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Bitfield fixes (#146)

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* Fix incorrect bit for `chained_counting` field in TimerControl.

* Fixes incorrect bitfield manipulation math in mmio_types.
This commit is contained in:
Alissa Rao 2021-05-17 10:50:42 -07:00 • committed by GitHub
parent 127f31ecf2
commit 093edc703f
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 6 additions and 6 deletions
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10
src/mmio_types.rs
View file

@ -15,13 +15,13 @@ macro_rules! bitfield_int {
($inner:ty; $low:literal ..= $high:literal : $nt:ident, $get:ident, $with:ident, $set:ident) => {
#[inline]
pub const fn $get(self) -> $nt {
const MASK: $inner = ((1 << $high) - 1) << $low;
const MASK: $inner = ((1 << ($high - $low + 1)) - 1) << $low;
((self.0 & MASK) >> $low) as $nt
}
#[inline]
pub const fn $with(self, $get: $nt) -> Self {
const MASK: $inner = ((1 << $high) - 1) << $low;
Self(self.0 ^ ((self.0 ^ ($get as $inner)) & MASK))
const MASK: $inner = ((1 << ($high - $low + 1)) - 1) << $low;
Self(self.0 ^ ((self.0 ^ (($get as $inner) << $low)) & MASK))
}
#[inline]
pub fn $set(&mut self, $get: $nt) {
@ -36,12 +36,12 @@ macro_rules! bitfield_newtype {
($inner:ty; $low:literal ..= $high:literal : $nt:ident, $get:ident, $with:ident, $set:ident) => {
#[inline]
pub const fn $get(self) -> $nt {
const MASK: $inner = ((1 << $high) - 1) << $low;
const MASK: $inner = ((1 << ($high - $low + 1)) - 1) << $low;
$nt(self.0 & MASK)
}
#[inline]
pub const fn $with(self, $get: $nt) -> Self {
const MASK: $inner = ((1 << $high) - 1) << $low;
const MASK: $inner = ((1 << ($high - $low + 1)) - 1) << $low;
Self(self.0 ^ ((self.0 ^ $get.0) & MASK))
}
#[inline]

2
src/mmio_types/timer_control.rs
View file

@ -6,7 +6,7 @@ pub struct TimerControl(u8);
impl TimerControl {
const_new!();
bitfield_int!(u8; 0..=1: u8, prescaler_selection, with_prescaler_selection, set_prescaler_selection);
bitfield_bool!(u8; 4, chained_counting, with_chained_counting, set_chained_counting);
bitfield_bool!(u8; 2, chained_counting, with_chained_counting, set_chained_counting);
bitfield_bool!(u8; 6, irq_on_overflow, with_irq_on_overflow, set_irq_on_overflow);
bitfield_bool!(u8; 7, enabled, with_enabled, set_enabled);
}