English Character Display Principle

let's learn how ASCII codes are displayed. The following takes the STM32 program of the 2.13-inch e-Paper HAT as an example to explain. To display characters, you must need fonts first. The files of the Fonts directory in the sample program correspond to different fonts. Open the file and you can see a bunch of data.

Each font has a structure that stores information about the font respectively. The structure includes an array pointer, font width, and font height.

The above fonts are copied from the stm32 official sample program. It is an ASCII character. Now let's explain how we make the font. The picture below is the font modulo of the "A" of Font8, we can use the font modulo software to get the data of the A character.

Related software Zimo221

The font data can be got from the font modulo software which extracts the modulo of the font horizontally and vertically and displays each pixel with an array. For instance, if you want to display the "A" character, you can find the data of the "A" character and then display the font modulo point by point.

One thing to note here is the red box, the font array is stored in ASCII order, the first character is a space " ", and the data size of each character is the same. So subtract the ASCII code of the space bar from the ASCII code of A to find the starting position of the data for the character "A".

String display is to display each character.

TAG： LuckFox Raspberry Pi 12.3 inch HDMI LCD Captive TouchScreen Display 1920x720 For Jetson Series/Computer PC Jetson Nano Fan Raspberry Pi 5 LuckFox Pico UART UART ESP32 S3 Development Board 1.91 inch AMOLED Display Screen For Arduino LVGL With SD-Port/ QMI8658C 6-Axis Sensor Jetson 1.5inch LCD Raspberry Pi IR Ther Sipeed Lichee Tang Nano 9K FPGA MINI Development Board GW1NR-9 GOAI Gowin Raspberry Pi 5 PCIe USB HUB 3.2 Gen1 HAT+ High Speed Pi5 Core3566002032 Raspberry Pi LCD 3D Display Modbus RTU Luckfox Pico LCD AI Machine Vision Kit OAK-D-POE JPEG Encoder 12MP IP67 Waterproof 4TOPS OpenCV Camera MPTPU Raspberry Pi 5 TPU AI Kit 2TOPS PCIe to TPU HAT Pi5 For Google Coral Edge TPU Development Board Programmable Magnetic Encoder Raspberry Pi 5 Box Case Ki-A PCIe to RJ45 Gigabit Ethernet All Ports To Pi's USB Side

English Character Display Principle

MG90S Servo Micro Metal Gear High Torque 2/2.8kg Rotate 180Angle

[Tutorial Navigation]