bare-metal – Tarik Billa

What are “nosys”, “nano”, “rdimon” terms when using ARM GCC?

August 10, 2023 by Tarik

Gcc uses specs-strings, which control which subprocesses to run and what parameters it shall pass to them. The behavior defined by the spec-strings can be overridden using spec-files, whose purpose and syntax is documented here: https://gcc.gnu.org/onlinedocs/gcc/Spec-Files.html Looking at these spec files in the lib folder of the gcc tool chain (e.g. /usr/lib/arm-none-eabi/lib) we can see … Read more

How do I create a “spacer” in a C++ class memory structure?

January 17, 2023 by Tarik

How about a C++-ish way? namespace GPIO { static volatile uint32_t &MAP0_MODER = *reinterpret_cast<uint32_t*>(0x4000); static volatile uint32_t &MAP0_OTYPER = *reinterpret_cast<uint32_t*>(0x4004); } int main() { GPIO::MAP0_MODER = 42; } You get autocompletion because of the GPIO namespace, and there is no need for dummy padding. Even, it is more clear what’s going on, as you can … Read more