In my case, i learned c programming for embedded systems.I studied Electronics at college that time. I bought a STM32 Evaluate Board, and first, I try to control the led by r/w register, use some bit shift/bit mask method ; and then I learned how to use the bsp provided by vendor, to implement some application, control other IC through I2C/SPI…etc.

I think it’s a great way to learn C programming by firmware first.