#include "stm32c0xx.h"
#include "stdio.h"

int pin = 12;

void GPIO_Config() {
  RCC->IOPENR |= (1<<0);
  GPIOA->MODER |= (3<<(2*pin));
}

void ADC_Config() {
  RCC->APBENR2 |= (1<<20);
  ADC1->CR &=~ (1<<0);
  while (ADC1->ISR & (1<<0))
  ADC1->CFGR1 |= (2<<3);
  ADC1->CHSELR |= (1<<pin);
  ADC1->CR |= (1<<0);
  while (!(ADC1->ISR & (1<<0)));
}

int main() {
  GPIO_Config();
  ADC_Config();

  while (1) {
    ADC1->CR |= (1<<2); 
    int adcvalue = ADC1->DR;
    printf("adcvalue %d\n", adcvalue);
    float voltage = (adcvalue / 4095.0) * 3.3;
    int voltageInt = (int)(voltage * 100);
    printf("Voltage: %d.%02dV\n", voltageInt / 100, voltageInt % 100);
  }
}