Средства и методы разработки

// The LED program.
#include <cstdint>
#include "mcal_reg.h"

class led {

public:
        typedef std::uint8_t port_type;
        typedef std::uint8_t bval_type;

led(const port_type p, const bval_type b) : port(p), bval(b) {

       *reinterpret_cast<volatile bval_type*>(port) &= static_cast<bval_type>(~bval);
       const port_type pdir = port - 1U;
       *reinterpret_cast<volatile bval_type*>(pdir) |= bval;
}

void toggle() const { 

       *reinterpret_cast<volatile bval_type*>(port) ^= bval;
}

private:

       const port_type port;
       const bval_type bval;
};

namespace{ 

       const led led_b5 { mcal::reg::portb, mcal::reg::bval5 };
}

int main(){

        for(;;){

             led_b5.toggle();
       }
}