From: poljar (Damir Jelić) <redacted>
Date: Tue, 14 Jan 2014 22:03:09 +0000 (+0100)
Subject: demo: Add triangle pattern.
X-Git-Tag: libsigrok-0.3.0~249
X-Git-Url: https://sigrok.org/gitaction?a=commitdiff_plain;h=091c9621275fed7b0a418b644de46efec709d47b;p=libsigrok.git

demo: Add triangle pattern.
---

diff --git a/hardware/demo/demo.c b/hardware/demo/demo.c
index 50bd50c8..0fc5011d 100644
--- a/hardware/demo/demo.c
+++ b/hardware/demo/demo.c
@@ -78,6 +78,7 @@ enum {
 	 */
 	PATTERN_SQUARE,
 	PATTERN_SINE,
+	PATTERN_TRIANGLE,
 };
 
 static const char *logic_pattern_str[] = {
@@ -91,6 +92,7 @@ static const char *logic_pattern_str[] = {
 static const char *analog_pattern_str[] = {
 	"square",
 	"sine",
+	"triangle",
 };
 
 struct analog_gen {
@@ -216,6 +218,21 @@ static void generate_analog_pattern(const struct sr_probe_group *probe_group, ui
 						sin(2 * M_PI * frequency * t);
 		}
 
+		ag->num_samples = num_samples;
+		break;
+
+	case PATTERN_TRIANGLE:
+		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 / M_PI) *
+						asin(sin(2 * M_PI * frequency * t));
+		}
+
 		ag->num_samples = num_samples;
 		break;
 	}