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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,169 @@ | ||
| /// This structure provides unsafe volatile access to registers. | ||
| pub struct Reg<REG: RegisterSpec> { | ||
| _marker: marker::PhantomData<REG>, | ||
| } | ||
|
|
||
| unsafe impl<REG: RegisterSpec> Send for Reg<REG> where REG::Ux: Send {} | ||
|
|
||
| impl<REG: RegisterSpec> Reg<REG> { | ||
| /// Returns the underlying memory address of register. | ||
| /// | ||
| /// ```ignore | ||
| /// let reg_ptr = periph.reg.as_ptr(); | ||
| /// ``` | ||
| #[inline(always)] | ||
| pub fn as_ptr(&self) -> *mut REG::Ux { | ||
| (self as *const Self).cast_mut().cast() | ||
| } | ||
| } | ||
|
|
||
| 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, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| 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) | ||
| } | ||
|
|
||
| /// 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, | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| 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, | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| 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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