0.91inch OLED Module
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Overview
Introduction
0.91inch Module, I2C interfaces, provide Raspberry Pi, STM32, Arduino demos.
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Specification
- Display size: 0.91inch
- Operating voltage: 3.3V
- Interface: I2C
- Driver: SSD1306
- Resolution: 128 x 32
- Dimension: 36 x 12.5 (mm)
- Display color: White
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 an OLED controller with 128 x 64 pixels, but this OLED only supports 128*32 pixels, so this screen only uses the first half of the SSD1306 buffer area.
This OLED supports communication methods such as 8bit 8080 parallel, 8bit 6800 parallel, three-wire SPI, four-wire SPI, and I2C. However, the first four communication methods are not adopted, we only adopt the I2C communication as the result of the size of the module and the limited IO resources.
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 can be sent. If sending data, only one byte can be sent, or multiple bytes of data can be sent in succession, depending on the situation.
More details refer to Datasheet Page20 Figure 8-7
User Guides of RPI
Hardware connection
Please connect the LCD to your Raspberry Pi by the 7PIn cable according to the table below:
| OLED | Raspberry Pi | |
| 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
| OLED | UNO |
| VCC | 3.3V/5V |
| GND | GND |
| SDA | SDA |
| SCL | SCL |
- I2C connection
How to Install Arduino IDE
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.
| 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
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FAQ
Answer:
OLED does not have a backlight, and the display is self-illuminating. Only connect VCC and GND, the OLED will not light up. Program control is required to brighten the OLED.
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Answer:
1. Be careful not to connect the power supply in reverse.
2. The same picture cannot be displayed for a long time, otherwise, it will produce afterimages and cause damage to the OLED.
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