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perf(l2): map tiles decode on the other core

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- TileCache: request() hands z/x/y to a task on core 0, which renders into
  a spare buffer; poll() swaps it into the LRU slot (stale results dropped
  after drop()/invalidate()); the sim runs the job at once
- MapScreen / Home map place finished tiles as they arrive; the longest
  UI stall with the map opening goes from ~340 to ~170 ms
- LVGL allocates from the PSRAM heap (lv_mem_psram.h), safe from both
  tasks; LVGL's own pool is gone
- lv_conf: notes why LV_OS_FREERTOS with two draw units stays off
  (measured slower: drawing is bound by PSRAM bandwidth)
- UI_PERF_TEST: the map (tile read/decode, pan, redraw), build time and
  the longest loop pass per screen

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Jakub
2026-09-30 00:24:57 +02:00
co-authored by Claude Opus 5.5
parent b3b77a1f6d
commit 247fab08d0
9 changed files with 230 additions and 60 deletions
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examples/companion_radio/ui-lvgl/HomeScreen.h
+6 -6
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@@ -765,8 +765,8 @@ void UITask::homeMapLayout() {
else lv_obj_add_flag(s_hint, LV_OBJ_FLAG_HIDDEN);
}
// From loop() while the map page is up: one tile decode per pass, a re-frame
// every few seconds.
// From loop() while the map page is up: tiles one at a time (decoded on the
// other core, placed here), a re-frame every few seconds.
void UITask::homeMapLoop() {
using namespace home::mini;
if (!s_area || home::s_touching) return;
@@ -774,7 +774,8 @@ void UITask::homeMapLoop() {
s_next_fit_ms = millis() + 5000;
if (homeMapFit()) homeMapLayout();
}
if (!s_pending) return;
if (mapview::pollTiles()) homeMapLayout();
if (!s_pending || mapview::s_cache.busy()) return;
int w = lv_obj_get_width(s_area), h = lv_obj_get_height(s_area);
double left = s_cx * mapview::TILE_PX - w / 2.0, top = s_cy * mapview::TILE_PX - h / 2.0;
int tx0 = (int)floor(left / mapview::TILE_PX), ty0 = (int)floor(top / mapview::TILE_PX);
@@ -785,12 +786,11 @@ void UITask::homeMapLoop() {
int px = (int)lround(tx * (double)mapview::TILE_PX - left), py = (int)lround(ty * (double)mapview::TILE_PX - top);
if (ty < 0 || ty >= n || px >= w || py >= h) continue;
mapview::TileCache::Slot* s = mapview::s_cache.find(s_z, wx, ty);
if (!s) { mapview::s_cache.load(*mapview::s_provider, s_z, wx, ty); homeMapLayout(); return; }
if (!s) { mapview::loadTile(s_z, wx, ty); return; }
if (s->present) continue;
int k, wz, ax, ay;
if (!mapview::ancestorFor(s_z, wx, ty, k, wz, ax, ay) && wz >= 0) {
mapview::s_cache.load(*mapview::s_provider, wz, ax, ay);
homeMapLayout();
mapview::loadTile(wz, ax, ay);
return;
}
}