Protect the legacy example; do not make the oneshot_legacy mod an API (yet)

examples/adc.rs

@@ -6,11 +6,12 @@ use esp_idf_sys::{self as _}; // If using the `binstart` feature of `esp-idf-sys
 use std::thread;
 use std::time::Duration;
 
-use esp_idf_hal::adc::config::Config;
+#[cfg(not(feature = "adc-oneshot-new"))]
-use esp_idf_hal::adc::*;
-use esp_idf_hal::peripherals::Peripherals;
-
 fn main() -> anyhow::Result<()> {
+    use esp_idf_hal::adc::config::Config;
+    use esp_idf_hal::adc::*;
+    use esp_idf_hal::peripherals::Peripherals;
+
     let peripherals = Peripherals::take()?;
 
     #[cfg(not(esp32))]
@@ -35,3 +36,12 @@ fn main() -> anyhow::Result<()> {
         println!("ADC value: {}", adc.read(&mut adc_pin)?);
     }
 }
+
+#[cfg(feature = "adc-oneshot-new")]
+fn main() -> anyhow::Result<()> {
+    println!("This example requires feature `adc-oneshot-new` disabled");
+
+    loop {
+        thread::sleep(Duration::from_millis(1000));
+    }
+}

src/adc.rs

@@ -461,7 +461,7 @@ impl_adc!(ADC2: adc_unit_t_ADC_UNIT_2);
     not(esp_idf_version_major = "4"),
     esp_idf_comp_esp_adc_enabled
 ))]
-pub mod oneshot {
+mod oneshot {
     use core::borrow::Borrow;
 
     use esp_idf_sys::*;