Fix doc tests for ADC module

Author: Brandon Matthews

src/adc.rs

@@ -18,21 +18,21 @@ use nb;
 /// struct Analog(()); // marker type to denote a pin in "analog" mode
 ///
 /// // GPIO 1 pin 1 can supply an ADC channel when it is configured in Analog mode
-/// impl Channel for Gpio1Pin1<Analog> {
+/// impl Channel<Adc1> for Gpio1Pin1<Analog> {
 ///     type ID = u8; // ADC channels are identified numerically
 ///
-///     const CHANNEL: u8 = 7; // GPIO pin 1 is connected to ADC channel 7
+///     fn channel() -> u8 { 7_u8 } // GPIO pin 1 is connected to ADC channel 7
 /// }
 ///
 /// struct Adc2; // ADC with two banks of 16 channels
 /// struct Gpio2PinA<MODE>(PhantomData<MODE>);
 /// struct AltFun(()); // marker type to denote some alternate function mode for the pin
 ///
 /// // GPIO 2 pin A can supply an ADC channel when it's configured in some alternate function mode
-/// impl Channel for Gpio2PinA<AltFun> {
+/// impl Channel<Adc2> for Gpio2PinA<AltFun> {
 ///     type ID = (u8, u8); // ADC channels are identified by bank number and channel number
 ///
-///     const CHANNEL: (u8, u8) = (0, 3);
+///     fn channel() -> (u8, u8) { (0, 3) } // bank 0 channel 3
 /// }
 /// ```
 #[cfg(feature = "unproven")]
@@ -72,12 +72,12 @@ pub trait Channel<ADC> {
 /// impl<WORD, PIN> OneShot<MyAdc, WORD, PIN> for MyAdc
 /// where
 ///    WORD: From<u16>,
-///    PIN: Channel<ID=u8>,
+///    PIN: Channel<MyAdc, ID=u8>,
 /// {
 ///    type Error = ();
 ///
 ///    fn read(&mut self, _pin: &mut PIN) -> nb::Result<WORD, Self::Error> {
-///        let chan = 1 << PIN::CHANNEL;
+///        let chan = 1 << PIN::channel();
 ///        self.power_up();
 ///        let result = self.do_conversion(chan);
 ///        self.power_down();