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board: refactor gpio to use indexed access

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This commit is contained in:
Astro 2019-09-01 22:57:35 +02:00
parent 5ba09db517
commit e947415242
1 changed files with 19 additions and 11 deletions
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30
firmware/src/board/gpio.rs
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@ -1,5 +1,5 @@
use core::mem::transmute;
use core::slice::from_raw_parts_mut;
use core::slice::{from_raw_parts, from_raw_parts_mut};
use embedded_hal::digital::v2::{InputPin, OutputPin};
pub trait Gpio where Self: Sized {
@ -12,6 +12,20 @@ pub struct GpioOutput<PIN>(PIN);
macro_rules! def_gpio {
($PORT: tt, $PIN: tt, $idx: expr) => (
impl $PIN {
fn data(&self) -> &u32 {
let gpio = unsafe { tm4c129x::$PORT::ptr() };
let data = unsafe { from_raw_parts(gpio as *const _ as *mut u32, 0x100) };
&data[(1 << $idx) as usize]
}
fn data_mut(&mut self) -> &mut u32 {
let gpio = unsafe { tm4c129x::$PORT::ptr() };
let data = unsafe { from_raw_parts_mut(gpio as *const _ as *mut u32, 0x100) };
&mut data[(1 << $idx) as usize]
}
}
impl Gpio for $PIN {
fn into_output(self) -> GpioOutput<Self> {
let gpio = unsafe { &*tm4c129x::$PORT::ptr() };
@ -30,27 +44,21 @@ macro_rules! def_gpio {
impl InputPin for GpioInput<$PIN> {
type Error = ();
fn is_high(&self) -> Result<bool, Self::Error> {
let gpio = unsafe { &*tm4c129x::$PORT::ptr() };
Ok(gpio.data.read().data().bits() & (1 << $idx) == (1 << $idx))
Ok(*self.0.data() != 0)
}
fn is_low(&self) -> Result<bool, Self::Error> {
let gpio = unsafe { &*tm4c129x::$PORT::ptr() };
Ok(gpio.data.read().data().bits() & (1 << $idx) != (1 << $idx))
Ok(*self.0.data() == 0)
}
}
impl OutputPin for GpioOutput<$PIN> {
type Error = ();
fn set_low(&mut self) -> Result<(), Self::Error> {
let gpio = unsafe { &*tm4c129x::$PORT::ptr() };
let data = masked_data(unsafe { transmute(&gpio.data) }, (1 << $idx));
*data = 0;
*self.0.data_mut() = 0;
Ok(())
}
fn set_high(&mut self) -> Result<(), Self::Error> {
let gpio = unsafe { &*tm4c129x::$PORT::ptr() };
let data = masked_data(unsafe { transmute(&gpio.data) }, (1 << $idx));
*data = 1 << $idx;
*self.0.data_mut() = 0xFF;
Ok(())
}
}