1. Simple display test program – to help understand
Modulo characters using PCtoLCD
Any screen is made up of pixels, so displaying the English character ‘A’ works like this:
To display a character, determine the height and width of the character:
- The width of a pixel is half the height;
- The height is 16/24/32 pixels, called the font size (16 pixels in the image above)
Take mold software using PCtoLCD2002 perfect version, attached download link.
The Settings in the mold taking software are as follows:
- Generated data: C51 format:
- Dot matrix format: negative code (negative code is 1 display, 0 do not display);
- Take mold way: line by line
- Mold taking direction: along
- Other Settings: default
Here I’m using a screen resolution of 240240, so we choose to display a 240120 character ‘A’, set the size in the mold software:
There are many generated data, click Save to file:
Change the file name to font_a. h and then change the file format to the following for subsequent use:
const char CH_A[] =
{
// Generated character data
};
Copy the codeWrite programs to display characters
This array has 225 rows of 16 bytes of data per row. Each byte corresponds to whether the 8 pixels are displayed or not. The program then determines whether to write color to the pixels based on this array.
The simple test procedure is as follows:
void LCD_ShowChar(uint16_t x, uint16_t y, char ch, uint16_t back_color, uint16_t font_color, uint8_t font_size)
{
int i = 0, j = 0;
uint8_t temp = 0;
LCD_Address_Set(x, y, x + font_size/2 - 1, y + font_size - 1);//(x,y,x+8-1,y+16-1)
for(i = 0; i <225*16; i++)
{
temp = CH_A[i];
for(j = 0; j < 8; j++) {// Check whether the highest bit of temp is 1
if(temp & 0x80)
{
// Display the dot with the highest bit of 1 and set the color to font color
LCD_Write_2Byte(font_color);
}
else
{
// The highest bit is 0, the point is not displayed, set the point as the background color
LCD_Write_2Byte(back_color);
}
temp <<= 1; }}}Copy the codeCalled in mian.c as follows:
int main(void)
{
HAL_Init();
SystemClock_Config();
LCD_Init();
LCD_ShowChar(60 ,0.'A',BLACK,YELLOW,240);
while (1);
}
Copy the codeAccording to the results
2. Use the English font file “font. H”
The font. H content
When applications need to display only a few characters, you can use the modulus, also very save memory, but when we need to use the uncertainty in the procedure or when a large number of characters, the characters one by one by means of modulus obviously feasible, need to use a has common characters commonly used size pieces to complete the font file, namely the font. J h, See my Github for more details.
Arbitrary character display function based on font. H
First include the character file:
#include "font.h"
Copy the codeThen improve on the function you wrote earlier:
/** * @brief Displays an ASCII character * @param x,y displays the starting coordinate * @param ch Displays the character to be displayed * @param size Font size (16/24/32 font supported) * @return None * @note requires font. H library file support */
void LCD_ShowChar(uint16_t x, uint16_t y, char ch, uint16_t back_color, uint16_t font_color, uint8_t font_size)
{
int i = 0, j = 0;
uint8_t temp = 0;
uint8_t size = 0;
uint8_t t = 0;
/* Check to see if the boundary is crossed */
if((x > (LCD_Width - font_size / 2)) || (y > (LCD_Height - font_size)))
return;
/* Set the memory operation area according to the character size */
LCD_Address_Set(x, y, x + font_size/2 - 1, y + font_size - 1);
/* Computes the offset of a character in the font */
ch = ch - ' ';
/* Display 16 /32 font */
if((font_size == 16) || (font_size == 32)) {/* Count the number of bytes in the bitmap of a font character */
size = (font_size / 8 + ((font_size % 8)?1 : 0)) * (font_size / 2);
for(i = 0; i < size; i++)
{
if(font_size == 16)
temp = asc2_1608[ch][i]; // Call the 1608 font
else if(font_size == 32)
temp = asc2_3216[ch][i]; // Call the 3216 font
else
return; // There is no font library
for(j = 0; j < 8; j++)
{
if(temp & 0x80)
LCD_Write_2Byte(font_color);
else
LCD_Write_2Byte(back_color);
temp <<= 1; }}}/* Displays a 12-point font */
else if(font_size == 12)
{
/* Count the number of bytes in the bitmap of a font character */
size = (font_size / 8 + ((font_size % 8)?1 : 0)) * (font_size / 2);
for(i = 0; i < size; i++)
{
temp = asc2_1206[ch][i];
for(j = 0; j < 6; j++)
{
if(temp & 0x80)
LCD_Write_2Byte(font_color);
else
LCD_Write_2Byte(back_color);
temp <<= 1; }}}/* Displays a 24-point font */
else if(font_size == 24)
{
/* Count the number of bytes in the bitmap of a font character */
size = (font_size * 16) / 8;
for(i = 0; i < size; i++)
{
temp = asc2_2412[ch][i];
if(i % 2= =0)
t = 8;
else
t = 4;
for(j = 0; j < t; j++)
{
if(temp & 0x80)
LCD_Write_2Byte(font_color);
else
LCD_Write_2Byte(back_color);
temp <<= 1; }}}/* Other fonts */
else
return;
}
Copy the codeTest the display of four fonts
int main(void)
{
HAL_Init();
SystemClock_Config();
LCD_Init();
LCD_ShowChar(0.0.'A',BLACK,BLUE,12);
LCD_ShowChar(6.12.'B',BLACK,YELLOW,16);
LCD_ShowChar(14.28.'C',BLACK,GREEN,24);
LCD_ShowChar(26.52.'D',BLACK,PINK,32);
while (1);
}
Copy the codeThe test results
3. String display function
/** * @brief Displays an ASCII character string * @param x,y displays the starting coordinate * @param STR Displays the character string * @param size Font size (16/24/32 font supported) * @return None * @note 1. 2. Do not display characters that exceed the specified width */
void LCD_ShowCharStr(uint16_t x, uint16_t y, uint8_t max_width, char* str, uint16_t back_color, uint16_t font_color, uint8_t font_size)
{
max_width += x;
while((*str <= '~') && (*str >= ' ')) // Check for illegal characters
{
if(x >= max_width)
{
// X direction out of bounds, end
break;
}
LCD_ShowChar(x,y,*str,back_color, font_color,font_size);
x += font_size / 2; str++; }}Copy the codeTest code:
int main(void)
{
HAL_Init();
SystemClock_Config();
LCD_Init();
LCD_ShowChar(0.0.'A',BLACK,BLUE,12);
LCD_ShowChar(6.12.'B',BLACK,YELLOW,16);
LCD_ShowChar(14.28.'C',BLACK,GREEN,24);
LCD_ShowChar(26.52.'D',BLACK,PINK,32);
LCD_ShowCharStr(0.240- 32.240."Mculover666",BLACK,BLUE,32);
while (1);
}
Copy the codeTest results:
