This Repository is a Keil project that contains the source code for printing with a thermal header similar to a FUJITSU FTP-628MCL103
Fonts are stored in the ROM, but if you have a hardware capability to store your fonts, you can use much more characters because you have more data space.
On this demo, you will find characters from 'A' to 'Z'.
Font characters can be created by a simple script written in visualbasic for EXCEL. You can find it on this path: Thermal_Print_Demo_Stm32f107/FontCreator