fix: screen freeze issue && optimize sram usage

[Lu1zz]

Summary by CodeRabbit

• Refactor
  • Reduced the font cache size, which may affect how many fonts can be cached simultaneously.
  • Improved consistency in address generation by updating default context handling.
  • Updated address display logic to use a different context for certain operations.

[coderabbitai]

Walkthrough

The font cache size constant in the LVGL header was reduced from 64 to 32. In the address manager, the default context for generating addresses was changed to use a dummy context from the wire module. In the homescreen script, the context passed to the address retrieval function was switched from a dummy context to a QR context.

Changes

Files/Paths	Change Summary
core/embed/lvgl/lv_font_ex.h	Reduced FONT_CACHE_NUM from 64 to 32.
core/src/trezor/lvglui/scrs/address.py	Changed default ctx in generate_address to wire.DUMMY_CONTEXT.
core/src/trezor/lvglui/scrs/homescreen.py	Switched context in btc_get_address from DummyContext to QRContext.

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📜 Recent review details

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Review profile: CHILL
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📥 Commits

Reviewing files that changed from the base of the PR and between f484f52 and 5658ee5.

📒 Files selected for processing (3)

• core/embed/lvgl/lv_font_ex.h (1 hunks)
• core/src/trezor/lvglui/scrs/address.py (1 hunks)
• core/src/trezor/lvglui/scrs/homescreen.py (1 hunks)

🧰 Additional context used

🧬 Code Graph Analysis (1)

core/src/trezor/lvglui/scrs/homescreen.py (1)

core/src/trezor/wire/__init__.py (1)

• QRContext (140-219)

⏰ Context from checks skipped due to timeout of 90000ms (3)

• GitHub Check: Gen check
• GitHub Check: Defs check
• GitHub Check: Style check

🔇 Additional comments (3)

core/embed/lvgl/lv_font_ex.h (1)

32-32: Reduced font cache size from 64 to 32.

The change aligns with PR objectives to fix screen freeze and optimize SRAM usage.

core/src/trezor/lvglui/scrs/homescreen.py (1)

710-710: Switch to QRContext looks good.

The change from DummyContext to QRContext aligns with the PR's screen freeze fix objective.

core/src/trezor/lvglui/scrs/address.py (1)

681-681: Good SRAM optimization.

Changed default context from None to wire.DUMMY_CONTEXT to reuse existing object. Saves memory.

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