ESP8266 UART Reception Has Two Queues, and Only One Contains the Bytes
Trace ESP8266 UART payload and event paths, distinguish stash recovery from FIFO loss, and prevent notification congestion from stranding unread bytes.
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Rust Embedded Graphics Sprite Atlases: Reject Truncated Source Rectangles Before Drawing
Validate sprite catalog rectangles and atlas revisions before SubImage intersections silently reduce an icon to a partial image.
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ESP8266 esp_timer Uses a FreeRTOS Tick Contract, Not ESP32 Microsecond Scheduling
Trace ESP8266 RTOS SDK v3.4 interval rejection and callback-driven periodic rearming before porting ESP32 timing assumptions.
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Rust Embedded Graphics Fixed Point: Review Angular Steps Before Tuning a Gauge
The fixed_point sine path in embedded-graphics 0.8.2 rounds to degree indices. Qualify gauge steps before comparing speed or code size.
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Rust Embedded Graphics Monochrome Ports: Preserve Alarm Meaning Across Color Conversion
See why red alarms can disappear during RGB-to-binary conversion and preserve UI meaning with an explicit monochrome role palette.
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STM32G431 Comparator Blanking and Automatic PWM Restart Need One Timing Review
Review STM32G431 comparator blanking and automatic PWM restart on one timeline, separating raw fault conditions, masked break signals, and deliberate rearm policy.
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Rust Embedded Graphics Custom Fonts: Keep Glyph Indices Matched to the Bitmap
Keep custom MonoFont bitmaps, glyph indices and replacement characters synchronized, and reject stale or out-of-range font mappings.
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STM32F401CCU6 I2C Reads Need Different End Sequences for One Two and Many Bytes
Review STM32F401CCU6 I2C receive endings by transfer length, separating one-byte, two-byte, and final-three-byte sequences from electrical and errata issues.
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Rust Embedded Graphics Raw Images: Validate Row Packing Before Shipping an Asset
Validate ImageRaw row padding, exact byte counts and byte order so a successful draw cannot conceal a malformed Rust firmware asset.
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STM32G431 DMA Buffers in CCM SRAM Need the System Bus Alias
Place STM32G431 DMA buffers through the system-bus CCM alias and audit physical overlap so linker regions do not allocate the same SRAM twice.
