#include "stm32c0xx.h"

int main(void)
{
    RCC->IOPENR |= (1 << 0);
    RCC->IOPENR |= (1 << 1);

    GPIOA->MODER &= ~(3 << (0 * 2));
    GPIOA->PUPDR &= ~(3 << (0 * 2));

    GPIOB->MODER &= ~(3 << (10 * 2));
    GPIOB->MODER |=  (1 << (10 * 2));
    GPIOB->OTYPER &= ~(1 << 10);
    GPIOB->OSPEEDR |=  (3 << (10 * 2));

    while (1)
    {
        if ((GPIOA->IDR & (1 << 0)) == 0) {
            if ((GPIOA->IDR & (1 << 0)) == 0)
                GPIOB->ODR |= (1 << 10); 
        } else {
            GPIOB->ODR &= ~(1 << 10);
        }
    }
}