Create keypad handler
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351
src/keypad.rs
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351
src/keypad.rs
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@ -0,0 +1,351 @@
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#[doc(hidden)]
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pub extern crate core as _core;
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use core::cell::RefCell;
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use esp_hal::gpio::{Input, InputPin, OutputOpenDrain, OutputPin};
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/// A virtual `embedded-hal` input pin representing one key of the keypad.
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///
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/// A `KeypadInput` stores references to one row and one column pin. When you
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/// read from it with `.is_low()` or `.is_high()`, it secretly sets the column
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/// pin low, reads from the row pin, and then sets the column pin high again.
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/// The column pin is actually stored inside a `RefCell` in the keypad struct,
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/// so that multiple `KeypadInput`s can mutate the column pin's state as needed,
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/// even though they only have a shared/immutable reference to it.
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///
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/// This has several implications.
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///
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/// 1) Reading from `KeypadInput`s is not reentrant. If we were in the middle
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/// of reading a `KeypadInput` and entered an interrupt service routine that
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/// read any `KeypadInput` of the same keypad, we might read an incorrect value
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/// or cause a `panic`.
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///
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/// 2) Reading from a `KeypadInput` is slower than reading from a real input
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/// pin, because it needs to change the output pin state twice for every read.
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pub struct KeypadInput<'a> {
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row: &'a RefCell<Input<'a, InputPin>>,
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col: &'a RefCell<OutputOpenDrain<'a, dyn InputPin + OutputPin>>,
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}
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impl<'a, E> KeypadInput<'a, E> {
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/// Create a new `KeypadInput`. For use in macros.
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pub fn new(row: &'a dyn InputPin, col: &'a RefCell<dyn OutputPin>) -> Self {
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Self { row, col }
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}
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}
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impl<'a, E> InputPin for KeypadInput<'a, E> {
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type Error = E;
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/// Read the state of the key at this row and column. Not reentrant.
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fn is_high(&self) -> Result<bool, E> {
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Ok(!self.is_low()?)
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}
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/// Read the state of the key at this row and column. Not reentrant.
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fn is_low(&self) -> Result<bool, E> {
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self.col.borrow_mut().set_low()?;
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let out = self.row.is_low()?;
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self.col.borrow_mut().set_high()?;
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Ok(out)
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}
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}
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/// Define a new struct representing your keypad matrix circuit.
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///
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/// Every pin has a unique type, depending on its pin number and its current
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/// mode. This struct is where you specify which pin types will be used in the
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/// rows and columns of the keypad matrix. All the row pins must implement the
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/// `InputPin` trait, and the column pins must implement the `OutputPin` trait.
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/// The associated `Error` type of the `InputPin` and `OutputPin` traits must be
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/// the same for every row and column pin, and you must specify it after your
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/// struct name with `<Error = ...>`
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///
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/// You can specify the visibility of the struct (eg. `pub`) as usual, and add
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/// doc comments using the `#[doc="..."]` attribute.
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///
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/// Don't access or modify the struct's fields directly. Instead, use
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/// the methods implemented by this macro, documented here:
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/// [`example_generated::ExampleKeypad`](./example_generated/struct.ExampleKeypad.html)
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///
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/// # Example
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///
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/// ```
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/// # #![cfg_attr(docs_rs_workaround, feature(macro_vis_matcher))]
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/// #[macro_use]
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/// extern crate keypad;
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///
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/// use keypad::mock_hal::{self, Input, OpenDrain, Output, PullUp};
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/// use core::convert::Infallible;
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///
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/// keypad_struct! {
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/// #[doc="My super-special keypad."]
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/// pub struct ExampleKeypad<Error = Infallible> {
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/// rows: (
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/// mock_hal::gpioa::PA0<Input<PullUp>>,
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/// mock_hal::gpioa::PA1<Input<PullUp>>,
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/// mock_hal::gpioa::PA2<Input<PullUp>>,
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/// mock_hal::gpioa::PA3<Input<PullUp>>,
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/// ),
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/// columns: (
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/// mock_hal::gpioa::PA4<Output<OpenDrain>>,
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/// mock_hal::gpioa::PA5<Output<OpenDrain>>,
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/// mock_hal::gpioa::PA6<Output<OpenDrain>>,
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/// mock_hal::gpioa::PA7<Output<OpenDrain>>,
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/// mock_hal::gpioa::PA8<Output<OpenDrain>>,
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/// ),
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/// }
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/// }
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///
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/// # fn main() {
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/// # }
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/// ```
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///
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/// # Safety
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///
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/// This macro uses `unsafe` to create an array with uninitialized memory, which
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/// is then immediately initialized in a loop. This is fine as long as there is
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/// not a bug in how the macro calculates the dimensions of the array.
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// There are two reasons why this big, scary macro is necessary:
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//
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// 1) Every single pin has a unique type, and we don't know which pins will be used. We know that
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// they all implement a certain trait, but that doesn't help much because it doesn't tell us the
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// size of the type, so we can't directly stick it into the struct. If we could use dynamic
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// allocation, we could just store pins on the heap as boxed trait objects. But this crate needs
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// to work on embedded platforms without an allocator! So, we use this macro to generate a
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// struct containing the exact, concrete pin types the user provides.
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//
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// 2) We don't know how many pins there will be, because the keypad could have any number of rows
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// and columns. That makes it hard to implement `decompose()`, which needs to iterate over the
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// row and column pins. We can't store pins in arrays because they all have unique types, but we
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// can store them in tuples instead. The problem is that you can't actually iterate over a tuple,
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// and even indexing into arbitrary fields of a tuple using a macro is stupidly hard. The best
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// approach I could come up with was to repeatedly destructure the tuple with different patterns,
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// like this:
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//
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// let tuple = (0, 1, 2);
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// let array = [
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// {
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// let (ref x, ..) = tuple;
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// x
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// },
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// {
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// let (_, ref x, ..) = tuple;
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// x
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// },
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// {
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// let (_, _, ref x, ..) = tuple;
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// x
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// },
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// ];
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// for reference in array.into_iter() {
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// // ...
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// }
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//
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// So that's how the `keypad_struct!()` macro iterates over tuples of pins. It counts the length of
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// the tuple (also tricky!), creates patterns with increasing numbers of underscores, and uses them
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// to build up a temporary array of references that it can iterate over. Luckily this code only
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// needs to be run once, in `decompose()`, and not every time we read from a pin.
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//
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// I can't think of any simpler design that still has a convenient API and allows the keypad struct
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// to own the row and column pins. If they weren't owned, the crate would be less convenient to use
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// but could provide a generic Keypad struct like this:
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//
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// pub struct Keypad<'a, E, const R: usize, const C: usize> {
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// rows: [&'a dyn InputPin<Error = E>; R],
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// columns: [&'a RefCell<dyn OutputPin<Error = E>>; C],
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// }
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//
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#[macro_export]
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macro_rules! keypad_struct {
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(
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$(#[$attributes:meta])* $visibility:vis struct $struct_name:ident {
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rows: ( $($row_type:ty),* $(,)* ),
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columns: ( $($col_type:ty),* $(,)* ),
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}
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) => {
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compile_error!("You must specify the associated `Error` type of the row and column pins'\
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`InputPin` and `OutputPin` traits.\n\
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Example: `struct MyStruct <Error = Infallible> { ... }`");
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};
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(
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$(#[$attributes:meta])* $visibility:vis struct $struct_name:ident <Error = $error_type:ty> {
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rows: ( $($row_type:ty),* $(,)* ),
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columns: ( $($col_type:ty),* $(,)* ),
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}
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) => {
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$(#[$attributes])* $visibility struct $struct_name {
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/// The input pins used for reading each row.
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rows: ($($row_type),* ,),
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/// The output pins used for scanning through each column. They're
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/// wrapped in RefCells so that we can change their state even if we
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/// only have shared/immutable reference to them. This lets us
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/// actively scan the matrix when reading the state of a virtual
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/// `KeypadInput` pin.
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columns: ($($crate::_core::cell::RefCell<$col_type>),* ,),
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}
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impl $struct_name {
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/// Get a 2d array of embedded-hal input pins, each representing one
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/// key in the keypad matrix.
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#[allow(dead_code)]
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$visibility fn decompose<'a>(&'a self) ->
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keypad_struct!(
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@array2d_type
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$crate::KeypadInput<'a, $error_type>,
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($($row_type),*)
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($($crate::_core::cell::RefCell<$col_type>),*)
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)
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{
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let rows: [
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&dyn $crate::embedded_hal::digital::v2::InputPin<Error = $error_type>;
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keypad_struct!(@count $($row_type)*)
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]
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= keypad_struct!(@tuple self.rows, ($($row_type),*));
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let columns: [
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&$crate::_core::cell::RefCell<dyn $crate::embedded_hal::digital::v2::OutputPin<Error = $error_type>>;
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keypad_struct!(@count $($col_type)*)
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]
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= keypad_struct!(@tuple self.columns, ($($col_type),*));
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// Create an uninitialized 2d array of MaybeUninit.
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let mut out: keypad_struct!(
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@array2d_type
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$crate::_core::mem::MaybeUninit<$crate::KeypadInput<'a, $error_type>>,
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($($row_type),*)
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($($crate::_core::cell::RefCell<$col_type>),*)
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) = unsafe {
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$crate::_core::mem::MaybeUninit::uninit().assume_init()
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};
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// Initialize each element with a KeypadInput struct
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for r in 0..rows.len() {
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for c in 0..columns.len() {
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out[r][c].write($crate::KeypadInput::new(rows[r], columns[c]));
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}
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}
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// All elements are initialized. Transmute the array to the initialized type.
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unsafe { $crate::_core::mem::transmute::<_, _>(out) }
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}
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/// Give back ownership of the row and column pins.
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///
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/// This consumes the keypad struct. All references to its virtual
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/// `KeypadInput` pins must have gone out of scope before you try to
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/// call `.release()`, or it will fail to compile.
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///
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/// The column pins will be returned inside of `RefCell`s (because
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/// macros are hard). You can use `.into_inner()` to extract
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/// each column pin from its `RefCell`.
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#[allow(dead_code)]
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$visibility fn release(self) ->(($($row_type),* ,), ($($crate::_core::cell::RefCell<$col_type>),* ,)) {
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(self.rows, self.columns)
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}
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}
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};
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(@array2d_type $element_type:ty, ($($row:ty),*) ($($col:ty),*) ) => {
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[keypad_struct!(@array1d_type $element_type, ($($col),*)) ; keypad_struct!(@count $($row)*)]
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};
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(@array1d_type $element_type:ty, ($($col:ty),*)) => {
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[$element_type ; keypad_struct!(@count $($col)*)]
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};
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(@count $($token_trees:tt)*) => {
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0usize $(+ keypad_struct!(@replace $token_trees 1usize))*
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};
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(@replace $_t:tt $sub:expr) => {
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$sub
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};
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(@underscore $unused:tt) => {
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_
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};
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(@destructure_ref $tuple:expr, ($($repeat_n:ty),*)) => {
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{
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let (
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$(keypad_struct!(@underscore $repeat_n),)*
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ref nth, ..) = $tuple;
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nth
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}
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};
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(@tuple_helper $tuple:expr, ($head:ty), ($($result:expr),* $(,)*)) => {
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[
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keypad_struct!(@destructure_ref $tuple, ()),
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$($result),*
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]
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};
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(@tuple_helper $tuple:expr, ($head:ty $(,$repeats:ty)* $(,)*), ($($result:expr),* $(,)*)) => {
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keypad_struct!(
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@tuple_helper $tuple, ($($repeats),*),
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(
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keypad_struct!(@destructure_ref $tuple, ($($repeats),*)),
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$($result),*
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)
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)
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};
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(@tuple $tuple:expr, ($($repeats:ty),*)) => {
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keypad_struct!(@tuple_helper $tuple, ($($repeats),*) , ())
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};
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}
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/// Create an instance of the struct you defined with the `keypad_struct!()` macro..
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///
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/// The pin numbers and modes will need to match the ones you specified with `keypad_struct!()`.
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///
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/// ```
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/// # #![cfg_attr(docs_rs_workaround, feature(macro_vis_matcher))]
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/// # #[macro_use]
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/// # extern crate keypad;
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/// # use core::convert::Infallible;
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/// # use keypad::mock_hal::{self, Input, OpenDrain, Output, PullUp};
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/// # use keypad::mock_hal::{GpioExt, GPIOA};
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/// # keypad_struct!{
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/// # pub struct ExampleKeypad<Error = Infallible>{
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/// # rows: (
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/// # mock_hal::gpioa::PA0<Input<PullUp>>,
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/// # mock_hal::gpioa::PA1<Input<PullUp>>,
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/// # mock_hal::gpioa::PA2<Input<PullUp>>,
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/// # mock_hal::gpioa::PA3<Input<PullUp>>,
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/// # ),
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/// # columns: (
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/// # mock_hal::gpioa::PA4<Output<OpenDrain>>,
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/// # mock_hal::gpioa::PA5<Output<OpenDrain>>,
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/// # mock_hal::gpioa::PA6<Output<OpenDrain>>,
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/// # mock_hal::gpioa::PA7<Output<OpenDrain>>,
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/// # mock_hal::gpioa::PA8<Output<OpenDrain>>,
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/// # ),
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/// # }
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/// # }
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/// # fn main() {
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/// let pins = GPIOA::split();
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///
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/// let keypad = keypad_new!(ExampleKeypad {
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/// rows: (
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/// pins.pa0.into_pull_up_input(),
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/// pins.pa1.into_pull_up_input(),
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/// pins.pa2.into_pull_up_input(),
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/// pins.pa3.into_pull_up_input(),
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/// ),
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/// columns: (
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/// pins.pa4.into_open_drain_output(),
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/// pins.pa5.into_open_drain_output(),
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/// pins.pa6.into_open_drain_output(),
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/// pins.pa7.into_open_drain_output(),
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/// pins.pa8.into_open_drain_output(),
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/// ),
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/// });
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/// # }
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/// ```
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#[macro_export]
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macro_rules! keypad_new {
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( $struct_name:ident {
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rows: ( $($row_val:expr),* $(,)* ),
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columns: ( $($col_val:expr),* $(,)* ),
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}) => {
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$struct_name {
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rows: ($($row_val),* ,),
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columns: ($($crate::_core::cell::RefCell::new($col_val)),* ,),
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}
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};
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}
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170
src/main.rs
170
src/main.rs
@ -115,20 +115,37 @@ fn main() -> ! {
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// .unwrap();
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driver.clear_frame(&mut spi, &mut delay).unwrap();
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let mut kbd = Keyboard {
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rows: Rows {
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gpio2: Input::new(io.pins.gpio2, Pull::Up),
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gpio3: Input::new(io.pins.gpio3, Pull::Up),
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gpio4: Input::new(io.pins.gpio4, Pull::Up),
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gpio5: Input::new(io.pins.gpio5, Pull::Up),
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},
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cols: Cols {
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gpio6: Output::new(io.pins.gpio6, Level::Low),
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gpio7: Output::new(io.pins.gpio7, Level::Low),
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gpio8: Output::new(io.pins.gpio8, Level::Low),
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gpio10: Output::new(io.pins.gpio10, Level::Low),
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},
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};
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let mut gpio2 = Input::new(io.pins.gpio2, Pull::Up);
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let mut gpio3 = Input::new(io.pins.gpio3, Pull::Up);
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let mut gpio4 = Input::new(io.pins.gpio4, Pull::Up);
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let mut gpio5 = Input::new(io.pins.gpio5, Pull::Up);
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let mut gpio6 = OutputOpenDrain::new(io.pins.gpio6, Level::Low, Pull::Up);
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let mut gpio7 = OutputOpenDrain::new(io.pins.gpio7, Level::Low, Pull::Up);
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let mut gpio8 = OutputOpenDrain::new(io.pins.gpio8, Level::Low, Pull::Up);
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let mut gpio10 = OutputOpenDrain::new(io.pins.gpio10, Level::Low, Pull::Up);
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let mut kbd = Keypad((
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(&mut gpio2, &mut gpio6),
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(&mut gpio3, &mut gpio6),
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(&mut gpio4, &mut gpio6),
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(&mut gpio5, &mut gpio6),
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// --------------------------------------
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(&mut gpio2, &mut gpio7),
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(&mut gpio3, &mut gpio7),
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(&mut gpio4, &mut gpio7),
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(&mut gpio5, &mut gpio7),
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// --------------------------------------
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(&mut gpio2, &mut gpio8),
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(&mut gpio3, &mut gpio8),
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(&mut gpio4, &mut gpio8),
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(&mut gpio5, &mut gpio8),
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// --------------------------------------
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(&mut gpio2, &mut gpio10),
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(&mut gpio3, &mut gpio10),
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(&mut gpio4, &mut gpio10),
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(&mut gpio5, &mut gpio10),
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));
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let mut ctx = Context {
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button_pressed: None,
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@ -218,79 +235,78 @@ struct Rows<'d> {
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gpio5: Input<'d, Gpio5>, //
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}
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struct Cols<'d> {
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gpio6: Output<'d, Gpio6>, //
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gpio7: Output<'d, Gpio7>, //
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gpio8: Output<'d, Gpio8>, //
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gpio10: Output<'d, Gpio10>, //
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gpio6: OutputOpenDrain<'d, Gpio6>, //
|
||||
gpio7: OutputOpenDrain<'d, Gpio7>, //
|
||||
gpio8: OutputOpenDrain<'d, Gpio8>, //
|
||||
gpio10: OutputOpenDrain<'d, Gpio10>, //
|
||||
}
|
||||
struct Keyboard<'d> {
|
||||
rows: Rows<'d>,
|
||||
cols: Cols<'d>,
|
||||
}
|
||||
impl<'d> Keyboard<'d> {
|
||||
pub type OOD<'d, T> = OutputOpenDrain<'d, T>;
|
||||
|
||||
struct Keypad<'d>(
|
||||
pub (
|
||||
// --------------------------------------
|
||||
(&'d mut Input<'d, Gpio2>, &'d mut OOD<'d, Gpio6>),
|
||||
(&'d mut Input<'d, Gpio3>, &'d mut OOD<'d, Gpio6>),
|
||||
(&'d mut Input<'d, Gpio4>, &'d mut OOD<'d, Gpio6>),
|
||||
(&'d mut Input<'d, Gpio5>, &'d mut OOD<'d, Gpio6>),
|
||||
// --------------------------------------
|
||||
(&'d mut Input<'d, Gpio2>, &'d mut OOD<'d, Gpio7>),
|
||||
(&'d mut Input<'d, Gpio3>, &'d mut OOD<'d, Gpio7>),
|
||||
(&'d mut Input<'d, Gpio4>, &'d mut OOD<'d, Gpio7>),
|
||||
(&'d mut Input<'d, Gpio5>, &'d mut OOD<'d, Gpio7>),
|
||||
// --------------------------------------
|
||||
(&'d mut Input<'d, Gpio2>, &'d mut OOD<'d, Gpio8>),
|
||||
(&'d mut Input<'d, Gpio3>, &'d mut OOD<'d, Gpio8>),
|
||||
(&'d mut Input<'d, Gpio4>, &'d mut OOD<'d, Gpio8>),
|
||||
(&'d mut Input<'d, Gpio5>, &'d mut OOD<'d, Gpio8>),
|
||||
// --------------------------------------
|
||||
(&'d mut Input<'d, Gpio2>, &'d mut OOD<'d, Gpio10>),
|
||||
(&'d mut Input<'d, Gpio3>, &'d mut OOD<'d, Gpio10>),
|
||||
(&'d mut Input<'d, Gpio4>, &'d mut OOD<'d, Gpio10>),
|
||||
(&'d mut Input<'d, Gpio5>, &'d mut OOD<'d, Gpio10>),
|
||||
),
|
||||
);
|
||||
impl<'d> Keypad<'d> {
|
||||
pub fn pressed(&mut self) -> Option<Button> {
|
||||
self.cols.gpio6.set_high();
|
||||
let col1 = [
|
||||
self.rows.gpio2.is_high(),
|
||||
self.rows.gpio3.is_high(),
|
||||
self.rows.gpio4.is_high(),
|
||||
self.rows.gpio5.is_high(),
|
||||
self.0 .0.is_low(),
|
||||
self.0 .1.is_low(),
|
||||
self.0 .2.is_low(),
|
||||
self.0 .3.is_low(),
|
||||
];
|
||||
self.cols.gpio6.set_high();
|
||||
|
||||
self.cols.gpio7.set_high();
|
||||
let col2 = [
|
||||
self.rows.gpio2.is_high(),
|
||||
self.rows.gpio3.is_high(),
|
||||
self.rows.gpio4.is_high(),
|
||||
self.rows.gpio5.is_high(),
|
||||
self.0 .4.is_low(),
|
||||
self.0 .5.is_low(),
|
||||
self.0 .6.is_low(),
|
||||
self.0 .7.is_low(),
|
||||
];
|
||||
self.cols.gpio7.set_low();
|
||||
|
||||
self.cols.gpio8.set_high();
|
||||
let col3 = [
|
||||
self.rows.gpio2.is_high(),
|
||||
self.rows.gpio3.is_high(),
|
||||
self.rows.gpio4.is_high(),
|
||||
self.rows.gpio5.is_high(),
|
||||
self.0 .8.is_low(),
|
||||
self.0 .9.is_low(),
|
||||
self.0 .10.is_low(),
|
||||
self.0 .11.is_low(),
|
||||
];
|
||||
self.cols.gpio8.set_low();
|
||||
|
||||
self.cols.gpio10.set_high();
|
||||
let col4 = [
|
||||
self.rows.gpio2.is_high(),
|
||||
self.rows.gpio3.is_high(),
|
||||
self.rows.gpio4.is_high(),
|
||||
self.rows.gpio5.is_high(),
|
||||
self.0 .12.is_low(),
|
||||
self.0 .13.is_low(),
|
||||
self.0 .14.is_low(),
|
||||
self.0 .15.is_low(),
|
||||
];
|
||||
self.cols.gpio10.set_low();
|
||||
println!("***************************************");
|
||||
println!("col1 {col1:?}");
|
||||
println!("col2 {col2:?}");
|
||||
println!("col3 {col3:?}");
|
||||
println!("col4 {col4:?}");
|
||||
|
||||
if col1.iter().any(|b| !b)
|
||||
|| col2.iter().any(|b| !b)
|
||||
|| col3.iter().any(|b| !b)
|
||||
|| col4.iter().any(|b| !b)
|
||||
{
|
||||
println!("***************************************");
|
||||
println!("col1 {col1:?}");
|
||||
println!("col2 {col2:?}");
|
||||
println!("col3 {col3:?}");
|
||||
println!("col4 {col4:?}");
|
||||
}
|
||||
None
|
||||
}
|
||||
}
|
||||
/*
|
||||
struct Keyboard<'d>(
|
||||
[(
|
||||
core::cell::RefCell<dyn InputPin + 'd>,
|
||||
core::cell::RefCell<dyn OutputPin + 'd>,
|
||||
); 16],
|
||||
);
|
||||
|
||||
impl<'d> Keyboard<'d> {
|
||||
pub fn new(cols: [impl InputPin; 4], rows: [impl OutputPin; 4]) {
|
||||
core::array::from_fn(|x| )
|
||||
for (x, c) in cols.into_iter().enumerate() {
|
||||
for (y, r) in rows.into_iter().enumerate() {
|
||||
;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
trait KeyboardInput<'d> {
|
||||
fn is_low(&mut self) -> bool;
|
||||
@ -299,11 +315,13 @@ trait KeyboardInput<'d> {
|
||||
}
|
||||
}
|
||||
|
||||
impl<'d, C: InputPin, R: OutputPin> KeyboardInput<'d> for (Input<'d, C>, Output<'d, R>) {
|
||||
impl<'d, C: InputPin, R: OutputPin + InputPin> KeyboardInput<'d>
|
||||
for (&'d mut Input<'d, C>, &'d mut OutputOpenDrain<'d, R>)
|
||||
{
|
||||
fn is_low(&mut self) -> bool {
|
||||
self.1.set_low();
|
||||
let s = self.0.is_low();
|
||||
self.1.set_high();
|
||||
s
|
||||
}
|
||||
}*/
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user