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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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tools/screenshot.py
+12 -2
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@@ -30,6 +30,7 @@ RESP_CODE_ERR = 1
# display_type values (byte [5] in response frame)
DISPLAY_TYPE_OLED = 0 # page-based, column-major (SH1106/SSD1306)
DISPLAY_TYPE_EINK = 1 # row-major, MSB-first, 1=white/0=black (GxEPD2)
DISPLAY_TYPE_RGB565 = 2 # row-major, 16-bit little-endian (colour screens, e.g. Wio Tracker L2)
# No panel-specific constants needed — the firmware now sends GxEPD2's own reported
# dimensions (which use WIDTH_VISIBLE, not the full physical WIDTH), so the header
@@ -114,6 +115,8 @@ def _u16le(buf, off):
def _expected_buffer_size(width, height, display_type):
"""Bytes the firmware should send for given dims+type."""
if display_type == DISPLAY_TYPE_RGB565:
return width * height * 2
if display_type == DISPLAY_TYPE_EINK:
# GxEPD2 buffer is in physical panel coordinates: row-major,
# stride = ceil(WIDTH_VISIBLE / 8) bytes, HEIGHT rows.
@@ -285,9 +288,16 @@ def eink_buffer_to_image(buffer, log_width, log_height, rotation):
return image
def rgb565_buffer_to_image(buffer, width, height):
"""Colour screen: RGB565 little-endian, row-major."""
return Image.frombuffer("RGB", (width, height), bytes(buffer), "raw", "BGR;16", 0, 1)
def buffer_to_image(buffer, width, height, display_type, rotation=0, scale=1):
"""Convert framebuffer to PIL Image, optionally upscaled."""
if display_type == DISPLAY_TYPE_EINK:
if display_type == DISPLAY_TYPE_RGB565:
image_rgb = rgb565_buffer_to_image(buffer, width, height)
elif display_type == DISPLAY_TYPE_EINK:
image_rgb = eink_buffer_to_image(buffer, width, height, rotation)
else:
image_rgb = oled_buffer_to_image(buffer, width, height)
@@ -357,7 +367,7 @@ def main():
result = receive_screenshot(ser)
if result:
buffer_data, width, height, display_type, disp_rotation = result
type_str = "e-ink" if display_type == DISPLAY_TYPE_EINK else "OLED"
type_str = {DISPLAY_TYPE_EINK: "e-ink", DISPLAY_TYPE_RGB565: "colour"}.get(display_type, "OLED")
print(
f"Received framebuffer: {width}x{height} {type_str} rot={disp_rotation}, {len(buffer_data)} bytes"
)