101 lines
3.2 KiB
Rust
101 lines
3.2 KiB
Rust
//! This example shows how to communicate asynchronous using i2c with external chip.
|
|
//!
|
|
//! It's using embassy's functions directly instead of traits from embedded_hal_async::i2c::I2c.
|
|
//! While most of i2c devices are addressed using 7 bits, an extension allows 10 bits too.
|
|
|
|
#![no_std]
|
|
#![no_main]
|
|
|
|
use defmt::*;
|
|
use embassy_rp::block::ImageDef;
|
|
use embassy_rp::i2c::InterruptHandler;
|
|
use {defmt_rtt as _, panic_probe as _};
|
|
|
|
#[link_section = ".start_block"]
|
|
#[used]
|
|
pub static IMAGE_DEF: ImageDef = ImageDef::secure_exe();
|
|
|
|
// Program metadata for `picotool info`
|
|
#[link_section = ".bi_entries"]
|
|
#[used]
|
|
pub static PICOTOOL_ENTRIES: [embassy_rp::binary_info::EntryAddr; 4] = [
|
|
embassy_rp::binary_info_rp_cargo_bin_name!(),
|
|
embassy_rp::binary_info_rp_cargo_version!(),
|
|
embassy_rp::binary_info_rp_program_description!(c"Blinky"),
|
|
embassy_rp::binary_info_rp_program_build_attribute!(),
|
|
];
|
|
|
|
// Our anonymous hypotetical temperature sensor could be:
|
|
// a 12-bit sensor, with 100ms startup time, range of -40*C - 125*C, and precision 0.25*C
|
|
// It requires no configuration or calibration, works with all i2c bus speeds,
|
|
// never stretches clock or does anything complicated. Replies with one u16.
|
|
// It requires only one write to take it out of suspend mode, and stays on.
|
|
// Often result would be just on 12 bits, but here we'll simplify it to 16.
|
|
|
|
enum UncomplicatedSensorId {
|
|
A(UncomplicatedSensorU8),
|
|
B(UncomplicatedSensorU16),
|
|
}
|
|
enum UncomplicatedSensorU8 {
|
|
First = 0x48,
|
|
}
|
|
enum UncomplicatedSensorU16 {
|
|
Other = 0x0049,
|
|
}
|
|
|
|
impl Into<u16> for UncomplicatedSensorU16 {
|
|
fn into(self) -> u16 {
|
|
self as u16
|
|
}
|
|
}
|
|
impl Into<u16> for UncomplicatedSensorU8 {
|
|
fn into(self) -> u16 {
|
|
0x48
|
|
}
|
|
}
|
|
impl From<UncomplicatedSensorId> for u16 {
|
|
fn from(t: UncomplicatedSensorId) -> Self {
|
|
match t {
|
|
UncomplicatedSensorId::A(x) => x.into(),
|
|
UncomplicatedSensorId::B(x) => x.into(),
|
|
}
|
|
}
|
|
}
|
|
|
|
embassy_rp::bind_interrupts!(struct Irqs {
|
|
I2C1_IRQ => InterruptHandler<embassy_rp::peripherals::I2C1>;
|
|
});
|
|
|
|
#[embassy_executor::main]
|
|
async fn main(_task_spawner: embassy_executor::Spawner) {
|
|
let p = embassy_rp::init(Default::default());
|
|
let sda = p.PIN_14;
|
|
let scl = p.PIN_15;
|
|
let config = embassy_rp::i2c::Config::default();
|
|
let mut bus = embassy_rp::i2c::I2c::new_async(p.I2C1, scl, sda, Irqs, config);
|
|
|
|
const WAKEYWAKEY: u16 = 0xBABE;
|
|
let mut result: [u8; 2] = [0, 0];
|
|
// wait for sensors to initialize
|
|
embassy_time::Timer::after(embassy_time::Duration::from_millis(100)).await;
|
|
|
|
let _res_1 = bus
|
|
.write_async(UncomplicatedSensorU8::First, WAKEYWAKEY.to_be_bytes())
|
|
.await;
|
|
let _res_2 = bus
|
|
.write_async(UncomplicatedSensorU16::Other, WAKEYWAKEY.to_be_bytes())
|
|
.await;
|
|
|
|
loop {
|
|
let s1 = UncomplicatedSensorId::A(UncomplicatedSensorU8::First);
|
|
let s2 = UncomplicatedSensorId::B(UncomplicatedSensorU16::Other);
|
|
let sensors = [s1, s2];
|
|
for sensor in sensors {
|
|
if bus.read_async(sensor, &mut result).await.is_ok() {
|
|
info!("Result {}", u16::from_be_bytes(result.into()));
|
|
}
|
|
}
|
|
embassy_time::Timer::after(embassy_time::Duration::from_millis(200)).await;
|
|
}
|
|
}
|