404 lines
11 KiB
C
404 lines
11 KiB
C
/*
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* 模块名称：LCD 绘图模块
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* 模块功能：提供字符、字符串（中英文混合）、线条、矩形、圆形等图形绘制
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* 适用平台：STM32F103C8T6 + ST7735S + 底层 st7735s.c
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* 作者：王建锋
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* 创建日期：2026-07-14
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* 修改记录：
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* 2026-07-14 王建锋 从 st7735s.c 拆分
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*/
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#include "lcd.h"
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#include "lcd_data.h"
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#include "hz16_data.h"
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#include <string.h>
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/*
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* 函数功能：UTF-8字符转Unicode（辅助）
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* 入口参数：str - UTF-8字符串指针（会被推进到下一字符起始）
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* 返回值：Unicode码点，或0（异常/结束）
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* 函数说明：支持1~3字节UTF-8，推进str
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*/
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static uint16_t utf8_to_unicode(const char **str)
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{
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uint16_t code;
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uint8_t c;
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c = (uint8_t)(**str);
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if (c == 0) {
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return 0;
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}
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if (c < 0x80) {
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code = c;
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(*str)++;
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} else if ((c & 0xE0) == 0xC0) {
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code = c & 0x1F;
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(*str)++;
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code = (code << 6) | ((uint8_t)(**str) & 0x3F);
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(*str)++;
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} else if ((c & 0xF0) == 0xE0) {
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code = c & 0x0F;
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(*str)++;
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code = (code << 6) | ((uint8_t)(**str) & 0x3F);
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(*str)++;
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code = (code << 6) | ((uint8_t)(**str) & 0x3F);
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(*str)++;
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} else {
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(*str)++;
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return 0;
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}
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return code;
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}
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/*
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* 函数功能：显示一个8x16 ASCII字符
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* 入口参数：x - 列坐标
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* y - 行坐标
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* ch - 字符 (ASCII 32-126)
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* color - 字符颜色 (RGB565)
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* bg_color - 背景颜色 (RGB565)
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* 返回值：无
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* 函数说明：框选8x16区域→遍历字模bit→发送color或bg_color
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*/
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void lcd_draw_char(uint16_t x, uint16_t y, char ch, uint16_t color, uint16_t bg_color)
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{
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uint16_t i;
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uint16_t j;
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uint8_t line;
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if (ch < 32 || ch > 126) {
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ch = ' ';
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}
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st7735s_set_window(x, y, x + 7, y + 15);
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HAL_GPIO_WritePin(LCD_CS_PORT, LCD_CS_PIN, GPIO_PIN_RESET);
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HAL_GPIO_WritePin(LCD_DC_PORT, LCD_DC_PIN, GPIO_PIN_SET);
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for (i = 0; i < 16; i++) {
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line = LCD_F8x16[ch - 32][i];
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for (j = 0; j < 8; j++) {
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if (line & 0x80) {
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st7735s_spi_write_byte((uint8_t)(color >> 8));
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st7735s_spi_write_byte((uint8_t)(color & 0xFF));
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} else {
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st7735s_spi_write_byte((uint8_t)(bg_color >> 8));
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st7735s_spi_write_byte((uint8_t)(bg_color & 0xFF));
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}
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line <<= 1;
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}
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}
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HAL_GPIO_WritePin(LCD_CS_PORT, LCD_CS_PIN, GPIO_PIN_SET);
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}
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/*
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* 函数功能：显示字符串
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* 入口参数：x - 列坐标
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* y - 行坐标
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* str - 字符串指针
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* color - 字符颜色 (RGB565)
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* bg_color - 背景颜色 (RGB565)
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* 返回值：无
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* 函数说明：连续显示字符串，自动换行
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*/
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void lcd_draw_string(uint16_t x, uint16_t y, const char *str, uint16_t color, uint16_t bg_color)
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{
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uint16_t start_x = x;
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while (*str != '\0') {
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if (*str == '\n') {
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y += FONT_HEIGHT_16;
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x = start_x;
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str++;
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continue;
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}
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if (x + 8 > s_lcd_width) {
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y += FONT_HEIGHT_16;
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x = start_x;
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}
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if (y + 16 > s_lcd_height) {
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break;
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}
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lcd_draw_char(x, y, *str, color, bg_color);
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x += FONT_WIDTH_8;
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str++;
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}
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}
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/*
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* 函数功能：显示一个6x8 ASCII字符
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* 入口参数：x - 列坐标
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* y - 行坐标
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* ch - 字符 (ASCII 32-126)
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* color - 字符颜色 (RGB565)
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* bg_color - 背景颜色 (RGB565)
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* 返回值：无
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* 函数说明：LCD_F6x8为列式存储（每字节一列，bit0=顶行，bit7=底行）
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* 框选6x8区域→逐行逐列取bit→发送color或bg_color
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*/
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void lcd_draw_char_6x8(uint16_t x, uint16_t y, char ch, uint16_t color, uint16_t bg_color)
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{
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uint8_t row;
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uint8_t col;
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uint8_t col_data;
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if (ch < 32 || ch > 126) {
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ch = ' ';
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}
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st7735s_set_window(x, y, x + 5, y + 7);
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HAL_GPIO_WritePin(LCD_CS_PORT, LCD_CS_PIN, GPIO_PIN_RESET);
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HAL_GPIO_WritePin(LCD_DC_PORT, LCD_DC_PIN, GPIO_PIN_SET);
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for (row = 0; row < 8; row++) {
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for (col = 0; col < 6; col++) {
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col_data = LCD_F6x8[ch - 32][col];
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if (col_data & (1 << row)) {
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st7735s_spi_write_byte((uint8_t)(color >> 8));
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st7735s_spi_write_byte((uint8_t)(color & 0xFF));
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} else {
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st7735s_spi_write_byte((uint8_t)(bg_color >> 8));
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st7735s_spi_write_byte((uint8_t)(bg_color & 0xFF));
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}
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}
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}
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HAL_GPIO_WritePin(LCD_CS_PORT, LCD_CS_PIN, GPIO_PIN_SET);
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}
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/*
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* 函数功能：显示字符串（6x8字体）
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* 入口参数：x - 列坐标
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* y - 行坐标
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* str - 字符串指针
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* color - 字符颜色 (RGB565)
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* bg_color - 背景颜色 (RGB565)
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* 返回值：无
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* 函数说明：连续显示6x8字符，自动换行
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*/
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void lcd_draw_string_6x8(uint16_t x, uint16_t y, const char *str, uint16_t color, uint16_t bg_color)
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{
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uint16_t start_x = x;
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while (*str != '\0') {
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if (*str == '\n') {
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y += FONT_HEIGHT_8;
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x = start_x;
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str++;
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continue;
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}
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if (x + FONT_WIDTH_6 > s_lcd_width) {
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y += FONT_HEIGHT_8;
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x = start_x;
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}
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if (y + FONT_HEIGHT_8 > s_lcd_height) {
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break;
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}
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lcd_draw_char_6x8(x, y, *str, color, bg_color);
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x += FONT_WIDTH_6;
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str++;
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}
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}
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/*
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* 函数功能：显示一个16x16 CJK汉字
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* 入口参数：x - 列坐标
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* y - 行坐标
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* unicode - Unicode码点 (如 0x4E00="一")
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* color - 字符颜色 (RGB565)
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* bg_color - 背景颜色 (RGB565)
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* 返回值：无
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* 函数说明：框选16x16区域→遍历字模bit→发送color或bg_color
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*/
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void lcd_draw_chinese(uint16_t x, uint16_t y, uint16_t unicode,
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uint16_t color, uint16_t bg_color)
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{
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uint16_t i;
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uint16_t j;
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uint8_t k;
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uint8_t line;
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const uint8_t *bitmap;
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bitmap = cjk_get_bitmap(unicode);
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if (bitmap == NULL) {
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return;
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}
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st7735s_set_window(x, y, x + CJK_WIDTH - 1, y + CJK_HEIGHT - 1);
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HAL_GPIO_WritePin(LCD_CS_PORT, LCD_CS_PIN, GPIO_PIN_RESET);
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HAL_GPIO_WritePin(LCD_DC_PORT, LCD_DC_PIN, GPIO_PIN_SET);
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for (i = 0; i < CJK_HEIGHT; i++) {
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for (j = 0; j < CJK_WIDTH / 8; j++) {
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line = bitmap[i * (CJK_WIDTH / 8) + j];
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for (k = 0; k < 8; k++) {
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if (line & 0x80) {
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st7735s_spi_write_byte((uint8_t)(color >> 8));
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st7735s_spi_write_byte((uint8_t)(color & 0xFF));
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} else {
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st7735s_spi_write_byte((uint8_t)(bg_color >> 8));
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st7735s_spi_write_byte((uint8_t)(bg_color & 0xFF));
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}
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line <<= 1;
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}
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}
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}
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HAL_GPIO_WritePin(LCD_CS_PORT, LCD_CS_PIN, GPIO_PIN_SET);
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}
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/*
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* 函数功能：显示UTF-8字符串（自动中英文混合）
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* 入口参数：x - 列坐标
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* y - 行坐标
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* str - UTF-8字符串指针
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* color - 字符颜色 (RGB565)
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* bg_color - 背景颜色 (RGB565)
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* 返回值：无
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* 函数说明：自动识别ASCII(8x16)和CJK(16x16)，自动换行
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*/
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void lcd_draw_chinese_string(uint16_t x, uint16_t y,
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const char *str,
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uint16_t color, uint16_t bg_color)
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{
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uint16_t start_x = x;
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while (*str != '\0') {
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uint8_t c = (uint8_t)(*str);
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if (*str == '\n') {
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y += CJK_HEIGHT;
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x = start_x;
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str++;
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continue;
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}
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if (c < 0x80) {
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if (x + 8 > s_lcd_width) {
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y += CJK_HEIGHT;
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x = start_x;
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}
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if (y + 16 > s_lcd_height) {
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break;
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}
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lcd_draw_char(x, y, (char)c, color, bg_color);
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x += 8;
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str++;
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} else {
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const char *p = str;
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uint16_t unicode = utf8_to_unicode(&p);
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if (unicode == 0) {
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str = p;
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continue;
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}
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if (x + CJK_WIDTH > s_lcd_width) {
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y += CJK_HEIGHT;
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x = start_x;
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}
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if (y + CJK_HEIGHT > s_lcd_height) {
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break;
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}
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lcd_draw_chinese(x, y, unicode, color, bg_color);
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x += CJK_WIDTH;
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str = p;
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}
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}
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}
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/*
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* 函数功能：画线（Bresenham算法）
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* 入口参数：x1 - 起始列
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* y1 - 起始行
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* x2 - 结束列
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* y2 - 结束行
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* color - 颜色 (RGB565)
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* 返回值：无
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*/
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void lcd_draw_line(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color)
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{
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int16_t dx;
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int16_t dy;
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int16_t sx;
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int16_t sy;
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int16_t err;
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int16_t e2;
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int16_t x = (int16_t)x1;
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int16_t y = (int16_t)y1;
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dx = (x1 < x2) ? (int16_t)(x2 - x1) : (int16_t)(x1 - x2);
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dy = (y1 < y2) ? (int16_t)(y2 - y1) : (int16_t)(y1 - y2);
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sx = (x1 < x2) ? 1 : -1;
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sy = (y1 < y2) ? 1 : -1;
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err = dx - dy;
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while (1) {
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st7735s_draw_pixel((uint16_t)x, (uint16_t)y, color);
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if (x == (int16_t)x2 && y == (int16_t)y2) {
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break;
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}
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e2 = 2 * err;
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if (e2 > -dy) {
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err -= dy;
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x += sx;
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}
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if (e2 < dx) {
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err += dx;
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y += sy;
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}
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}
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}
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/*
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* 函数功能：画空心矩形
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* 入口参数：x - 左上角列
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* y - 左上角行
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* width - 宽度
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* height - 高度
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* color - 颜色 (RGB565)
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* 返回值：无
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*/
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void lcd_draw_rect(uint16_t x, uint16_t y, uint16_t width, uint16_t height, uint16_t color)
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{
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uint16_t x2 = x + width - 1;
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uint16_t y2 = y + height - 1;
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lcd_draw_line(x, y, x2, y, color);
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lcd_draw_line(x, y, x, y2, color);
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lcd_draw_line(x2, y, x2, y2, color);
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lcd_draw_line(x, y2, x2, y2, color);
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}
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/*
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* 函数功能：画空心圆（Bresenham算法）
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* 入口参数：x0 - 圆心列
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* y0 - 圆心行
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* radius - 半径
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* color - 颜色 (RGB565)
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* 返回值：无
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*/
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void lcd_draw_circle(uint16_t x0, uint16_t y0, uint16_t radius, uint16_t color)
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{
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int16_t x = 0;
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int16_t y = (int16_t)radius;
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int16_t err = 1 - (int16_t)radius;
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int16_t xc = (int16_t)x0;
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int16_t yc = (int16_t)y0;
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while (x <= y) {
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st7735s_draw_pixel((uint16_t)(xc + x), (uint16_t)(yc + y), color);
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st7735s_draw_pixel((uint16_t)(xc - x), (uint16_t)(yc + y), color);
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st7735s_draw_pixel((uint16_t)(xc + x), (uint16_t)(yc - y), color);
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st7735s_draw_pixel((uint16_t)(xc - x), (uint16_t)(yc - y), color);
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st7735s_draw_pixel((uint16_t)(xc + y), (uint16_t)(yc + x), color);
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st7735s_draw_pixel((uint16_t)(xc - y), (uint16_t)(yc + x), color);
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st7735s_draw_pixel((uint16_t)(xc + y), (uint16_t)(yc - x), color);
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st7735s_draw_pixel((uint16_t)(xc - y), (uint16_t)(yc - x), color);
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x++;
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if (err < 0) {
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err += 2 * x + 1;
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} else {
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y--;
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err += 2 * (x - y) + 1;
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}
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}
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}
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