48 lines
1.3 KiB
Rust
48 lines
1.3 KiB
Rust
#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use defmt::*;
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use embassy_executor::Spawner;
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use embassy_stm32::i2c::{Error, I2c, TimeoutI2c};
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use embassy_stm32::time::Hertz;
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use embassy_stm32::{bind_interrupts, i2c, peripherals};
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use embassy_time::Duration;
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use {defmt_rtt as _, panic_probe as _};
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const ADDRESS: u8 = 0x5F;
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const WHOAMI: u8 = 0x0F;
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bind_interrupts!(struct Irqs {
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I2C2_EV => i2c::InterruptHandler<peripherals::I2C2>;
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});
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#[embassy_executor::main]
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async fn main(_spawner: Spawner) {
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info!("Hello world!");
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let p = embassy_stm32::init(Default::default());
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let mut i2c = I2c::new(
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p.I2C2,
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p.PB10,
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p.PB11,
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Irqs,
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p.DMA1_CH4,
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p.DMA1_CH5,
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Hertz(100_000),
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Default::default(),
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);
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// I2C bus can freeze if SCL line is shorted or due to a broken device that clock stretches for too long.
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// TimeoutI2c allows recovering from such errors by throwing `Error::Timeout` after a given delay.
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let mut timeout_i2c = TimeoutI2c::new(&mut i2c, Duration::from_millis(1000));
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let mut data = [0u8; 1];
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match timeout_i2c.blocking_write_read(ADDRESS, &[WHOAMI], &mut data) {
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Ok(()) => info!("Whoami: {}", data[0]),
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Err(Error::Timeout) => error!("Operation timed out"),
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Err(e) => error!("I2c Error: {:?}", e),
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}
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}
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