK;
 }
 
+usb_request_status_t usb_vendor_request_set_freq(
+	usb_endpoint_t* const endpoint,
+	const usb_transfer_stage_t stage
+) {
+	if( stage == USB_TRANSFER_STAGE_SETUP ) {
+		const uint32_t freq_mhz = (endpoint->setup.index << 16) | endpoint->setup.value;
+		const uint32_t freq_hz = 0; /* TODO fix this and retrieve a 32bits */
+		if( set_freq(freq_mhz, freq_hz) ) {
+			usb_endpoint_schedule_ack(endpoint->in);
+			return USB_REQUEST_STATUS_OK;
+		}
+		return USB_REQUEST_STATUS_STALL;
+	} else {
+		return USB_REQUEST_STATUS_OK;
+	}
+}
+
 static const usb_request_handler_fn vendor_request_handler[] = {
 	NULL,
 	usb_vendor_request_set_transceiver_mode,
@@ -507,7 +524,8 @@ static const usb_request_handler_fn vendor_request_handler[] = {
 	usb_vendor_request_read_spiflash,
 	usb_vendor_request_write_cpld,
 	usb_vendor_request_read_board_id,
-	usb_vendor_request_read_version_string
+	usb_vendor_request_read_version_string,
+	usb_vendor_request_set_freq
 };
 
 static const uint32_t vendor_request_handler_count =

host/libhackrf/examples/hackrf_transfer.c

@@ -42,6 +42,9 @@
 #include <sys/time.h>
 #include <signal.h>
 
+#define FREQ_MIN_MHZ	(30)
+#define FREQ_MAX_MHZ	(6000)
+
 #if defined _WIN32
 	#define sleep(a) Sleep( (a*1000) )
 #endif
@@ -59,6 +62,30 @@ TimevalDiff(const struct timeval *a, const struct timeval *b)
    return (a->tv_sec - b->tv_sec) + 1e-6f * (a->tv_usec - b->tv_usec);
 }
 
+int parse_int(char* s, uint32_t* const value) {
+	uint_fast8_t base = 10;
+	if( strlen(s) > 2 ) {
+		if( s[0] == '0' ) {
+			if( (s[1] == 'x') || (s[1] == 'X') ) {
+				base = 16;
+				s += 2;
+			} else if( (s[1] == 'b') || (s[1] == 'B') ) {
+				base = 2;
+				s += 2;
+			}
+		}
+	}
+
+	char* s_end = s;
+	const unsigned long ulong_value = strtoul(s, &s_end, base);
+	if( (s != s_end) && (*s_end == 0) ) {
+		*value = ulong_value;
+		return HACKRF_SUCCESS;
+	} else {
+		return HACKRF_ERROR_INVALID_PARAM;
+	}
+}
+
 FILE* fd = NULL;
 volatile uint32_t byte_count = 0;
 
@@ -67,6 +94,9 @@ bool transmit = false;
 struct timeval time_start;
 struct timeval t_start;
 	
+bool freq = false;
+uint32_t freq_mhz;
+	
 int rx_callback(hackrf_transfer* transfer) {
 	if( fd != NULL ) 
 	{
@@ -105,6 +135,7 @@ static void usage() {
 	printf("Usage:\n");
 	printf("\t-r <filename> # Receive data into file.\n");
 	printf("\t-t <filename> # Transmit data from file.\n");
+	printf("\t-f <set_freq_MHz> # Set Frequency in MHz (between [%ld, %ld[).\n", FREQ_MIN_MHZ, FREQ_MAX_MHZ);
 }
 
 static hackrf_device* device = NULL;
@@ -168,8 +199,10 @@ void sigint_callback_handler(int signum)
 int main(int argc, char** argv) {
 	int opt;
 	const char* path = NULL;
+	int result;
 	
-	while( (opt = getopt(argc, argv, "r:t:")) != EOF ) {
+	while( (opt = getopt(argc, argv, "r:t:f:")) != EOF ) {
+		result = HACKRF_SUCCESS;
 		switch( opt ) {
 		case 'r':
 			receive = true;
@@ -181,10 +214,26 @@ int main(int argc, char** argv) {
 			path = optarg;
 			break;
 		
+		case 'f':
+			freq = true;
+			result = parse_int(optarg, &freq_mhz);
+			break;
+			
 		default:
 			usage();
 			return EXIT_FAILURE;
 		}
+		
+		if( result != HACKRF_SUCCESS ) {
+			printf("argument error: %s (%d)\n", hackrf_error_name(result), result);
+			usage();
+			break;
+		}		
+	}
+
+	if( freq ) {
+		if( (freq_mhz >= 6000) || (freq_mhz < 30) )
+			printf("argument error: frequency shall be between [%ld, %ld[.\n", FREQ_MIN_MHZ, FREQ_MAX_MHZ);
 	}
 	
 	if( transmit == receive ) 
@@ -213,7 +262,7 @@ int main(int argc, char** argv) {
 		return EXIT_FAILURE;
 	}
 	
-	int result = hackrf_init();
+	result = hackrf_init();
 	if( result != HACKRF_SUCCESS ) {
 		printf("hackrf_init() failed: %s (%d)\n", hackrf_error_name(result), result);
 		usage();
@@ -262,6 +311,15 @@ int main(int argc, char** argv) {
 		return EXIT_FAILURE;
 	}
 
+	if( freq ) {
+		printf("call hackrf_set_freq(%ld MHz)\n", freq_mhz);
+		result = hackrf_set_freq(device, freq_mhz);
+		if( result != HACKRF_SUCCESS ) {
+			printf("hackrf_set_freq() failed: %s (%d)\n", hackrf_error_name(result), result);
+			return EXIT_FAILURE;
+		}
+	}
+	
 	gettimeofday(&t_start, NULL);
 	gettimeofday(&time_start, NULL);
 

host/libhackrf/src/hackrf.c

@@ -44,7 +44,8 @@ typedef enum {
 	HACKRF_VENDOR_REQUEST_SPIFLASH_READ = 12,
 	HACKRF_VENDOR_REQUEST_CPLD_WRITE = 13,
 	HACKRF_VENDOR_REQUEST_BOARD_ID_READ = 14,
-	HACKRF_VENDOR_REQUEST_VERSION_STRING_READ = 15
+	HACKRF_VENDOR_REQUEST_VERSION_STRING_READ = 15,
+	HACKRF_VENDOR_REQUEST_SET_FREQ = 16
 } hackrf_vendor_request;
 
 typedef enum {
@@ -569,6 +570,26 @@ int hackrf_version_string_read(hackrf_device* device, char* version,
 	}
 }
 
+int hackrf_set_freq(hackrf_device* device, const uint32_t freq_mhz) {
+	/* TODO add freq_hz in addition from 0 to 999999Hz */
+	int result = libusb_control_transfer(
+		device->usb_device,
+		LIBUSB_ENDPOINT_OUT | LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE,
+		HACKRF_VENDOR_REQUEST_SET_FREQ,
+		freq_mhz & 0xffff,
+		freq_mhz >> 16,
+		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;
 	

host/libhackrf/src/hackrf.h

@@ -93,6 +93,8 @@ int hackrf_board_id_read(hackrf_device* device, uint8_t* value);
 int hackrf_version_string_read(hackrf_device* device, char* version,
 		uint8_t length);
 
+int hackrf_set_freq(hackrf_device* device, const uint32_t freq_mhz);
+		
 const char* hackrf_error_name(enum hackrf_error errcode);
 const char* hackrf_board_id_name(enum hackrf_board_id board_id);