Implement I2C pullup configuration

embassy-stm32/src/gpio.rs

@@ -213,7 +213,7 @@ impl<'d, T: Pin> Drop for Flex<'d, T> {
 }
 
 /// Pull setting for an input.
-#[derive(Debug, Eq, PartialEq)]
+#[derive(Debug, Eq, PartialEq, Copy, Clone)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Pull {
     None,
@@ -235,7 +235,7 @@ impl From<Pull> for vals::Pupdr {
 }
 
 /// Speed settings
-#[derive(Debug)]
+#[derive(Debug, Copy, Clone)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Speed {
     Low,
@@ -303,7 +303,7 @@ impl<'d, T: Pin> Input<'d, T> {
 }
 
 /// Digital input or output level.
-#[derive(Debug, Eq, PartialEq)]
+#[derive(Debug, Eq, PartialEq, Copy, Clone)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Level {
     Low,
@@ -470,7 +470,7 @@ pub(crate) mod sealed {
     use super::*;
 
     /// Alternate function type settings
-    #[derive(Debug)]
+    #[derive(Debug, Copy, Clone)]
     #[cfg_attr(feature = "defmt", derive(defmt::Format))]
     pub enum AFType {
         Input,

embassy-stm32/src/i2c/v1.rs

@@ -4,11 +4,24 @@ use embassy_embedded_hal::SetConfig;
 use embassy_hal_common::into_ref;
 
 use crate::gpio::sealed::AFType;
+use crate::gpio::Pull;
 use crate::i2c::{Error, Instance, SclPin, SdaPin};
 use crate::pac::i2c;
 use crate::time::Hertz;
 use crate::Peripheral;
 
+#[non_exhaustive]
+#[derive(Copy, Clone)]
+pub struct Config {
+    pullup_enable: bool,
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self { pullup_enable: true }
+    }
+}
+
 pub struct State {}
 
 impl State {
@@ -27,15 +40,21 @@ impl<'d, T: Instance> I2c<'d, T> {
         scl: impl Peripheral<P = impl SclPin<T>> + 'd,
         sda: impl Peripheral<P = impl SdaPin<T>> + 'd,
         freq: Hertz,
+        config: Config,
     ) -> Self {
         into_ref!(scl, sda);
 
         T::enable();
         T::reset();
 
+        let pull = match config.pullup_enable {
+            true => Pull::Up,
+            false => Pull::None,
+        };
+
         unsafe {
-            scl.set_as_af(scl.af_num(), AFType::OutputOpenDrain);
+            scl.set_as_af_pull(scl.af_num(), AFType::OutputOpenDrain, pull);
-            sda.set_as_af(sda.af_num(), AFType::OutputOpenDrain);
+            sda.set_as_af_pull(sda.af_num(), AFType::OutputOpenDrain, pull);
         }
 
         unsafe {

embassy-stm32/src/i2c/v2.rs

@@ -10,12 +10,25 @@ use futures::future::poll_fn;
 
 use crate::dma::NoDma;
 use crate::gpio::sealed::AFType;
+use crate::gpio::Pull;
 use crate::i2c::{Error, Instance, SclPin, SdaPin};
 use crate::interrupt::InterruptExt;
 use crate::pac::i2c;
 use crate::time::Hertz;
 use crate::Peripheral;
 
+#[non_exhaustive]
+#[derive(Copy, Clone)]
+pub struct Config {
+    pullup_enable: bool,
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self { pullup_enable: true }
+    }
+}
+
 pub struct State {
     waker: AtomicWaker,
     chunks_transferred: AtomicUsize,
@@ -46,15 +59,21 @@ impl<'d, T: Instance, TXDMA, RXDMA> I2c<'d, T, TXDMA, RXDMA> {
         tx_dma: impl Peripheral<P = TXDMA> + 'd,
         rx_dma: impl Peripheral<P = RXDMA> + 'd,
         freq: Hertz,
+        config: Config,
     ) -> Self {
         into_ref!(peri, irq, scl, sda, tx_dma, rx_dma);
 
         T::enable();
         T::reset();
 
+        let pull = match config.pullup_enable {
+            true => Pull::Up,
+            false => Pull::None,
+        };
+
         unsafe {
-            scl.set_as_af(scl.af_num(), AFType::OutputOpenDrain);
+            scl.set_as_af_pull(scl.af_num(), AFType::OutputOpenDrain, pull);
-            sda.set_as_af(sda.af_num(), AFType::OutputOpenDrain);
+            sda.set_as_af_pull(sda.af_num(), AFType::OutputOpenDrain, pull);
         }
 
         unsafe {

examples/stm32h7/src/bin/camera.rs

@@ -39,7 +39,16 @@ async fn main(_spawner: Spawner, p: Peripherals) {
 
     let mut led = Output::new(p.PE3, Level::High, Speed::Low);
     let i2c_irq = interrupt::take!(I2C1_EV);
-    let cam_i2c = I2c::new(p.I2C1, p.PB8, p.PB9, i2c_irq, p.DMA1_CH1, p.DMA1_CH2, khz(100));
+    let cam_i2c = I2c::new(
+        p.I2C1,
+        p.PB8,
+        p.PB9,
+        i2c_irq,
+        p.DMA1_CH1,
+        p.DMA1_CH2,
+        khz(100),
+        Default::default(),
+    );
 
     let mut camera = Ov7725::new(cam_i2c, mco);
 

examples/stm32l4/src/bin/i2c.rs

@@ -16,7 +16,16 @@ const WHOAMI: u8 = 0x0F;
 #[embassy_executor::main]
 async fn main(_spawner: Spawner, p: Peripherals) -> ! {
     let irq = interrupt::take!(I2C2_EV);
-    let mut i2c = I2c::new(p.I2C2, p.PB10, p.PB11, irq, NoDma, NoDma, Hertz(100_000));
+    let mut i2c = I2c::new(
+        p.I2C2,
+        p.PB10,
+        p.PB11,
+        irq,
+        NoDma,
+        NoDma,
+        Hertz(100_000),
+        Default::default(),
+    );
 
     let mut data = [0u8; 1];
     unwrap!(i2c.blocking_write_read(ADDRESS, &[WHOAMI], &mut data));

examples/stm32l4/src/bin/i2c_blocking_async.rs

@@ -18,7 +18,16 @@ const WHOAMI: u8 = 0x0F;
 #[embassy_executor::main]
 async fn main(_spawner: Spawner, p: Peripherals) -> ! {
     let irq = interrupt::take!(I2C2_EV);
-    let i2c = I2c::new(p.I2C2, p.PB10, p.PB11, irq, NoDma, NoDma, Hertz(100_000));
+    let i2c = I2c::new(
+        p.I2C2,
+        p.PB10,
+        p.PB11,
+        irq,
+        NoDma,
+        NoDma,
+        Hertz(100_000),
+        Default::default(),
+    );
     let mut i2c = BlockingAsync::new(i2c);
 
     let mut data = [0u8; 1];

examples/stm32l4/src/bin/i2c_dma.rs

@@ -15,7 +15,16 @@ const WHOAMI: u8 = 0x0F;
 #[embassy_executor::main]
 async fn main(_spawner: Spawner, p: Peripherals) -> ! {
     let irq = interrupt::take!(I2C2_EV);
-    let mut i2c = I2c::new(p.I2C2, p.PB10, p.PB11, irq, p.DMA1_CH4, p.DMA1_CH5, Hertz(100_000));
+    let mut i2c = I2c::new(
+        p.I2C2,
+        p.PB10,
+        p.PB11,
+        irq,
+        p.DMA1_CH4,
+        p.DMA1_CH5,
+        Hertz(100_000),
+        Default::default(),
+    );
 
     let mut data = [0u8; 1];
     unwrap!(i2c.write_read(ADDRESS, &[WHOAMI], &mut data).await);