X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=hardware%2Fdemo%2Fdemo.c;h=b5b0d786c064b9081089528d139ea0cbe7abfd16;hb=2cfd16a31672be2ef8227dcda407e8cc5a24607f;hp=0fc5011da0ec256194dc942a79f7576aade57b26;hpb=091c9621275fed7b0a418b644de46efec709d47b;p=libsigrok.git

diff --git a/hardware/demo/demo.c b/hardware/demo/demo.c
index 0fc5011d..b5b0d786 100644
--- a/hardware/demo/demo.c
+++ b/hardware/demo/demo.c
@@ -79,6 +79,7 @@ enum {
 	PATTERN_SQUARE,
 	PATTERN_SINE,
 	PATTERN_TRIANGLE,
+	PATTERN_SAWTOOTH,
 };
 
 static const char *logic_pattern_str[] = {
@@ -93,6 +94,7 @@ static const char *analog_pattern_str[] = {
 	"square",
 	"sine",
 	"triangle",
+	"sawtooth",
 };
 
 struct analog_gen {
@@ -190,7 +192,7 @@ static void generate_analog_pattern(const struct sr_probe_group *probe_group, ui
 
 	switch (ag->pattern) {
 	case PATTERN_SQUARE:
-		value = 5.0;
+		value = ANALOG_AMPLITUDE;
 		last_end = 0;
 		for (i = 0; i < num_samples; i++) {
 			if (i % 5 == 0)
@@ -233,6 +235,21 @@ static void generate_analog_pattern(const struct sr_probe_group *probe_group, ui
 						asin(sin(2 * M_PI * frequency * t));
 		}
 
+		ag->num_samples = num_samples;
+		break;
+
+	case PATTERN_SAWTOOTH:
+		frequency = sample_rate / ANALOG_SAMPLES_PER_PERIOD;
+
+		while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
+			num_samples--;
+
+		for (i = 0; i < num_samples; i++) {
+			t = (double) i / (double) sample_rate;
+			ag->pattern_data[i] = 2 * ANALOG_AMPLITUDE *
+						((t * frequency) - floor(0.5f + t * frequency));
+		}
+
 		ag->num_samples = num_samples;
 		break;
 	}