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feat(l2): screenshots over USB (RGB565); USB tools moved to the Solo site

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- CMD_GET_SCREENSHOT on colour screens: display type 2 (RGB565 LE),
  32-bit payload size; ui-lvgl captureFrame() shared with the SD BMP
- ENABLE_SCREENSHOT in the L2 build; tools/screenshot.py decodes type 2
- docs and READMEs point to solo.marekzegarek.com/#pc-tools
- USB popup: "Keep card" instead of "Charge only" (only the card is lent;
  charging and USB serial work either way)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Jakub
2026-09-29 12:27:59 +02:00
co-authored by Claude Opus 5.5
parent 4ab9d949ec
commit e4d24650c5
11 changed files with 83 additions and 40 deletions
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examples/companion_radio/ui-lvgl/UITask.cpp
+21 -14
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@@ -1558,11 +1558,26 @@ static void restartScreen(const char* why) {
}
// The screen as it is, toasts and popups included, re-rendered once into a
// buffer the flush callback fills (lvport::shotCopy) and written to the card
// as a 24-bit BMP: /sdcard/screenshots/scr_NNNN.bmp.
void UITask::takeScreenshot() {
// buffer the flush callback fills (lvport::shotCopy).
uint16_t* UITask::captureFrame(int& w, int& h) {
lv_display_t* d = lv_display_get_default();
const int32_t W = lv_display_get_horizontal_resolution(d), H = lv_display_get_vertical_resolution(d);
w = lv_display_get_horizontal_resolution(d);
h = lv_display_get_vertical_resolution(d);
#ifdef ESP32
uint16_t* px = (uint16_t*)heap_caps_malloc(w * h * 2, MALLOC_CAP_SPIRAM);
#else
uint16_t* px = (uint16_t*)malloc(w * h * 2);
#endif
if (!px) return nullptr;
lvport::s_shot = px;
lv_obj_invalidate(lv_screen_active()); // the whole display, every layer
lv_refr_now(d);
lvport::s_shot = nullptr;
return px;
}
// The screen, written to the card as a 24-bit BMP: /sdcard/screenshots/scr_NNNN.bmp.
void UITask::takeScreenshot() {
if (!lvport::mountStorage()) { showToast("No SD card"); return; }
mkdir("/sdcard", 0777); // the sim's MEMFS may not have it yet (the card: fails, harmless)
mkdir("/sdcard/screenshots", 0777);
@@ -1574,18 +1589,10 @@ void UITask::takeScreenshot() {
if (stat(path, &st) != 0) break;
}
if (n > 9999) { showToast("Screenshots folder full"); return; }
#ifdef ESP32
uint16_t* px = (uint16_t*)heap_caps_malloc(W * H * 2, MALLOC_CAP_SPIRAM);
#else
uint16_t* px = (uint16_t*)malloc(W * H * 2);
#endif
int W, H;
uint16_t* px = captureFrame(W, H);
if (!px) { showToast("Out of memory"); return; }
lvport::s_shot = px;
lv_obj_invalidate(lv_screen_active()); // the whole display, every layer
lv_refr_now(d);
lvport::s_shot = nullptr;
bool ok = false;
if (FILE* f = fopen(path, "wb")) {
const uint32_t row = (uint32_t)W * 3, size = 54 + row * H; // W*3 is a multiple of 4 at 320