Add English and Russian README files

2026-06-26 21:32:41 +03:00 · 2026-04-04 20:59:54 +03:00
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+# RP Pico Display Engine
+
+A lightweight C display engine for `RP2040/RP2350` and `ST7789` displays (SPI + DMA) with an explicit `begin/end paint` frame contract.
+
+## Features
+
+- Two modes: `DISPLAY_MODE_SAFE` and `DISPLAY_MODE_RAW`
+- 1 or 2 frame buffers (`buffer_count`)
+- Non-blocking and blocking frame acquisition:
+  - `display_begin_paint_try()`
+  - `display_begin_paint_blocking()`
+- Safe frame completion via `display_end_paint()`
+- Rendering primitives and a font module with Cyrillic support
+
+## Repository Structure
+
+- `include/display/` - public headers for the engine and renderer
+- `src/core/display.c` - display engine core
+- `src/render/` - primitives implementation
+- `include/Font/`, `src/Font/` - font data and text rendering
+- `Examples/Thermometr/` - working Pico SDK example project
+
+## Quick Start
+
+### 1. Safe mode with a single display loop
+
+Good for a simple loop where dropping a frame is acceptable when the buffer is busy.
+
+```c
+#include "display/display.h"
+#include "display/render/context.h"
+
+#define WIDTH  320
+#define HEIGHT 240
+
+void app_loop(void) {
+    display_config_t cfg = {
+        .width = WIDTH,
+        .height = HEIGHT,
+        .buffer_count = 1,
+        .mode = DISPLAY_MODE_SAFE
+    };
+    display_init(&cfg);
+
+    render_ctx_t rc;
+
+    while (1) {
+        uint16_t *buf = display_begin_paint_try();
+        if (!buf) {
+            continue;
+        }
+
+        render_begin(&rc, buf, WIDTH, HEIGHT);
+        render_clear(&rc, RGB16(0, 0, 0));
+        // draw...
+
+        bool ok = display_end_paint();
+        hard_assert(ok);
+    }
+}
+```
+
+### 2. Safe mode with two buffers and deferred submit support
+
+In `SAFE + buffer_count = 2`, DMA can scan out one buffer while you render the other one.  
+If DMA is busy at `display_end_paint()`, the frame may be deferred (single pending-frame queue).
+
+```c
+#include "display/display.h"
+#include "display/render/context.h"
+
+#define WIDTH  320
+#define HEIGHT 240
+
+void app_loop(void) {
+    display_config_t cfg = {
+        .width = WIDTH,
+        .height = HEIGHT,
+        .buffer_count = 2,
+        .mode = DISPLAY_MODE_SAFE
+    };
+    display_init(&cfg);
+
+    render_ctx_t rc;
+
+    while (1) {
+        uint16_t *buf = display_begin_paint_try();
+        if (!buf) {
+            // DMA/queue busy: run other app logic
+            continue;
+        }
+
+        render_begin(&rc, buf, WIDTH, HEIGHT);
+        render_clear(&rc, RGB16(8, 16, 8));
+        // draw...
+
+        bool accepted = display_end_paint();
+        hard_assert(accepted); // false only on contract misuse
+    }
+}
+```
+
+### 3. Primitive and font headers + output example
+
+Minimal include set:
+
+```c
+#include "display/display.h"
+#include "display/renderer.h"          // aggregates context + line + grid + sine_wave + bezier
+#include "Font/font_data.h"            // draw_string(), draw_char(), get_char_width()
+```
+
+Equivalent per-header includes:
+
+```c
+#include "display/render/context.h"
+#include "display/render/line.h"
+#include "display/render/grid.h"
+#include "display/render/sine_wave.h"
+#include "display/render/bezier.h"
+#include "Font/font_data.h"
+```
+
+Primitive + text render example:
+
+```c
+render_ctx_t rc;
+render_begin(&rc, buf, 320, 240);
+
+render_clear(&rc, RGB16(9, 19, 9));
+render_grid(&rc, 20, 20, 40, RGB16(12, 26, 13));
+render_line(&rc, 0, 0, 319, 239, RGB16(255, 0, 0));
+render_sine_wave(&rc, 960, 100, 2.0f, 0, 120, phase, RGB16(0, 255, 0));
+
+int px[4] = {20, 80, 140, 220};
+int py[4] = {200, 120, 220, 160};
+render_bezier(&rc, px, py, 4, RGB16(255, 255, 0));
+
+draw_string(&rc, 16, 16, L"Cyrillic check", RGB565(255, 255, 255));
+```
+
+## Build Example (Pico SDK)
+
+```bash
+cd Examples/Thermometr
+mkdir -p build && cd build
+cmake ..
+cmake --build .
+```
+
+Display pins are configured in `Examples/Thermometr/CMakeLists.txt` via `target_compile_definitions(...)`:
+`SPI_PORT`, `PIN_MOSI`, `PIN_SCK`, `PIN_CS`, `PIN_DC`, `PIN_RST`, `PIN_BL`.
+
+## API Contract (Important)
+
+- Every successful `display_begin_paint_*()` must be followed by `display_end_paint()`
+- Do not call a second `begin` until the current paint section is closed
+- Do not call `display_submit()` manually inside an open paint section
+
+Detailed usage scenarios: `SCENARIOS.ru.md`.