X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=output%2Fgnuplot.c;h=cadd4fa3b8c2f4f46fdc742674e348561d975efa;hb=0bc3ab92e66ee08486e25a9a95b1300e2654fd28;hp=29508cefdc62ae20c59e25217ccb2be33570d190;hpb=3544f848e0d7f67af8e11ce7ec344b34cd797df3;p=libsigrok.git

diff --git a/output/gnuplot.c b/output/gnuplot.c
index 29508cef..cadd4fa3 100644
--- a/output/gnuplot.c
+++ b/output/gnuplot.c
@@ -80,9 +80,17 @@ static int init(struct sr_output *o)
 	ctx->num_enabled_probes = 0;
 	for (l = o->sdi->probes; l; l = l->next) {
 		probe = l->data;
-		if (probe->enabled)
-			ctx->num_enabled_probes++;
+		if (probe->type != SR_PROBE_LOGIC)
+			continue;
+		if (!probe->enabled)
+			continue;
+		ctx->num_enabled_probes++;
 	}
+	if (ctx->num_enabled_probes <= 0) {
+		sr_err("%s: no logic probe enabled", __func__);
+		return SR_ERR;
+	}
+
 	ctx->unitsize = (ctx->num_enabled_probes + 7) / 8;
 
 	num_probes = g_slist_length(o->sdi->probes);
@@ -106,6 +114,8 @@ static int init(struct sr_output *o)
 	wbuf[0] = '\0';
 	for (i = 0, l = o->sdi->probes; l; l = l->next, i++) {
 		probe = l->data;
+		if (probe->type != SR_PROBE_LOGIC)
+			continue;
 		if (!probe->enabled)
 			continue;
 		c = (char *)&wbuf + strlen((const char *)&wbuf);