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