stm32f c++ baremetal
Yet another stm32f103 (Blue Pill) sandbox based on C++
This project is an experimental work for study not only stm32f103 functionality but also c++ capability on the bare metal.
On this project, I'm using arm-linux-gnueabihf cross tools installed on x86_64 debian-9 linux without linking standard libraries. Use of C++11 and above is a great advantage over C for a bare metal environment such as;
std::atomic<> operation provides an excellent spin-lock mechanism without using inline assembly language. Template based metaprogramming may choose the right algorithm and value at compile time that may reduce run time cost. Appropriate use of 'constexpr' declaration makes it clear that is placed on ROM (flash) and is determined at compile time. The binary footprint is still enough small. contractor/destructor combination will make it easy for scoped lock/unlock mechanism. A minor problem is, the class constructor for the global scoped class object does not be called due to anything to do in start-up code. As a workaround, all global scope class objects were called new operator against .bss section pre-allocated memory before the first use of the object.
- SPI -- Connect SPI1 and SPI2 by wire, and transmit data has been tested
- I2C -- Read temperature and pressure data from BMP280 has been tested
- RTC -- It seems only works on LSI clock (either HSE and LSE clock did not work so far).
- Tiny calendar calculation class 'data_time' has been implemented.
- The system_clock class has been implemented that is used together with std::chrono CAN -- Loopback test has been briefly tested without wire.