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： Camera Raspberry-Pi-Game-1.54inch-LCD-touchscreen-display-ST7789 Servo Raspberry Pi Prism RM520N GL 5G/4G/3G M.2 Moudle IoT EMBB For LTE-A/NSA/SA And GNSS For DFOTA /VoLTE For Quectel Milk-V Duo TTL UART To CAN Mini CAM-GC2083 4.26inch Template: Pico-get-start JETSON-NANO-MINI HDMI to TTL ESP32 0.85inch LCD LuckFox Jetson RTL8822CE 5GHz WiFi Wireless Bluetooth5 Card NGFF-M.2 RTL8822CE-CG Core Mechanical Keyboard X1201 Raspberry Pi 5 UPS Board Uninterruptible Power Supply For 18650-Li-Battery (NOT includ) Raspberry Pi 12.3 inch HDMI LCD Captive TouchScreen Display 1920x720 For Jetson Series/Computer PC ESP32 S3 Development Board 2.41 inch AMOLED Display 600x450 TouchScreen For Arduino LVGL With SD-Port/ QMI8658C 6-Axis Sensor Jetson Orin Nano UGV Beast PT ROS2 AI OpenCV Robot Car MediaPipe

English Character Display Principle

Raspberry Pi 7inch DSI LCD Display MIPI IPS 800x480 Capacitive TouchScreen

[Tutorial Navigation]