forked from M-Labs/ionpak-thermostat
75 lines
2.4 KiB
Rust
75 lines
2.4 KiB
Rust
use core::slice::{from_raw_parts, from_raw_parts_mut};
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use embedded_hal::digital::v2::{InputPin, OutputPin};
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pub trait Gpio where Self: Sized {
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fn into_output(self) -> GpioOutput<Self>;
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fn into_input(self) -> GpioInput<Self>;
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}
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pub struct GpioInput<PIN>(PIN);
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pub struct GpioOutput<PIN>(PIN);
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macro_rules! def_gpio {
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($PORT: tt, $PIN: tt, $idx: expr) => (
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impl $PIN {
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fn data(&self) -> &u32 {
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let gpio = tm4c129x::$PORT::ptr();
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let data = unsafe { from_raw_parts(gpio as *const _ as *mut u32, 0x100) };
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&data[(1 << $idx) as usize]
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}
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fn data_mut(&mut self) -> &mut u32 {
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let gpio = tm4c129x::$PORT::ptr();
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let data = unsafe { from_raw_parts_mut(gpio as *const _ as *mut u32, 0x100) };
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&mut data[(1 << $idx) as usize]
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}
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}
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impl Gpio for $PIN {
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fn into_output(self) -> GpioOutput<Self> {
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let gpio = unsafe { &*tm4c129x::$PORT::ptr() };
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gpio.dir.modify(|r, w| w.dir().bits(r.dir().bits() | (1 << $idx)));
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gpio.den.modify(|r, w| w.den().bits(r.den().bits() | (1 << $idx)));
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GpioOutput(self)
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}
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fn into_input(self) -> GpioInput<Self> {
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let gpio = unsafe { &*tm4c129x::$PORT::ptr() };
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gpio.dir.modify(|r, w| w.dir().bits(r.dir().bits() & !(1 << $idx)));
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gpio.den.modify(|r, w| w.den().bits(r.den().bits() | (1 << $idx)));
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GpioInput(self)
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}
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}
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impl InputPin for GpioInput<$PIN> {
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type Error = ();
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fn is_high(&self) -> Result<bool, Self::Error> {
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Ok(*self.0.data() != 0)
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}
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fn is_low(&self) -> Result<bool, Self::Error> {
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Ok(*self.0.data() == 0)
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}
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}
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impl OutputPin for GpioOutput<$PIN> {
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type Error = ();
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fn set_low(&mut self) -> Result<(), Self::Error> {
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*self.0.data_mut() = 0;
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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.0.data_mut() = 0xFF;
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Ok(())
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}
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}
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)
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}
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pub struct PB4;
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def_gpio!(GPIO_PORTB_AHB, PB4, 4);
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pub struct PB5;
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def_gpio!(GPIO_PORTB_AHB, PB5, 5);
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pub struct PE4;
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def_gpio!(GPIO_PORTE_AHB, PE4, 4);
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pub struct PE5;
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def_gpio!(GPIO_PORTE_AHB, PE5, 5);
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