MeshCore-Solo/examples/companion_radio/ui-lvgl/DiagScreen.h

#pragma once
// Home > Diagnostics -- ui-new's Tools > Diagnostics. Tabs Live / History /
// System / Font / Noise; the rows come from ui-core/Diagnostics.h. Live
// refreshes every second and its header button resets the counters (after a
// confirm). History charts the last 8 hours (ui-core/StatusHistory.h, as on
// e-ink): the battery, the noise floor, the SNR of the last packets, traffic.
//
// Single-TU fragment: included by ui-lvgl/UITask.cpp after DeviceScreen.h.

#ifndef SIM_PLATFORM
extern RADIO_CLASS radio;   // the variant's target.cpp (the noise sweep retunes it)
#endif

namespace diagview {

enum : uint8_t { TAB_LIVE, TAB_HISTORY, TAB_SYSTEM, TAB_FONT, TAB_NOISE, TAB_COUNT };
static uint8_t s_tab = TAB_LIVE;   // kept across visits
static lv_obj_t* s_list = nullptr;
static const int EXTRA = 4;   // GPS, power, last reset, last crash (L2 only)
// A Live row's value labels: `in` / `out` for a packet count ("12/3" from
// ui-core), else `val` alone.
struct LiveVal { lv_obj_t* val; lv_obj_t* in; lv_obj_t* out; };
static LiveVal s_vals[diag::MAX_ROWS + EXTRA];
static int s_rows = 0;

// The history, a sample every 5 minutes from boot (UITask::sampleHistory()).
static PSRAM_BSS uicore::StatusHistory<96, 300000UL> s_hist;
static uint32_t s_hist_shown = 0;   // the history's version the charts show
static lv_obj_t* s_ch_obj[4];       // History's charts and their values now
static lv_obj_t* s_ch_now[4];

static uint32_t totalRecv() {
  uint32_t n = 0;
  for (uint8_t t = 0; t < 16; t++) n += the_mesh.getNumRecvByType(t);
  return n;
}

// One chart's samples as drawn: a copy, so the draw callback needn't know
// which ring (of which size) they came from. What the axis and the pill
// say is set once (setupCharts()).
static PSRAM_BSS chart::Chart s_charts[4];
template <int N>
static void chartOf(int k, const uicore::History<N>& h) {
  chart::Chart& c = s_charts[k];
  c.n = h.n; c.cap = N;
  for (int i = 0; i < h.n; i++) c.v[i] = h.at(i);
}

// A sample's age: the charts sample every 5 minutes, SNR every packet.
static void whenAgo(const chart::Chart& c, int i, char* out, size_t n) {
  chart::ago((uint32_t)(c.n - 1 - i) * (s_hist.INTERVAL_MS / 60000UL), out, n);
}
static void setupCharts() {
  using chart::Chart;
  static const char* const HOURS[5] = { "8 h", "6 h", "4 h", "2 h", "now" };
  for (int k = 0; k < 4; k++) {
    Chart& c = s_charts[k];
    c.where = whenAgo;
    for (int j = 0; j < 5; j++) c.under[j] = HOURS[j];
  }
  Chart& b = s_charts[0];   // mV, in steps of 10 mV and up
  b.min_span = 100; b.unit = 10;
  b.axis = [](int v, int step, char* o, size_t n) {
    if (step % 100 == 0) snprintf(o, n, "%d.%d V", v / 1000, v % 1000 / 100);
    else snprintf(o, n, "%d.%02d", v / 1000, v % 1000 / 10);
  };
  b.value = [](const Chart& c, int i, char* o, size_t n) { snprintf(o, n, "%.2f V", c.v[i] / 1000.0f); };
  Chart& f = s_charts[1];   // dBm
  f.min_span = 6;
  f.axis = [](int v, int, char* o, size_t n) { snprintf(o, n, "%d", v); };
  f.value = [](const Chart& c, int i, char* o, size_t n) { snprintf(o, n, "%d dBm", c.v[i]); };
  Chart& r = s_charts[2];   // dB x4, a sample a packet
  r.min_span = 20; r.unit = 4;
  r.axis = [](int v, int, char* o, size_t n) { snprintf(o, n, "%d", v / 4); };
  r.value = [](const Chart& c, int i, char* o, size_t n) { snprintf(o, n, "%.1f dB", c.v[i] / 4.0f); };
  r.where = [](const Chart& c, int i, char* o, size_t n) {
    const int k = c.n - 1 - i;
    if (!k) snprintf(o, n, "last packet"); else snprintf(o, n, "%d packet%s back", k, k == 1 ? "" : "s");
  };
  static const char* const PKTS[3] = { "32 back", "16", "last" };
  for (int j = 0; j < 5; j++) r.under[j] = j < 3 ? PKTS[j] : nullptr;
  Chart& t = s_charts[3];   // packets per interval
  t.bars = true; t.min_span = 4;
  t.axis = [](int v, int, char* o, size_t n) { snprintf(o, n, "%d", v); };
  t.value = [](const Chart& c, int i, char* o, size_t n) { snprintf(o, n, "%d packet%s", c.v[i], c.v[i] == 1 ? "" : "s"); };
}

// A chart card: the title and the value now over the chart.
static void chartCard(lv_obj_t* parent, int k, const char* title) {
  lv_obj_t* card = infoCard(parent);
  lv_obj_set_style_pad_ver(card, 6, 0);
  lv_obj_set_style_pad_row(card, 4, 0);
  lv_obj_t* r = lv_obj_create(card);
  lv_obj_remove_style_all(r);
  fillWidth(r);
  lv_obj_set_height(r, LV_SIZE_CONTENT);
  lv_obj_align(label(r, title, THEME_FONT_SMALL, theme::TEXT_MUTED), LV_ALIGN_LEFT_MID, 0, 0);
  s_ch_now[k] = label(r, "", THEME_FONT_BODY, theme::TEXT);
  lv_obj_align(s_ch_now[k], LV_ALIGN_RIGHT_MID, 0, 0);
  s_ch_obj[k] = chart::create(card, s_charts[k], 96);
}

static void extraRow(diag::Row* rows, int& n, const char* lbl, const char* fmt, ...) {
  rows[n].label = lbl;
  va_list ap; va_start(ap, fmt);
  vsnprintf(rows[n].value, sizeof(rows[n].value), fmt, ap);
  va_end(ap);
  n++;
}

// ui-core's live rows plus the receiver's state and why the device last
// started -- what to look at when GPS gets no fix or the device restarted.
static int allRows(diag::Row* rows, bool gps_on) {
  int n = diag::liveRows(rows);
#if defined(SEEED_WIO_TRACKER_L2)
  static uint32_t s_chars = 0, s_moved_ms = 0;
  uint32_t c = gps.rxChars();
  if (c != s_chars) { s_chars = c; s_moved_ms = millis(); }
  bool data = c > 0 && millis() - s_moved_ms < 3000;
  if (!gps_on) extraRow(rows, n, "GPS", "off");
  else if (!data) extraRow(rows, n, "GPS", "no data (%lu B)", (unsigned long)c);
  else extraRow(rows, n, "GPS", "%s, %ld sats", gps.isValid() ? "fix" : "no fix", gps.satellitesCount());
  extraRow(rows, n, "Power", "%s", board.isExternalPowered() ? "USB" : "battery");
#else
  (void)gps_on;
#endif
  extraRow(rows, n, "Last start", "%s", lvport::resetReason());
  char crash[32];
  if (lvport::crashSummary(crash, sizeof(crash))) extraRow(rows, n, "Last crash", "%s", crash);
  return n;
}

// ui-core's labels are cut for a 128 px OLED; here each gets a section and a
// full name. Packet rows are "received/sent" pairs, shown in two columns.
enum : uint8_t { SEC_DEVICE, SEC_PACKETS, SEC_RADIO, SEC_MEMORY, SEC_COUNT };
static const char* const SEC_TITLE[SEC_COUNT] = { "DEVICE", "PACKETS", "RADIO", "MEMORY" };
struct Name { const char* core; uint8_t sec; const char* text; bool pair; };
static const Name NAMES[] = {
  { "Uptime", SEC_DEVICE, "Uptime", false },          { "Last start", SEC_DEVICE, "Last start", false },
  { "Last crash", SEC_DEVICE, "Last crash", false },  { "Power", SEC_DEVICE, "Power", false },
  { "GPS", SEC_DEVICE, "GPS", false },
  { "Total rx/tx", SEC_PACKETS, "All", true },         { "Msg", SEC_PACKETS, "Messages", true },
  { "Advert", SEC_PACKETS, "Adverts", true },          { "Ack/Path", SEC_PACKETS, "Acks & paths", true },
  { "Other", SEC_PACKETS, "Other", true },             { "Forwarded", SEC_PACKETS, "Forwarded", false },
  { "Noise floor", SEC_RADIO, "Noise floor", false },  { "RSSI/SNR", SEC_RADIO, "Last packet", false },
  { "Queue", SEC_RADIO, "Send queue", false },         { "Errors", SEC_RADIO, "Errors", false },
  { "RXPS wd s/h", SEC_RADIO, "RX watchdog soft / hard", false },
  { "Heap free", SEC_MEMORY, "Heap free", false },     { "Stack free", SEC_MEMORY, "UI stack free (lowest)", false },
  { "Pool free", SEC_MEMORY, "Packet pool free", false },
};
static const Name* nameOf(const char* core) {
  for (const Name& n : NAMES) if (!strcmp(n.core, core)) return &n;
  return nullptr;
}

// A value as shown: "-60/40.0" -> "-60 dBm, SNR 40.0"; "12/456KB" -> "12 of 456 KB".
static void showValue(const char* core, const char* v, char* out, size_t n) {
  const char* slash = strchr(v, '/');
  if (!strcmp(core, "RSSI/SNR") && slash) snprintf(out, n, "%.*s dBm, SNR %s", (int)(slash - v), v, slash + 1);
  else if (!strcmp(core, "Heap free") && slash) snprintf(out, n, "%.*s of %s", (int)(slash - v), v, slash + 1);
  else snprintf(out, n, "%s", v);
  size_t l = strlen(out);   // "KB" / "B" units get their space
  if (l > 2 && !strcmp(out + l - 2, "KB") && out[l - 3] != ' ') snprintf(out + l - 2, n - (l - 2), " KB");
  else if (l > 1 && out[l - 1] == 'B' && out[l - 2] >= '0' && out[l - 2] <= '9') snprintf(out + l - 1, n - (l - 1), " B");
}

static void setLive(int i, const diag::Row& r) {
  LiveVal& lv = s_vals[i];
  if (!lv.in && !lv.val) return;   // its section isn't built yet (fill)
  if (lv.in) {
    const char* slash = strchr(r.value, '/');
    char a[12];
    snprintf(a, sizeof(a), "%.*s", slash ? (int)(slash - r.value) : (int)strlen(r.value), r.value);
    setText(lv.in, a);
    setText(lv.out, slash ? slash + 1 : "");
    return;
  }
  char v[40];
  showValue(r.label, r.value, v, sizeof(v));
  setText(lv.val, v);
  if (!strcmp(r.label, "Errors")) setTextColor(lv.val, strcmp(r.value, "OK") ? theme::FAIL : theme::OK);
}

// A packets row: the name, then received and sent in fixed columns.
static const int COL_W = 56;
static lv_obj_t* pairLine(lv_obj_t* card, const char* name, lv_obj_t** in, lv_obj_t** out, bool head) {
  lv_obj_t* r = infoLine(card);
  lv_obj_t* k = label(r, name, THEME_FONT_SMALL, theme::TEXT_MUTED);
  lv_obj_align(k, LV_ALIGN_LEFT_MID, 0, 0);
  const lv_font_t* f = head ? THEME_FONT_SMALL : THEME_FONT_BODY;
  uint32_t col = head ? theme::TEXT_MUTED : theme::TEXT;
  *out = label(r, head ? "Sent" : "", f, col);
  lv_obj_set_width(*out, COL_W);
  lv_obj_set_style_text_align(*out, LV_TEXT_ALIGN_RIGHT, 0);
  lv_obj_align(*out, LV_ALIGN_RIGHT_MID, 0, 0);
  *in = label(r, head ? "Received" : "", f, col);
  lv_obj_set_width(*in, COL_W + 16);
  lv_obj_set_style_text_align(*in, LV_TEXT_ALIGN_RIGHT, 0);
  lv_obj_align(*in, LV_ALIGN_RIGHT_MID, -COL_W, 0);
  return r;
}

// Noise tab: how much the radio hears with nothing on air, on any board --
// the floor on the mesh's frequency now (the median of 5 s of readings, and
// the 10th percentile, which a packet can't lift), then a sweep of +-1.1 MHz
// round it. A floor well above ~-115 dBm, flat across the sweep, is broadband
// noise (a power supply, a charger); a spike is some clock's harmonic landing
// there. Blocking, ~12 s. (The L2's noise was found this way: its I2S clock,
// now stopped between sounds.)
struct Sweep { float f0, step; int n; int16_t v[96]; };
static Sweep s_near = { 0, 0.025f, 91, {} };
static int16_t s_floor_med = 0, s_floor_lo = 0;
static bool s_noise_have = false;
static bool s_noise_usb = false;
static lv_obj_t* s_noise_status = nullptr;

static void onNoiseRun(lv_event_t* e) { (void)e; s_ui->diagNoiseRun(); }

// A sweep as bars (Chart.h), the step nearest the mesh's frequency in the
// accent, then its quietest / loudest values.
static PSRAM_BSS chart::Chart s_sweep_chart;
static char s_sweep_under[3][12];
static void plotSweep(lv_obj_t* list, const char* title, const Sweep& sw, float mesh_f) {
  sectionTitle(list, title);
  int lo = 0, hi = 0;
  for (int i = 1; i < sw.n; i++) {
    if (sw.v[i] < sw.v[lo]) lo = i;
    if (sw.v[i] > sw.v[hi]) hi = i;
  }
  chart::Chart& c = s_sweep_chart;
  c = chart::Chart();
  c.n = c.cap = sw.n;
  for (int i = 0; i < sw.n; i++) c.v[i] = sw.v[i];
  c.bars = true;
  c.bar = theme::TEXT_MUTED;
  c.mark = (int16_t)lroundf((mesh_f - sw.f0) / sw.step);
  c.min_span = 10;
  c.axis = [](int v, int, char* o, size_t n) { snprintf(o, n, "%d", v); };
  c.value = [](const chart::Chart& c, int i, char* o, size_t n) { snprintf(o, n, "%d dBm", c.v[i]); };
  c.where = [](const chart::Chart&, int i, char* o, size_t n) { snprintf(o, n, "%.3f MHz", s_near.f0 + s_near.step * i); };
  snprintf(s_sweep_under[0], sizeof(s_sweep_under[0]), "%.2f", sw.f0);
  snprintf(s_sweep_under[1], sizeof(s_sweep_under[1]), "%.3f", mesh_f);
  snprintf(s_sweep_under[2], sizeof(s_sweep_under[2]), "%.2f MHz", sw.f0 + sw.step * (sw.n - 1));
  for (int j = 0; j < 3; j++) c.under[j] = s_sweep_under[j];
  lv_obj_t* box = infoCard(list);
  lv_obj_set_style_pad_ver(box, 6, 0);
  chart::create(box, c, 120);
  lv_obj_t* card = infoCard(list);
  char v[40];
  snprintf(v, sizeof(v), "%.3f MHz: %d dBm", sw.f0 + sw.step * lo, sw.v[lo]);
  infoRow(card, "Quietest", v);
  snprintf(v, sizeof(v), "%.3f MHz: %d dBm", sw.f0 + sw.step * hi, sw.v[hi]);
  infoRow(card, "Loudest", v);
}

#ifndef SIM_PLATFORM
// 250 instantaneous RSSI readings over 5 s: the median, and the 10th
// percentile (a packet on air only lifts the top).
static void noiseSample(int16_t& med, int16_t& lo) {
  static const int N = 250;
  float v[N];
  for (int i = 0; i < N; i++) { v[i] = radio_driver.getCurrentRSSI(); delay(20); }
  std::sort(v, v + N);
  med = (int16_t)lroundf(v[N / 2]);
  lo = (int16_t)lroundf(v[N / 10]);
}

// The radio retuned step by step (the median of 20 readings each), then put
// back on the mesh's settings and receiving again.
static void noiseSweep(Sweep& sw, const NodePrefs* p) {
  static const int K = 20;
  float v[K];
  for (int i = 0; i < sw.n; i++) {
    radio.standby();
    radio.setFrequency(sw.f0 + sw.step * i);
    radio.startReceive();
    delay(10);
    for (int k = 0; k < K; k++) { v[k] = radio.getRSSI(false); delay(3); }
    std::sort(v, v + K);
    sw.v[i] = (int16_t)lroundf(v[K / 2]);
  }
  radio.standby();
  // Back to what the mesh uses: the repeater's own profile while relaying on
  // one, not always the chat settings.
  if (p) the_mesh.applyRepeaterRadio();
  radio.startReceive();
}
#endif

}  // namespace diagview

void UITask::diagNoiseRun() {
  using namespace diagview;
#ifndef SIM_PLATFORM
  if (!_prefs) return;
  auto status = [&](const char* t) {
    if (!s_noise_status) return;
    lv_label_set_text(s_noise_status, t);
    lv_refr_now(NULL);
  };
  s_noise_usb = board.isExternalPowered();
  status("Listening on the mesh frequency...");
  noiseSample(s_floor_med, s_floor_lo);
  status("Sweeping round it...");
  s_near.f0 = _prefs->freq - s_near.step * (s_near.n / 2);
  noiseSweep(s_near, _prefs);
  s_noise_have = true;
  buildDiag();
#else
  showToast("Only on the device");
#endif
}

static void onOpenDiag(lv_event_t* e) { (void)e; s_ui->showDiag(); }
static void onDiagTab(lv_event_t* e) {
  s_ui->diagTab((int)lv_buttonmatrix_get_selected_button((lv_obj_t*)lv_event_get_target(e)));
}
static void onDiagReset(lv_event_t* e)   { (void)e; s_ui->diagResetPopup(); }
static void onDiagResetGo(lv_event_t* e) { (void)e; s_ui->diagReset(); }

void UITask::showDiag() {
  _screen = SCR_DIAG;
  buildDiag();
}

void UITask::diagTab(int tab) {
  if (tab < 0 || tab >= diagview::TAB_COUNT) return;
  diagview::s_tab = (uint8_t)tab;
  buildDiag();
}

void UITask::buildDiag() {
  using namespace diagview;
  lv_obj_t* body = newScreen("Diagnostics", true);
  lv_obj_set_style_pad_row(body, 4, 0);
  if (s_tab == TAB_LIVE && _header) headerButton(_header, LV_SYMBOL_REFRESH " Reset", onDiagReset, 4, NULL);

  static const char* TABS[] = { "Live", "History", "System", "Font", "Noise", "" };
  lv_obj_t* tabs = segmented(body, TABS, s_tab, lv_pct(100), theme::TAB_H);
  lv_obj_set_style_bg_color(tabs, lv_color_hex(theme::SURFACE), LV_PART_ITEMS);
  lv_obj_add_event_cb(tabs, onDiagTab, LV_EVENT_VALUE_CHANGED, NULL);

  s_list = scrollList(body);
  lv_obj_set_style_pad_row(s_list, 4, 0);
  s_rows = 0;

  if (s_tab == TAB_LIVE) {
    // Section by section, the first at once, the others as the loop goes (fill).
    diag::Row rows[diag::MAX_ROWS + EXTRA];
    s_rows = allRows(rows, _core->gpsEnabled());
    for (int i = 0; i < s_rows; i++) s_vals[i] = { nullptr, nullptr, nullptr };
    fillStart(SEC_COUNT, 1, &UITask::diagSection);
    return;
  }

  s_noise_status = nullptr;
  if (s_tab == TAB_HISTORY) {
    setupCharts();
    chartCard(s_list, 0, "Battery");
    chartCard(s_list, 1, "Noise floor (dBm)");
    chartCard(s_list, 2, "SNR of the last packets (dB)");
    chartCard(s_list, 3, "Packets heard, per 5 min");
    fillHistory();
    return;
  }
  if (s_tab == TAB_NOISE) {
    noteLabel(s_list, "What the radio hears with nothing on air, on the mesh frequency and 1.1 MHz "
                      "either side. Takes about 12 seconds.");
    lv_obj_t* b = lv_button_create(s_list);
    lv_obj_set_size(b, LV_PCT(100), 40);
    lv_obj_set_style_shadow_width(b, 0, 0);
    lv_obj_set_style_radius(b, theme::RADIUS, 0);
    lv_obj_add_event_cb(b, onNoiseRun, LV_EVENT_CLICKED, NULL);
    s_noise_status = label(b, s_noise_have ? LV_SYMBOL_REFRESH "  Measure again" : LV_SYMBOL_PLAY "  Measure", THEME_FONT_BODY, theme::TEXT);
    lv_obj_center(s_noise_status);
    stylePrimary(b);
    if (s_noise_have) {
      float mesh_f = _prefs ? _prefs->freq : 0;
      lv_obj_t* card = infoCard(s_list);
      char v[40];
      snprintf(v, sizeof(v), "%d dBm (low %d)", s_floor_med, s_floor_lo);
      infoRow(card, "Noise floor", v, s_floor_med <= -110 ? theme::OK : theme::TEXT);
      snprintf(v, sizeof(v), "%.3f MHz", mesh_f);
      infoRow(card, "Mesh frequency", v);
      infoRow(card, "Powered from", s_noise_usb ? "USB (a charger can add noise)" : "battery");
      plotSweep(s_list, "+- 1.1 MHz", s_near, mesh_f);
    }
    sectionTitle(s_list, "READING IT");   // lower is better
    lv_obj_t* key = infoCard(s_list);
    infoRow(key, "About -115 dBm", "quiet receiver");
    infoRow(key, "Raised, flat", "charger / power supply");
    infoRow(key, "One spike", "a clock nearby");
    return;
  }
  lv_obj_t* card = infoCard(s_list);
  if (s_tab == TAB_FONT) {   // "Latin ABCabc": the script, then its sample
    diag::Line lines[diag::MAX_LINES];
    int n = diag::fontLines(lines);
    for (int i = 0; i < n; i++) {
      char* sp = strchr(lines[i], ' ');
      if (sp) *sp = '\0';
      infoRow(card, lines[i], sp ? sp + 1 : "", theme::TEXT, THEME_FONT_TITLE);
    }
    // Colour emoji (Twemoji images the text fonts fall back to) and a flag,
    // two regional indicator letters swapped for one glyph. L2 only: the L1
    // font has none, so this isn't in the shared list.
    infoRow(card, "Emoji", "\xF0\x9F\x98\x80 \xF0\x9F\x91\x8D \xE2\x9D\xA4 \xF0\x9F\x94\xA5 "
                           "\xF0\x9F\x93\xA1 \xE2\x9B\xB0 \xF0\x9F\x87\xB5\xF0\x9F\x87\xB1",
            theme::TEXT, THEME_FONT_TITLE);   // grin, thumbs up, heart, fire, antenna, mountain, PL
    return;
  }
  // System: this build and the radio settings.
  char v[48];
  diag::shortVersion(v, sizeof(v));
  infoRow(card, "Firmware", v);
  infoRow(card, "Built", FIRMWARE_BUILD_DATE);
#ifdef MESHCORE_VERSION
  infoRow(card, "MeshCore", MESHCORE_VERSION);
#endif
  infoRow(card, "Device", board.getManufacturerName());
  infoRow(card, "Node name", the_mesh.getNodeName());
  if (NodePrefs* p = the_mesh.getNodePrefs()) {
    sectionTitle(s_list, "RADIO");
    card = infoCard(s_list);
    snprintf(v, sizeof(v), "%.3f MHz", p->freq);
    infoRow(card, "Frequency", v);
    snprintf(v, sizeof(v), "%.1f kHz", p->bw);
    if (strstr(v, ".0 ")) snprintf(v, sizeof(v), "%.0f kHz", p->bw);
    infoRow(card, "Bandwidth", v);
    snprintf(v, sizeof(v), "%u", (unsigned)p->sf);
    infoRow(card, "Spreading factor", v);
    snprintf(v, sizeof(v), "4/%u", (unsigned)p->cr);
    infoRow(card, "Coding rate", v);
    snprintf(v, sizeof(v), "%d dBm", (int)p->tx_power_dbm);
    infoRow(card, "TX power", v);
  }
}

// From loop(), once a second: the Live values in place.
// One Live section, in ui-core's order within it.
void UITask::diagSection(int sec) {
  using namespace diagview;
  diag::Row rows[diag::MAX_ROWS + EXTRA];
  int n = allRows(rows, _core->gpsEnabled());
  if (n != s_rows) return;   // changed meanwhile: refreshDiag() builds it again
  lv_obj_t* card = nullptr;
  for (int i = 0; i < n; i++) {
    const Name* nm = nameOf(rows[i].label);
    if ((nm ? nm->sec : SEC_DEVICE) != sec) continue;
    if (!card) {
      sectionTitle(s_list, SEC_TITLE[sec]);
      card = infoCard(s_list);
      if (sec == SEC_PACKETS) { lv_obj_t *a, *b; pairLine(card, "", &a, &b, true); }
    }
    if (nm && nm->pair) pairLine(card, nm->text, &s_vals[i].in, &s_vals[i].out, false);
    else s_vals[i].val = infoRow(card, nm ? nm->text : rows[i].label, "");
    setLive(i, rows[i]);
  }
}

// History's charts and values from the history as it is now.
void UITask::fillHistory() {
  using namespace diagview;
  s_hist_shown = s_hist.version;
  chartOf(0, s_hist.batt);
  chartOf(1, s_hist.noise);
  chartOf(2, s_hist.snr);
  chartOf(3, s_hist.traffic);
  for (int k = 0; k < 4; k++) lv_obj_invalidate(s_ch_obj[k]);
  setTextFmt(s_ch_now[0], "%.2f V", (_batt_mv ? _batt_mv : getBattMilliVolts()) / 1000.0f);
  const int nf = (int)radio_driver.getNoiseFloor();
  if (nf) setTextFmt(s_ch_now[1], "%d dBm", nf); else setText(s_ch_now[1], "-");
  if (s_hist.snr.n) setTextFmt(s_ch_now[2], "%.1f dB", s_hist.snr.at(s_hist.snr.n - 1) / 4.0f); else setText(s_ch_now[2], "-");
  setTextFmt(s_ch_now[3], "%d", s_hist.traffic.n ? s_hist.traffic.at(s_hist.traffic.n - 1) : 0);
}

// From loop(): the history's readings (it keeps its own pace).
void UITask::sampleHistory() {
  using namespace diagview;
  s_hist.tick(millis(), (int)radio_driver.getNoiseFloor(), _batt_mv ? _batt_mv : getBattMilliVolts(),
              totalRecv(), radio_driver.getLastSNR());
}

void UITask::refreshDiag() {
  using namespace diagview;
  if (_screen == SCR_DIAG && s_tab == TAB_HISTORY && !_nav_overlay && s_hist.version != s_hist_shown) {
    fillHistory();   // a new sample: the charts in place, the list stays where it was scrolled
    return;
  }
  if (_screen != SCR_DIAG || s_tab != TAB_LIVE || _nav_overlay) return;
  diag::Row rows[diag::MAX_ROWS + EXTRA];
  int n = allRows(rows, _core->gpsEnabled());
  if (n != s_rows) { buildDiag(); return; }
  for (int i = 0; i < n; i++) setLive(i, rows[i]);   // unchanged text isn't redrawn (UITask.cpp)
}

void UITask::diagResetPopup() {
  confirmBody(navPopupPanel("Reset counters?", false), "Zeroes packet and error counts.", LV_SYMBOL_REFRESH "  Reset",
              onDiagResetGo, 0);
}

void UITask::diagReset() {
  diag::resetCounters();
  diagview::s_hist.countersReset();
  navClosePopup();
  refreshDiag();
}