X-Git-Url: http://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Fhardware%2Fdemo%2Fprotocol.c;h=a969d02995cb661c35ff54bf2891fbc018a1f28d;hb=78d78afb572ca8fe0321cf6d5e2c3e4a5b32a04d;hp=42348a374f224d234a1bf4d6612bae45a53b43f6;hpb=a6e5d2f676d2887978f193be2e6bb451185ba36d;p=libsigrok.git

diff --git a/src/hardware/demo/protocol.c b/src/hardware/demo/protocol.c
index 42348a37..a969d029 100644
--- a/src/hardware/demo/protocol.c
+++ b/src/hardware/demo/protocol.c
@@ -187,12 +187,14 @@ SR_PRIV void demo_generate_analog_pattern(struct dev_context *devc)
 	amplitude = DEFAULT_ANALOG_AMPLITUDE;
 	offset = DEFAULT_ANALOG_OFFSET;
 
-	/* FIXME we actually need only one period. A ringbuffer would be
-	 * useful here. */
-	/* Make sure the number of samples we put out is an integer
-	 * multiple of our period size */
+	/*
+	 * FIXME: We actually need only one period. A ringbuffer would be
+	 * useful here.
+	 * Make sure the number of samples we put out is an integer
+	 * multiple of our period size.
+	 */
 
-	/* PATTERN_SQUARE */
+	/* PATTERN_SQUARE: */
 	sr_dbg("Generating %s pattern.", analog_pattern_str[PATTERN_SQUARE]);
 	pattern = g_malloc(sizeof(struct analog_pattern));
 	value = amplitude;
@@ -207,7 +209,7 @@ SR_PRIV void demo_generate_analog_pattern(struct dev_context *devc)
 	pattern->num_samples = last_end;
 	devc->analog_patterns[PATTERN_SQUARE] = pattern;
 
-	/*  Readjusting num_samples for all other patterns */
+	/* Readjusting num_samples for all other patterns. */
 	while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
 		num_samples--;
 
@@ -242,6 +244,21 @@ SR_PRIV void demo_generate_analog_pattern(struct dev_context *devc)
 	}
 	pattern->num_samples = last_end;
 	devc->analog_patterns[PATTERN_SAWTOOTH] = pattern;
+
+	/* PATTERN_ANALOG_RANDOM */
+	/* Data not filled here, will be generated in send_analog_packet(). */
+	pattern = g_malloc(sizeof(struct analog_pattern));
+	pattern->num_samples = last_end;
+	devc->analog_patterns[PATTERN_ANALOG_RANDOM] = pattern;
+}
+
+SR_PRIV void demo_free_analog_pattern(struct dev_context *devc)
+{
+	g_free(devc->analog_patterns[PATTERN_SQUARE]);
+	g_free(devc->analog_patterns[PATTERN_SINE]);
+	g_free(devc->analog_patterns[PATTERN_TRIANGLE]);
+	g_free(devc->analog_patterns[PATTERN_SAWTOOTH]);
+	g_free(devc->analog_patterns[PATTERN_ANALOG_RANDOM]);
 }
 
 static uint64_t encode_number_to_gray(uint64_t nr)
@@ -408,7 +425,7 @@ static void send_analog_packet(struct analog_gen *ag,
 	ag->packet.meaning->mq = ag->mq;
 	ag->packet.meaning->mqflags = ag->mq_flags;
 
-	/* Set a unit for the given quantity */
+	/* Set a unit for the given quantity. */
 	if (ag->mq == SR_MQ_VOLTAGE)
 		ag->packet.meaning->unit = SR_UNIT_VOLT;
 	else if (ag->mq == SR_MQ_CURRENT)
@@ -482,17 +499,28 @@ static void send_analog_packet(struct analog_gen *ag,
 		ag_pattern_pos = analog_pos % pattern->num_samples;
 		sending_now = MIN(analog_todo, pattern->num_samples - ag_pattern_pos);
 		if (ag->amplitude != DEFAULT_ANALOG_AMPLITUDE ||
-			ag->offset != DEFAULT_ANALOG_OFFSET) {
-
-			/* Amplitude or offset changed, modify each sample */
-			amplitude = ag->amplitude / DEFAULT_ANALOG_AMPLITUDE;
-			offset = ag->offset - DEFAULT_ANALOG_OFFSET;
+			ag->offset != DEFAULT_ANALOG_OFFSET ||
+			ag->pattern == PATTERN_ANALOG_RANDOM) {
+			/*
+			 * Amplitude or offset changed (or we are generating
+			 * random data), modify each sample.
+			 */
+			if (ag->pattern == PATTERN_ANALOG_RANDOM) {
+				amplitude = ag->amplitude / 500.0;
+				offset = ag->offset - DEFAULT_ANALOG_OFFSET - ag->amplitude;
+			} else {
+				amplitude = ag->amplitude / DEFAULT_ANALOG_AMPLITUDE;
+				offset = ag->offset - DEFAULT_ANALOG_OFFSET;
+			}
 			data = ag->packet.data;
 			for (i = 0; i < sending_now; i++) {
-				data[i] = pattern->data[ag_pattern_pos + i] * amplitude + offset;
+				if (ag->pattern == PATTERN_ANALOG_RANDOM)
+					data[i] = (rand() % 1000) * amplitude + offset;
+				else
+					data[i] = pattern->data[ag_pattern_pos + i] * amplitude + offset;
 			}
 		} else {
-			/* Amplitude and offset not changed, use the fast way */
+			/* Amplitude and offset unchanged, use the fast way. */
 			ag->packet.data = pattern->data + ag_pattern_pos;
 		}
 		ag->packet.num_samples = sending_now;
@@ -503,11 +531,19 @@ static void send_analog_packet(struct analog_gen *ag,
 	} else {
 		ag_pattern_pos = analog_pos % pattern->num_samples;
 		to_avg = MIN(analog_todo, pattern->num_samples - ag_pattern_pos);
-		amplitude = ag->amplitude / DEFAULT_ANALOG_AMPLITUDE;
-		offset = ag->offset - DEFAULT_ANALOG_OFFSET;
+		if (ag->pattern == PATTERN_ANALOG_RANDOM) {
+			amplitude = ag->amplitude / 500.0;
+			offset = ag->offset - DEFAULT_ANALOG_OFFSET - ag->amplitude;
+		} else {
+			amplitude = ag->amplitude / DEFAULT_ANALOG_AMPLITUDE;
+			offset = ag->offset - DEFAULT_ANALOG_OFFSET;
+		}
 
 		for (i = 0; i < to_avg; i++) {
-			value = *(pattern->data + ag_pattern_pos + i) * amplitude + offset;
+			if (ag->pattern == PATTERN_ANALOG_RANDOM)
+				value = (rand() % 1000) * amplitude + offset;
+			else
+				value = *(pattern->data + ag_pattern_pos + i) * amplitude + offset;
 			ag->avg_val = (ag->avg_val + value) / 2;
 			ag->num_avgs++;
 			/* Time to send averaged data? */