stm32 controls lcd to write characters, draw lines, Chinese characters, etc.

         When drawing a straight line, due to the granularity of the display on the LCD, the problem of the pace of the x and y axes is distinguished. The problem of pace involves the problem of slope. Therefore, even if the line drawing algorithm is completed, it is necessary to pay attention to the direction of the x and y axes relative to the LCD. Now a relatively rough line drawing algorithm is implemented.

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))

         {

                   //Draw the origin

                   LCD_open_windows(x1,y1,1,1);    

         }

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

         {

                 //Move along the y axis, determine the size and swap

                   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);

                   }

         }

}

         The main thing is to pay attention to the slope problem and understand the properties of LCD. The slope is greater than 1. You must know that only by moving along the y-axis can the x-axis be dense without an obvious breakpoint.

2. Write in ascii.

To write ASCII, you can first make a font, take the corresponding font, such as 8 * 16. Since the principle of writing ASCII on LCD is mainly to dot, you can write a simple program for A.

unsigned char code_A[]=

{

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

; If the data is garbled, please check the font format settings and pay attention to selecting the correct modulus direction and byte order.

; Source file / text: A

; Width × height (pixels): 8×16

; Font format/size: monochrome dot matrix LCD font, horizontal mode, byte positive order/16 bytes

; Data conversion date: 2015/2/10 15:00:31

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

//0x08,0x10,0x01, //Number of pixels in width, number of pixels in height, number of bytes in width, parameter settings are optional

0x00,0x00,0x00,0x08,0x08,0x0C,0x14,0x14,0x12,0x1E,0x22,0x21,0x21,0x73,0x00,0x00,

};

//8 * 16 ascii characters

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);         

                            }

                   }       

    }                           

}

The main principle is to get the value of each bit to be displayed, and if it is 1, just write the corresponding value.

unsigned char code_A_24x48[]=

{

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

; If the data is garbled, please check the font format settings and pay attention to selecting the correct modulus direction and byte order.

; Source file / text: A

; Width × height (pixels): 24×48

; Font format/size: monochrome dot matrix LCD font, horizontal mode, byte sequence/144 bytes

; Data conversion date: 2015/2/10 15:09:19

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

//0x18,0x30,0x03, //Number of pixels in width, number of pixels in height, number of bytes in width, parameter settings are optional

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. Write Chinese characters

unsigned char yuan[]=

{

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

; If the data is garbled, please check the font format settings and pay attention to selecting the correct modulus direction and byte order.

; Source file / text: Yuan

; Width × height (pixels): 48 × 48

; Font format/size: monochrome dot matrix LCD font, horizontal mode, byte positive sequence/288 bytes

; Data conversion date: 2015/2/10 13:17:47

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

//0x30,0x30,0x06, //Number of pixels in width, number of pixels in height, number of bytes in width, parameter settings are optional

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 displays 48 * 48 characters

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);

                                     }

                      }

                   }

    }

}