stm32控制lcd写字符，画线，汉字等
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对于画直线，在lcd上由于显示的粒度问题，就区别到x,y轴上的步调问题。涉及到步调问题，就牵扯到，斜率问题。因此，画线算法就算将就完成了，还要注意相对于lcd来说，x,y轴又是什么一个方向。现实现一个比较粗略的画线算法。
本文引用地址：https://www.eepw.com.cn/article/201612/325183.htmvoid lcd_line(u16 x1,u16 y1,u16 x2,u16 y2,u16 Color)
{
u16 temp,x,y;
Set_direction(0);
if((x1 == x2) && (y1 == y2))
{
//画原点
LCD_open_windows(x1,y1,1,1);
}
else if(abs(y1-y2)>abs(x1-x2))
{
//走y轴,同时判断大小，进行交换
if(y1 > y2)
{
x1 ^= x2 ^= x1 ^= x2;
y1 ^= y2 ^= y1 ^= y2;
}
for( y = y1 ; y <= y2; y ++)
{
x = x1 + (y - y1) * (x2 - x1) / (y2 - y1);
LCD_ColorPoint(x ,y ,Color);
}
}
else
{
if(x1 > x2)
{
x1 ^= x2 ^= x1 ^= x2;
y1 ^= y2 ^= y1 ^= y2;
}
for( x = x1 ; x <= x2; x ++)
{
y = y1 + (x - x1) * (y2 - y1) / (x2 - x1);
LCD_ColorPoint(x ,y ,Color);
}
}
}
主要是要关注，斜率问题，以及了解lcd的属性，斜率大于1，要知道，走y轴，才能密集x轴，而不会出现一个明显的断点。
2、写ascii。
对应写ascii，可以先做一个字模,取对应的字模，如8 * 16,由于lcd写ascii的原理，主要是打点,因此，可以对A写一个简单的程序
unsigned char code_A[]=
{
/*------------------------------------------------------------------------------
;若数据乱码，请检查字模格式设置，注意选择正确的取模方向和字节位顺序。
;源文件/文字: A
;宽×高（像素）: 8×16
;字模格式/大小:单色点阵液晶字模，横向取模，字节正序/16字节
;数据转换日期 : 2015/2/10 15:00:31
------------------------------------------------------------------------------*/
//0x08,0x10,0x01,//宽的像素数,高的像素数，宽的字节数，参数设置可选
0x00,0x00,0x00,0x08,0x08,0x0C,0x14,0x14,0x12,0x1E,0x22,0x21,0x21,0x73,0x00,0x00,
};
//8 * 16的ascii字符
void lcd_ascii(u16 x,u16 y,const u8 *str,u16 Color)
{
u8 i , j;
u8 temp;
for (i = 0;i < 16 ; i ++)
{
temp = str[i];
for(j = 0 ;j < 8 ; j ++)
{
if((temp >> (7 - j) ) & 0x01 == 0x01)
{
LCD_ColorPoint(x + (j) ,y + i,Color);
}
}
}
}
主要原理是，取得要显示的每一位值，是1写对应的值即可。
unsigned char code_A_24x48[]=
{
/*------------------------------------------------------------------------------
;若数据乱码，请检查字模格式设置，注意选择正确的取模方向和字节位顺序。
;源文件/文字: A
;宽×高（像素）: 24×48
;字模格式/大小:单色点阵液晶字模，横向取模，字节正序/144字节
;数据转换日期 : 2015/2/10 15:09:19
------------------------------------------------------------------------------*/
//0x18,0x30,0x03,//宽的像素数,高的像素数，宽的字节数，参数设置可选
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00,0x00,0x38,0x00,0x00,0x3C,0x00,0x00,0x7C,
0x00,0x00,0x7C,0x00,0x00,0x7C,0x00,0x00,0x6C,0x00,0x00,0xCE,0x00,0x00,0xCE,0x00,
0x00,0xCE,0x00,0x00,0xC6,0x00,0x01,0x87,0x00,0x01,0x87,0x00,0x01,0x87,0x00,0x01,
0x83,0x00,0x03,0x03,0x80,0x03,0x03,0x80,0x03,0x03,0x80,0x03,0x03,0x80,0x06,0x01,
0xC0,0x07,0xFF,0xC0,0x06,0x01,0xC0,0x06,0x01,0xC0,0x0C,0x01,0xE0,0x0C,0x00,0xE0,
0x0C,0x00,0xE0,0x0C,0x00,0xE0,0x18,0x00,0xF0,0x18,0x00,0x70,0x18,0x00,0x70,0x18,
0x00,0x70,0x38,0x00,0x78,0xFE,0x01,0xFE,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
};
void lcd_ascii_24x48(u16 x,u16 y,const u8 *str,u16 Color)
{
u8 i,j,k;
u8 buffer[3];
for (i = 0;i < 48 ; i ++)
{
for(j = 0; j < 3 ; j ++)
{
buffer[j] = str[i * 3 + j];
}
for( j = 0; j < 3 ; j ++)
{
for (k = 0 ; k < 8 ; k++)
{
if( ( buffer[j] >> (7 - k)) & 0x01 == 0x01)
{
LCD_ColorPoint(x + 8 * (j) + k,y + i,Color);
}
}
}
}
}
3、写汉字
unsigned char yuan[]=
{
/*------------------------------------------------------------------------------
;若数据乱码，请检查字模格式设置，注意选择正确的取模方向和字节位顺序。
;源文件/文字:袁
;宽×高（像素）: 48×48
;字模格式/大小:单色点阵液晶字模，横向取模，字节正序/288字节
;数据转换日期 : 2015/2/10 13:17:47
------------------------------------------------------------------------------*/
//0x30,0x30,0x06,//宽的像素数,高的像素数，宽的字节数，参数设置可选
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,
0x00,0x00,0x00,0x00,0x00,0xF0,0x00,0x00,0x00,0x00,0x00,0xE0,0x00,0x00,0x00,0x00,
0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0xC0,0x0C,0x00,0x00,0x00,0x00,0xC0,0x1E,0x00,
0x00,0x1F,0xFF,0xFF,0xFF,0x00,0x00,0x08,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0xC0,
0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x40,0x00,0x00,
0x00,0xC0,0x00,0xE0,0x07,0xFF,0xFF,0xFF,0xFF,0xF0,0x03,0xFF,0xFF,0xFF,0xFF,0xF8,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x04,0x00,0x00,0x10,0x00,0x00,0x06,0x00,0x00,
0x3C,0x00,0x00,0x07,0xFF,0xFF,0xFC,0x00,0x00,0x07,0x00,0x00,0x38,0x00,0x00,0x07,
0x00,0x00,0x38,0x00,0x00,0x07,0x00,0x00,0x38,0x00,0x00,0x07,0x00,0x00,0x38,0x00,
0x00,0x07,0x00,0x00,0x38,0x00,0x00,0x07,0x00,0x00,0x38,0x00,0x00,0x07,0xFF,0xFF,
0xF8,0x00,0x00,0x07,0xFF,0xFF,0xF8,0x00,0x00,0x07,0x0F,0x10,0x31,0x80,0x00,0x04,
0x1E,0x18,0x03,0xC0,0x00,0x00,0x3C,0x08,0x07,0xE0,0x00,0x00,0x78,0x0C,0x0F,0x00,
0x00,0x00,0xF8,0x06,0x1C,0x00,0x00,0x01,0xF8,0x07,0x70,0x00,0x00,0x07,0xB8,0x03,
0xC0,0x00,0x00,0x0E,0x38,0x01,0xC0,0x00,0x00,0x1C,0x38,0x00,0xE0,0x00,0x00,0x70,
0x38,0x00,0x70,0x00,0x01,0xC0,0x38,0x10,0x7C,0x00,0x03,0x00,0x38,0xE0,0x3F,0x00,
0x0C,0x00,0x3B,0xC0,0x0F,0xE0,0x10,0x00,0x3F,0x00,0x07,0xFC,0x00,0x00,0x7E,0x00,
0x03,0xF0,0x00,0x00,0x38,0x00,0x00,0xE0,0x00,0x00,0x10,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
};
//lcd显示48 * 48字符
void lcd_show_48x48(u16 x,u16 y,const u8 *str,u16 Color)
{
u8 i,j,k;
u8 buffer[6];
for (i = 0;i < 48 ; i ++)
{
for(j = 0; j < 6 ; j ++)
{
buffer[j] = str[i * 6 + j];
}
for( j = 0; j < 6 ; j ++)
{
for (k = 0 ; k < 8 ; k++)
{
if( ( buffer[j] >> 7 - k) & 0x01 == 0x01)
{
LCD_ColorPoint(x + 8 * (j) + k,y + i,Color);
}
}
}
}
}
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