abstracting display, touch and sd

display/low_level_display_epaper.cpp

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+#include "low_level_display_epaper.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// Note: This is a placeholder implementation
+// You'll need to add the actual e-paper driver code to lib/epaper/
+
+LowLevelDisplayEPaper::LowLevelDisplayEPaper(const epaper_config* cfg, int w, int h)
+    : config(cfg), width(w), height(h), initialized(false), framebuffer(nullptr), dirty(false) {
+    
+    // Allocate framebuffer (1 bit per pixel for monochrome e-paper)
+    int buffer_size = (width * height + 7) / 8;  // Round up to nearest byte
+    framebuffer = (uint8_t*)malloc(buffer_size);
+    if (framebuffer) {
+        memset(framebuffer, 0xFF, buffer_size);  // White
+    }
+}
+
+LowLevelDisplayEPaper::~LowLevelDisplayEPaper() {
+    if (framebuffer) {
+        free(framebuffer);
+    }
+}
+
+bool LowLevelDisplayEPaper::init() {
+    if (initialized) {
+        return true;
+    }
+    
+    if (!framebuffer) {
+        printf("Failed to allocate framebuffer for e-paper display\n");
+        return false;
+    }
+    
+    // TODO: Implement e-paper initialization
+    // epaper_init(config, width, height);
+    printf("E-paper display initialized: %dx%d (stub)\n", width, height);
+    initialized = true;
+    return false;  // Return false until actual driver is implemented
+}
+
+void LowLevelDisplayEPaper::clear(bool white) {
+    if (!framebuffer) return;
+    
+    int buffer_size = (width * height + 7) / 8;
+    memset(framebuffer, white ? 0xFF : 0x00, buffer_size);
+    dirty = true;
+}
+
+void LowLevelDisplayEPaper::draw_pixel(int x, int y, bool white) {
+    if (!framebuffer || x < 0 || x >= width || y < 0 || y >= height) {
+        return;
+    }
+    
+    int byte_index = (y * width + x) / 8;
+    int bit_index = 7 - ((y * width + x) % 8);
+    
+    if (white) {
+        framebuffer[byte_index] |= (1 << bit_index);
+    } else {
+        framebuffer[byte_index] &= ~(1 << bit_index);
+    }
+    
+    dirty = true;
+}
+
+void LowLevelDisplayEPaper::draw_buffer(const uint8_t* bit_buffer) {
+    if (!bit_buffer || !framebuffer) return;
+    
+    // Direct copy of 1-bit buffer
+    int buffer_size = (width * height + 7) / 8;
+    memcpy(framebuffer, bit_buffer, buffer_size);
+    dirty = true;
+}
+
+void LowLevelDisplayEPaper::refresh() {
+    if (!dirty || !framebuffer) {
+        return;
+    }
+    
+    // TODO: Implement actual e-paper refresh
+    // epaper_update(framebuffer);
+    printf("E-paper refresh (stub)\n");
+    
+    dirty = false;
+}
+
+void LowLevelDisplayEPaper::clear_display() {
+    clear(true);  // Fill with white
+    refresh();
+}
+
+void LowLevelDisplayEPaper::sleep() {
+    // TODO: Implement e-paper sleep mode
+    // epaper_sleep();
+}