e1608: a configurable generator update rate, and the achieved rate in the Analog out panel

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/ui_probe.cpp

@@ -1923,6 +1923,7 @@ gboolean source_kinds_probe(gpointer user) {
       c.set("trigger", "rising");
       c.set("dir1", "o");
       c.set("plot0", "1");
+      c.set("gen_rate", "120");
     } else if (id == "flatudp") {
       c.set("port", "44600");
       c.set("bind", "10.0.0.8");
@@ -2428,6 +2429,76 @@ gboolean e1608_probe(gpointer user) {
   return G_SOURCE_REMOVE;
 }
 
+/// Phase 3 of the generator probe: the generator switched off 400 ms ago; the achieved rate and the
+/// panel must both have gone back to "off".
+gboolean e1608_gen_probe_stopped(gpointer user) {
+  App* a = static_cast<App*>(user);
+  if (a->window == nullptr) return G_SOURCE_REMOVE;
+  e1608::E1608Source* src = e1608_source(a);
+  if (src == nullptr) return G_SOURCE_REMOVE;
+  GtkWidget* row = find_named(source_panel_content(a, "source-ao"), "e1608-gen-rate");
+  const char* sub = row != nullptr ? adw_action_row_get_subtitle(ADW_ACTION_ROW(row)) : nullptr;
+  const double hz = src->readouts()->gen_hz.load();
+  const bool off = sub != nullptr && std::strncmp(sub, "off", 3) == 0;
+  std::fprintf(stderr, "[e1608] generator stopped: achieved=%.1f panel='%s' ok=%d\n", hz,
+               sub != nullptr ? sub : "", hz == 0.0 && off ? 1 : 0);
+  std::fflush(stderr);
+  return G_SOURCE_REMOVE;
+}
+
+/// Phase 2 of the generator probe, 2.5 s after a Sine generator was started on DAC 0: the achieved
+/// update rate the source measured, and the text the Analog out panel shows for it.
+gboolean e1608_gen_probe_report(gpointer user) {
+  App* a = static_cast<App*>(user);
+  if (a->window == nullptr) return G_SOURCE_REMOVE;
+  e1608::E1608Source* src = e1608_source(a);
+  if (src == nullptr) return G_SOURCE_REMOVE;
+  GtkWidget* ao = source_panel_content(a, "source-ao");
+  GtkWidget* row = find_named(ao, "e1608-gen-rate");
+  const char* sub = row != nullptr ? adw_action_row_get_subtitle(ADW_ACTION_ROW(row)) : nullptr;
+  const double req = src->settings().gen_rate;
+  const double hz = src->readouts()->gen_hz.load();
+  // The mock answers at once, so the achieved rate sits at the requested one; the band is loose.
+  const bool in_range = hz >= 0.7 * req && hz <= 1.1 * req;
+  char want[32];
+  std::snprintf(want, sizeof want, "(requested %.0f Hz)", req);
+  const bool shown = sub != nullptr && std::strstr(sub, want) != nullptr && std::strstr(sub, "Hz") != nullptr;
+  std::fprintf(stderr, "[e1608] generator: requested=%.1f achieved=%.1f panel='%s' ok=%d\n", req, hz,
+               sub != nullptr ? sub : "", in_range && shown ? 1 : 0);
+  std::fflush(stderr);
+  GtkWidget* run = find_named(ao, "e1608-ao0-run");
+  if (run != nullptr) adw_switch_row_set_active(ADW_SWITCH_ROW(run), FALSE);
+  g_timeout_add(400, e1608_gen_probe_stopped, a);
+  return G_SOURCE_REMOVE;
+}
+
+/// Starts a Sine generator on DAC 0 through the panel's own controls, then reads it 2.5 s later.
+gboolean e1608_gen_probe(gpointer user) {
+  App* a = static_cast<App*>(user);
+  if (a->window == nullptr) return G_SOURCE_REMOVE;
+  e1608::E1608Source* src = e1608_source(a);
+  if (src == nullptr) {
+    std::fprintf(stderr, "[e1608] generator: no e1608 source (run with --source e1608)\n");
+    std::fflush(stderr);
+    return G_SOURCE_REMOVE;
+  }
+  GtkWidget* ao = source_panel_content(a, "source-ao");
+  GtkWidget* mode = find_named(ao, "e1608-ao0-mode");
+  GtkWidget* run = find_named(ao, "e1608-ao0-run");
+  if (mode == nullptr || run == nullptr) {
+    std::fprintf(stderr, "[e1608] generator: controls missing (mode=%d run=%d)\n", mode != nullptr ? 1 : 0,
+                 run != nullptr ? 1 : 0);
+    std::fflush(stderr);
+    return G_SOURCE_REMOVE;
+  }
+  // The panel refreshes on its frame clock, which only ticks while the page is on screen.
+  if (a->side_stack != nullptr) adw_view_stack_set_visible_child_name(ADW_VIEW_STACK(a->side_stack), "source-ao");
+  adw_combo_row_set_selected(ADW_COMBO_ROW(mode), 1);  // Sine
+  adw_switch_row_set_active(ADW_SWITCH_ROW(run), TRUE);
+  g_timeout_add(2500, e1608_gen_probe_report, a);
+  return G_SOURCE_REMOVE;
+}
+
 /// After the mock dropped the link: has the source reconnected, and does the stream move again?
 gboolean e1608_probe_resumed(gpointer user) {
   App* a = static_cast<App*>(user);