During 2017, BMW among other car companies, and Sony have migrated from C to C++ as their main language for embedded development.
https://archive.fosdem.org/2017/schedule/event/succes_failur...
https://www.autosar.org/
"Developing Audio Products with Cortex-M3/NuttX/C++11"
https://www.youtube.com/watch?v=T8fLjWyI5nI
Unless you consider their devices Raspberry Pi kind of platforms
Of course with companies like Microchip still focusing on Assembly and C89, C is going to stay around for a very long time
What is done in C and macros, can be safer done with C++ and constexpr templates and better optimized, problem is to change the culture of those companies.