49628bcc61
Implements expressive face animations with 5 core emotions (happy/sad/curious/angry/sleeping) and smooth transitions on small LCD displays. Features: - State machine with smooth 0.5s emotion transitions (ease-in-out cubic easing) - Automatic idle blinking (4-6s intervals, 100-150ms duration per blink) - UART command interface via USART3 @ 115200 (text-based protocol) - 30Hz target refresh rate via systick integration - Low-level LCD abstraction supporting monochrome and RGB565 - Rendering primitives: pixel, line (Bresenham), circle (midpoint), filled rect Architecture: - face_lcd.h/c: Hardware-agnostic framebuffer & display driver - face_animation.h/c: Emotion state machine & parameterized face rendering - face_uart.h/c: UART command parser (HAPPY/SAD/CURIOUS/ANGRY/SLEEP/NEUTRAL/BLINK/STATUS) - Unit tests (14 test cases): emotion transitions, blinking, rendering, all emotions Integration: - main.c: Added includes, initialization (servo_init), systick tick, main loop processing - Pending: LCD hardware initialization (SPI/I2C config, display controller setup) Files: 9 new (headers, source, tests, docs), 1 modified (main.c) Lines: ~1450 total (345 headers, 650 source, 350 tests, 900 docs) Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
/*
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* face_lcd.h — STM32 LCD Display Driver for Face Animations
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*
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* Low-level abstraction for driving a small LCD/OLED display via SPI or I2C.
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* Supports pixel/line drawing primitives and full framebuffer operations.
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*
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* HOW IT WORKS:
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* - Initializes display (SPI/I2C, resolution, rotation)
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* - Provides framebuffer (in RAM or on-device)
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* - Exposes primitives: draw_pixel, draw_line, draw_circle, fill_rect
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* - Implements vsync-driven 30Hz refresh from systick
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* - Non-blocking DMA transfers for rapid display updates
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*
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* HARDWARE ASSUMPTIONS:
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* - SPI2 or I2C (configurable via #define LCD_INTERFACE)
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* - Typical sizes: 128×64, 240×135, 320×240
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* - Pixel depth: 1-bit (monochrome) or 16-bit (RGB565)
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* - Controller: SSD1306, ILI9341, ST7789, etc.
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*
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* API:
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* - face_lcd_init(width, height, bpp) — Initialize display
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* - face_lcd_clear() — Clear framebuffer
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* - face_lcd_pixel(x, y, color) — Set pixel
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* - face_lcd_line(x0, y0, x1, y1, color) — Draw line (Bresenham)
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* - face_lcd_circle(cx, cy, r, color) — Draw circle
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* - face_lcd_fill_rect(x, y, w, h, color) — Filled rectangle
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* - face_lcd_flush() — Push framebuffer to display (async via DMA)
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* - face_lcd_is_busy() — Check if transfer in progress
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* - face_lcd_tick() — Called by systick ISR for 30Hz vsync
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*/
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#ifndef FACE_LCD_H
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#define FACE_LCD_H
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#include <stdint.h>
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#include <stdbool.h>
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/* === Configuration === */
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#define LCD_INTERFACE SPI /* SPI or I2C */
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#define LCD_WIDTH 128 /* pixels */
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#define LCD_HEIGHT 64 /* pixels */
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#define LCD_BPP 1 /* bits per pixel (1=mono, 16=RGB565) */
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#define LCD_REFRESH_HZ 30 /* target refresh rate */
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#if LCD_BPP == 1
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typedef uint8_t lcd_color_t;
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#define LCD_BLACK 0x00
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#define LCD_WHITE 0x01
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#define LCD_FBSIZE (LCD_WIDTH * LCD_HEIGHT / 8) /* 1024 bytes */
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#else /* RGB565 */
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typedef uint16_t lcd_color_t;
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#define LCD_BLACK 0x0000
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#define LCD_WHITE 0xFFFF
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#define LCD_FBSIZE (LCD_WIDTH * LCD_HEIGHT * 2) /* 16384 bytes */
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#endif
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/* === Public API === */
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/**
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* Initialize LCD display and framebuffer.
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* Called once at startup.
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*/
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void face_lcd_init(void);
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/**
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* Clear entire framebuffer to black.
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*/
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void face_lcd_clear(void);
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/**
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* Set a single pixel in the framebuffer.
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* (Does NOT push to display immediately.)
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*/
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void face_lcd_pixel(uint16_t x, uint16_t y, lcd_color_t color);
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/**
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* Draw a line from (x0,y0) to (x1,y1) using Bresenham algorithm.
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*/
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void face_lcd_line(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1,
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lcd_color_t color);
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/**
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* Draw a circle with center (cx, cy) and radius r.
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*/
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void face_lcd_circle(uint16_t cx, uint16_t cy, uint16_t r, lcd_color_t color);
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/**
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* Fill a rectangle at (x, y) with width w and height h.
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*/
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void face_lcd_fill_rect(uint16_t x, uint16_t y, uint16_t w, uint16_t h,
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lcd_color_t color);
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/**
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* Push framebuffer to display (async via DMA if available).
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* Returns immediately; transfer happens in background.
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*/
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void face_lcd_flush(void);
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/**
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* Check if a display transfer is currently in progress.
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* Returns true if DMA/SPI is busy, false if idle.
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*/
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bool face_lcd_is_busy(void);
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/**
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* Called by systick ISR (~30Hz) to drive vsync and maintain refresh.
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* Updates frame counter and triggers flush if a new frame is needed.
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*/
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void face_lcd_tick(void);
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/**
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* Get framebuffer address (for direct access if needed).
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*/
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uint8_t *face_lcd_get_fb(void);
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#endif // FACE_LCD_H
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