Merge pull request #76 from smunaut/pending

Final (hopefully) sample rate API + misc fixes

firmware/common/Makefile_inc.mk

@@ -54,8 +54,8 @@ CFLAGS += -std=gnu99 -Os -g3 -Wall -Wextra -I$(LIBOPENCM3)/include -I../common \
 		-fno-common -mcpu=cortex-m4 -mthumb -MD \
 		-mfloat-abi=hard -mfpu=fpv4-sp-d16 \
 		$(HACKRF_OPTS)
-LDFLAGS += -L$(TOOLCHAIN_DIR)/lib/armv7e-m/fpu \
+LDFLAGS += -mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16 \
-    -L../common \
+		-L$(TOOLCHAIN_DIR)/lib/armv7e-m/fpu -L../common \
 		-L$(LIBOPENCM3)/lib -L$(LIBOPENCM3)/lib/lpc43xx \
 		-T$(LDSCRIPT) -nostartfiles \
 		-Wl,--gc-sections -Xlinker -Map=$(BINARY).map

firmware/common/hackrf_core.c

@@ -39,59 +39,90 @@ void delay(uint32_t duration)
 		__asm__("nop");
 }
 
-bool set_fracrate(const float freq) {
+/* GCD algo from wikipedia */
+/* http://en.wikipedia.org/wiki/Greatest_common_divisor */
+static uint32_t
+gcd(uint32_t u, uint32_t v)
+{
+	int s;
 
+	if (!u || !v)
+		return u | v;
+
+	for (s=0; !((u|v)&1); s++) {
+		u >>= 1;
+		v >>= 1;
+	}
+
+	while (!(u&1))
+		u >>= 1;
+
+	do {
+		while (!(v&1))
+			v >>= 1;
+
+		if (u>v) {
+			uint32_t t;
+			t = v;
+			v = u;
+			u = t;
+		}
+
+		v = v - u;
+	}
+	while (v);
+
+	return u << s;
+}
+
+bool sample_rate_frac_set(uint32_t rate_num, uint32_t rate_denom)
+{
+	const uint64_t VCO_FREQ = 800 * 1000 * 1000; /* 800 MHz */
 	uint32_t MSx_P1,MSx_P2,MSx_P3;
-	uint32_t b,c;
+	uint32_t a, b, c;
-	float div = (800/freq);
+	uint32_t rem;
-	uint32_t a = (uint32_t)div;
-	float x = div-a;
 
-	if(a != div){
+	/* Find best config */
-		uint32_t j=0,k=1,l=1,m=1;
+	a = (VCO_FREQ * rate_denom) / rate_num;
 
-        si5351c_set_int_mode(0, 0);
+	rem = (VCO_FREQ * rate_denom) - (a * rate_num);
 
-		while (k <= 0xFFFF && m <= 0xFFFF){
+	if (!rem) {
-			float n = (float)(j+l)/(k+m);
+		/* Integer mode */
-			if( x == n){
+		b = 0;
-				if(k + m <= 0xFFFF){
+		c = 1;
-					b=j+l;	c=k+m;
-					break;
-				} else if(m > k){
-					b=l; c=m;
-					break;
 	} else {
-					b=j; c=k;
+		/* Fractional */
-					break;
+		uint32_t g = gcd(rem, rate_num);
-				}
+		rem /= g;
-			}
+		rate_num /= g;
-			else if(x > n){
+
-				j+=l; k+=m;
+		if (rate_num < (1<<20)) {
-			}
+			/* Perfect match */
-			else{
+			b = rem;
-				l+=j; m+=k;
+			c = rate_num;
-			}
-		}
-		if (k > 0xFFFF){
-			b=l; c=m;
-		}
-		else{
-			b=j; c=k;
-		}
 		} else {
-        if(a & 0x1) // odd integer, needs frac mode
+			/* Approximate */
+			c = (1<<20) - 1;
+			b = ((uint64_t)c * (uint64_t)rem) / rate_num;
+
+			g = gcd(b, c);
+			b /= g;
+			c /= g;
+		}
+	}
+
+	/* Can we enable integer mode ? */
+	if (a & 0x1 || b)
 		si5351c_set_int_mode(0, 0);
 	else
 		si5351c_set_int_mode(0, 1);
-		b=0; c=1;
-	}
 
+	/* Final MS values */
 	MSx_P1 = 128*a + (128 * b/c) - 512;
 	MSx_P2 = (128*b) % c;
 	MSx_P3 = c;
 
-	
 	/* MS0/CLK0 is the source for the MAX5864/CPLD (CODEC_CLK). */
 	si5351c_configure_multisynth(0, MSx_P1, MSx_P2, MSx_P3, 1);
 
@@ -105,10 +136,8 @@ bool set_fracrate(const float freq) {
 	//si5351c_configure_multisynth(3, p1, 0, 1, 0); // no clk out
 
 	return true;
-
 }
 
-
 bool sample_rate_set(const uint32_t sample_rate_hz) {
 #ifdef JELLYBEAN
 	/* Due to design issues, Jellybean/Lemondrop frequency plan is limited.

firmware/common/hackrf_core.h

@@ -259,7 +259,7 @@ void pin_setup(void);
 
 void enable_1v8_power(void);
 
-bool set_fracrate(const float sampling_rate_mhz);
+bool sample_rate_frac_set(uint32_t rate_num, uint32_t rate_denom);
 bool sample_rate_set(const uint32_t sampling_rate_hz);
 bool baseband_filter_bandwidth_set(const uint32_t bandwidth_hz);
 

firmware/hackrf_usb/hackrf_usb.c

@@ -68,7 +68,8 @@ typedef struct {
 set_freq_params_t set_freq_params;
 
 typedef struct {
-	float freq_mhz;
+	uint32_t freq_hz;
+	uint32_t divider;
 } set_sample_r_params_t;
 
 set_sample_r_params_t set_sample_r_params;
@@ -425,22 +426,6 @@ usb_request_status_t usb_vendor_request_read_si5351c(
 	}
 }
 
-usb_request_status_t usb_vendor_request_set_sample_rate(
-	usb_endpoint_t* const endpoint,
-	const usb_transfer_stage_t stage
-) {
-	if( stage == USB_TRANSFER_STAGE_SETUP ) {
-		const uint32_t sample_rate = (endpoint->setup.index << 16) | endpoint->setup.value;
-		if( sample_rate_set(sample_rate) ) {
-			usb_endpoint_schedule_ack(endpoint->in);
-			return USB_REQUEST_STATUS_OK;
-		}
-		return USB_REQUEST_STATUS_STALL;
-	} else {
-		return USB_REQUEST_STATUS_OK;
-	}
-}
-
 usb_request_status_t usb_vendor_request_set_baseband_filter_bandwidth(
 	usb_endpoint_t* const endpoint,
 	const usb_transfer_stage_t stage
@@ -702,7 +687,7 @@ usb_request_status_t usb_vendor_request_set_freq(
 	}
 }
 
-usb_request_status_t usb_vendor_request_set_fracrate(
+usb_request_status_t usb_vendor_request_set_sample_rate_frac(
 	usb_endpoint_t* const endpoint,
 	const usb_transfer_stage_t stage) 
 {
@@ -712,7 +697,7 @@ usb_request_status_t usb_vendor_request_set_fracrate(
 		return USB_REQUEST_STATUS_OK;
 	} else if (stage == USB_TRANSFER_STAGE_DATA) 
 	{
-		if( set_fracrate(set_sample_r_params.freq_mhz*2) ) 
+		if( sample_rate_frac_set(set_sample_r_params.freq_hz * 2, set_sample_r_params.divider ) )
 		{
 			usb_endpoint_schedule_ack(endpoint->in);
 			return USB_REQUEST_STATUS_OK;
@@ -834,7 +819,7 @@ static const usb_request_handler_fn vendor_request_handler[] = {
 	usb_vendor_request_read_max2837,
 	usb_vendor_request_write_si5351c,
 	usb_vendor_request_read_si5351c,
-	usb_vendor_request_set_sample_rate,
+	usb_vendor_request_set_sample_rate_frac,
 	usb_vendor_request_set_baseband_filter_bandwidth,
 	usb_vendor_request_write_rffc5071,
 	usb_vendor_request_read_rffc5071,
@@ -850,7 +835,6 @@ static const usb_request_handler_fn vendor_request_handler[] = {
 	usb_vendor_request_set_lna_gain,
 	usb_vendor_request_set_vga_gain,
 	usb_vendor_request_set_txvga_gain,
-	usb_vendor_request_set_fracrate
 };
 
 static const uint32_t vendor_request_handler_count =

host/hackrf-tools/src/hackrf_si5351c.c

@@ -121,17 +121,17 @@ int dump_multisynth_config(hackrf_device* device, const uint_fast8_t ms_number)
 		}
 
 		p1 =
-			  (parameters[2] & 0x03 << 16)
+			  ((parameters[2] & 0x03) << 16)
 			| (parameters[3] << 8)
 			| parameters[4]
 			;
 		p2 =
-			  (parameters[5] & 0x0F << 16)
+			  ((parameters[5] & 0x0F) << 16)
 			| (parameters[6] << 8)
 			| parameters[7]
 			;
 		p3 =
-			  (parameters[5] & 0xF0 << 12)
+			  ((parameters[5] & 0xF0) << 12)
 			| (parameters[0] << 8)
 			|  parameters[1]
 			;
@@ -143,7 +143,7 @@ int dump_multisynth_config(hackrf_device* device, const uint_fast8_t ms_number)
 		printf("\tp2 = %u\n", p2);
 		printf("\tp3 = %u\n", p3);
 		if(p3)
-			printf("\tOutput (800Mhz PLL): %#.10f Mhz\n", (800 / (float)((p1*p3 + p2 + 512*p3)/(128*p3))) / div_lut[r_div] );
+			printf("\tOutput (800Mhz PLL): %#.10f Mhz\n", ((double)800 / (double)(((double)p1*p3 + p2 + 512*p3)/(double)(128*p3))) / div_lut[r_div] );
 	} else {
 		// MS6 and 7 are integer only
 		unsigned int parms;
@@ -157,7 +157,7 @@ int dump_multisynth_config(hackrf_device* device, const uint_fast8_t ms_number)
 			}
 		}
 
-		r_div = (ms_number == 6) ? parameters[2] & 0x7 : parameters[2] & 0x70 >> 4 ;
+		r_div = (ms_number == 6) ? parameters[2] & 0x7 : (parameters[2] & 0x70) >> 4 ;
 		parms = (ms_number == 6) ? parameters[0] : parameters[1];
 		printf("\tp1_int = %u\n", parms);
 		if(parms)

host/hackrf-tools/src/hackrf_transfer.c

@@ -591,7 +591,7 @@ int main(int argc, char** argv) {
 	signal(SIGABRT, &sigint_callback_handler);
 #endif
 	printf("call hackrf_sample_rate_set(%u Hz/%.03f MHz)\n", sample_rate_hz,((float)sample_rate_hz/(float)FREQ_ONE_MHZ));
-	result = hackrf_sample_rate_set(device, sample_rate_hz);
+	result = hackrf_set_sample_rate_manual(device, sample_rate_hz, 1);
 	if( result != HACKRF_SUCCESS ) {
 		printf("hackrf_sample_rate_set() failed: %s (%d)\n", hackrf_error_name(result), result);
 		usage();
@@ -600,7 +600,7 @@ int main(int argc, char** argv) {
 
 	printf("call hackrf_baseband_filter_bandwidth_set(%d Hz/%.03f MHz)\n",
 			baseband_filter_bw_hz, ((float)baseband_filter_bw_hz/(float)FREQ_ONE_MHZ));
-	result = hackrf_baseband_filter_bandwidth_set(device, baseband_filter_bw_hz);
+	result = hackrf_set_baseband_filter_bandwidth(device, baseband_filter_bw_hz);
 	if( result != HACKRF_SUCCESS ) {
 		printf("hackrf_baseband_filter_bandwidth_set() failed: %s (%d)\n", hackrf_error_name(result), result);
 		usage();

host/libhackrf/src/hackrf.c

@@ -64,7 +64,6 @@ 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 {
@@ -473,29 +472,7 @@ int ADDCALL hackrf_si5351c_write(hackrf_device* device, uint16_t register_number
 	}
 }
 
-int ADDCALL hackrf_sample_rate_set(hackrf_device* device, const uint32_t sampling_rate_hz)
+int ADDCALL hackrf_set_baseband_filter_bandwidth(hackrf_device* device, const uint32_t bandwidth_hz)
-{
-	int result;
-	result = libusb_control_transfer(
-		device->usb_device,
-		LIBUSB_ENDPOINT_OUT | LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE,
-		HACKRF_VENDOR_REQUEST_SAMPLE_RATE_SET,
-		sampling_rate_hz & 0xffff,
-		sampling_rate_hz >> 16,
-		NULL,
-		0,
-		0
-	);
-
-	if( result != 0 )
-	{
-		return HACKRF_ERROR_LIBUSB;
-	} else {
-		return HACKRF_SUCCESS;
-	}
-}
-
-int ADDCALL hackrf_baseband_filter_bandwidth_set(hackrf_device* device, const uint32_t bandwidth_hz)
 {
 	int result;
 	result = libusb_control_transfer(
@@ -764,23 +741,26 @@ int ADDCALL hackrf_set_freq(hackrf_device* device, const uint64_t freq_hz)
 
 
 typedef struct {
-	float freq_mhz;
+	uint32_t freq_hz;
+	uint32_t divider;
 } set_fracrate_params_t;
 
 
-int ADDCALL hackrf_set_fracrate(hackrf_device* device, const float freq_mhz)
+int ADDCALL hackrf_set_sample_rate_manual(hackrf_device* device,
+                                       const uint32_t freq_hz, uint32_t divider)
 {
 	set_fracrate_params_t set_fracrate_params;
 	uint8_t length;
 	int result;
 
-	set_fracrate_params.freq_mhz = TO_LE(freq_mhz);
+	set_fracrate_params.freq_hz = TO_LE(freq_hz);
+	set_fracrate_params.divider = TO_LE(divider);
 	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,
+		HACKRF_VENDOR_REQUEST_SAMPLE_RATE_SET,
 		0,
 		0,
 		(unsigned char*)&set_fracrate_params,
@@ -796,6 +776,41 @@ int ADDCALL hackrf_set_fracrate(hackrf_device* device, const float freq_mhz)
 	}
 }
 
+int ADDCALL hackrf_set_sample_rate(hackrf_device* device, const double freq)
+{
+	const int MAX_N = 32;
+	uint32_t freq_hz, divider;
+	double freq_frac = 1.0 + freq - (int)freq;
+	uint64_t v, a, m;
+	int i, e;
+
+	v = *((uint64_t*)&freq);
+	e = (v >> 52) - 1023;
+
+	m = ((1ULL << 52) - 1);
+
+	v = *((uint64_t*)&freq_frac);
+	v &= m;
+
+	m &= ~((1 << (e+4)) - 1);
+
+	a = 0;
+
+	for (i=1; i<MAX_N; i++) {
+		a += v;
+		if (!(a & m) || !(~a & m))
+			break;
+	}
+
+	if (i == MAX_N)
+		i = 1;
+
+	freq_hz = (uint32_t)(freq * i + 0.5);
+	divider = i;
+
+	return hackrf_set_sample_rate_manual(device, freq_hz, divider);
+}
+
 int ADDCALL hackrf_set_amp_enable(hackrf_device* device, const uint8_t value)
 {
 	int result;

host/libhackrf/src/hackrf.h

@@ -112,8 +112,7 @@ extern ADDAPI int ADDCALL hackrf_max2837_write(hackrf_device* device, uint8_t re
 extern ADDAPI int ADDCALL hackrf_si5351c_read(hackrf_device* device, uint16_t register_number, uint16_t* value);
 extern ADDAPI int ADDCALL hackrf_si5351c_write(hackrf_device* device, uint16_t register_number, uint16_t value);
  
-extern ADDAPI int ADDCALL hackrf_sample_rate_set(hackrf_device* device, const uint32_t sampling_rate_hz);
+extern ADDAPI int ADDCALL hackrf_set_baseband_filter_bandwidth(hackrf_device* device, const uint32_t bandwidth_hz);
-extern ADDAPI int ADDCALL hackrf_baseband_filter_bandwidth_set(hackrf_device* device, const uint32_t bandwidth_hz);
  
 extern ADDAPI int ADDCALL hackrf_rffc5071_read(hackrf_device* device, uint8_t register_number, uint16_t* value);
 extern ADDAPI int ADDCALL hackrf_rffc5071_write(hackrf_device* device, uint8_t register_number, uint16_t value);
@@ -129,7 +128,11 @@ 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);
+
+/* 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 */
+extern ADDAPI int ADDCALL hackrf_set_sample_rate_manual(hackrf_device* device, const uint32_t freq_hz, const uint32_t divider);
+extern ADDAPI int ADDCALL hackrf_set_sample_rate(hackrf_device* device, const double freq_hz);
 
 /* external amp, bool on/off */
 extern ADDAPI int ADDCALL hackrf_set_amp_enable(hackrf_device* device, const uint8_t value);