demo: Skip generating data when all channels in a group are disabled

[libsigrok.git] / src / hardware / demo / api.c

diff --git a/src/hardware/demo/api.c b/src/hardware/demo/api.c
index 645ef5f2317744a3f019cb033528c5a9306266fe..92b59fe3a32f07751111e5135b82c408c3fc3c3d 100644 (file)
--- a/src/hardware/demo/api.c
+++ b/src/hardware/demo/api.c
@@ -457,6 +457,8 @@ static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *
 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 {
        struct dev_context *devc;
+       GSList *l;
+       struct sr_channel *ch;
        GHashTableIter iter;
        void *value;
 
@@ -466,6 +468,22 @@ static int dev_acquisition_start(const struct sr_dev_inst *sdi)
        devc = sdi->priv;
        devc->sent_samples = 0;
 
+       devc->enabled_logic_channels = 0;
+       devc->enabled_analog_channels = 0;
+       for (l = sdi->channels; l; l = l->next) {
+               ch = l->data;
+               if (!ch->enabled)
+                       continue;
+               if (ch->type == SR_CHANNEL_ANALOG) {
+                       devc->enabled_analog_channels++;
+                       continue;
+               }
+               if (ch->type == SR_CHANNEL_LOGIC) {
+                       devc->enabled_logic_channels++;
+                       continue;
+               }
+       }
+
        g_hash_table_iter_init(&iter, devc->ch_ag);
        while (g_hash_table_iter_next(&iter, NULL, &value))
                demo_generate_analog_pattern(value, devc->cur_samplerate);