74 lines
2.5 KiB
Rust
74 lines
2.5 KiB
Rust
use core::mem::transmute;
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use core::slice::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 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(|_, w| w.dir().bits(1 << $idx));
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gpio.den.modify(|_, w| w.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(|_, w| w.dir().bits(1 << $idx));
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gpio.den.modify(|_, w| w.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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let gpio = unsafe { &*tm4c129x::$PORT::ptr() };
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Ok(gpio.data.read().data().bits() & (1 << $idx) == (1 << $idx))
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}
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fn is_low(&self) -> Result<bool, Self::Error> {
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let gpio = unsafe { &*tm4c129x::$PORT::ptr() };
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Ok(gpio.data.read().data().bits() & (1 << $idx) != (1 << $idx))
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}
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}
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impl OutputPin for GpioOutput<$PIN> {
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type Error = ();
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fn set_low(&mut self) -> Result<(), Self::Error> {
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let gpio = unsafe { &*tm4c129x::$PORT::ptr() };
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let data = masked_data(unsafe { transmute(&gpio.data) }, $idx);
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*data = 0;
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Ok(())
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}
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fn set_high(&mut self) -> Result<(), Self::Error> {
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let gpio = unsafe { &*tm4c129x::$PORT::ptr() };
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let data = masked_data(unsafe { transmute(&gpio.data) }, $idx);
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*data = 1 << $idx;
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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, 5);
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pub struct PE5;
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def_gpio!(GPIO_PORTE_AHB, PE5, 5);
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/// Setting of GPIO pins is optimized by address masking
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fn masked_data<'a>(data: *mut u32, bits: u8) -> &'a mut u32 {
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let data = unsafe { from_raw_parts_mut(data, 0x100) };
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&mut data[usize::from(bits)]
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}
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