Added an example for i2c (#69)
* Added an example for i2c * added more extensive commentstrying.tmp
parent
7e345c6b4c
commit
2a61f5092d
@ -0,0 +1,56 @@
|
||||
#![no_main]
|
||||
#![no_std]
|
||||
|
||||
#[allow(unused)]
|
||||
use panic_halt;
|
||||
|
||||
use stm32f0xx_hal as hal;
|
||||
|
||||
use crate::hal::{
|
||||
prelude::*,
|
||||
i2c::I2c,
|
||||
stm32,
|
||||
};
|
||||
|
||||
use cortex_m_rt::entry;
|
||||
|
||||
/* Example meant for stm32f030xc MCUs with i2c devices connected on PB7 and PB8 */
|
||||
|
||||
#[entry]
|
||||
fn main() -> ! {
|
||||
if let Some(p) = stm32::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
|
||||
match i2c.write(add, &[]) {
|
||||
Ok(_) => {
|
||||
_devices += 1;
|
||||
},
|
||||
Err(_) => (),
|
||||
}
|
||||
}
|
||||
|
||||
// Here the variable "_devices" counts how many i2c addresses were a hit
|
||||
});
|
||||
}
|
||||
|
||||
loop {
|
||||
continue;
|
||||
}
|
||||
}
|
Loading…
Reference in New Issue