int main(int argc, char const *argv[])
{
switch_on_hse();
construct_exceptions();
construct_nvic();
construct_systick();
construct_scheduler();
construct_app();
construct_rcc();
construct_gpio();
construct_tim14();
start_exceptions();
start_nvic();
start_systick();
start_rcc();
start_gpio();
start_tim14();
start_app();
/* must be last */
start_scheduler();
}
//construct device before initializing
void construct_system(){
construct_gpio();
construct_interrupts();
construct_uart();
construct_adc();
}
