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Get 16-bit timers working

This commit is contained in:
Dylan McKay 2017-12-14 01:33:15 +13:00
parent 274d4611ec
commit d125f69f7d
6 changed files with 216 additions and 162 deletions
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1
src/lib.rs
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@ -19,7 +19,6 @@ pub use self::usart::HardwareUsart;
pub mod prelude;
pub mod serial;
pub mod timer1;
pub mod cores;
pub mod modules;

2
src/modules/mod.rs
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@ -1,7 +1,7 @@
//! Modules that can be implemented for specific cores.
pub use self::spi::HardwareSpi;
pub use self::timer::{Timer8, Timer8Setup};
pub use self::timer::{Timer8, Timer8Setup, Timer16, Timer16Setup};
mod spi;
mod timer;

2
src/modules/timer/mod.rs
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@ -1,4 +1,6 @@
pub use self::timer8::{Timer8, Timer8Setup};
pub use self::timer16::{Timer16, Timer16Setup};
mod timer8;
mod timer16;

211
src/modules/timer/timer16.rs Normal file
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@ -0,0 +1,211 @@
use {Bitset, Mask, Register};
use core::marker;
/// A 16-bit timer.
pub trait Timer16 {
/// The first compare register.
/// For example, OCR0A.
type CompareA: Register<u16>;
/// The second compare register.
/// For example, OCR0B.
type CompareB: Register<u16>;
/// The counter register.
///
/// For example, TCNT0.
type Counter: Register<u16>;
/// The first control register.
///
/// For example, TCCR0A.
type ControlA: Register<u8>;
/// The second control register.
///
/// For example, TCCR0B.
type ControlB: Register<u8>;
/// The third control register.
///
/// For example, TCCR0C.
type ControlC: Register<u8>;
/// The interrupt mask register.
///
/// For example, TIMSK0.
type InterruptMask: Register<u8>;
/// The interrupt flag register.
///
/// For example, TIFR0.
type InterruptFlag: Register<u8>;
const CS0: Mask<u8, Self::ControlB>;
const CS1: Mask<u8, Self::ControlB>;
const CS2: Mask<u8, Self::ControlB>;
const WGM0: Mask<u8, Self::ControlA>;
const WGM1: Mask<u8, Self::ControlA>;
const WGM2: Mask<u8, Self::ControlB>;
const WGM3: Mask<u8, Self::ControlB>; // fixme: right reg?
const OCIEA: Bitset<u8, Self::InterruptMask>;
}
pub enum ClockSource {
None,
Prescale1,
Prescale8,
Prescale64,
Prescale256,
Prescale1024,
ExternalFalling,
ExternalRising,
}
impl ClockSource {
fn bits<T: Timer16>(&self) -> Mask<u8, T::ControlB> {
use self::ClockSource::*;
match *self {
None => Mask::zero() | Mask::zero() | Mask::zero(),
Prescale1 => Mask::zero() | Mask::zero() | T::CS0,
Prescale8 => Mask::zero() | T::CS1 | Mask::zero(),
Prescale64 => Mask::zero() | T::CS1 | T::CS0,
Prescale256 => T::CS2 | Mask::zero() | Mask::zero(),
Prescale1024 => T::CS2 | Mask::zero() | T::CS0,
ExternalFalling => T::CS2 | T::CS1 | Mask::zero(),
ExternalRising => T::CS2 | T::CS1 | T::CS0,
}
}
#[inline]
fn mask<T: Timer16>() -> Mask<u8, T::ControlB> {
!(T::CS2 | T::CS1 | T::CS0)
}
}
pub enum WaveformGenerationMode {
Normal,
PwmPhaseCorrect8Bit,
PwmPhaseCorrect9Bit,
PwmPhaseCorrect10Bit,
ClearOnTimerMatchOutputCompare,
FastPwm8Bit,
FastPwm9Bit,
FastPwm10Bit,
PwmPhaseAndFrequencyCorrectInputCapture,
PwmPhaseAndFrequencyCorrectOutputCompare,
PwmPhaseCorrectInputCapture,
PwmPhaseCorrectOutputCompare,
ClearOnTimerMatchInputCapture,
FastPwmInputCapture,
FastPwmOutputCompare,
}
impl WaveformGenerationMode {
/// Returns bits for TCCR1A, TCCR1B
#[inline]
fn bits<T: Timer16>(&self) -> (Mask<u8, T::ControlA>, Mask<u8, T::ControlB>) {
use self::WaveformGenerationMode::*;
// It makes more sense to return bytes (A,B), but the manual
// lists the table as (B,A). We match the manual here for
// inspection purposes and flip the values for sanity
// purposes.
let (b, a) = match *self {
Normal => (Mask::zero() | Mask::zero(), Mask::zero() | Mask::zero()),
PwmPhaseCorrect8Bit => (Mask::zero() | Mask::zero(), Mask::zero() | T::WGM0),
PwmPhaseCorrect9Bit => (Mask::zero() | Mask::zero(), T::WGM1 | Mask::zero()),
PwmPhaseCorrect10Bit => (Mask::zero() | Mask::zero(), T::WGM1 | T::WGM0),
ClearOnTimerMatchOutputCompare => (Mask::zero() | T::WGM2, Mask::zero() | Mask::zero()),
FastPwm8Bit => (Mask::zero() | T::WGM2, Mask::zero() | T::WGM0),
FastPwm9Bit => (Mask::zero() | T::WGM2, T::WGM1 | Mask::zero()),
FastPwm10Bit => (Mask::zero() | T::WGM2, T::WGM1 | T::WGM0),
PwmPhaseAndFrequencyCorrectInputCapture => (T::WGM3 | Mask::zero(), Mask::zero() | Mask::zero()),
PwmPhaseAndFrequencyCorrectOutputCompare => (T::WGM3 | Mask::zero(), Mask::zero() | T::WGM0),
PwmPhaseCorrectInputCapture => (T::WGM3 | Mask::zero(), T::WGM1 | Mask::zero()),
PwmPhaseCorrectOutputCompare => (T::WGM3 | Mask::zero(), T::WGM1 | T::WGM0),
ClearOnTimerMatchInputCapture => (T::WGM3 | T::WGM2, Mask::zero() | Mask::zero()),
// Reserved => (T::WGM3 | T::WGM2, Mask::zero() | T::WGM0),
FastPwmInputCapture => (T::WGM3 | T::WGM2, T::WGM1 | Mask::zero()),
FastPwmOutputCompare => (T::WGM3 | T::WGM2, T::WGM1 | T::WGM0),
};
(a, b)
}
#[inline]
fn mask<T: Timer16>() -> (Mask<u8, T::ControlA>, Mask<u8, T::ControlB>) {
(!(T::WGM0 | T::WGM1), !(T::WGM2 | T::WGM3))
}
}
pub struct Timer16Setup<T: Timer16> {
a: Mask<u8, T::ControlA>,
b: Mask<u8, T::ControlB>,
c: Mask<u8, T::ControlC>,
output_compare_1: Option<u16>,
_phantom: marker::PhantomData<T>,
}
impl<T: Timer16> Timer16Setup<T> {
#[inline]
pub fn new() -> Self {
Timer16Setup {
a: Mask::zero(),
b: Mask::zero(),
c: Mask::zero(),
output_compare_1: None,
_phantom: marker::PhantomData,
}
}
#[inline]
pub fn clock_source(mut self, source: ClockSource) -> Self {
self.b &= ClockSource::mask::<T>();
self.b |= source.bits::<T>();
self
}
#[inline]
pub fn waveform_generation_mode(mut self, mode: WaveformGenerationMode) -> Self {
let (a, b) = WaveformGenerationMode::mask::<T>();
self.a &= a;
self.b &= b;
let (a, b) = mode.bits::<T>();
self.a |= a;
self.b |= b;
self
}
#[inline]
pub fn output_compare_1(mut self, value: Option<u16>) -> Self {
self.output_compare_1 = value;
self
}
#[inline]
pub fn configure(self) {
unsafe {
T::ControlA::write(self.a);
T::ControlB::write(self.b);
T::ControlC::write(self.c);
// Reset counter to zero
T::Counter::write(0u16);
if let Some(v) = self.output_compare_1 {
// Set the match
T::CompareA::write(v);
// Enable compare interrupt
// FIXME: uncomment
// write_volatile(TIMSK1, OCIE1A);
}
}
}
}

3
src/modules/timer/timer8.rs
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@ -1,7 +1,7 @@
use {Bitset, Mask, Register};
use core::marker;
/// An 8-bit timer.
/// A 8-bit timer.
pub trait Timer8 {
/// The first compare register.
/// For example, OCR0A.
@ -177,6 +177,7 @@ impl<T: Timer8> Timer8Setup<T> {
T::CompareA::write(v);
// Enable compare interrupt
// FIXME: is this right?
T::OCIEA.set_all();
}
}

159
src/timer1.rs
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@ -1,159 +0,0 @@
use core::prelude::v1::*;
use core::ptr::write_volatile;
use super::*;
pub enum ClockSource {
None,
Prescale1,
Prescale8,
Prescale64,
Prescale256,
Prescale1024,
ExternalFalling,
ExternalRising,
}
impl ClockSource {
#[inline]
fn bits(&self) -> u8 {
use self::ClockSource::*;
match *self {
None => 0 | 0 | 0,
Prescale1 => 0 | 0 | CS10,
Prescale8 => 0 | CS11 | 0,
Prescale64 => 0 | CS11 | CS10,
Prescale256 => CS12 | 0 | 0,
Prescale1024 => CS12 | 0 | CS10,
ExternalFalling => CS12 | CS11 | 0,
ExternalRising => CS12 | CS11 | CS10,
}
}
#[inline]
fn mask() -> u8 {
!(CS12 | CS11 | CS10)
}
}
pub enum WaveformGenerationMode {
Normal,
PwmPhaseCorrect8Bit,
PwmPhaseCorrect9Bit,
PwmPhaseCorrect10Bit,
ClearOnTimerMatchOutputCompare,
FastPwm8Bit,
FastPwm9Bit,
FastPwm10Bit,
PwmPhaseAndFrequencyCorrectInputCapture,
PwmPhaseAndFrequencyCorrectOutputCompare,
PwmPhaseCorrectInputCapture,
PwmPhaseCorrectOutputCompare,
ClearOnTimerMatchInputCapture,
FastPwmInputCapture,
FastPwmOutputCompare,
}
impl WaveformGenerationMode {
/// Returns bits for TCCR1A, TCCR1B
#[inline]
fn bits(&self) -> (u8, u8) {
use self::WaveformGenerationMode::*;
// It makes more sense to return bytes (A,B), but the manual
// lists the table as (B,A). We match the manual here for
// inspection purposes and flip the values for sanity
// purposes.
let (b, a) = match *self {
Normal => ( 0 | 0, 0 | 0),
PwmPhaseCorrect8Bit => ( 0 | 0, 0 | WGM10),
PwmPhaseCorrect9Bit => ( 0 | 0, WGM11 | 0),
PwmPhaseCorrect10Bit => ( 0 | 0, WGM11 | WGM10),
ClearOnTimerMatchOutputCompare => ( 0 | WGM12, 0 | 0),
FastPwm8Bit => ( 0 | WGM12, 0 | WGM10),
FastPwm9Bit => ( 0 | WGM12, WGM11 | 0),
FastPwm10Bit => ( 0 | WGM12, WGM11 | WGM10),
PwmPhaseAndFrequencyCorrectInputCapture => (WGM13 | 0, 0 | 0),
PwmPhaseAndFrequencyCorrectOutputCompare => (WGM13 | 0, 0 | WGM10),
PwmPhaseCorrectInputCapture => (WGM13 | 0, WGM11 | 0),
PwmPhaseCorrectOutputCompare => (WGM13 | 0, WGM11 | WGM10),
ClearOnTimerMatchInputCapture => (WGM13 | WGM12, 0 | 0),
// Reserved => (WGM13 | WGM12, 0 | WGM10),
FastPwmInputCapture => (WGM13 | WGM12, WGM11 | 0),
FastPwmOutputCompare => (WGM13 | WGM12, WGM11 | WGM10),
};
(a, b)
}
#[inline]
fn mask() -> (u8, u8) {
(!(WGM10 | WGM11), !(WGM12 | WGM13))
}
}
pub struct Timer {
a: u8,
b: u8,
c: u8,
output_compare_1: Option<u16>,
}
impl Timer {
#[inline]
pub fn new() -> Self {
Timer {
a: 0,
b: 0,
c: 0,
output_compare_1: None,
}
}
#[inline]
pub fn clock_source(mut self, source: ClockSource) -> Self {
self.b &= ClockSource::mask();
self.b |= source.bits();
self
}
#[inline]
pub fn waveform_generation_mode(mut self, mode: WaveformGenerationMode) -> Self {
let (a, b) = WaveformGenerationMode::mask();
self.a &= a;
self.b &= b;
let (a, b) = mode.bits();
self.a |= a;
self.b |= b;
self
}
#[inline]
pub fn output_compare_1(mut self, value: Option<u16>) -> Self {
self.output_compare_1 = value;
self
}
#[inline]
pub fn configure(self) {
unsafe {
write_volatile(TCCR1A, self.a);
write_volatile(TCCR1B, self.b);
write_volatile(TCCR1C, self.c);
// Reset counter to zero
write_volatile(TCNT1, 0);
if let Some(v) = self.output_compare_1 {
// Set the match
write_volatile(OCR1A, v);
// Enable compare interrupt
write_volatile(TIMSK1, OCIE1A);
}
}
}
}