add gpio abstraction

This commit is contained in:
Astro 2019-07-30 18:25:35 +02:00
parent e4478c3efd
commit 5f3d674e24
5 changed files with 100 additions and 0 deletions

23
firmware/Cargo.lock generated
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@ -94,6 +94,15 @@ dependencies = [
"build_const 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)", "build_const 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
] ]
[[package]]
name = "embedded-hal"
version = "0.2.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
dependencies = [
"nb 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
"void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
]
[[package]] [[package]]
name = "generic-array" name = "generic-array"
version = "0.12.3" version = "0.12.3"
@ -109,6 +118,7 @@ dependencies = [
"cortex-m 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)", "cortex-m 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
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"crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)", "crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
"embedded-hal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
"libm 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)", "libm 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
"smoltcp 0.4.0 (git+https://github.com/m-labs/smoltcp?rev=cd893e6)", "smoltcp 0.4.0 (git+https://github.com/m-labs/smoltcp?rev=cd893e6)",
"tm4c129x 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)", "tm4c129x 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
@ -134,6 +144,11 @@ name = "managed"
version = "0.5.1" version = "0.5.1"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "nb"
version = "0.1.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]] [[package]]
name = "proc-macro2" name = "proc-macro2"
version = "0.4.30" version = "0.4.30"
@ -257,6 +272,11 @@ name = "vcell"
version = "0.1.0" version = "0.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "void"
version = "1.0.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]] [[package]]
name = "volatile-register" name = "volatile-register"
version = "0.2.0" version = "0.2.0"
@ -298,10 +318,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -12,6 +12,7 @@ cortex-m = { version = "0.5", features = ["const-fn"] }
cortex-m-rt = "0.6" cortex-m-rt = "0.6"
crc = { version = "1.7", default-features = false } crc = { version = "1.7", default-features = false }
tm4c129x = { version = "0.8", features = ["rt"] } tm4c129x = { version = "0.8", features = ["rt"] }
embedded-hal = { version = "0.2", features = ["unproven"] }
[dependencies.smoltcp] [dependencies.smoltcp]
git = "https://github.com/m-labs/smoltcp" git = "https://github.com/m-labs/smoltcp"

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@ -0,0 +1,73 @@
use core::mem::transmute;
use core::slice::from_raw_parts_mut;
use embedded_hal::digital::v2::{InputPin, OutputPin};
pub trait Gpio where Self: Sized {
fn into_output(self) -> GpioOutput<Self>;
fn into_input(self) -> GpioInput<Self>;
}
pub struct GpioInput<PIN>(PIN);
pub struct GpioOutput<PIN>(PIN);
macro_rules! def_gpio {
($PORT: tt, $PIN: tt, $idx: expr) => (
impl Gpio for $PIN {
fn into_output(self) -> GpioOutput<Self> {
let gpio = unsafe { &*tm4c129x::$PORT::ptr() };
gpio.dir.modify(|_, w| w.dir().bits(1 << $idx));
gpio.den.modify(|_, w| w.den().bits(1 << $idx));
GpioOutput(self)
}
fn into_input(self) -> GpioInput<Self> {
let gpio = unsafe { &*tm4c129x::$PORT::ptr() };
gpio.dir.modify(|_, w| w.dir().bits(1 << $idx));
gpio.den.modify(|_, w| w.den().bits(1 << $idx));
GpioInput(self)
}
}
impl InputPin for GpioInput<$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 << $idx))
}
fn is_low(&self) -> Result<bool, Self::Error> {
let gpio = unsafe { &*tm4c129x::$PORT::ptr() };
Ok(gpio.data.read().data().bits() & (1 << $idx) != (1 << $idx))
}
}
impl OutputPin for GpioOutput<$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) }, $idx);
*data = 0;
Ok(())
}
fn set_high(&mut self) -> Result<(), Self::Error> {
let gpio = unsafe { &*tm4c129x::$PORT::ptr() };
let data = masked_data(unsafe { transmute(&gpio.data) }, $idx);
*data = 1 << $idx;
Ok(())
}
}
)
}
pub struct PB4;
def_gpio!(GPIO_PORTB_AHB, PB4, 4);
pub struct PB5;
def_gpio!(GPIO_PORTB_AHB, PB5, 5);
pub struct PE4;
def_gpio!(GPIO_PORTE_AHB, PE4, 5);
pub struct PE5;
def_gpio!(GPIO_PORTE_AHB, PE5, 5);
/// Setting of GPIO pins is optimized by address masking
fn masked_data<'a>(data: *mut u32, bits: u8) -> &'a mut u32 {
let data = unsafe { from_raw_parts_mut(data, 0x100) };
&mut data[usize::from(bits)]
}

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@ -1,6 +1,8 @@
use cortex_m; use cortex_m;
use tm4c129x; use tm4c129x;
mod gpio;
const LED1: u8 = 0x10; // PK4 const LED1: u8 = 0x10; // PK4
const LED2: u8 = 0x40; // PK6 const LED2: u8 = 0x40; // PK6

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@ -10,6 +10,7 @@ extern crate cortex_m_rt;
extern crate tm4c129x; extern crate tm4c129x;
extern crate smoltcp; extern crate smoltcp;
extern crate crc; extern crate crc;
extern crate embedded_hal;
use core::cell::{Cell, RefCell}; use core::cell::{Cell, RefCell};
use core::fmt; use core::fmt;