I work a lot with embedded devices (arm cortex-m chips mostly), and if you download the datasheets for some chip that you think that you might be using, I would

I work a lot with embedded devices (arm cortex-m chips mostly), and if you download the datasheets for some chip that you think that you might be using, I would guess that the only code mentioned in it are going to be in assembler or C. Also, if you have a chip that you think you might be working on, check out the development tools from the chip manufacturer, it will probably be made for C. Learning to use a chip is much easier if you have a library of examples written by the chip-maker for that specific chip. For those reasons I would recomend C.