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perf(l2): screen sent by DMA while the next part is drawn

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The panel takes each 24-line band by DMA while LVGL draws the next one
into the other buffer (two 15 KB buffers in internal RAM; LovyanGFX's
4092-byte DMA descriptors leave PSRAM unaligned for the S3's DMA, which
showed as shifted and smeared bands). LVGL draws in the panel's byte
order, and so do map tiles and the frozen screen under a popup, so
nothing is swapped on the way out. Full frames ~10-25% faster (page1
19.9 -> 14.7 ms, Home 21.4 -> 18.2 ms). Without the internal RAM the
screen is sent as before. The arduino2 env keeps the old way.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Jakub
2026-10-01 20:56:13 +02:00
co-authored by Claude Opus 5.5
parent ca5e66a4a1
commit 0a07dc3deb
5 changed files with 123 additions and 15 deletions
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variants/wio-tracker-l2/WioTrackerL2Display.h
+19 -1
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@@ -88,13 +88,30 @@ public:
virtual ~WioTrackerL2Backlight() = default;
};
// The panel, plus a write that doesn't wait: an area's pixels (already in the
// panel's byte order, at most 32 KB -- one SPI transaction) go out by DMA
// while the CPU draws the next one; flushWait() ends it. The library's own
// writes wait for the wire every time (the ui-lvgl frame's ~8 ms).
struct Panel_WioTrackerL2 : public lgfx::Panel_NV3031B {
void flushStart(int x, int y, int w, int h, const uint8_t* data, uint32_t len) {
setWindow(x, y, x + w - 1, y + h - 1);
start_qspi();
_bus->writeBytes(data, len, true, true);
}
void flushWait() {
_bus->wait();
end_qspi();
}
};
class LGFX_WioTrackerL2 : public lgfx::LGFX_Device {
lgfx::Panel_NV3031B _panel_instance;
Panel_WioTrackerL2 _panel_instance;
lgfx::Bus_SPI _bus_instance;
lgfx::Touch_GT911 _touch_instance;
WioTrackerL2Backlight _light_instance;
public:
Panel_WioTrackerL2& panelL2() { return _panel_instance; }
bool init_impl(bool use_reset, bool use_clear) override {
// bring up backlight controller while the I2C bus is still clean
_light_instance.init(_light_instance.getBrightness());
@@ -182,6 +199,7 @@ public:
// direct access to the LGFX device (LVGL flush/touch glue)
lgfx::LGFX_Device* lgfxDevice() { return &disp; }
Panel_WioTrackerL2& panel() { return disp.panelL2(); }
// LVGL draws straight to the panel: the frame sprite (76 KB of PSRAM) only
// carried the boot "Loading..." -- given back once LVGL takes over.
void releaseFrameBuffer() { buffer.deleteSprite(); }