Make embedded-hal 0.2.7 support optional.

Cargo.toml

@@ -23,7 +23,7 @@ embedded-dma = "0.2.0"
 embedded-hal = "1.0.0"
 embedded-hal-02 = { package = "embedded-hal", version = "0.2.7", features = [
   "unproven",
-] }
+], optional = true }
 embedded-io = "0.6.1"
 gd32f1 = { version = "0.8.0", features = ["critical-section"] }
 nb = "1.1.0"

src/adc.rs

@@ -20,7 +20,6 @@ use crate::pac::{
 };
 use crate::rcu::{Clocks, Enable, Reset, APB2};
 use core::{
-    convert::Infallible,
     marker::PhantomData,
     sync::atomic::{self, Ordering},
 };
@@ -494,12 +493,13 @@ impl Adc {
     }
 }
 
+#[cfg(feature = "embedded-hal-02")]
 impl<WORD, PIN> embedded_hal_02::adc::OneShot<ADC, WORD, PIN> for Adc
 where
     WORD: From<u16>,
     PIN: Channel<ADC, ID = u8>,
 {
-    type Error = Infallible;
+    type Error = core::convert::Infallible;
 
     fn read(&mut self, pin: &mut PIN) -> nb::Result<WORD, Self::Error> {
         let res = self.read_channel(pin);

src/delay.rs

@@ -8,7 +8,6 @@ use crate::rcu::Clocks;
 use cortex_m::peripheral::syst::SystClkSource;
 use cortex_m::peripheral::SYST;
 use embedded_hal::delay::DelayNs;
-use embedded_hal_02::blocking::delay::{DelayMs, DelayUs};
 
 /// System timer (SysTick) as a delay provider
 pub struct Delay {
@@ -60,37 +59,43 @@ impl DelayNs for Delay {
     }
 }
 
-impl DelayMs<u32> for Delay {
+#[cfg(feature = "embedded-hal-02")]
+impl embedded_hal_02::delay::DelayMs<u32> for Delay {
     fn delay_ms(&mut self, ms: u32) {
         DelayNs::delay_ms(self, ms);
     }
 }
 
-impl DelayMs<u16> for Delay {
+#[cfg(feature = "embedded-hal-02")]
+impl embedded_hal_02::delay::DelayMs<u16> for Delay {
     fn delay_ms(&mut self, ms: u16) {
         DelayNs::delay_ms(self, ms.into());
     }
 }
 
-impl DelayMs<u8> for Delay {
+#[cfg(feature = "embedded-hal-02")]
+impl embedded_hal_02::delay::DelayMs<u8> for Delay {
     fn delay_ms(&mut self, ms: u8) {
         DelayNs::delay_ms(self, ms.into());
     }
 }
 
-impl DelayUs<u32> for Delay {
+#[cfg(feature = "embedded-hal-02")]
+impl embedded_hal_02::delay::DelayUs<u32> for Delay {
     fn delay_us(&mut self, us: u32) {
         DelayNs::delay_us(self, us)
     }
 }
 
-impl DelayUs<u16> for Delay {
+#[cfg(feature = "embedded-hal-02")]
+impl embedded_hal_02::delay::DelayUs<u16> for Delay {
     fn delay_us(&mut self, us: u16) {
         DelayNs::delay_us(self, us.into())
     }
 }
 
-impl DelayUs<u8> for Delay {
+#[cfg(feature = "embedded-hal-02")]
+impl embedded_hal_02::delay::DelayUs<u8> for Delay {
     fn delay_us(&mut self, us: u8) {
         DelayNs::delay_us(self, us.into())
     }

src/pwm.rs

@@ -221,6 +221,7 @@ impl<TIMER, PIN> SetDutyCycle for PwmChannel<TIMER, PIN> {
     }
 }
 
+#[cfg(feature = "embedded-hal-02")]
 impl<TIMER, PIN> embedded_hal_02::PwmPin for PwmChannel<TIMER, PIN> {
     type Duty = u16;
 
@@ -263,6 +264,7 @@ impl<TIMER, PIN> PwmChannelComplementary<TIMER, PIN> {
     }
 }
 
+#[cfg(feature = "embedded-hal-02")]
 impl<TIMER, PIN> embedded_hal_02::PwmPin for PwmChannelComplementary<TIMER, PIN> {
     type Duty = u16;
 
@@ -643,6 +645,7 @@ macro_rules! hal {
             )?
         }
 
+        #[cfg(feature = "embedded-hal-02")]
         impl<PINS> embedded_hal_02::Pwm for Pwm<$TIMERX, PINS>
         where
             PINS: Pins<$TIMERX>,