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Add fully abstracted GPIO #32

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Add fully abstracted GPIO #32

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181 changes: 180 additions & 1 deletion tm4c-hal/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,10 +12,175 @@ pub mod serial;
pub mod sysctl;
pub mod time;

///! An internal macro to implement the GPIO functionality for a generic GPIO
#[macro_export]
macro_rules! gpio_abstracted_macro {
() => {
/// Fully erased pin
pub struct Pxx<MODE> {
i: u8,
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Maybe s/i/pin/ and s/j/port/?

j: GpioPort,
_mode: PhantomData<MODE>,
}

impl<MODE> StatefulOutputPin for Pxx<Output<MODE>>
where
MODE: OutputMode,
{
fn is_set_high(&self) -> bool {
unsafe {
let data = get_field!(self.j, data);
bb::read_bit(data, self.i)
}
}

fn is_set_low(&self) -> bool {
!self.is_set_high()
}
}

impl<MODE> OutputPin for Pxx<Output<MODE>>
where
MODE: OutputMode,
{
fn set_high(&mut self) {
unsafe {
let data = get_field!(self.j, data);
bb::change_bit(data, self.i, true);
}
}

fn set_low(&mut self) {
unsafe {
let data = get_field!(self.j, data);
bb::change_bit(data, self.i, false);
}
}
}

impl<MODE> InputPin for Pxx<Input<MODE>>
where
MODE: InputMode,
{
fn is_high(&self) -> bool {
unsafe {
let data = get_field!(self.j, data);
bb::read_bit(data, self.i)
}
}

fn is_low(&self) -> bool {
!self.is_high()
}
}

impl<MODE> Pxx<Input<MODE>>
where
MODE: InputMode,
{
/// Enables or disables interrupts on this GPIO pin.
pub fn set_interrupt_mode(&mut self, mode: InterruptMode) {
unsafe {
let im = get_field!(self.j, im);
let is = get_field!(self.j, is);
let ibe = get_field!(self.j, iev);
let iev = get_field!(self.j, iev);

bb::change_bit(im, self.i, false);

match mode {
InterruptMode::LevelHigh => {
// IM &= ~self.i;
bb::change_bit(im, self.i, false);
// IS |= self.i;
bb::change_bit(is, self.i, true);
// IBE &= ~self.i;
bb::change_bit(ibe, self.i, false);
// IEV |= self.i;
bb::change_bit(iev, self.i, true);
// IM |= self.i;
bb::change_bit(im, self.i, true);
}
InterruptMode::LevelLow => {
// IM &= ~self.i;
bb::change_bit(im, self.i, false);
// IS |= self.i;
bb::change_bit(is, self.i, true);
// IBE &= ~self.i;
bb::change_bit(ibe, self.i, false);
// IEV &= ~self.i;
bb::change_bit(iev, self.i, false);
// IM |= self.i;
bb::change_bit(im, self.i, true);
}
InterruptMode::EdgeRising => {
// IM &= ~self.i;
bb::change_bit(im, self.i, false);
// IS &= ~self.i;
bb::change_bit(is, self.i, false);
// IBE &= ~self.i;
bb::change_bit(ibe, self.i, false);
// IEV |= self.i;
bb::change_bit(iev, self.i, true);
// IM |= self.i;
bb::change_bit(im, self.i, true);
}
InterruptMode::EdgeFalling => {
// IM &= ~self.i;
bb::change_bit(im, self.i, false);
// IS &= ~self.i;
bb::change_bit(is, self.i, false);
// IBE &= ~self.i;
bb::change_bit(ibe, self.i, false);
// IEV &= ~self.i;
bb::change_bit(iev, self.i, false);
// IM |= self.i;
bb::change_bit(im, self.i, true);
}
InterruptMode::EdgeBoth => {
// IM &= ~self.i;
bb::change_bit(im, self.i, false);
// IS &= ~self.i;
bb::change_bit(is, self.i, false);
// IBE |= self.i;
bb::change_bit(ibe, self.i, true);
// IEV |= self.i;
bb::change_bit(iev, self.i, true);
// IM |= self.i;
bb::change_bit(im, self.i, true);
}
InterruptMode::Disabled => {
// IM &= ~self.i;
bb::change_bit(im, self.i, false);
}
}
}
}

/// Returns the current interrupt status for this pin.
pub fn get_interrupt_status(&self) -> bool {
unsafe {
let mis = get_field!(self.j, mis);
bb::read_bit(mis, self.i)
}
}

/// Marks the interrupt for this pin as handled. You should
/// call this (or perform its functionality) from the ISR.
pub fn clear_interrupt(&self) {
unsafe {
let icr = get_field!(self.j, icr);
bb::change_bit(icr, self.i, true);
}
}
}
};
}

///! An internal macro to implement the GPIO functionality for each port
#[macro_export]
macro_rules! gpio_macro {
($chip_crate:ident, $GPIOX:ident, $gpiox:ident, $iopd:ident, $PXx:ident, [
($chip_crate:ident, $GPIOX:ident, $gpiox:ident, $iopd:ident, $PXx:ident, $j:expr, [
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What's the $j parameter for?

$($PXi:ident: ($pxi:ident, $i:expr, $MODE:ty),)+
]) => {
/// GPIO
Expand Down Expand Up @@ -64,6 +229,20 @@ macro_rules! gpio_macro {
_mode: PhantomData<MODE>,
}

impl<MODE> $PXx<MODE> {
/// Erases the port number from the type
///
/// This is useful when you want to collect the pins into an array where you
/// need all the elements to have the same type
pub fn downgrade(self) -> Pxx<MODE> {
Pxx {
i: self.i,
j: GpioPort::$iopd,
_mode: self._mode,
}
}
}

impl<MODE> StatefulOutputPin for $PXx<Output<MODE>> where MODE: OutputMode {
fn is_set_high(&self) -> bool {
let p = unsafe { &*$GPIOX::ptr() };
Expand Down
39 changes: 32 additions & 7 deletions tm4c123x-hal/src/gpio.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,17 @@ use crate::{
sysctl,
};
use core::marker::PhantomData;
use tm4c_hal::gpio_macro;
use tm4c_hal::{gpio_abstracted_macro, gpio_macro};

#[derive(PartialEq, Eq)]
enum GpioPort {
GpioA,
GpioB,
GpioC,
GpioD,
GpioE,
GpioF,
}

/// Extension trait to split a GPIO peripheral in independent pins and registers
pub trait GpioExt {
Expand All @@ -51,7 +61,7 @@ pub trait GpioExt {
fn split(self, power_control: &sysctl::PowerControl) -> Self::Parts;
}

gpio_macro!(tm4c123x, GPIO_PORTA, gpioa, GpioA, PAx, [
gpio_macro!(tm4c123x, GPIO_PORTA, gpioa, GpioA, PAx, 0, [
PA0: (pa0, 0, Tristate),
PA1: (pa1, 1, Tristate),
PA2: (pa2, 2, Tristate),
Expand All @@ -62,7 +72,7 @@ gpio_macro!(tm4c123x, GPIO_PORTA, gpioa, GpioA, PAx, [
PA7: (pa7, 7, Tristate),
]);

gpio_macro!(tm4c123x, GPIO_PORTB, gpiob, GpioB, PBx, [
gpio_macro!(tm4c123x, GPIO_PORTB, gpiob, GpioB, PBx, 1, [
PB0: (pb0, 0, Tristate),
PB1: (pb1, 1, Tristate),
PB2: (pb2, 2, Tristate),
Expand All @@ -73,7 +83,7 @@ gpio_macro!(tm4c123x, GPIO_PORTB, gpiob, GpioB, PBx, [
PB7: (pb7, 7, Tristate),
]);

gpio_macro!(tm4c123x, GPIO_PORTC, gpioc, GpioC, PCx, [
gpio_macro!(tm4c123x, GPIO_PORTC, gpioc, GpioC, PCx, 2, [
PC0: (pc0, 0, Locked), // JTAG/SWD pin
PC1: (pc1, 1, Locked), // JTAG/SWD pin
PC2: (pc2, 2, Locked), // JTAG/SWD pin
Expand All @@ -84,7 +94,7 @@ gpio_macro!(tm4c123x, GPIO_PORTC, gpioc, GpioC, PCx, [
PC7: (pc7, 7, Tristate),
]);

gpio_macro!(tm4c123x, GPIO_PORTD, gpiod, GpioD, PDx, [
gpio_macro!(tm4c123x, GPIO_PORTD, gpiod, GpioD, PDx, 3, [
PD0: (pd0, 0, Tristate),
PD1: (pd1, 1, Tristate),
PD2: (pd2, 2, Tristate),
Expand All @@ -95,7 +105,7 @@ gpio_macro!(tm4c123x, GPIO_PORTD, gpiod, GpioD, PDx, [
PD7: (pd7, 7, Locked), // NMI pin
]);

gpio_macro!(tm4c123x, GPIO_PORTE, gpioe, GpioE, PEx, [
gpio_macro!(tm4c123x, GPIO_PORTE, gpioe, GpioE, PEx, 4, [
PE0: (pe0, 0, Tristate),
PE1: (pe1, 1, Tristate),
PE2: (pe2, 2, Tristate),
Expand All @@ -106,7 +116,7 @@ gpio_macro!(tm4c123x, GPIO_PORTE, gpioe, GpioE, PEx, [
PE7: (pe7, 7, Tristate),
]);

gpio_macro!(tm4c123x, GPIO_PORTF, gpiof, GpioF, PFx, [
gpio_macro!(tm4c123x, GPIO_PORTF, gpiof, GpioF, PFx, 5, [
PF0: (pf0, 0, Locked), // NMI pin
PF1: (pf1, 1, Tristate),
PF2: (pf2, 2, Tristate),
Expand All @@ -116,3 +126,18 @@ gpio_macro!(tm4c123x, GPIO_PORTF, gpiof, GpioF, PFx, [
PF6: (pf6, 6, Tristate),
PF7: (pf7, 7, Tristate),
]);

macro_rules! get_field {
($j:expr, $field:ident) => {
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What's the field parameter for?

match $j {
GpioPort::GpioA => &(*tm4c123x::GPIO_PORTA_AHB::ptr()).data,
GpioPort::GpioB => &(*tm4c123x::GPIO_PORTB_AHB::ptr()).data,
GpioPort::GpioC => &(*tm4c123x::GPIO_PORTC_AHB::ptr()).data,
GpioPort::GpioD => &(*tm4c123x::GPIO_PORTD_AHB::ptr()).data,
GpioPort::GpioE => &(*tm4c123x::GPIO_PORTE_AHB::ptr()).data,
GpioPort::GpioF => &(*tm4c123x::GPIO_PORTF_AHB::ptr()).data,
}
};
}

gpio_abstracted_macro!();
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