embassy/embassy-stm32/src/i2c/mod.rs

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#![macro_use]
use embassy::interrupt::Interrupt;
#[cfg_attr(i2c_v1, path = "v1.rs")]
#[cfg_attr(i2c_v2, path = "v2.rs")]
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mod _version;
use crate::{dma, peripherals};
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pub use _version::*;
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
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pub enum Error {
Bus,
Arbitration,
Nack,
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Timeout,
Crc,
Overrun,
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ZeroLengthTransfer,
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}
pub(crate) mod sealed {
use super::dma;
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use crate::gpio::Pin;
use crate::rcc::RccPeripheral;
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pub trait Instance: RccPeripheral {
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fn regs() -> crate::pac::i2c::I2c;
fn state_number() -> usize;
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}
pub trait SclPin<T: Instance>: Pin {
fn af_num(&self) -> u8;
}
pub trait SdaPin<T: Instance>: Pin {
fn af_num(&self) -> u8;
}
pub trait RxDma<T: Instance> {
fn request(&self) -> dma::Request;
}
pub trait TxDma<T: Instance> {
fn request(&self) -> dma::Request;
}
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}
pub trait Instance: sealed::Instance + 'static {
type Interrupt: Interrupt;
}
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pub trait SclPin<T: Instance>: sealed::SclPin<T> + 'static {}
pub trait SdaPin<T: Instance>: sealed::SdaPin<T> + 'static {}
pub trait RxDma<T: Instance>: sealed::RxDma<T> + dma::Channel {}
pub trait TxDma<T: Instance>: sealed::TxDma<T> + dma::Channel {}
macro_rules! i2c_state {
(I2C1) => {
0
};
(I2C2) => {
1
};
(I2C3) => {
2
};
(I2C4) => {
3
};
(I2C5) => {
4
};
}
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crate::pac::interrupts!(
($inst:ident, i2c, $block:ident, EV, $irq:ident) => {
impl sealed::Instance for peripherals::$inst {
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fn regs() -> crate::pac::i2c::I2c {
crate::pac::$inst
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}
fn state_number() -> usize {
i2c_state!($inst)
}
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}
impl Instance for peripherals::$inst {
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type Interrupt = crate::interrupt::$irq;
}
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};
);
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macro_rules! impl_pin {
($inst:ident, $pin:ident, $signal:ident, $af:expr) => {
impl $signal<peripherals::$inst> for peripherals::$pin {}
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impl sealed::$signal<peripherals::$inst> for peripherals::$pin {
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fn af_num(&self) -> u8 {
$af
}
}
};
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}
#[cfg(not(rcc_f1))]
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crate::pac::peripheral_pins!(
($inst:ident, i2c, I2C, $pin:ident, SDA, $af:expr) => {
impl_pin!($inst, $pin, SdaPin, $af);
};
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($inst:ident, i2c, I2C, $pin:ident, SCL, $af:expr) => {
impl_pin!($inst, $pin, SclPin, $af);
};
);
#[cfg(rcc_f1)]
crate::pac::peripheral_pins!(
($inst:ident, i2c, I2C, $pin:ident, SDA) => {
impl_pin!($inst, $pin, SdaPin, 0);
};
($inst:ident, i2c, I2C, $pin:ident, SCL) => {
impl_pin!($inst, $pin, SclPin, 0);
};
);
#[allow(unused)]
macro_rules! impl_dma {
($inst:ident, {dmamux: $dmamux:ident}, $signal:ident, $request:expr) => {
impl<T> sealed::$signal<peripherals::$inst> for T
where
T: crate::dma::MuxChannel<Mux = crate::dma::$dmamux>,
{
fn request(&self) -> dma::Request {
$request
}
}
impl<T> $signal<peripherals::$inst> for T where
T: crate::dma::MuxChannel<Mux = crate::dma::$dmamux>
{
}
};
($inst:ident, {channel: $channel:ident}, $signal:ident, $request:expr) => {
impl sealed::$signal<peripherals::$inst> for peripherals::$channel {
fn request(&self) -> dma::Request {
$request
}
}
impl $signal<peripherals::$inst> for peripherals::$channel {}
};
}
crate::pac::peripheral_dma_channels! {
($peri:ident, i2c, $kind:ident, RX, $channel:tt, $request:expr) => {
impl_dma!($peri, $channel, RxDma, $request);
};
($peri:ident, i2c, $kind:ident, TX, $channel:tt, $request:expr) => {
impl_dma!($peri, $channel, TxDma, $request);
};
}