NB: Just a comment, could not (yet) watch the video. Our course was very simple with 8051 compiled with IAR, IIRC. I hated the experience: quite a lot of logic

NB: Just a comment, could not (yet) watch the video. Our course was very simple with 8051 compiled with IAR, IIRC. I hated the experience: quite a lot of logic is backwards and you have to come up with something like ABI in order not to make huge mess. Anyway, this actually skyrocketed my understanding of C: C is nothing more than (rather thin, I would say) wrappers around assembly, which in turn is wrappers around machine instructions. That's why C is fast. That's why you cannot have first-class functions, return multiple (compile time unknown) values, etc.. But nothing beats spending 10+ hours debugging simple I2C (or SPI, can't remember) baremetal ARM program, first weeding out vendor libs, then actually diving into assembly only to find out that CPU is buggy.