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： Ranging Sensor Sipeed NanoKVM Cube KVM HDMI Remote OS Control Manager Install /Power Control /Remote Desktop Server UART DeepsSeek XiaoZhi AI Voice Chat ESP32-S3 1.54 inch LCD Kit N16R8 WROOM-1-N16R8 DevKitC-1 Development Board 1.28inch Round LCD Jetson Nano Install Espressif IDF Plugin Tutorial User Guide Install Espressif IDF Plugin Tutorial User Guide Raspberry Pi LCD display screen 1.3inch ST7789 with Game Button A JLINK OB ESP32 S3 Development Board 2.8 inch B LCD 2.8inch Display 480x640 TouchScreen QMI8658 Sensor / Battery Port LVGL/HMI For Arduino Aluminum Heatsink ESP32 S3 LCD 1.3 inch Holographic Display Screen 1.3inch 3D Transparent Refractive Prism Mini TV For Arduino Raspberry Pi Pico 2 RP2350 3.5 inch LCD Capacitive 3.5inch TouchScreen Development Board 240x320 Display QMI8658 6-Axis /OV5640 Camera /SD Tuya AI Voice Robot T5-E1 1.75 inch Round AMOLED TouchScreen GPS For XiaoZhi Development Board Raspberry Pi WatchDog Raspberry Pi 5 Serial Developer Kit CSI Camera Raspberry Pi Camera OV5647 Camera (F) ESP32 IR Thermal Imaging Camera

English Character Display Principle

Raspberry Pi 14 inch Monitor TypeC/HDMI Display 14inch Screen 1920x1200 For Xbox/PS4/Switch/Jetson / Computer PC /Mobile phone

[Tutorial Navigation]