nrf: saadc do not reexport pac enums

Closes #415

embassy-nrf/src/saadc.rs

@@ -18,10 +18,10 @@ use pac::{saadc, SAADC};
 // We treat the positive and negative channels with the same enum values to keep our type tidy and given they are the same
 pub(crate) use saadc::ch::pselp::PSELP_A as InputChannel;
 
-pub use saadc::{
-    ch::config::{GAIN_A as Gain, REFSEL_A as Reference, RESP_A as Resistor, TACQ_A as Time},
-    oversample::OVERSAMPLE_A as Oversample,
-    resolution::VAL_A as Resolution,
+use saadc::{
+    ch::config::{GAIN_A, REFSEL_A, RESP_A, TACQ_A},
+    oversample::OVERSAMPLE_A,
+    resolution::VAL_A,
 };
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
@@ -161,8 +161,9 @@ impl<'d, const N: usize> Saadc<'d, N> {
 
         // Configure channels
         r.enable.write(|w| w.enable().enabled());
-        r.resolution.write(|w| w.val().variant(resolution));
-        r.oversample.write(|w| w.oversample().variant(oversample));
+        r.resolution.write(|w| w.val().variant(resolution.into()));
+        r.oversample
+            .write(|w| w.oversample().variant(oversample.into()));
 
         for (i, cc) in channel_configs.iter().enumerate() {
             r.ch[i].pselp.write(|w| w.pselp().variant(cc.p_channel));
@@ -172,15 +173,15 @@ impl<'d, const N: usize> Saadc<'d, N> {
                     .write(|w| unsafe { w.pseln().bits(n_channel as u8) });
             }
             r.ch[i].config.write(|w| {
-                w.refsel().variant(cc.reference);
-                w.gain().variant(cc.gain);
-                w.tacq().variant(cc.time);
+                w.refsel().variant(cc.reference.into());
+                w.gain().variant(cc.gain.into());
+                w.tacq().variant(cc.time.into());
                 if cc.n_channel.is_none() {
                     w.mode().se();
                 } else {
                     w.mode().diff();
                 }
-                w.resp().variant(cc.resistor);
+                w.resp().variant(cc.resistor.into());
                 w.resn().bypass();
                 if !matches!(oversample, Oversample::BYPASS) {
                     w.burst().enabled();
@@ -405,6 +406,183 @@ impl<'d, const N: usize> Drop for Saadc<'d, N> {
     }
 }
 
+impl From<Gain> for GAIN_A {
+    fn from(gain: Gain) -> Self {
+        match gain {
+            Gain::GAIN1_6 => GAIN_A::GAIN1_6,
+            Gain::GAIN1_5 => GAIN_A::GAIN1_5,
+            Gain::GAIN1_4 => GAIN_A::GAIN1_4,
+            Gain::GAIN1_3 => GAIN_A::GAIN1_3,
+            Gain::GAIN1_2 => GAIN_A::GAIN1_2,
+            Gain::GAIN1 => GAIN_A::GAIN1,
+            Gain::GAIN2 => GAIN_A::GAIN2,
+            Gain::GAIN4 => GAIN_A::GAIN4,
+        }
+    }
+}
+
+/// Gain control
+#[non_exhaustive]
+#[derive(Clone, Copy)]
+pub enum Gain {
+    /// 1/6
+    GAIN1_6 = 0,
+    /// 1/5
+    GAIN1_5 = 1,
+    /// 1/4
+    GAIN1_4 = 2,
+    /// 1/3
+    GAIN1_3 = 3,
+    /// 1/2
+    GAIN1_2 = 4,
+    /// 1
+    GAIN1 = 5,
+    /// 2
+    GAIN2 = 6,
+    /// 4
+    GAIN4 = 7,
+}
+
+impl From<Reference> for REFSEL_A {
+    fn from(reference: Reference) -> Self {
+        match reference {
+            Reference::INTERNAL => REFSEL_A::INTERNAL,
+            Reference::VDD1_4 => REFSEL_A::VDD1_4,
+        }
+    }
+}
+
+/// Reference control
+#[non_exhaustive]
+#[derive(Clone, Copy)]
+pub enum Reference {
+    /// Internal reference (0.6 V)
+    INTERNAL = 0,
+    /// VDD/4 as reference
+    VDD1_4 = 1,
+}
+
+impl From<Resistor> for RESP_A {
+    fn from(resistor: Resistor) -> Self {
+        match resistor {
+            Resistor::BYPASS => RESP_A::BYPASS,
+            Resistor::PULLDOWN => RESP_A::PULLDOWN,
+            Resistor::PULLUP => RESP_A::PULLUP,
+            Resistor::VDD1_2 => RESP_A::VDD1_2,
+        }
+    }
+}
+
+/// Positive channel resistor control
+#[non_exhaustive]
+#[derive(Clone, Copy)]
+pub enum Resistor {
+    /// Bypass resistor ladder
+    BYPASS = 0,
+    /// Pull-down to GND
+    PULLDOWN = 1,
+    /// Pull-up to VDD
+    PULLUP = 2,
+    /// Set input at VDD/2
+    VDD1_2 = 3,
+}
+
+impl From<Time> for TACQ_A {
+    fn from(time: Time) -> Self {
+        match time {
+            Time::_3US => TACQ_A::_3US,
+            Time::_5US => TACQ_A::_5US,
+            Time::_10US => TACQ_A::_10US,
+            Time::_15US => TACQ_A::_15US,
+            Time::_20US => TACQ_A::_20US,
+            Time::_40US => TACQ_A::_40US,
+        }
+    }
+}
+
+/// Acquisition time, the time the SAADC uses to sample the input voltage
+#[non_exhaustive]
+#[derive(Clone, Copy)]
+pub enum Time {
+    /// 3 us
+    _3US = 0,
+    ///  5 us
+    _5US = 1,
+    /// 10 us
+    _10US = 2,
+    /// 15 us
+    _15US = 3,
+    /// 20 us
+    _20US = 4,
+    /// 40 us
+    _40US = 5,
+}
+
+impl From<Oversample> for OVERSAMPLE_A {
+    fn from(oversample: Oversample) -> Self {
+        match oversample {
+            Oversample::BYPASS => OVERSAMPLE_A::BYPASS,
+            Oversample::OVER2X => OVERSAMPLE_A::OVER2X,
+            Oversample::OVER4X => OVERSAMPLE_A::OVER4X,
+            Oversample::OVER8X => OVERSAMPLE_A::OVER8X,
+            Oversample::OVER16X => OVERSAMPLE_A::OVER16X,
+            Oversample::OVER32X => OVERSAMPLE_A::OVER32X,
+            Oversample::OVER64X => OVERSAMPLE_A::OVER64X,
+            Oversample::OVER128X => OVERSAMPLE_A::OVER128X,
+            Oversample::OVER256X => OVERSAMPLE_A::OVER256X,
+        }
+    }
+}
+
+/// Oversample control
+#[non_exhaustive]
+#[derive(Clone, Copy)]
+pub enum Oversample {
+    /// Bypass oversampling
+    BYPASS = 0,
+    /// Oversample 2x
+    OVER2X = 1,
+    /// Oversample 4x
+    OVER4X = 2,
+    /// Oversample 8x
+    OVER8X = 3,
+    /// Oversample 16x
+    OVER16X = 4,
+    /// Oversample 32x
+    OVER32X = 5,
+    /// Oversample 64x
+    OVER64X = 6,
+    /// Oversample 128x
+    OVER128X = 7,
+    /// Oversample 256x
+    OVER256X = 8,
+}
+
+impl From<Resolution> for VAL_A {
+    fn from(resolution: Resolution) -> Self {
+        match resolution {
+            Resolution::_8BIT => VAL_A::_8BIT,
+            Resolution::_10BIT => VAL_A::_10BIT,
+            Resolution::_12BIT => VAL_A::_12BIT,
+            Resolution::_14BIT => VAL_A::_14BIT,
+        }
+    }
+}
+
+/// Set the resolution
+#[non_exhaustive]
+#[derive(Clone, Copy)]
+pub enum Resolution {
+    /// 8 bits
+    _8BIT = 0,
+    /// 10 bits
+    _10BIT = 1,
+    /// 12 bits
+    _12BIT = 2,
+    /// 14 bits
+    _14BIT = 3,
+}
+
 pub(crate) mod sealed {
     use super::*;