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0.91inch OLED Module, I2C interfaces,

Introduction

0.91inch Module, I2C interfaces, provide Raspberry Pi, STM32, Arduino demos.

Specification

Operating voltage: 3.3V/5V
Interface: I2C
Controller: SSD1306
Resolution: 128x32
Dimension: 36 x 12.5 (mm)

Pinout

PIN	Description
VCC	3.3V/5V Power input
GND	Ground
SDA	Data input
SCL	Clock input

PS: This module has only I2C interface and only four pins

LCD and the controller

SSD1306 is a 128*64 pixel OLED controller, but this OLED only has 128*32 pixels, so this screen only uses the first half of the SSD1306 buffer area.
The OLED supports 8bit 8080 parallel, 8bit 6800 parallel, three-wire SPI, four-wire SPI and I2C communication methods, but considering the size of the module and in order to save the IO resources of the microcontroller, the first four communication methods are discarded. Only supports I2C communication method.

Working Protocol

Note: In I2C communication, first send a 7bit slave device address + 1bit read and write bits, and wait for the response from the device.
After the slave device responds, it then sends a control byte, which determines whether the byte sent later is a command or data, and then waits for the slave device to respond.
After the slave responds again, if senting command, only a one-byte command is sent. If sending data, only one byte can be sent, or multiple bytes of data can be sent in succession, depending on the situation.

User Guides of RPI

Hardware connection

Please connect the LCD to your Raspberry Pi by the 7PIn cable according to the table below:

Connect to Raspberry Pi
OLED	Raspberry Pi
OLED	BCM2835	Board
VCC	3.3V	3.3V
GND	GND	GND
DIN	SDA	3
CLK	SCL	5

Enable SPI and I2C Interface

Open the Raspberry Pi terminal and enter the following command to access the configuration interface:

sudo raspi-config
Select Interfacing Options -> SPI -> Yes to enable the SPI interface

And then reboot the Raspberry Pi:

sudo reboot

Same for I2C, enter the configuration interface and select Interfacing Options -> I2C -> Yes to enable the IIC interface, then reboot.

Install Library

If you use bookworm system, you can only use lgpio library, bcm2835 and wiringPi can't be installed and used.

BCM2835

#Open the Raspberry Pi terminal and run the following command:
wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.71.tar.gz
tar zxvf bcm2835-1.71.tar.gz 
cd bcm2835-1.71/
sudo ./configure && sudo make && sudo make check && sudo make install
#For more, you can refer to the official website: http://www.airspayce.com/mikem/bcm2835/

WiringPi

#Open the Raspberry Pi terminal and run the following command:
cd
sudo apt-get install wiringpi
#For Raspberry Pi systems after May 2019 (earlier than that do not need to execute), an upgrade may be required:
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v
#Run gpio -v and version 2.52 will appear, if it does not appear, it means there is an installation error.

#The Bullseye branch system uses the following command:
git clone https://github.com/WiringPi/WiringPi
cd WiringPi
./build
gpio -v
#Run gpio -v and version 2.70 will appear, if it does not appear, it means there is an installation error.

lgpio

wget https://github.com/joan2937/lg/archive/master.zip
unzip master.zip
cd lg-master
sudo make install 
##For more details, you can refer to https://github.com/gpiozero/lg

Python

sudo apt-get update
sudo apt-get install python3-pip
sudo apt-get install python3-pil
sudo apt-get install python3-numpy
sudo pip3 install spidev
sudo apt-get install python3-smbus

Download the Test Demo

Open the Raspberry Pi terminal and run:

sudo apt-get install p7zip-full
sudo wget https://files.waveshare.com/upload/2/2c/OLED_Module_Code.7z
7z x OLED_Module_Code.7z
cd OLED_Module_Code/RaspberryPi

Run the Test Demo

The following commands should be executed in the RaspberryPi directory, otherwise, the directory will not be indexed.

C

Recompile, which may take a few seconds.

cd c
sudo make clean
sudo make -j 8

Test demos for all screens can be called directly by entering the corresponding size:

sudo ./main #Screen size

Depending on the OLED, one of the following commands should be entered.

#0.49inch OLED Module  
sudo ./main 0.49
------------------------------
#0.91inch OLED Module  
sudo ./main 0.91
------------------------------
#0.95inch RGB OLED (A)/(B)
sudo ./main 0.95rgb
------------------------------
#0.96inch OLED (A)/(B)
sudo ./main 0.96
------------------------------
#0.96inch OLED Module (C)/(D)/(E)
sudo ./main 0.96
------------------------------
#0.96inch RGB OLED Module
sudo ./main 0.96rgb
------------------------------
#1.27inch RGB OLED Module
sudo ./main 1.27rgb
------------------------------
#1.3inch OLED (A)/(B)
sudo ./main 1.3
------------------------------
#1.3inch OLED Module (C)
sudo ./main 1.3c
------------------------------
#1.32inch OLED Module
sudo ./main 1.32
------------------------------
#1.5inch OLED Module
sudo ./main 1.5
------------------------------
#1.5inch OLED Module (B)
sudo ./main 1.5b
------------------------------
#1.5inch RGB OLED Module
sudo ./main 1.5rgb
------------------------------
#1.51inch Transparent OLED
sudo ./main 1.51
------------------------------
#1.54inch OLED Module
sudo ./main 1.54
------------------------------
#2.42inch OLED Module
sudo ./main 2.42

Python

Enter the Python demo directory:

cd python/example

Run the demo corresponding to the OLED model, the demo supports python2/3:

If you have purchased a 1.3inch OLED Module (C), please enter:

# python2
sudo python OLED_1in3_c_test.py
# python3
sudo python3 OLED_1in3_c_test.py

If you have purchased a 1.5inch RGB OLED Module, please enter:

# python2
sudo python OLED_1in5_rgb_test.py
# python3
sudo python3 OLED_1in5_rgb_test.py

Model instruction correspondence table:

#0.49inch OLED Module 
sudo python OLED_0in49_test.py 
------------------------------------
#0.91inch OLED Module 
sudo python OLED_0in91_test.py 
------------------------------------
#0.95inch RGB OLED (A)/(B)
sudo python OLED_0in95_rgb_test.py 
------------------------------------
#0.96inch OLED (A)/(B)
sudo python OLED_0in96_test.py 
------------------------------------
#0.96inch OLED Module (C)/(D)/(E)
sudo python OLED_0in96_test.py 
------------------------------------
#0.96inch RGB OLED Module
sudo python OLED_0in96_rgb_test.py
------------------------------------
#1.27inch RGB OLED Module
sudo python OLED_1in27_rgb_test.py
------------------------------------
#1.3inch OLED (A)/(B)
sudo python OLED_1in3_test.py 
------------------------------------
#1.3inch OLED Module (C)
sudo python OLED_1in3_c_test.py 
------------------------------------
#1.32inch OLED Module
sudo python OLED_1in32_test.py 
------------------------------------
#1.5inch OLED Module
sudo python OLED_1in5_test.py 
------------------------------------
#1.5inch OLED Module (B)
sudo python OLED_1in5_b_test.py 
------------------------------------
#1.5inch RGB OLED Module
sudo python OLED_1in5_rgb_test.py
------------------------------------
#1.51inch Transparent OLED
sudo python OLED_1in51_test.py
------------------------------------
#1.54inch OLED Module
sudo python OLED_1in54_test.py
------------------------------------
#2.42inch OLED Module
sudo python OLED_2in42_test.py

Please make sure that the SPI is not occupied by other devices, you can check in the middle of /boot/config.txt.

Description of C codes (API)

Hardware Interface

1. There are three ways for C to drive: BCM2835 library, WiringPi library and Dev library.
2. We use Dev libraries by default. If you need to change to BCM2835 or WiringPi libraries, please open RaspberryPi\c\Makefile and modify lines 13-15 as follows:

We have carried out the underlying encapsulation because the hardware platform is different, the internal implementation is different. If you need to know the internal implementation, you can go to the corresponding directory.
You can see many definitions in DEV_Config.c(.h), in the directory: RaspberryPi\c\lib\Config.

Interface selection:

#define USE_SPI_4W  1
#define USE_IIC     0
Note: Modify here directly to switch SPI/I2C

Data type:

#define UBYTE      uint8_t
#define UWORD      uint16_t
#define UDOUBLE    uint32_t

Module initialization and exit processing.

void DEV_Module_Init(void);
void DEV_Module_Exit(void);
Note: 
  Here are some GPIO processing before and after using the LCD screen.

Write GPIO:

void DEV_Digital_Write(UWORD Pin, UBYTE Value)
Parameter: 
     UWORD Pin: GPIO Pin number
     UBYTE Value: level to be output, 0 or 1

Read GPIO:

UBYTE DEV_Digital_Read(UWORD Pin)
Parameter:
     UWORD Pin: GPIO Pin number
Return value: 
     level of GPIO, 0 or 1

GPIO mode setting:

void DEV_GPIO_Mode(UWORD Pin, UWORD Mode)
Parameters: 
     UWORD Pin: GPIO Pin number
     UWORD Mode: Mode, 0: input, 1: output

GUI Functions

If you need to draw pictures, display Chinese and English characters, display pictures, etc., we provide some basic functions here about some graphics processing, in the directory RaspberryPi\c\lib\GUI\GUI_Paint.c(.h).

The fonts that GUI depends on can be found in RaspberryPi\c\lib\Fonts directory.

Create Image Properties: Create a new image property, this property includes the image buffer name, width, height, flip angle and color.

void Paint_NewImage(UBYTE *image, UWORD Width, UWORD Height, UWORD Rotate, UWORD Color)
Parameters:
      image: the name of the image buffer, which is actually a pointer to the first address of the image buffer;
      Width: the width of the image buffer;
      Height: the height of the image buffer;
      Rotate: the rotation angle of the image;
      Color: the initial color of the image;

Select image buffer: The purpose of the selection is that you can create multiple image buffers, there can be multiple image buffers, and you can select each image you create.

void Paint_SelectImage(UBYTE *image)
Parameters:
       image: the name of the image buffer, which is actually a pointer to the first address of the image buffer;

Image rotation: Set the rotation angle of the selected image, preferably after Paint_SelectImage(), you can choose to rotate 0, 90, 180, 270 degrees.

void Paint_SetRotate(UWORD Rotate)
Parameters:
        Rotate: ROTATE_0, ROTATE_90, ROTATE_180 and ROTATE_270 correspond to 0, 90, 180 and 270 degrees.

Sets the size of the pixels:

void Paint_SetScale(UBYTE scale)
Parameters:
	scale: the size of pixels, 2: Each pixel occupies one bit; 4: Each pixel occupies two bits.

Image mirror flip: Set the mirror flip of the selected image. You can choose no mirror, horizontal mirror, vertical mirror or image center mirror.

void Paint_SetMirroring(UBYTE mirror)
Parameters:
        Mirror: indicates the image mirroring mode. MIRROR_NONE, MIRROR_HORIZONTAL, MIRROR_VERTICAL, MIRROR_ORIGIN correspond to no mirror, horizontal mirror, vertical mirror and image center mirror respectively.

Set points of the display position and color in the buffer: Here is the core GUI function, processing points display position and color in the buffer.

void Paint_SetPixel(UWORD Xpoint, UWORD Ypoint, UWORD Color)
Parameters:
        Xpoint: the X position of a point in the image buffer
        Ypoint: the Y position of a point in the image buffer
        Color: the color of the dot

Image buffer fill color: Fills the image buffer with a color, usually used to flash the screen into blank.

void Paint_Clear(UWORD Color)
Parameters:
        Color: fill color

The fill color of a certain window in the image buffer: the image buffer part of the window filled with a certain color, usually used to fresh the screen into blank, often used for time display, fresh the last second of the screen.

void Paint_ClearWindows(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color)
Parameters:
        Xstart: the x-starting coordinate of the window
        Ystart: the y-starting coordinate of the window
        Xend: the x-end coordinate of the window
        Yend: the y-end coordinate of the window
        Color: fill color

Draw point: In the image buffer, draw a point on (Xpoint, Ypoint), you can choose the color, the size of the point and the style of the point.

void Paint_DrawPoint(UWORD Xpoint, UWORD Ypoint, UWORD Color, DOT_PIXEL Dot_Pixel, DOT_STYLE Dot_Style)
Parameters:
        Xpoint: the X coordinate of the point.
        Ypoint: the Y coordinate of the point.
        Color: fill color
        Dot_Pixel: The size of the dot, the demo provides 8 size points by default.
              typedef enum {
                 DOT_PIXEL_1X1  = 1,	// 1 x 1
                 DOT_PIXEL_2X2  , 		// 2 X 2
                 DOT_PIXEL_3X3  , 	 	// 3 X 3
                 DOT_PIXEL_4X4  , 	 	// 4 X 4
                 DOT_PIXEL_5X5  , 		// 5 X 5
                 DOT_PIXEL_6X6  , 		// 6 X 6
                 DOT_PIXEL_7X7  , 		// 7 X 7
                 DOT_PIXEL_8X8  , 		// 8 X 8
               } DOT_PIXEL;
        Dot_Style: the style of a point that expands from the center of the point or from the bottom left corner of the point to the right and up.
                 typedef enum {
                     DOT_FILL_AROUND  = 1,
                     DOT_FILL_RIGHTUP,
                  } DOT_STYLE;

Draw line: In the image buffer, draw a line from (Xstart, Ystart) to (Xend, Yend), you can choose the color, the width and the style of the line.

void Paint_DrawLine(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, LINE_STYLE Line_Style, LINE_STYLE Line_Style)
Parameters:
        Xstart: the x-starting coordinate of the line
        Ystart: the y-starting coordinate of the line
        Xend: the x-end coordinate of the line
        Yend: the y-end coordinate of the line
        Color: fill color
        Line_width: The width of the line, the demo provides 8 sizes of width by default.
              typedef enum {
                 DOT_PIXEL_1X1  = 1,	// 1 x 1
                 DOT_PIXEL_2X2  , 		// 2 X 2
                 DOT_PIXEL_3X3  ,		// 3 X 3
                 DOT_PIXEL_4X4  ,		// 4 X 4
                 DOT_PIXEL_5X5  , 		// 5 X 5
                 DOT_PIXEL_6X6  , 		// 6 X 6
                 DOT_PIXEL_7X7  , 		// 7 X 7
                 DOT_PIXEL_8X8  , 		// 8 X 8
              } DOT_PIXEL;
        Line_Style: line style. Select whether the lines are joined in a straight or dashed way.
              typedef enum {
                 LINE_STYLE_SOLID = 0,
                 LINE_STYLE_DOTTED,
              } LINE_STYLE;

Draw rectangle: In the image buffer, draw a rectangle from (Xstart, Ystart) to (Xend, Yend), you can choose the color, the width of the line and whether to fill the inside of the rectangle.

void Paint_DrawRectangle(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, DOT_PIXEL Line_width, DRAW_FILL Draw_Fill)
Parameters:
	Xstart: the starting X coordinate of the rectangle
	Ystart: the starting Y coordinate of the rectangle
	Xend: the x-end coordinate of the rectangle
        Yend: the y-end coordinate of the rectangle
	Color: fill color
	Line_width: The width of the four sides of a rectangle. And the demo provides 8 sizes of width by default.
		typedef enum {
			DOT_PIXEL_1X1  = 1,	// 1 x 1
			DOT_PIXEL_2X2  , 		// 2 X 2
			DOT_PIXEL_3X3  ,		// 3 X 3
			DOT_PIXEL_4X4  ,	        // 4 X 4
			DOT_PIXEL_5X5  , 		// 5 X 5
 			DOT_PIXEL_6X6  , 		// 6 X 6
                        DOT_PIXEL_7X7  , 		// 7 X 7
                        DOT_PIXEL_8X8  , 		// 8 X 8
                 } DOT_PIXEL;
         Draw_Fill: Fill, whether to fill the inside of the rectangle
              typedef enum {
                 	DRAW_FILL_EMPTY = 0,
                 	DRAW_FILL_FULL,
              } DRAW_FILL;

Draw circle: In the image buffer, draw a circle with Radius as the radius and (X_Center, Y_Center) as the center. You can choose the color, the width of the line and whether to fill the inside of the circle.

void Paint_DrawCircle(UWORD X_Center, UWORD Y_Center, UWORD Radius, UWORD Color, DOT_PIXEL Line_width, DRAW_FILL Draw_Fill)
Parameters:
	X_Center: the x-coordinate of the center of the circle
	Y_Center: the y-coordinate of the center of the circle
	Radius: the radius of the circle
	Color: fill color
	Line_width: The width of the arc, with a default of 8 widths
		typedef enum {
        		DOT_PIXEL_1X1  = 1,	// 1 x 1
        		DOT_PIXEL_2X2  , 		// 2 X 2
        		DOT_PIXEL_3X3  ,		// 3 X 3
        		DOT_PIXEL_4X4  ,		// 4 X 4
        		DOT_PIXEL_5X5  , 		// 5 X 5
        		DOT_PIXEL_6X6  , 		// 6 X 6
        		DOT_PIXEL_7X7  , 		// 7 X 7
        		DOT_PIXEL_8X8  , 		// 8 X 8
		} DOT_PIXEL;
	Draw_Fill: fill, whether to fill the inside of the circle
              typedef enum {
              		DRAW_FILL_EMPTY = 0,
                 	DRAW_FILL_FULL,
              } DRAW_FILL;

Write Ascii character: In the image buffer, use (Xstart, Ystart) as the left vertex, and write an Ascii character, you can select Ascii visual character library, font foreground color and font background color.

void Paint_DrawChar(UWORD Xstart, UWORD Ystart, const char Ascii_Char, sFONT* Font, UWORD Color_Foreground, UWORD Color_Background)
Parameters:
	Xstart: the x-coordinate of the left vertex of a character
	Ystart: the y-coordinate of the left vertex of a character
	Ascii_Char: indicates the Ascii character
	Font: Ascii visual character library, in the Fonts folder the demo provides the following Fonts:
  		Font8: 5*8 font
    		Font12: 7*12 font
    		Font16: 11*16 font
    		Font20: 14*20 font
    		Font24: 17*24 font
  	Color_Foreground: font color
  	Color_Background: background color

Write English string: In the image buffer, use (Xstart Ystart) as the left vertex, and write a string of English characters, you can choose Ascii visual character library, font foreground color and font background color.

void Paint_DrawString_EN(UWORD Xstart, UWORD Ystart, const char * pString, sFONT* Font, UWORD Color_Foreground, UWORD Color_Background)
Parameters:
	Xstart: the X coordinate of the left vertex of a character
	Ystart: the Y coordinate of the left vertex of a character
	PString: string, string is a pointer
	Font: Ascii visual character library, in the Fonts folder the demo provides the following Fonts:
     		Font8: 5*8 font
     		Font12: 7*12 font
     		Font16: 11*16 font
     		Font20: 14*20 font
     		Font24: 17*24 font
	Color_Foreground: font color
  	Color_Background: background color

Write Chinese string: In the image buffer, use (Xstart, Ystart) as the left vertex, and write a string of Chinese characters, you can choose GB2312 encoding font, font foreground color and font background color.

void Paint_DrawString_CN(UWORD Xstart, UWORD Ystart, const char * pString, cFONT* font, UWORD Color_Foreground, UWORD Color_Background)
Parameters:
	Xstart: the X coordinate of the left vertex of a character
	Ystart: the Y coordinate of the left vertex of a character
	PString: string, string is a pointer
  	Font: GB2312 encoding character Font library, in the Fonts folder the demo provides the following Fonts:
     		Font12CN: ASCII font 11*21, Chinese font 16*21
     		Font24CN: ASCII font 24*41, Chinese font 32*41
	Color_Foreground: font color
	Color_Background: background color

Write numbers: In the image buffer, use (Xstart, Ystart) as the left vertex, and write a string of numbers, you can choose Ascii visual character library, font foreground color and font background color.

void Paint_DrawNum(UWORD Xpoint, UWORD Ypoint, double Nummber, sFONT* Font, UWORD Digit, UWORD Color_Foreground, UWORD Color_Background)
Parameters:
	Xpoint: the X coordinate of the left vertex of the character
	Ypoint: the Y coordinate of the left vertex of the character
	Nummber: indicates the number displayed, which can be a decimal
	Digit: it's a decimal number
 	Font: Ascii visual character library, in the Fonts folder the demo provides the following Fonts:
   		Font8: 5*8 font
   		Font12: 7*12 font
   		Font16: 11*16 font
		Font20: 14*20 font
   		Font24: 17*24 font
	Color_Foreground: font color
	Color_Background: background color

Display time: In the image buffer, use (Xstart Ystart) as the left vertex, display time, you can choose Ascii visual character font, font foreground color and font background color.

void Paint_DrawTime(UWORD Xstart, UWORD Ystart, PAINT_TIME *pTime, sFONT* Font, UWORD Color_Background, UWORD Color_Foreground)
Parameters:
	Xstart: the X coordinate of the left vertex of the character
 	Ystart: the Y coordinate of the left vertex of the character
	PTime: display time, A time structure is defined here, as long as the hours, minutes and seconds are passed to the parameters;
	Font: Ascii visual character library, in the Fonts folder the demo provides the following Fonts:
     		Font8: 5*8 font
     		Font12: 7*12 font
     		Font16: 11*16 font
     		Font20: 14*20 font
     		Font24: 17*24 font
  	Color_Foreground: font color
  	Color_Background: background color

Python (for Raspberry Pi)

It is compatible with python and python3.
The calls of python are less complex compared to the C demo.

Config.py

Select interface.

Device_SPI = 1
Device_I2C = 0
Note: Modify here to switch SPI/I2C.

Module initialization and exit processing.

def module_init()
def module_exit()
Note:
1. Here are some GPIO processing before and after using the LCD screen.
2. The module_init() function is automatically called in the init () initializer on the LCD, but the module_exit() function needs to be called itself.

SPI writes data.

def spi_writebyte(data)

IIC writes data.

i2c_writebyte(reg, value):

Main.py

The main function, if your Python version is Python2, re-executed in Linux command mode as follows.

sudo python main.py

If your Python version is Python3, re-executed in Linux command mode as follows.

sudo python3 main.py

GUI Functions

Python has an image library PIL official library link, it does not need to write code from the logical layer like C and can directly call the image library for image processing. The following will take a 1.54-inch OLED as an example, we provide a brief description of the demo.

It needs to use the image library and install the library.

sudo apt-get install python3-pil

And then import the library.

from PIL import Image,ImageDraw,ImageFont.

Among them, Image is the basic library, ImageDraw is the drawing function library, and ImageFont is the font library.

Define an image buffer to facilitate drawing, writing and other functions on the image.

image1 = Image.new("1", (disp.width, disp.height), "WHITE")

The first parameter defines the color depth of the image, which is defined as "1" to indicate the bitmap of one-bit depth. The second parameter is a tuple that defines the width and height of the image. The third parameter defines the default color of the buffer, which is defined as "WHITE".

Create a drawing object based on image1, on which all drawing operations will be performed.

draw = ImageDraw.Draw(image1)

Draw a line:

draw.line([(0,0),(127,0)], fill = 0)

The first parameter is a four-element tuple, draw a line starting at (0, 0) and ending at (127,0). "fill =0" means the color of the line is white.

Draw a rectangle:

draw.rectangle([(20,10),(70,60)],fill = "WHITE",outline="BLACK")

The first parameter is a tuple of four elements. (20,10) is the coordinate value in the upper left corner of the rectangle, and (70,60) is the coordinate value in the lower right corner of the rectangle. fill = "WHITE" means white inside, and outline="BLACK" means the color of the outline is black.

Draw a circle:

draw.arc((150,15,190,55),0, 360, fill =(0,255,0)

Draw an inscribed circle in the square, the first parameter is a tuple of 4 elements, with (150, 15) as the upper left corner vertex of the square, (190, 55) as the lower right corner vertex of the square, specifying the level median line of the rectangular frame is the angle of 0 degrees, and the angle becomes larger clockwise; the second parameter indicates the starting angle; the third parameter indicates the ending angle, and fill = 0 indicates that the color of the line is white.
If you are not using the square, what you draw will be an ellipse, which is a drawing of an arc.

Besides the arc function, you can also use the ellipse function for drawing a solid circle.

draw.ellipse((150,65,190,105), fill = 0)

The essence is the drawing of the ellipse. The first parameter specifies the enclosing rectangle.

"fill = 0" means that the inner fill color is white. If its enclosing rectangle is a square, the ellipse is a circle.

Write a character:

The ImageFont module needs to be imported and instantiated:

Font1 = ImageFont.truetype("../Font/Font01.ttf",25)
Font2 = ImageFont.truetype("../Font/Font01.ttf",35)
Font3 = ImageFont.truetype("../Font/Font02.ttf",32)

You can use the fonts of Windows or other fonts which is in ttc format.
Note: Each character library contains different characters; If some characters cannot be displayed, it is recommended that you can refer to the encoding set used.
To draw English characters, you can directly use the fonts; for Chinese characters, you need to add a symbol "u":

draw.text((5, 68), 'Hello world', fill = 0, font=Font1)
text= u"微雪电子"
draw.text((5, 200), text, fill = 0, font=Font3)

The first parameter is a two-element tuple with (5, 68) as the left vertex, and use font1, fill is the font color, fill = 0 means that the font color is white, and the second sentence shows '微雪电子', and its font color is white.

Read local pictures:

image = Image.open('../pic/pic.bmp')

The parameter is the image path.

Other functions:

Python's image library is very powerful, if you need to achieve other features, you can go to the official website to learn: https://pillow.readthedocs.io/en/stable/.

The examples are tested in Arduino UNO, if you want to use other Arduino UNO, you need to change the connection according to the actual boards.

User Guides of Arduino

Hardware Connection

Arduino UNO connection
OLED	UNO
VCC	3.3V/5V
GND	GND
SDA	SDA
SCL	SCL

I2C connection

How to Install Arduino IDE

Arduino IDE Install Guide

Run the demo

Download the demo and find the Arduino demo file directory.
Use Arduino IDE to open the .ino file in the project folder of the corresponding model, recompile, and download the demo to your board.
For example, if you are using the 1.3inch OLED Module (C), open OLED_1in3_c.ino under the \Arduino\OLED_1in3_c directory

Software description

Download the demo on the Resources, and open the Arduino demo file directory, you can see the Arduino program for different models of OLED.

Choose the folder according to the LCD model you are using, and open the xxx.ino file. Take the 1.3-inch OLED Module (C) as an example: open OLED_1in3_c, then double-click OLED_1in3_c.ino to open the Arduino project.

The demo folder of each LCD model can be found in the following table:

LCD Model	Demo File Folder
0.91inch OLED Module	OLED_0in91
0.95inch RGB OLED (A)/(B)	OLED_0in95_rgb
0.96inch OLED (A)/(B)	OLED_0in96
0.96inch OLED Module (C)/(D)/(E)	OLED_0in96
1.27inch RGB OLED Module	OLED_1in27_rgb
1.3inch OLED (A)/(B)	OLED_1in3
1.3inch OLED Module (C)	OLED_1in3_c
1.32inch OLED Module	OLED_1in32
1.5inch OLED Module	OLED_1in5
1.5inch RGB OLED Module	OLED_1in5_rgb

Program description

Underlying hardware interface

Because the hardware platform and the internal implementation are different. If you need to know the internal implementation, you can see many definitions in the directory DEV_Config.c(.h)

Interface selection:

#define USE_SPI_4W 		 1
#define USE_IIC      	         0
#define USE_IIC_SOFT		 0
Note:
    Switch SPI/I2C directly modified here

Data type:

#define UBYTE      uint8_t
#define UWORD      uint16_t
#define UDOUBLE    uint32_t

Module initialization and exit processing:

UBYTE	System_Init(void);
void    System_Exit(void);
Note: 
1. Here is some GPIO processing before and after using the LCD screen.
2. After the System_Exit(void) function is used, the OLED display will be turned off;

Write and read GPIO:

void 	DEV_Digital_Write(UWORD Pin, UBYTE Value);
UBYTE 	DEV_Digital_Read(UWORD Pin);

SPI writes data:

UBYTE	 SPI4W_Write_Byte(uint8_t value);

IIC writes data:

void	 I2C_Write_Byte(uint8_t value, uint8_t Cmd);

The upper application

For the screen, if you need to draw pictures, display Chinese and English characters, display pictures, etc., you can use the upper application to do, and we provide some basic functions here about some graphics processing in the directory STM32\STM32F103RB\User\GUI\GUI_Paint.c(.h)

The character font which GUI dependent is in the directory STM32\STM32F103RB\User\Fonts

New Image Properties: Create a new image property, this property includes the image buffer name, width, height, flip Angle, color.

void Paint_NewImage(UWORD Width, UWORD Height, UWORD Rotate, UWORD Color)
Parameters:
    Width: image buffer Width;
    Height: the Height of the image buffer;
    Rotate: Indicates the rotation Angle of an image
    Color: the initial Color of the image;

Set the clear screen function, usually call the clear function of OLED directly.

void Paint_SetClearFuntion(void (*Clear)(UWORD));
parameter:
    Clear : Pointer to the clear screen function, used to quickly clear the screen to a certain color;

Set the drawing pixel function.

void Paint_SetDisplayFuntion(void (*Display)(UWORD,UWORD,UWORD));
parameter:
    Display: Pointer to the pixel drawing function, which is used to write data to the specified location in the internal RAM of the OLED;

Select image buffer: the purpose of the selection is that you can create multiple image attributes, the image buffer can vary, and you can select each image you create.

void Paint_SelectImage(UBYTE *image)
Parameters:
    Image: the name of the image cache, which is a pointer to the first address of the image buffer

Image Rotation: Set the selected image rotation Angle, preferably after Paint_SelectImage(), you can choose to rotate 0, 90, 180, or 270.

void Paint_SetRotate(UWORD Rotate)
Parameters:
    Rotate: ROTATE_0, ROTATE_90, ROTATE_180, and ROTATE_270 correspond to 0, 90, 180, and 270 degrees respectively;

Image mirror flip: Set the mirror flip of the selected image. You can choose no mirror, horizontal mirror, vertical mirror, or image center mirror.

void Paint_SetMirroring(UBYTE mirror)
Parameters:
    Mirror: indicates the image mirroring mode. MIRROR_NONE, MIRROR_HORIZONTAL, MIRROR_VERTICAL, MIRROR_ORIGIN correspond to no mirror, horizontal mirror, vertical mirror, and about image center mirror respectively.

Set points of display position and color in the buffer: here is the core GUI function, processing points display position and color in the buffer.

void Paint_SetPixel(UWORD Xpoint, UWORD Ypoint, UWORD Color)
Parameters:
    Xpoint: the X position of a point in the image buffer
    Ypoint: Y position of a point in the image buffer
    Color: indicates the Color of the dot

Image buffer fill color: Fills the image buffer with a color, usually used to flash the screen into blank.

void Paint_ClearWindows(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color)
Parameters:
    Xstart: the x-starting coordinate of the window
    Ystart: indicates the Y starting point of the window
    Xend: the x-end coordinate of the window
    Yend: indicates the y-end coordinate of the window
    Color: fill Color

Draw points: In the image buffer, draw points on (Xpoint, Ypoint), you can choose the color, the size of the point, and the style of the point.

void Paint_DrawPoint(UWORD Xpoint, UWORD Ypoint, UWORD Color, DOT_PIXEL Dot_Pixel, DOT_STYLE Dot_Style)
Parameters:
    Xpoint: indicates the X coordinate of a point
    Ypoint: indicates the Y coordinate of a point
    Color: fill Color
    Dot_Pixel: The size of the dot, providing a default of eight size points
        typedef enum {
                DOT_PIXEL_1X1  = 1,	// 1 x 1
                DOT_PIXEL_2X2  , 		// 2 X 2
                DOT_PIXEL_3X3  , 	 	// 3 X 3
                DOT_PIXEL_4X4  , 	 	// 4 X 4
                DOT_PIXEL_5X5  , 		// 5 X 5
                DOT_PIXEL_6X6  , 		// 6 X 6
                DOT_PIXEL_7X7  , 		// 7 X 7
                DOT_PIXEL_8X8  , 		// 8 X 8
        } DOT_PIXEL;
    Dot_Style: the size of a point that expands from the center of the point or from the bottom left corner of the point to the right and up
        typedef enum {
                DOT_FILL_AROUND  = 1,
                DOT_FILL_RIGHTUP,
        } DOT_STYLE;

Line drawing: In the image buffer, line from (Xstart, Ystart) to (Xend, Yend), you can choose the color, line width, and line style.

void Paint_DrawLine(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, LINE_STYLE Line_Style ,  LINE_STYLE Line_Style)
Parameters:
        Xstart: the x-starting coordinate of a line
        Ystart: indicates the Y starting point of a line
        Xend: x-terminus of a line
        Yend: the y-end coordinate of a line
        Color: fill Color
        Line_width: The width of the line, which provides a default of eight widths
                typedef enum {
                        DOT_PIXEL_1X1  = 1,	// 1 x 1
                        DOT_PIXEL_2X2  , 		// 2 X 2
                        DOT_PIXEL_3X3  ,		// 3 X 3
                        DOT_PIXEL_4X4  ,		// 4 X 4
                        DOT_PIXEL_5X5  , 		// 5 X 5
                        DOT_PIXEL_6X6  , 		// 6 X 6
                        DOT_PIXEL_7X7  , 		// 7 X 7
                        DOT_PIXEL_8X8  , 		// 8 X 8
                    } DOT_PIXEL;
        Line_Style: line style. Select whether the lines are joined in a straight or dashed way
                typedef enum {
                        LINE_STYLE_SOLID = 0,
                        LINE_STYLE_DOTTED,
                } LINE_STYLE;

Draw rectangle: In the image buffer, draw a rectangle from (Xstart, Ystart) to (Xend, Yend), you can choose the color, the width of the line, and whether to fill the inside of the rectangle.

void Paint_DrawRectangle(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, DOT_PIXEL Line_width,  DRAW_FILL Draw_Fill)
Parameters:
        Xstart: the starting X coordinate of the rectangle
        Ystart: indicates the Y starting point of the rectangle
        Xend: X terminus of the rectangle
        Yend: specifies the y-end coordinate of the rectangle
        Color: fill Color
        Line_width: The width of the four sides of a rectangle. Default eight widths are provided
        typedef enum {
                DOT_PIXEL_1X1  = 1,	// 1 x 1
                DOT_PIXEL_2X2  , 		// 2 X 2
                DOT_PIXEL_3X3  ,		// 3 X 3
                DOT_PIXEL_4X4  ,		// 4 X 4
                DOT_PIXEL_5X5  , 		// 5 X 5
                DOT_PIXEL_6X6  , 		// 6 X 6
                DOT_PIXEL_7X7  , 		// 7 X 7
                DOT_PIXEL_8X8  , 		// 8 X 8
        } DOT_PIXEL;
        Draw_Fill: Fill, whether to fill the inside of the rectangle
        typedef enum {
                DRAW_FILL_EMPTY = 0,
                DRAW_FILL_FULL,
        } DRAW_FILL;

Draw circle: In the image buffer, draw a circle of Radius with (X_Center Y_Center) as the center. You can choose the color, the width of the line, and whether to fill the inside of the circle.

void Paint_DrawCircle(UWORD X_Center, UWORD Y_Center, UWORD Radius, UWORD Color, DOT_PIXEL Line_width,  DRAW_FILL Draw_Fill)
Parameters:
        X_Center: the x-coordinate of the center of a circle
        Y_Center: Y coordinate of the center of a circle
        Radius: indicates the Radius of a circle
        Color: fill Color
        Line_width: The width of the arc, with a default of 8 widths
        typedef enum {
                DOT_PIXEL_1X1  = 1,	// 1 x 1
                DOT_PIXEL_2X2  , 		// 2 X 2
                DOT_PIXEL_3X3  ,		// 3 X 3
                DOT_PIXEL_4X4  ,		// 4 X 4
                DOT_PIXEL_5X5  , 		// 5 X 5
                DOT_PIXEL_6X6  , 		// 6 X 6
                DOT_PIXEL_7X7  , 		// 7 X 7
                DOT_PIXEL_8X8  , 		// 8 X 8
        } DOT_PIXEL;
        Draw_Fill: fill, whether to fill the inside of the circle
        typedef enum {
                DRAW_FILL_EMPTY = 0,
                DRAW_FILL_FULL,
        } DRAW_FILL;

Write Ascii character: In the image buffer, at (Xstart Ystart) as the left vertex, write an Ascii character, you can select Ascii visual character library, font foreground color, and font background color.

void Paint_DrawChar(UWORD Xstart, UWORD Ystart, const char Ascii_Char, sFONT* Font, UWORD Color_Foreground,  UWORD Color_Background)
Parameters:
        Xstart: the x-coordinate of the left vertex of a character
        Ystart: the Y coordinate of the font's left vertex
        Ascii_Char: indicates the Ascii character
        Font: Ascii visual character library, in the Fonts folder provides the following Fonts:
                Font8: 5*8 font
                Font12: 7*12 font
                Font16: 11*16 font
                Font20: 14*20 font
                Font24: 17*24 font
        Color_Foreground: Font color
        Color_Background: indicates the background color

Write English string: In the image buffer, use (Xstart Ystart) as the left vertex, write a string of English characters, can choose Ascii visual character library, font foreground color, font background color.

void Paint_DrawString_EN(UWORD Xstart, UWORD Ystart, const char * pString, sFONT* Font, UWORD Color_Foreground,  UWORD Color_Background)
Parameters:
        Xstart: the x-coordinate of the left vertex of a character
        Ystart: the Y coordinate of the font's left vertex
        PString: string, string is a pointer
        Font: Ascii visual character library, in the Fonts folder provides the following Fonts:
                Font8: 5*8 font
                Font12: 7*12 font
                Font16: 11*16 font
                Font20: 14*20 font
                Font24: 17*24 font
        Color_Foreground: Font color
        Color_Background: indicates the background color

Write Chinese string: in the image buffer, use (Xstart Ystart) as the left vertex, and write a string of Chinese characters, you can choose GB2312 encoding character font, font foreground color, and font background color.

void Paint_DrawString_CN(UWORD Xstart, UWORD Ystart, const char * pString, cFONT* font, UWORD Color_Foreground,  UWORD Color_Background)
Parameters:
        Xstart: the x-coordinate of the left vertex of a character
        Ystart: the Y coordinate of the font's left vertex
        PString: string, string is a pointer
        Font: GB2312 encoding character Font library, in the Fonts folder provides the following Fonts:
                Font12CN: ASCII font 11*21, Chinese font 16*21
                Font24CN: ASCII font24 *41, Chinese font 32*41
        Color_Foreground: Font color
        Color_Background: indicates the background color

Write numbers: In the image buffer, use (Xstart Ystart) as the left vertex, and write a string of numbers, you can choose Ascii visual character library, font foreground color, or font background color.

void Paint_DrawNum(UWORD Xpoint, UWORD Ypoint, double Nummber, sFONT* Font, UWORD Digit, UWORD Color_Foreground,   UWORD Color_Background)
Parameters:
        Xpoint: the x-coordinate of the left vertex of a character
        Ypoint: the Y coordinate of the left vertex of the font
        Nummber: indicates the number displayed, which can be a decimal
        Digit: It's a decimal number
        Font: Ascii visual character library, in the Fonts folder provides the following Fonts:
                Font8: 5*8 font
                Font12: 7*12 font
                Font16: 11*16 font
                Font20: 14*20 font
               Font24: 17*24 font
        Color_Foreground: Font color
        Color_Background: indicates the background color

Display time: in the image buffer, use (Xstart Ystart) as the left vertex, display time, you can choose Ascii visual character font, font foreground color, font background color.

void Paint_DrawTime(UWORD Xstart, UWORD Ystart, PAINT_TIME *pTime, sFONT* Font, UWORD Color_Background,  UWORD Color_Foreground)
Parameters:
        Xstart: the x-coordinate of the left vertex of a character
        Ystart: the Y coordinate of the font's left vertex
        PTime: display time, here defined as a good time structure, as long as the hour, minute, and second bits of data to the parameter;
        Font: Ascii visual character library, in the Fonts folder provides the following Fonts:
                Font8: 5*8 font
                Font12: 7*12 font
                Font16: 11*16 font
                Font20: 14*20 font
                Font24: 17*24 font
        Color_Foreground: Font color
        Color_Background: indicates the background color

User Guides of STM 32

Hardware Connection

The examples are based on STM32F103RBT6 as well as the connection table. If you want to use other MCU, you need to port the project and change the connection according to the actual hardware.

Connect to STM32F103RBT6
OLED	STM32
VCC	3.3V
GND	GND
SDA	I2C:PB9 / I2C_SOFT：PC8
SCL	I2C:PB8 / I2C_SOFT：PC6

I2C Hardware connection

Run the demo

Download the program, find the STM32 program file directory, use STM32CubeIDE to open the .cproject in the \STM32\STM32F103RBT6\ directory.
Then modify the corresponding function comment in the main.c according to the LCD model you are using, and then recompile and download to your board.

If you are using a 1.3-inch OLED Module (C), you need to comment out line 105. (Note: there cannot be multiple sentences without comment at the same time; the line number may be changed, please modify it according to the actual situation.)
The command of each OLED model can be found in the following table:

Model	Demo Function
0.49inch OLED Module	OLED_0in49_test();
0.91inch OLED Module	OLED_0in91_test();
0.95inch RGB OLED (A)/(B)	OLED_0in95_rgb_test();
0.96inch OLED (A)/(B)	OLED_0in96_test();
0.96inch OLED Module (C)/(D)/(E)	OLED_0in96_test();
0.96inch RGB OLED Module	OLED_0in96_rgb_test();
1.27inch RGB OLED Module	OLED_1in27_rgb_test();
1.3inch OLED (A)/(B)	OLED_1in3_test();
1.3inch OLED Module (C)	OLED_1in3_c_test();
1.32inch OLED Module	OLED_1in32_test();
1.5inch OLED Module	OLED_1in5_test();
1.5inch OLED Module（B）	OLED_1in5_b_test();
1.5inch RGB OLED Module	OLED_1in5_rgb_test();
1.54inch OLED Module	OLED_1in54_test();
2.42inch OLED Module	OLED_2in42_test();

Software description

The demo is developed based on the HAL library, and the software used is STM32CubeIDE. Download the demo, find the STM32 demo file directory, and open the .cproject in the STM32\STM32F103RBT6\ directory to see the demo.

In addition, you can see the file directory of the project in the STM32\STM32-F103RBT6\User\ directory. The five folders are the underlying driver, sample demo, font, GUI and OLED driver.

Demo description

Hardware interface

We package the bottom for different hardware platforms. You can check the DEV_Config.c(.h) file for more description.

Interface selection

#define USE_SPI_4W 		 1
#define USE_IIC      	         0
#define USE_IIC_SOFT		 0
Note: Modify here directly to switch SPI/I2C

Data type

#define UBYTE      uint8_t
#define UWORD      uint16_t
#define UDOUBLE    uint32_t

Module initialization and exit processing:

UBYTE	System_Init(void);
void    System_Exit(void);
Note: 
1. Here are some GPIO processing before and after using the LCD screen.
2. After the System_Exit(void) function is used, the OLED display will be turned off;

Write and read GPIO:

void 	DEV_Digital_Write(UWORD Pin, UBYTE Value);
UBYTE 	DEV_Digital_Read(UWORD Pin);

SPI writes data:

UBYTE	 SPI4W_Write_Byte(uint8_t value);

IIC writes data:

void	 I2C_Write_Byte(uint8_t value, uint8_t Cmd);

Application Function

For the screen, if you need to draw pictures, display Chinese and English characters, display pictures, etc., you can use the upper application to do, and we provide some basic functions here about some graphics processing, you can check in the directory STM32\STM32F103RB\User\GUI\GUI_Paint.c(.h).

The character font GUI dependent is in the directory STM32\STM32F103RB\User\Fonts.

Create Image Properties: Create a new image property, this property includes the image buffer name, width, height, flip angle and color.

void Paint_NewImage(UWORD Width, UWORD Height, UWORD Rotate, UWORD Color)
Parameters:
    Width: the width of the image buffer;
    Height: the height of the image buffer;
    Rotate: the rotation angle of the image;
    Color: the initial color of the image;

Set the clear screen function, usually directly call the OLED clear function:

void Paint_SetClearFuntion(void (*Clear)(UWORD));
parameter:
    Clear: Pointer to the clear screen function, used to quickly clear the screen to a certain color;

Set the drawing pixel function:

void Paint_SetDisplayFuntion(void (*Display)(UWORD,UWORD,UWORD));
parameter:
    Display: Pointer to the drawing pixel function, which is used to write data to the specified location in the internal RAM of the OLED;

Select image buffer: the purpose of the selection is that you can create multiple image attributes, there can be multiple images buffer, you can select each image you create.

void Paint_SelectImage(UBYTE *image)
Parameters:
    Image: the name of the image buffer, which is actually a pointer to the first address of the image buffer;

Image rotation: Set the selected image rotation angle, preferably after Paint_SelectImage(), you can choose to rotate 0, 90, 180 or 270 degrees.

void Paint_SetRotate(UWORD Rotate)
Parameters:
    Rotate: ROTATE_0, ROTATE_90, ROTATE_180 and ROTATE_270 correspond to 0, 90, 180 and 270 degrees respectively;

Image mirror flip: Set the mirror flip of the selected image. You can choose no mirror, horizontal mirror, vertical mirror or image center mirror.

void Paint_SetMirroring(UBYTE mirror)
Parameters:
    Mirror: indicates the image mirroring mode. MIRROR_NONE, MIRROR_HORIZONTAL, MIRROR_VERTICAL, MIRROR_ORIGIN correspond to no mirror, horizontal mirror, vertical mirror and about image center mirror respectively.

Set points of display position and color in the buffer: here is the core GUI function, processing points display position and color in the buffer.

void Paint_SetPixel(UWORD Xpoint, UWORD Ypoint, UWORD Color)
Parameters:
    Xpoint: the X position of a point in the image buffer
    Ypoint: the Y position of a point in the image buffer
    Color: the color of the point

Image buffer fill color: Fills the image buffer with a color, usually used to flash the screen into blank.

void Paint_Clear(UWORD Color)
Parameters:
    Color: fill color

The fill color of a certain window in the image buffer: the image buffer part of the window filled with a certain color, usually used to fresh the screen into blank, often used for time display, fresh the last second of the screen.

void Paint_ClearWindows(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color)
Parameters:
    Xstart: the X starting point coordinate of the window
    Ystart: the Y starting point coordinate of the window
    Xend: the x-end coordinate of the window
    Yend: the y-end coordinate of the window
    Color: fill color

Draw point: In the image buffer, draw a point on (Xpoint, Ypoint), you can choose the color, the size of the point and the style of the point.

void Paint_DrawPoint(UWORD Xpoint, UWORD Ypoint, UWORD Color, DOT_PIXEL Dot_Pixel, DOT_STYLE Dot_Style)
Parameters:
    Xpoint: indicates the X coordinate of a point
    Ypoint: indicates the Y coordinate of a point
    Color: fill color
    Dot_Pixel: The size of the dot, providing a default of eight size points
        typedef enum {
            DOT_PIXEL_1X1  ,		// 1 x 1
            DOT_PIXEL_2X2  , 		// 2 X 2
            DOT_PIXEL_3X3  , 	 	// 3 X 3
            DOT_PIXEL_4X4  , 	 	// 4 X 4
            DOT_PIXEL_5X5  , 		// 5 X 5
            DOT_PIXEL_6X6  , 		// 6 X 6
            DOT_PIXEL_7X7  , 		// 7 X 7
            DOT_PIXEL_8X8  , 		// 8 X 8
        } DOT_PIXEL;
    Dot_Style: the style of a point, which determines expands from the center of the point or from the bottom left corner of the point to the right and up
        typedef enum {
            DOT_FILL_AROUND  = 1,
            DOT_FILL_RIGHTUP,
        } DOT_STYLE;

Draw line: In the image buffer, draw a line from (Xstart, Ystart) to (Xend, Yend), you can choose the color, line width and line style.

void Paint_DrawLine(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, LINE_STYLE Line_Style ,  LINE_STYLE Line_Style)
Parameters:
    Xstart: the x-starting coordinate of the line
    Ystart: the y-starting coordinate of the line
    Xend: the x-end coordinate of the line
    Yend: the y-end coordinate of the line
    Color: fill color
    Line_width: The width of the line, the demo provides 8 sizes of width by default.
        typedef enum {
            DOT_PIXEL_1X1  ,		// 1 x 1
            DOT_PIXEL_2X2  , 		// 2 X 2
            DOT_PIXEL_3X3  ,		// 3 X 3
            DOT_PIXEL_4X4  ,		// 4 X 4
            DOT_PIXEL_5X5  , 		// 5 X 5
            DOT_PIXEL_6X6  , 		// 6 X 6
            DOT_PIXEL_7X7  , 		// 7 X 7
            DOT_PIXEL_8X8  , 		// 8 X 8
        } DOT_PIXEL;
    Line_Style: line style. Select whether the lines are joined in a straight or dashed way
        typedef enum {
            LINE_STYLE_SOLID = 0,
            LINE_STYLE_DOTTED,
        } LINE_STYLE;

Draw rectangle: In the image buffer, draw a rectangle from (Xstart, Ystart) to (Xend, Yend), you can choose the color, the width of the line and whether to fill the inside of the rectangle.

void Paint_DrawRectangle(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, DOT_PIXEL Line_width,  DRAW_FILL Draw_Fill)
Parameters:
        Xstart: the starting X coordinate of the rectangle
        Ystart: the starting Y coordinate of the rectangle
        Xend: the x-end coordinate of the rectangle
        Yend: the y-end coordinate of the rectangle
        Color: fill color
        Line_width: The width of the four sides of a rectangle. And the demo provides 8 sizes of width by default.
                DOT_PIXEL_1X1  ,		// 1 x 1
                DOT_PIXEL_2X2  , 		// 2 X 2
                DOT_PIXEL_3X3  ,		// 3 X 3
                DOT_PIXEL_4X4  ,		// 4 X 4
                DOT_PIXEL_5X5  , 		// 5 X 5
                DOT_PIXEL_6X6  , 		// 6 X 6
                DOT_PIXEL_7X7  , 		// 7 X 7
                DOT_PIXEL_8X8  , 		// 8 X 8
            } DOT_PIXEL;
        Draw_Fill: Fill, whether to fill the inside of the rectangle
            typedef enum {
                DRAW_FILL_EMPTY = 0,
                DRAW_FILL_FULL,
            } DRAW_FILL;

Draw circle: In the image buffer, draw a circle with Radius as the radius and (X_Center, Y_Center) as the center. You can choose the color, the width of the line and whether to fill the inside of the circle.

void Paint_DrawCircle(UWORD X_Center, UWORD Y_Center, UWORD Radius, UWORD Color, DOT_PIXEL Line_width,  DRAW_FILL Draw_Fill)
Parameters:
    X_Center: the x-coordinate of the center of a circle
    Y_Center: the y-coordinate of the center of the circle
    Radius: the radius of a circle
    Color: fill color
    Line_width: The width of the arc, with a default of 8 widths
        typedef enum {
            DOT_PIXEL_1X1  ,		// 1 x 1
            DOT_PIXEL_2X2  , 		// 2 X 2
            DOT_PIXEL_3X3  ,		// 3 X 3
            DOT_PIXEL_4X4  ,		// 4 X 4
            DOT_PIXEL_5X5  , 		// 5 X 5
            DOT_PIXEL_6X6  , 		// 6 X 6
            DOT_PIXEL_7X7  , 		// 7 X 7
            DOT_PIXEL_8X8  , 		// 8 X 8
        } DOT_PIXEL;
    Draw_Fill: fill, whether to fill the inside of the circle
        typedef enum {
            DRAW_FILL_EMPTY = 0,
            DRAW_FILL_FULL,
        } DRAW_FILL;

Write Ascii character: In the image buffer, use (Xstart, Ystart) as the left vertex, and write an Ascii character, you can select Ascii visual character library, font foreground color and font background color.

void Paint_DrawChar(UWORD Xstart, UWORD Ystart, const char Ascii_Char, sFONT* Font, UWORD Color_Foreground,  UWORD Color_Background)
Parameters:
    Xstart: the x-coordinate of the left vertex of a character
    Ystart: the y-coordinate of the left vertex of a character
    Ascii_Char: indicates the Ascii character
    Font: Ascii visual character library, in the Fonts folder provides the following Fonts:
        Font8: 5*8 font
        Font12: 7*12 font
        Font16: 11*16 font
        Font20: 14*20 font
        Font24: 17*24 font
    Color_Foreground: font color
    Color_Background: background color

Write English string: In the image buffer, use (Xstart, Ystart) as the left vertex, and write a string of English characters, you can choose Ascii visual character library, font foreground color and font background color.

void Paint_DrawString_EN(UWORD Xstart, UWORD Ystart, const char * pString, sFONT* Font, UWORD Color_Foreground,  UWORD Color_Background)
Parameters:
    Xstart: the X-coordinate of the left vertex of a character
    Ystart: the Y-coordinate of the left vertex of a character
    PString: string, string is a pointer
    Font: Ascii visual character library, in the Fonts folder provides the following Fonts:
        Font8: 5*8 font
        Font12: 7*12 font
        Font16: 11*16 font
        Font20: 14*20 font
        Font24: 17*24 font
     Color_Foreground: font color
     Color_Background: background color

Write Chinese string: In the image buffer, use (Xstart Ystart) as the left vertex, and write a string of Chinese characters, you can choose GB2312 encoding character font, font foreground color and font background color.

void Paint_DrawString_CN(UWORD Xstart, UWORD Ystart, const char * pString, cFONT* font, UWORD Color_Foreground,  UWORD Color_Background)
Parameters:
    Xstart: the X-coordinate of the left vertex of a character
    Ystart: the Y-coordinate of the left vertex of a character
    PString: string, string is a pointer
    Font: GB2312 encoding character Font library, in the Fonts folder provides the following Fonts:
        Font12CN: ASCII font 11*21, Chinese font 16*21
        Font24CN: ASCII font 24*41, Chinese font 32*41
    Color_Foreground: font color
    Color_Background: background color

Write numbers: In the image buffer, use (Xstart Ystart) as the left vertex, and write a string of numbers, you can choose Ascii visual character library, font foreground color and font background color.

void Paint_DrawNum(UWORD Xpoint, UWORD Ypoint, double Nummber, sFONT* Font, UWORD Digit, UWORD Color_Foreground,   UWORD Color_Background)
Parameters:
    Xstart: the X-coordinate of the left vertex of a character
    Ystart: the Y-coordinate of the left vertex of a character
    Nummber: indicates the number displayed, which can be a decimal
    Digit: It's a decimal number
    Font: Ascii visual character library, in the Fonts folder provides the following Fonts:
        Font8: 5*8 font
        Font12: 7*12 font
        Font16: 11*16 font
        Font20: 14*20 font
        Font24: 17*24 font
    Color_Foreground: font color
    Color_Background: background color

Display time: in the image buffer, use (Xstart Ystart) as the left vertex, display time, you can choose Ascii visual character font, font foreground color and font background color.

void Paint_DrawTime(UWORD Xstart, UWORD Ystart, PAINT_TIME *pTime, sFONT* Font, UWORD Color_Background,  UWORD Color_Foreground)
Parameters:
    Xstart: the X-coordinate of the left vertex of a character
    Ystart: the Y-coordinate of the left vertex of a character
    PTime: display time, here defined a time structure, just pass the hour, minute and second bits of data to the parameter;
    Font: Ascii visual character library, in the Fonts folder provides the following Fonts:
        Font8: 5*8 font
        Font12: 7*12 font
        Font16: 11*16 font
        Font20: 14*20 font
        Font24: 17*24 font
    Color_Foreground: font color
    Color_Background: background color

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