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//! General Purpose Input / Output
use core::marker::PhantomData;
/// Extension trait to split a GPIO peripheral in independent pins and registers
pub trait GpioExt {
/// The parts to split the GPIO into
type Parts;
/// Splits the GPIO block into independent pins and registers
fn split(self) -> Self::Parts;
}
pub struct AF0;
pub struct AF1;
pub struct AF2;
pub struct AF3;
pub struct AF4;
pub struct AF5;
pub struct AF6;
pub struct AF7;
pub struct Alternate<MODE> {
_mode: PhantomData<MODE>,
}
/// Input mode (type state)
pub struct Input<MODE> {
_mode: PhantomData<MODE>,
}
/// Floating input (type state)
pub struct Floating;
/// Pulled down input (type state)
pub struct PullDown;
/// Pulled up input (type state)
pub struct PullUp;
/// Open drain input or output (type state)
pub struct OpenDrain;
/// Output mode (type state)
pub struct Output<MODE> {
_mode: PhantomData<MODE>,
}
/// Push pull output (type state)
pub struct PushPull;
macro_rules! gpio {
($GPIOX:ident, $gpiox:ident, $iopxenr:ident, $PXx:ident, [
$($PXi:ident: ($pxi:ident, $i:expr, $MODE:ty),)+
]) => {
/// GPIO
pub mod $gpiox {
use core::marker::PhantomData;
use hal::digital::{InputPin, OutputPin, StatefulOutputPin};
use stm32::$GPIOX;
use stm32::RCC;
use super::{
Alternate, Floating, GpioExt, Input, OpenDrain, Output,
PullDown, PullUp, PushPull, AF0, AF1, AF2, AF3, AF4, AF5, AF6, AF7,
};
/// GPIO parts
pub struct Parts {
$(
/// Pin
pub $pxi: $PXi<$MODE>,
)+
}
impl GpioExt for $GPIOX {
type Parts = Parts;
fn split(self) -> Parts {
// NOTE(unsafe) This executes only during initialisation
let rcc = unsafe { &(*RCC::ptr()) };
rcc.ahbenr.modify(|_, w| w.$iopxenr().set_bit());
Parts {
$(
$pxi: $PXi { _mode: PhantomData },
)+
}
}
}
/// Partially erased pin
pub struct $PXx<MODE> {
i: u8,
_mode: PhantomData<MODE>,
}
impl<MODE> StatefulOutputPin for $PXx<Output<MODE>> {
fn is_set_high(&self) -> bool {
!self.is_set_low()
}
fn is_set_low(&self) -> bool {
// NOTE(unsafe) atomic read with no side effects
unsafe { (*$GPIOX::ptr()).odr.read().bits() & (1 << self.i) == 0 }
}
}
impl<MODE> OutputPin for $PXx<Output<MODE>> {
fn set_high(&mut self) {
// NOTE(unsafe) atomic write to a stateless register
unsafe { (*$GPIOX::ptr()).bsrr.write(|w| w.bits(1 << self.i)) }
}
fn set_low(&mut self) {
// NOTE(unsafe) atomic write to a stateless register
unsafe { (*$GPIOX::ptr()).bsrr.write(|w| w.bits(1 << (self.i + 16))) }
}
}
impl<MODE> InputPin for $PXx<Input<MODE>> {
fn is_high(&self) -> bool {
!self.is_low()
}
fn is_low(&self) -> bool {
// NOTE(unsafe) atomic read with no side effects
unsafe { (*$GPIOX::ptr()).idr.read().bits() & (1 << self.i) == 0 }
}
}
fn _set_alternate_mode (index:usize, mode: u32)
{
let offset = 2 * index;
let offset2 = 4 * index;
unsafe {
if offset2 < 32 {
&(*$GPIOX::ptr()).afrl.modify(|r, w| {
w.bits((r.bits() & !(0b1111 << offset2)) | (mode << offset2))
});
} else
{
let offset2 = offset2 - 32;
&(*$GPIOX::ptr()).afrh.modify(|r, w| {
w.bits((r.bits() & !(0b1111 << offset2)) | (mode << offset2))
});
}
&(*$GPIOX::ptr()).moder.modify(|r, w| {
w.bits((r.bits() & !(0b11 << offset)) | (0b10 << offset))
});
}
}
$(
/// Pin
pub struct $PXi<MODE> {
_mode: PhantomData<MODE>,
}
impl<MODE> $PXi<MODE> {
/// Configures the pin to operate in AF0 mode
pub fn into_alternate_af0(
self,
) -> $PXi<Alternate<AF0>> {
_set_alternate_mode($i, 0);
$PXi { _mode: PhantomData }
}
/// Configures the pin to operate in AF1 mode
pub fn into_alternate_af1(
self,
) -> $PXi<Alternate<AF1>> {
_set_alternate_mode($i, 1);
$PXi { _mode: PhantomData }
}
/// Configures the pin to operate in AF2 mode
pub fn into_alternate_af2(
self,
) -> $PXi<Alternate<AF2>> {
_set_alternate_mode($i, 2);
$PXi { _mode: PhantomData }
}
/// Configures the pin to operate in AF3 mode
pub fn into_alternate_af3(
self,
) -> $PXi<Alternate<AF3>> {
_set_alternate_mode($i, 3);
$PXi { _mode: PhantomData }
}
/// Configures the pin to operate in AF4 mode
pub fn into_alternate_af4(
self,
) -> $PXi<Alternate<AF4>> {
_set_alternate_mode($i, 4);
$PXi { _mode: PhantomData }
}
/// Configures the pin to operate in AF5 mode
pub fn into_alternate_af5(
self,
) -> $PXi<Alternate<AF5>> {
_set_alternate_mode($i, 5);
$PXi { _mode: PhantomData }
}
/// Configures the pin to operate in AF6 mode
pub fn into_alternate_af6(
self,
) -> $PXi<Alternate<AF6>> {
_set_alternate_mode($i, 6);
$PXi { _mode: PhantomData }
}
/// Configures the pin to operate in AF7 mode
pub fn into_alternate_af7(
self,
) -> $PXi<Alternate<AF7>> {
_set_alternate_mode($i, 7);
$PXi { _mode: PhantomData }
}
/// Configures the pin to operate as a floating input pin
pub fn into_floating_input(
self,
) -> $PXi<Input<Floating>> {
let offset = 2 * $i;
unsafe {
&(*$GPIOX::ptr()).pupdr.modify(|r, w| {
w.bits((r.bits() & !(0b11 << offset)) | (0b00 << offset))
});
&(*$GPIOX::ptr()).moder.modify(|r, w| {
w.bits((r.bits() & !(0b11 << offset)) | (0b00 << offset))
});
}
$PXi { _mode: PhantomData }
}
/// Configures the pin to operate as a pulled down input pin
pub fn into_pull_down_input(
self,
) -> $PXi<Input<PullDown>> {
let offset = 2 * $i;
unsafe {
&(*$GPIOX::ptr()).pupdr.modify(|r, w| {
w.bits((r.bits() & !(0b11 << offset)) | (0b10 << offset))
});
&(*$GPIOX::ptr()).moder.modify(|r, w| {
w.bits((r.bits() & !(0b11 << offset)) | (0b00 << offset))
});
}
$PXi { _mode: PhantomData }
}
/// Configures the pin to operate as a pulled up input pin
pub fn into_pull_up_input(
self,
) -> $PXi<Input<PullUp>> {
let offset = 2 * $i;
unsafe {
&(*$GPIOX::ptr()).pupdr.modify(|r, w| {
w.bits((r.bits() & !(0b11 << offset)) | (0b01 << offset))
});
&(*$GPIOX::ptr()).moder.modify(|r, w| {
w.bits((r.bits() & !(0b11 << offset)) | (0b00 << offset))
});
}
$PXi { _mode: PhantomData }
}
/// Configures the pin to operate as an open drain output pin
pub fn into_open_drain_output(
self,
) -> $PXi<Output<OpenDrain>> {
let offset = 2 * $i;
unsafe {
&(*$GPIOX::ptr()).pupdr.modify(|r, w| {
w.bits((r.bits() & !(0b11 << offset)) | (0b00 << offset))
});
&(*$GPIOX::ptr()).otyper.modify(|r, w| {
w.bits(r.bits() | (0b1 << $i))
});
&(*$GPIOX::ptr()).moder.modify(|r, w| {
w.bits((r.bits() & !(0b11 << offset)) | (0b01 << offset))
});
}
$PXi { _mode: PhantomData }
}
/// Configures the pin to operate as an push pull output pin
pub fn into_push_pull_output(
self,
) -> $PXi<Output<PushPull>> {
let offset = 2 * $i;
unsafe {
&(*$GPIOX::ptr()).pupdr.modify(|r, w| {
w.bits((r.bits() & !(0b11 << offset)) | (0b00 << offset))
});
&(*$GPIOX::ptr()).otyper.modify(|r, w| {
w.bits(r.bits() & !(0b1 << $i))
});
&(*$GPIOX::ptr()).moder.modify(|r, w| {
w.bits((r.bits() & !(0b11 << offset)) | (0b01 << offset))
});
}
$PXi { _mode: PhantomData }
}
/// Configures the pin to operate as an push pull output pin with quick fall
/// and rise times
pub fn into_push_pull_output_hs(
self,
) -> $PXi<Output<PushPull>> {
let offset = 2 * $i;
unsafe {
&(*$GPIOX::ptr()).pupdr.modify(|r, w| {
w.bits((r.bits() & !(0b11 << offset)) | (0b00 << offset))
});
&(*$GPIOX::ptr()).otyper.modify(|r, w| {
w.bits(r.bits() & !(0b1 << $i))
});
&(*$GPIOX::ptr()).ospeedr.modify(|r, w| {
w.bits(r.bits() & !(0b1 << $i))
});
&(*$GPIOX::ptr()).moder.modify(|r, w| {
w.bits((r.bits() & !(0b11 << offset)) | (0b01 << offset))
});
}
$PXi { _mode: PhantomData }
}
}
impl $PXi<Output<OpenDrain>> {
/// Enables / disables the internal pull up
pub fn internal_pull_up(&mut self, on: bool) {
let offset = 2 * $i;
let value = if on { 0b01 } else { 0b00 };
unsafe {
&(*$GPIOX::ptr()).pupdr.modify(|r, w| {
w.bits((r.bits() & !(0b11 << offset)) | (value << offset))
})};
}
}
impl<MODE> $PXi<Alternate<MODE>> {
/// Enables / disables the internal pull up
pub fn internal_pull_up(self, on: bool) -> Self {
let offset = 2 * $i;
let value = if on { 0b01 } else { 0b00 };
unsafe {
&(*$GPIOX::ptr()).pupdr.modify(|r, w| {
w.bits((r.bits() & !(0b11 << offset)) | (value << offset))
})};
self
}
}
impl<MODE> $PXi<Alternate<MODE>> {
/// Turns pin alternate configuration pin into open drain
pub fn set_open_drain(self) -> Self {
let offset = $i;
unsafe {
&(*$GPIOX::ptr()).otyper.modify(|r, w| {
w.bits(r.bits() | (1 << offset))
})};
self
}
}
impl<MODE> $PXi<Output<MODE>> {
/// Erases the pin number from the type
///
/// This is useful when you want to collect the pins into an array where you
/// need all the elements to have the same type
pub fn downgrade(self) -> $PXx<Output<MODE>> {
$PXx {
i: $i,
_mode: self._mode,
}
}
}
impl<MODE> StatefulOutputPin for $PXi<Output<MODE>> {
fn is_set_high(&self) -> bool {
!self.is_set_low()
}
fn is_set_low(&self) -> bool {
// NOTE(unsafe) atomic read with no side effects
unsafe { (*$GPIOX::ptr()).odr.read().bits() & (1 << $i) == 0 }
}
}
impl<MODE> OutputPin for $PXi<Output<MODE>> {
fn set_high(&mut self) {
// NOTE(unsafe) atomic write to a stateless register
unsafe { (*$GPIOX::ptr()).bsrr.write(|w| w.bits(1 << $i)) }
}
fn set_low(&mut self) {
// NOTE(unsafe) atomic write to a stateless register
unsafe { (*$GPIOX::ptr()).bsrr.write(|w| w.bits(1 << ($i + 16))) }
}
}
impl<MODE> $PXi<Input<MODE>> {
/// Erases the pin number from the type
///
/// This is useful when you want to collect the pins into an array where you
/// need all the elements to have the same type
pub fn downgrade(self) -> $PXx<Input<MODE>> {
$PXx {
i: $i,
_mode: self._mode,
}
}
}
impl<MODE> InputPin for $PXi<Input<MODE>> {
fn is_high(&self) -> bool {
!self.is_low()
}
fn is_low(&self) -> bool {
// NOTE(unsafe) atomic read with no side effects
unsafe { (*$GPIOX::ptr()).idr.read().bits() & (1 << $i) == 0 }
}
}
)+
impl<TYPE> $PXx<TYPE> {
pub fn get_id (&self) -> u8
{
self.i
}
}
}
}
}
gpio!(GPIOA, gpioa, iopaen, PA, [
PA0: (pa0, 0, Input<Floating>),
PA1: (pa1, 1, Input<Floating>),
PA2: (pa2, 2, Input<Floating>),
PA3: (pa3, 3, Input<Floating>),
PA4: (pa4, 4, Input<Floating>),
PA5: (pa5, 5, Input<Floating>),
PA6: (pa6, 6, Input<Floating>),
PA7: (pa7, 7, Input<Floating>),
PA9: (pa9, 9, Input<Floating>),
PA10: (pa10, 10, Input<Floating>),
PA13: (pa13, 13, Input<Floating>),
PA14: (pa14, 14, Input<Floating>),
]);
gpio!(GPIOB, gpiob, iopben, PB, [
PB1: (pb1, 1, Input<Floating>),
]);
gpio!(GPIOF, gpiof, iopfen, PF, [
PF0: (pf0, 0, Input<Floating>),
PF1: (pf1, 1, Input<Floating>),
]);