67 lines
1.5 KiB
Rust
67 lines
1.5 KiB
Rust
use embedded_hal::digital::v2::{InputPin, OutputPin};
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use rppal::gpio::{IoPin, Mode};
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use void;
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/**
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* Raspberry pi does not have open drain pins so we have to emulate it.
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*/
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pub struct OpenPin {
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iopin: IoPin,
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mode: Mode,
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}
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impl OpenPin {
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pub fn new(mut pin: IoPin) -> OpenPin {
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pin.set_mode(Mode::Input);
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OpenPin {
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iopin: pin,
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mode: Mode::Input,
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}
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}
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pub fn switch_input(&mut self) {
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if self.mode != Mode::Input {
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self.mode = Mode::Input;
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self.iopin.set_mode(Mode::Input);
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}
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}
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pub fn switch_output(&mut self) {
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if self.mode != Mode::Output {
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self.mode = Mode::Output;
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self.iopin.set_mode(Mode::Output);
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}
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}
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}
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// Current rppal implementation does not support embedded_hal::gpio::v2 pins API.
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impl InputPin for OpenPin {
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type Error = void::Void;
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fn is_high(&self) -> Result<bool, Self::Error> {
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Ok(self.iopin.is_high())
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}
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/// Is the input pin low?
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fn is_low(&self) -> Result<bool, Self::Error> {
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Ok(self.iopin.is_low())
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}
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}
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// Current rppal implementation does not support embedded_hal::gpio::v2 pins API.
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impl OutputPin for OpenPin {
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type Error = void::Void;
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fn set_low(&mut self) -> Result<(), Self::Error> {
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self.switch_output();
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self.iopin.set_low();
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Ok(())
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}
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fn set_high(&mut self) -> Result<(), Self::Error> {
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self.iopin.set_high();
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self.switch_input();
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Ok(())
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}
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}
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