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use core::marker::PhantomData;
use core::sync::atomic::{AtomicU32, Ordering};
pub trait GpioExt {
type Parts;
fn split(self) -> Self::Parts;
}
pub struct Unknown;
pub struct Input<MODE> {
_mode: PhantomData<MODE>,
}
pub struct Floating;
pub struct PullUp;
pub struct Output<MODE> {
_mode: PhantomData<MODE>,
}
pub struct Regular<INVERT> {
_mode: PhantomData<INVERT>,
}
pub struct Drive<INVERT> {
_mode: PhantomData<INVERT>,
}
pub struct IOF0<INVERT> {
_mode: PhantomData<INVERT>,
}
pub struct IOF1<INVERT> {
_mode: PhantomData<INVERT>,
}
pub struct NoInvert;
pub struct Invert;
trait PinIndex {
const INDEX: usize;
}
#[inline(always)]
fn atomic_set_bit(r: &AtomicU32, index: usize, bit: bool) {
let mask = 1 << (index & 31);
match bit {
true => r.fetch_or(mask, Ordering::SeqCst),
false => r.fetch_and(!mask, Ordering::SeqCst),
};
}
trait PeripheralAccess {
fn peripheral() -> &'static e310x::gpio0::RegisterBlock;
fn input_value(index: usize) -> bool {
let p = Self::peripheral();
(p.input_val.read().bits() >> (index & 31) & 1) != 0
}
fn set_input_en(index: usize, bit: bool) {
let p = Self::peripheral();
let r: &AtomicU32 = unsafe { core::mem::transmute(&p.input_en) };
atomic_set_bit(r, index, bit);
}
fn set_output_en(index: usize, bit: bool) {
let p = Self::peripheral();
let r: &AtomicU32 = unsafe { core::mem::transmute(&p.output_en) };
atomic_set_bit(r, index, bit);
}
fn set_output_value(index: usize, bit: bool) {
let p = Self::peripheral();
let r: &AtomicU32 = unsafe { core::mem::transmute(&p.output_val) };
atomic_set_bit(r, index, bit);
}
fn toggle_pin(index: usize) {
let p = Self::peripheral();
let r: &AtomicU32 = unsafe { core::mem::transmute(&p.output_val) };
let mask = 1 << (index & 31);
r.fetch_xor(mask, Ordering::SeqCst);
}
fn set_pullup(index: usize, bit: bool) {
let p = Self::peripheral();
let r: &AtomicU32 = unsafe { core::mem::transmute(&p.pullup) };
atomic_set_bit(r, index, bit);
}
fn set_drive(index: usize, bit: bool) {
let p = Self::peripheral();
let r: &AtomicU32 = unsafe { core::mem::transmute(&p.drive) };
atomic_set_bit(r, index, bit);
}
fn set_out_xor(index: usize, bit: bool) {
let p = Self::peripheral();
let r: &AtomicU32 = unsafe { core::mem::transmute(&p.out_xor) };
atomic_set_bit(r, index, bit);
}
fn set_iof_en(index: usize, bit: bool) {
let p = Self::peripheral();
let r: &AtomicU32 = unsafe { core::mem::transmute(&p.iof_en) };
atomic_set_bit(r, index, bit);
}
fn set_iof_sel(index: usize, bit: bool) {
let p = Self::peripheral();
let r: &AtomicU32 = unsafe { core::mem::transmute(&p.iof_sel) };
atomic_set_bit(r, index, bit);
}
}
macro_rules! gpio {
($GPIOX:ident, $gpiox:ident, [
$($PXi:ident: ($pxi:ident, $i:expr, $MODE:ty),)+
]) => {
pub mod $gpiox {
use core::marker::PhantomData;
use core::convert::Infallible;
use embedded_hal::digital::v2::{InputPin, OutputPin, StatefulOutputPin,
ToggleableOutputPin};
use e310x::$GPIOX;
use super::{Unknown, IOF0, IOF1, Drive, Floating, GpioExt, Input, Invert,
NoInvert, Output, PullUp, Regular, PinIndex, PeripheralAccess};
pub struct Parts {
$(
pub $pxi: $PXi<$MODE>,
)+
}
impl PeripheralAccess for $GPIOX {
#[inline(always)]
fn peripheral() -> &'static e310x::gpio0::RegisterBlock {
unsafe { &*$GPIOX::ptr() }
}
}
impl GpioExt for $GPIOX {
type Parts = Parts;
fn split(self) -> Parts {
Parts {
$(
$pxi: $PXi { _mode: PhantomData },
)+
}
}
}
$(
pub struct $PXi<MODE> {
_mode: PhantomData<MODE>,
}
impl<MODE> PinIndex for $PXi<MODE> {
const INDEX: usize = $i;
}
impl<MODE> $PXi<MODE> {
pub fn into_iof0(self) -> $PXi<IOF0<NoInvert>> {
$GPIOX::set_out_xor(Self::INDEX, false);
$GPIOX::set_iof_sel(Self::INDEX, false);
$GPIOX::set_iof_en(Self::INDEX, true);
$PXi { _mode: PhantomData }
}
pub fn into_iof1(self) -> $PXi<IOF1<NoInvert>> {
$GPIOX::set_out_xor(Self::INDEX, false);
$GPIOX::set_iof_sel(Self::INDEX, true);
$GPIOX::set_iof_en(Self::INDEX, true);
$PXi { _mode: PhantomData }
}
pub fn into_inverted_iof0(self) -> $PXi<IOF0<Invert>> {
$GPIOX::set_out_xor(Self::INDEX, true);
$GPIOX::set_iof_sel(Self::INDEX, false);
$GPIOX::set_iof_en(Self::INDEX, true);
$PXi { _mode: PhantomData }
}
pub fn into_inverted_iof1(self) -> $PXi<IOF1<Invert>> {
$GPIOX::set_out_xor(Self::INDEX, true);
$GPIOX::set_iof_sel(Self::INDEX, true);
$GPIOX::set_iof_en(Self::INDEX, true);
$PXi { _mode: PhantomData }
}
pub fn into_floating_input(self) -> $PXi<Input<Floating>> {
$GPIOX::set_pullup(Self::INDEX, false);
$GPIOX::set_input_en(Self::INDEX, true);
$GPIOX::set_iof_en(Self::INDEX, false);
$PXi { _mode: PhantomData }
}
pub fn into_pull_up_input(self) -> $PXi<Input<PullUp>> {
$GPIOX::set_pullup(Self::INDEX, true);
$GPIOX::set_input_en(Self::INDEX, true);
$GPIOX::set_iof_en(Self::INDEX, false);
$PXi { _mode: PhantomData }
}
pub fn into_output(self) -> $PXi<Output<Regular<NoInvert>>> {
$GPIOX::set_drive(Self::INDEX, false);
$GPIOX::set_out_xor(Self::INDEX, false);
$GPIOX::set_output_en(Self::INDEX, true);
$GPIOX::set_iof_en(Self::INDEX, false);
$PXi { _mode: PhantomData }
}
pub fn into_inverted_output(self) -> $PXi<Output<Regular<Invert>>> {
$GPIOX::set_drive(Self::INDEX, false);
$GPIOX::set_out_xor(Self::INDEX, true);
$GPIOX::set_output_en(Self::INDEX, true);
$GPIOX::set_iof_en(Self::INDEX, false);
$PXi { _mode: PhantomData }
}
pub fn into_output_drive(self) -> $PXi<Output<Drive<NoInvert>>> {
$GPIOX::set_drive(Self::INDEX, true);
$GPIOX::set_out_xor(Self::INDEX, false);
$GPIOX::set_output_en(Self::INDEX, true);
$GPIOX::set_iof_en(Self::INDEX, false);
$PXi { _mode: PhantomData }
}
pub fn into_inverted_output_drive(self) -> $PXi<Output<Drive<Invert>>> {
$GPIOX::set_drive(Self::INDEX, true);
$GPIOX::set_out_xor(Self::INDEX, true);
$GPIOX::set_output_en(Self::INDEX, true);
$GPIOX::set_iof_en(Self::INDEX, false);
$PXi { _mode: PhantomData }
}
}
impl<MODE> InputPin for $PXi<Input<MODE>> {
type Error = Infallible;
fn is_high(&self) -> Result<bool, Infallible> {
Ok($GPIOX::input_value(Self::INDEX))
}
fn is_low(&self) -> Result<bool, Infallible> {
Ok(!self.is_high()?)
}
}
impl<MODE> StatefulOutputPin for $PXi<Output<MODE>> {
fn is_set_high(&self) -> Result<bool, Infallible> {
Ok($GPIOX::input_value(Self::INDEX))
}
fn is_set_low(&self) -> Result<bool, Infallible> {
Ok(!self.is_set_high()?)
}
}
impl<MODE> OutputPin for $PXi<Output<MODE>> {
type Error = Infallible;
fn set_high(&mut self) -> Result<(), Infallible> {
$GPIOX::set_output_value(Self::INDEX, true);
Ok(())
}
fn set_low(&mut self) -> Result<(), Infallible> {
$GPIOX::set_output_value(Self::INDEX, false);
Ok(())
}
}
impl<MODE> ToggleableOutputPin for $PXi<Output<MODE>> {
type Error = Infallible;
fn toggle(&mut self) -> Result<(), Infallible> {
$GPIOX::toggle_pin(Self::INDEX);
Ok(())
}
}
)+
}
}
}
gpio!(GPIO0, gpio0, [
Pin0: (pin0, 0, Unknown),
Pin1: (pin1, 1, Unknown),
Pin2: (pin2, 2, Unknown),
Pin3: (pin3, 3, Unknown),
Pin4: (pin4, 4, Unknown),
Pin5: (pin5, 5, Unknown),
Pin6: (pin6, 6, Unknown),
Pin7: (pin7, 7, Unknown),
Pin8: (pin8, 8, Unknown),
Pin9: (pin9, 9, Unknown),
Pin10: (pin10, 10, Unknown),
Pin11: (pin11, 11, Unknown),
Pin12: (pin12, 12, Unknown),
Pin13: (pin13, 13, Unknown),
Pin14: (pin14, 14, Unknown),
Pin15: (pin15, 15, Unknown),
Pin16: (pin16, 16, Unknown),
Pin17: (pin17, 17, Unknown),
Pin18: (pin18, 18, Unknown),
Pin19: (pin19, 19, Unknown),
Pin20: (pin20, 20, Unknown),
Pin21: (pin21, 21, Unknown),
Pin22: (pin22, 22, Unknown),
Pin23: (pin23, 23, Unknown),
Pin24: (pin24, 24, Unknown),
Pin25: (pin25, 25, Unknown),
Pin26: (pin26, 26, Unknown),
Pin27: (pin27, 27, Unknown),
Pin28: (pin28, 28, Unknown),
Pin29: (pin29, 29, Unknown),
Pin30: (pin30, 30, Unknown),
Pin31: (pin31, 31, Unknown),
]);