hantek-dso: dso2250: It's not HORIZ_TRIGGERPOS but CAPTURE_RATIO.

Seems a bit unfortunately named; if my current guess is right,
perhaps it should be
  :%s/SR_CONF_HORIZ_TRIGGERPOS/SR_CONF_HORIZ_DISPLAYOFFSET/g

src/hardware/hantek-dso/api.c

@@ -58,7 +58,7 @@ static const uint32_t devopts[] = {
 	SR_CONF_LIMIT_FRAMES | SR_CONF_SET,
 	SR_CONF_TIMEBASE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
 	SR_CONF_NUM_HDIV | SR_CONF_GET,
-	SR_CONF_HORIZ_TRIGGERPOS | SR_CONF_GET | SR_CONF_SET,
+	SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
 	SR_CONF_TRIGGER_SOURCE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
 	SR_CONF_TRIGGER_SLOPE | SR_CONF_GET | SR_CONF_SET,
 	SR_CONF_BUFFERSIZE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
@@ -221,7 +221,7 @@ static struct sr_dev_inst *dso_dev_new(const struct dso_profile *prof)
 	devc->framesize = DEFAULT_FRAMESIZE;
 	devc->triggerslope = SLOPE_POSITIVE;
 	devc->triggersource = g_strdup(DEFAULT_TRIGGER_SOURCE);
-	devc->triggerposition = DEFAULT_HORIZ_TRIGGERPOS;
+	devc->capture_ratio = DEFAULT_CAPTURE_RATIO;
 	sdi->priv = devc;
 
 	return sdi;
@@ -467,8 +467,8 @@ static int config_get(uint32_t key, GVariant **data,
 			s = (devc->triggerslope == SLOPE_POSITIVE) ? "r" : "f";
 			*data = g_variant_new_string(s);
 			break;
-		case SR_CONF_HORIZ_TRIGGERPOS:
+		case SR_CONF_CAPTURE_RATIO:
-			*data = g_variant_new_double(devc->triggerposition);
+			*data = g_variant_new_uint64(devc->capture_ratio);
 			break;
 		default:
 			return SR_ERR_NA;
@@ -501,7 +501,7 @@ static int config_set(uint32_t key, GVariant *data,
 	const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 {
 	struct dev_context *devc;
-	double tmp_double;
+	int rat;
 	int ch_idx, idx;
 
 	devc = sdi->priv;
@@ -515,13 +515,13 @@ static int config_set(uint32_t key, GVariant *data,
 				return SR_ERR_ARG;
 			devc->triggerslope = idx;
 			break;
-		case SR_CONF_HORIZ_TRIGGERPOS:
+		case SR_CONF_CAPTURE_RATIO:
-			tmp_double = g_variant_get_double(data);
+			rat = g_variant_get_uint64(data);
-			if (tmp_double < 0.0 || tmp_double > 1.0) {
+			if (rat < 0 || rat > 100) {
-				sr_err("Trigger position should be between 0.0 and 1.0.");
+				sr_err("Capture ratio must be in [0,100].");
 				return SR_ERR_ARG;
 			} else
-				devc->triggerposition = tmp_double;
+				devc->capture_ratio = rat;
 			break;
 		case SR_CONF_BUFFERSIZE:
 			if ((idx = std_u64_idx(data, devc->profile->buffersizes, NUM_BUFFER_SIZES)) < 0)
@@ -539,6 +539,7 @@ static int config_set(uint32_t key, GVariant *data,
 			devc->samplerate = samplerates[idx];
 			if (dso_set_trigger_samplerate(sdi) != SR_OK)
 				return SR_ERR;
+			sr_dbg("got new sample rate %d, idx %d", devc->samplerate, idx);
 			break;
 		case SR_CONF_TRIGGER_SOURCE:
 			if ((idx = std_str_idx(data, ARRAY_AND_SIZE(trigger_sources))) < 0)

src/hardware/hantek-dso/protocol.c

@@ -241,6 +241,25 @@ static int get_channel_offsets(const struct sr_dev_inst *sdi)
 	return SR_OK;
 }
 
+
+static void dso2250_set_triggerpos(int value, int long_buffer, uint8_t dest[], int offset)
+{
+	uint32_t min, max;
+	uint32_t tmp, diff;
+
+	min = long_buffer ? 0 : 0x7d7ff;
+	max = 0x7ffff;
+
+	diff = max - min;
+	tmp = min + diff * value / 100;
+	sr_dbg("2250 trigger pos: %3d%% * [0x%x,0x%x] == 0x%x", value, min, max, tmp);
+
+	dest[offset + 0] = tmp & 0xff;
+	dest[offset + 1] = (tmp >> 8) & 0xff;
+	dest[offset + 2] = (tmp >> 16) & 0x7;
+}
+
+
 /* See http://openhantek.sourceforge.net/doc/namespaceHantek.html#ac1cd181814cf3da74771c29800b39028 */
 static int dso2250_set_trigger_samplerate(const struct sr_dev_inst *sdi)
 {
@@ -249,6 +268,7 @@ static int dso2250_set_trigger_samplerate(const struct sr_dev_inst *sdi)
 	int ret, tmp;
 	int base;
 	uint8_t cmdstring[12];
+	int trig;
 
 
 	devc = sdi->priv;
@@ -365,20 +385,12 @@ static int dso2250_set_trigger_samplerate(const struct sr_dev_inst *sdi)
 	memset(cmdstring, 0, sizeof(cmdstring));
 	cmdstring[0] = CMD_2250_SET_TRIGGERPOS_AND_BUFFER;
 
-	/* TODO for big buffer */
+	sr_dbg("Capture ratio: %d.", devc->capture_ratio);
-	sr_dbg("Trigger position: %3.2f.", devc->triggerposition);
+	trig = devc->capture_ratio;
-//	tmp = 0x77fff + 0x8000 * devc->triggerposition;
+	dso2250_set_triggerpos(trig,
-//	cmdstring[6] = tmp & 0xff;
+			devc->framesize != FRAMESIZE_SMALL, cmdstring, 2);
-//	cmdstring[7] = (tmp >> 8) & 0xff;
+	dso2250_set_triggerpos(100 - trig,
-//	cmdstring[10] = (tmp >> 16) & 0xff;
+			devc->framesize != FRAMESIZE_SMALL, cmdstring, 6);
-
-	cmdstring[2]=0xff;
-	cmdstring[3]=0xff;
-	cmdstring[4]=0x07;
-
-	cmdstring[6]=0xff;
-	cmdstring[7]=0xd7;
-	cmdstring[8]=0x07;
 
 	if (send_begin(sdi) != SR_OK)
 		return SR_ERR;
@@ -494,8 +506,8 @@ int dso_set_trigger_samplerate(const struct sr_dev_inst *sdi)
 	cmdstring[5] = (tmp >> 8) & 0xff;
 
 	/* Horizontal trigger position */
-	sr_dbg("Trigger position: %3.2f.", devc->triggerposition);
+	sr_dbg("Capture ratio: %d.", devc->capture_ratio);
-	tmp = 0x77fff + 0x8000 * devc->triggerposition;
+	tmp = 0x77fff + 0x8000 * devc->capture_ratio / 100;
 	cmdstring[6] = tmp & 0xff;
 	cmdstring[7] = (tmp >> 8) & 0xff;
 	cmdstring[10] = (tmp >> 16) & 0xff;

src/hardware/hantek-dso/protocol.h

@@ -40,7 +40,7 @@
 #define DEFAULT_SAMPLERATE      SR_KHZ(10)
 #define DEFAULT_TRIGGER_SOURCE  "CH1"
 #define DEFAULT_COUPLING        COUPLING_DC
-#define DEFAULT_HORIZ_TRIGGERPOS 0.5
+#define DEFAULT_CAPTURE_RATIO   100
 #define DEFAULT_VERT_OFFSET     0.5
 #define DEFAULT_VERT_TRIGGERPOS 0.5
 
@@ -202,7 +202,7 @@ struct dev_context {
 	gboolean filter[2];
 	int triggerslope;
 	char *triggersource;
-	float triggerposition;
+	int capture_ratio;
 	int triggermode;
 
 	/* Frame transfer */