abstracting display, touch and sd

display/low_level_display_st7796.cpp

@@ -0,0 +1,77 @@
+#include "low_level_display_st7796.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+// RGB565 color definitions
+#define COLOR_BLACK   0x0000
+#define COLOR_WHITE   0xFFFF
+
+LowLevelDisplayST7796::LowLevelDisplayST7796(const st7796_config* cfg, int w, int h)
+    : config(cfg), width(w), height(h), initialized(false) {
+}
+
+LowLevelDisplayST7796::~LowLevelDisplayST7796() {
+    // Cleanup if needed
+}
+
+bool LowLevelDisplayST7796::init() {
+    if (initialized) {
+        return true;
+    }
+    
+    st7796_init(config, width, height);
+    initialized = true;
+    printf("ST7796 display initialized: %dx%d\n", width, height);
+    return true;
+}
+
+void LowLevelDisplayST7796::clear(bool white) {
+    st7796_fill(white ? COLOR_WHITE : COLOR_BLACK);
+}
+
+void LowLevelDisplayST7796::draw_pixel(int x, int y, bool white) {
+    st7796_draw_pixel(x, y, white ? COLOR_WHITE : COLOR_BLACK);
+}
+
+void LowLevelDisplayST7796::draw_buffer(const uint8_t* bit_buffer) {
+    if (!bit_buffer) return;
+    
+    // Allocate RGB565 buffer for entire screen
+    uint16_t *rgb_buffer = (uint16_t *)malloc(width * height * sizeof(uint16_t));
+    if (!rgb_buffer) {
+        printf("Error: Failed to allocate RGB buffer\n");
+        return;
+    }
+    
+    // Convert 1-bit buffer to RGB565
+    for (int y = 0; y < height; y++) {
+        for (int x = 0; x < width; x++) {
+            int byte_index = (y * width + x) / 8;
+            int bit_index = 7 - (x % 8);
+            bool pixel_white = (bit_buffer[byte_index] >> bit_index) & 0x01;
+            rgb_buffer[y * width + x] = pixel_white ? COLOR_WHITE : COLOR_BLACK;
+        }
+    }
+    
+    // Draw entire buffer at once
+    st7796_set_cursor(0, 0);
+    st7796_write(rgb_buffer, width * height);
+    
+    free(rgb_buffer);
+}
+
+void LowLevelDisplayST7796::refresh() {
+    // ST7796 updates immediately, no refresh needed
+}
+
+void LowLevelDisplayST7796::set_backlight(bool on) {
+    // ST7796 driver doesn't have backlight control yet
+    // TODO: Add GPIO control for backlight pin
+    (void)on;
+}
+
+void LowLevelDisplayST7796::set_rotation(uint8_t rotation) {
+    // ST7796 driver doesn't have rotation control yet
+    // TODO: Add MADCTL register manipulation for rotation
+    (void)rotation;
+}