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/// This structure provides unsafe volatile access to registers. | ||
pub struct Reg<REG: RegisterSpec> { | ||
ptr: *mut u8, | ||
_marker: marker::PhantomData<REG>, | ||
} | ||
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unsafe impl<REG: RegisterSpec> Send for Reg<REG> where REG::Ux: Send {} | ||
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impl<REG: RegisterSpec> Reg<REG> { | ||
#[inline(always)] | ||
pub const fn new(ptr: *mut u8) -> Self { | ||
Self { | ||
ptr, | ||
_marker: marker::PhantomData, | ||
} | ||
} | ||
/// Returns the underlying memory address of register. | ||
/// | ||
/// ```ignore | ||
/// let reg_ptr = periph.reg.as_ptr(); | ||
/// ``` | ||
#[inline(always)] | ||
pub const fn as_ptr(&self) -> *mut REG::Ux { | ||
self.ptr.cast() | ||
} | ||
} | ||
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impl<REG: Readable> Reg<REG> { | ||
/// Reads the contents of a `Readable` register. | ||
/// | ||
/// You can read the raw contents of a register by using `bits`: | ||
/// ```ignore | ||
/// let bits = periph.reg.read().bits(); | ||
/// ``` | ||
/// or get the content of a particular field of a register: | ||
/// ```ignore | ||
/// let reader = periph.reg.read(); | ||
/// let bits = reader.field1().bits(); | ||
/// let flag = reader.field2().bit_is_set(); | ||
/// ``` | ||
#[inline(always)] | ||
pub unsafe fn read(&self) -> R<REG> { | ||
R { | ||
bits: self.as_ptr().read_volatile(), | ||
_reg: marker::PhantomData, | ||
} | ||
} | ||
} | ||
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impl<REG: Resettable + Writable> Reg<REG> { | ||
/// Writes the reset value to `Writable` register. | ||
/// | ||
/// Resets the register to its initial state. | ||
#[inline(always)] | ||
pub unsafe fn reset(&self) { | ||
self.as_ptr().write_volatile(REG::RESET_VALUE) | ||
} | ||
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/// Writes bits to a `Writable` register. | ||
/// | ||
/// You can write raw bits into a register: | ||
/// ```ignore | ||
/// periph.reg.write(|w| unsafe { w.bits(rawbits) }); | ||
/// ``` | ||
/// or write only the fields you need: | ||
/// ```ignore | ||
/// periph.reg.write(|w| w | ||
/// .field1().bits(newfield1bits) | ||
/// .field2().set_bit() | ||
/// .field3().variant(VARIANT) | ||
/// ); | ||
/// ``` | ||
/// or an alternative way of saying the same: | ||
/// ```ignore | ||
/// periph.reg.write(|w| { | ||
/// w.field1().bits(newfield1bits); | ||
/// w.field2().set_bit(); | ||
/// w.field3().variant(VARIANT) | ||
/// }); | ||
/// ``` | ||
/// In the latter case, other fields will be set to their reset value. | ||
#[inline(always)] | ||
pub unsafe fn write<F>(&self, f: F) | ||
where | ||
F: FnOnce(&mut W<REG>) -> &mut W<REG>, | ||
{ | ||
self.as_ptr().write_volatile( | ||
f(&mut W { | ||
bits: REG::RESET_VALUE & !REG::ONE_TO_MODIFY_FIELDS_BITMAP | ||
| REG::ZERO_TO_MODIFY_FIELDS_BITMAP, | ||
_reg: marker::PhantomData, | ||
}) | ||
.bits, | ||
); | ||
} | ||
} | ||
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impl<REG: Writable> Reg<REG> { | ||
/// Writes 0 to a `Writable` register. | ||
/// | ||
/// Similar to `write`, but unused bits will contain 0. | ||
/// | ||
/// # Safety | ||
/// | ||
/// Unsafe to use with registers which don't allow to write 0. | ||
#[inline(always)] | ||
pub unsafe fn write_with_zero<F>(&self, f: F) | ||
where | ||
F: FnOnce(&mut W<REG>) -> &mut W<REG>, | ||
{ | ||
self.as_ptr().write_volatile( | ||
f(&mut W { | ||
bits: REG::Ux::default(), | ||
_reg: marker::PhantomData, | ||
}) | ||
.bits, | ||
); | ||
} | ||
} | ||
|
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impl<REG: Readable + Writable> Reg<REG> { | ||
/// Modifies the contents of the register by reading and then writing it. | ||
/// | ||
/// E.g. to do a read-modify-write sequence to change parts of a register: | ||
/// ```ignore | ||
/// periph.reg.modify(|r, w| unsafe { w.bits( | ||
/// r.bits() | 3 | ||
/// ) }); | ||
/// ``` | ||
/// or | ||
/// ```ignore | ||
/// periph.reg.modify(|_, w| w | ||
/// .field1().bits(newfield1bits) | ||
/// .field2().set_bit() | ||
/// .field3().variant(VARIANT) | ||
/// ); | ||
/// ``` | ||
/// or an alternative way of saying the same: | ||
/// ```ignore | ||
/// periph.reg.modify(|_, w| { | ||
/// w.field1().bits(newfield1bits); | ||
/// w.field2().set_bit(); | ||
/// w.field3().variant(VARIANT) | ||
/// }); | ||
/// ``` | ||
/// Other fields will have the value they had before the call to `modify`. | ||
#[inline(always)] | ||
pub unsafe fn modify<F>(&self, f: F) | ||
where | ||
for<'w> F: FnOnce(&R<REG>, &'w mut W<REG>) -> &'w mut W<REG>, | ||
{ | ||
let bits = self.as_ptr().read_volatile(); | ||
self.as_ptr().write_volatile( | ||
f( | ||
&R { | ||
bits, | ||
_reg: marker::PhantomData, | ||
}, | ||
&mut W { | ||
bits: bits & !REG::ONE_TO_MODIFY_FIELDS_BITMAP | ||
| REG::ZERO_TO_MODIFY_FIELDS_BITMAP, | ||
_reg: marker::PhantomData, | ||
}, | ||
) | ||
.bits, | ||
); | ||
} | ||
} | ||
|
||
impl<REG: Readable> core::fmt::Debug for crate::generic::Reg<REG> | ||
where | ||
R<REG>: core::fmt::Debug, | ||
{ | ||
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result { | ||
unsafe { core::fmt::Debug::fmt(&self.read(), f) } | ||
} | ||
} |
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