45 lines
1.7 KiB
Markdown
45 lines
1.7 KiB
Markdown
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# 编码实现 - LCD 显示与字模驱动 (docs/60_coding/mod-lcd.md)
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本文件对应 LCD 驱动与字模渲染的具体编码实现细节。
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## 1. 对应代码源文件
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* [Drivers/lcd.c](file:///c:/workfile/105/stc32g12k128/Drivers/lcd.c) (LCD 初始化、SPI 数据写、画图画字函数)
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* [Drivers/lcd.h](file:///c:/workfile/105/stc32g12k128/Drivers/lcd.h) (管脚接口与画图画字声明)
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* [Drivers/lcd_font.h](file:///c:/workfile/105/stc32g12k128/Drivers/lcd_font.h) (ASCII 8x16 点阵字模与图标数据)
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## 2. 关键代码片段与逻辑实现
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### 2.1 局部窗口设置 (X轴偏移量修正)
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在 `lcd.c` 中配置窗口时，需要向 X 轴坐标加上 4 像素偏差：
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```c
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void LCD_SetWindow(u16 x1, u16 y1, u16 x2, u16 y2) {
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x1 += 4;
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x2 += 4;
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LCD_WriteCmd(0x2A); // Column Address Set
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LCD_WriteData(x1 >> 8);
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LCD_WriteData(x1 & 0xFF);
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LCD_WriteData(x2 >> 8);
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LCD_WriteData(x2 & 0xFF);
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LCD_WriteCmd(0x2B); // Row Address Set
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LCD_WriteData(y1 >> 8);
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LCD_WriteData(y1 & 0xFF);
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LCD_WriteData(y2 >> 8);
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LCD_WriteData(y2 & 0xFF);
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}
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```
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### 2.2 电池图标与百分比坐标对齐
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在 `main.c` 的时钟重绘函数中，通过以下坐标绘制电量：
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```c
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// 绘制百分比字符
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LCD_ShowString(62, 24, "85%", WHITE, BLACK);
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// 绘制电池位图
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LCD_ShowImage(92, 27, 24, 12, BATTERY_ICON, RED, BLACK);
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```
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两者 Y 轴保持 24 与 27 对齐，X 轴保持 30 像素的安全边距（62 + 3 * 8 = 86，与 92 之间有 6 像素的安全间距），防止文字错乱或重合。
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### 2.3 字模百分号偏置
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在 `lcd_font.h` 的 ASCII 字符数组中，百分号 `%`（十进制 37，十六进制 0x25）的字模通过在字模绘制时向上平移 2 像素对齐普通数字的下基准线。
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