stm32控制lcd寫字符，畫線，漢字等

對于畫直線，在lcd上由于顯示的粒度問題，就區別到x,y軸上的步調問題。涉及到步調問題，就牽扯到，斜率問題。因此，畫線算法就算將就完成了，還要注意相對于lcd來說，x,y軸又是什么一個方向。現實現一個比較粗略的畫線算法。

void lcd_line(u16 x1,u16 y1,u16 x2,u16 y2,u16 Color)

{

u16 temp,x,y;

Set_direction(0);

if((x1 == x2) && (y1 == y2))

{

//畫原點

LCD_open_windows(x1,y1,1,1);

}

else if(abs(y1-y2)>abs(x1-x2))

{

//走y軸,同時判斷大小，進行交換

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);

}

}

}

主要是要關注，斜率問題，以及了解lcd的屬性，斜率大于1，要知道，走y軸，才能密集x軸，而不會出現一個明顯的斷點。

2、寫ascii。

對應寫ascii，可以先做一個字模,取對應的字模，如8 * 16,由于lcd寫ascii的原理，主要是打點,因此，可以對A寫一個簡單的程序

unsigned char code_A[]=

{

/*------------------------------------------------------------------------------

;若數據亂碼，請檢查字模格式設置，注意選擇正確的取模方向和字節位順序。

;源文件/文字: A

;寬×高（像素）: 8×16

;字模格式/大小:單色點陣液晶字模，橫向取模，字節正序/16字節

;數據轉換日期 : 2015/2/10 15:00:31

------------------------------------------------------------------------------*/

//0x08,0x10,0x01,//寬的像素數,高的像素數，寬的字節數，參數設置可選

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，取得要顯示的每一位值，是1寫對應的值即可。

unsigned char code_A_24x48[]=

{

/*------------------------------------------------------------------------------

;若數據亂碼，請檢查字模格式設置，注意選擇正確的取模方向和字節位順序。

;源文件/文字: A

;寬×高（像素）: 24×48

;字模格式/大小:單色點陣液晶字模，橫向取模，字節正序/144字節

;數據轉換日期 : 2015/2/10 15:09:19

------------------------------------------------------------------------------*/

//0x18,0x30,0x03,//寬的像素數,高的像素數，寬的字節數，參數設置可選

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、寫漢字

unsigned char yuan[]=

{

/*------------------------------------------------------------------------------

;若數據亂碼，請檢查字模格式設置，注意選擇正確的取模方向和字節位順序。

;源文件/文字:袁

;寬×高（像素）: 48×48

;字模格式/大小:單色點陣液晶字模，橫向取模，字節正序/288字節

;數據轉換日期 : 2015/2/10 13:17:47

------------------------------------------------------------------------------*/

//0x30,0x30,0x06,//寬的像素數,高的像素數，寬的字節數，參數設置可選

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顯示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);

}

}

}

}

}