87 lines
2.1 KiB
Rust
87 lines
2.1 KiB
Rust
use Register;
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pub enum DataDirection {
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Input,
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Output,
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}
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/// An IO pin.
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pub trait Pin {
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/// The associated data direction register.
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type DDR: Register<T=u8>;
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/// The associated port register.
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type PORT: Register<T=u8>;
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/// The associated pin register.
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///
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/// Reads from the register will read input bits.
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/// Writes to the register will toggle bits.
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type PIN: Register<T=u8>;
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/// The mask of the pin used for accessing registers.
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const MASK: u8;
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/// Sets the data direction of the pin.
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#[inline(always)]
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fn set_direction(direction: DataDirection) {
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match direction {
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DataDirection::Input => Self::set_input(),
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DataDirection::Output => Self::set_output(),
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}
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}
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/// Sets the pin up as an input.
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#[inline(always)]
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fn set_input() {
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Self::DDR::unset_raw(Self::MASK);
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}
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/// Sets the pin up as an output.
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#[inline(always)]
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fn set_output() {
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Self::DDR::set_raw(Self::MASK);
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}
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/// Set the pin to high.
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///
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/// The pin must be configured as an output.
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#[inline(always)]
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fn set_high() {
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Self::PORT::set_raw(Self::MASK);
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}
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/// Set the pin to low.
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///
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/// The pin must be configured as an output.
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#[inline(always)]
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fn set_low() {
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Self::PORT::unset_raw(Self::MASK);
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}
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/// Toggles the pin.
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///
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/// The pin must be configured as an output.
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#[inline(always)]
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fn toggle() {
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// FIXME: We can optimise this on post-2006 AVRs.
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// http://www.avrfreaks.net/forum/toggle-state-output-pin
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// set(Self::PIN, Self::MASK);
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Self::PORT::toggle_raw(Self::MASK);
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}
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/// Check if the pin is currently high.
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///
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/// The pin must be configured as an input.
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#[inline(always)]
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fn is_high() -> bool {
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Self::PIN::is_set_raw(Self::MASK)
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}
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/// Checks if the pin is currently low.
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///
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/// The pin must be configured as an input.
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#[inline(always)]
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fn is_low() -> bool {
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Self::PIN::is_clear_raw(Self::MASK)
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}
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}
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