Bad clone of managarm's libarch

libarch_clone.cpp

#include <stdint.h>

constexpr uintptr_t spi1_addr = 0x40013000;

enum class spi_reg : uintptr_t {
    cr2 = 0x04
};

template <uintptr_t Base, auto Reg>
struct periph_reg_addr {
    static constexpr uintptr_t addr = Base + static_cast<uintptr_t>(Reg);
    constexpr uintptr_t operator()() { return addr; }
};

template <uintptr_t Base, auto Reg>
inline constexpr uintptr_t periph_reg_addr_v = periph_reg_addr<Base, Reg>{}();

template <typename T, uintptr_t Addr>
struct hw_register {
    volatile T *ptr = reinterpret_cast<volatile T *>(Addr);

    void store(T val) { *ptr = val; }
    T load() { return *ptr; }
};

int main () {
    hw_register<uint32_t, periph_reg_addr_v<spi1_addr, spi_reg::cr2>> reg;
    reg.store(32);
}