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use panic_halt as _;
use stm32f0xx_hal as hal;
use crate::hal::{i2c::I2c, pac, prelude::*};
use cortex_m_rt::entry;
/* Example meant for stm32f030xc MCUs with i2c devices connected on PB7 and PB8 */
fn main() -> ! {
if let Some(p) = pac::Peripherals::take() {
cortex_m::interrupt::free(move |cs| {
let mut flash = p.FLASH;
let mut rcc = p.RCC.configure().freeze(&mut flash);
let gpiob = p.GPIOB.split(&mut rcc);
// Configure pins for I2C
let sda = gpiob.pb7.into_alternate_af1(cs);
let scl = gpiob.pb8.into_alternate_af1(cs);
// Configure I2C with 100kHz rate
let mut i2c = I2c::i2c1(p.I2C1, (scl, sda), 100.khz(), &mut rcc);
let mut _devices = 0;
// I2C addresses are 7-bit wide, covering the 0-127 range
for add in 0..=127 {
// The write method sends the specified address and checks for acknowledgement;
// if no ack is given by the slave device the result is Err(), otherwise Ok()
// Since we only care for an acknowledgement the data sent can be empty
if i2c.write(add, &[]).is_ok() {
_devices += 1;
// Here the variable "_devices" counts how many i2c addresses were a hit
loop {