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use core::marker; #[doc = " Raw register type"] pub trait RegisterSpec { #[doc = " Raw register type (`u8`, `u16`, `u32`, ...)."] type Ux: Copy; } #[doc = " Trait implemented by readable registers to enable the `read` method."] #[doc = ""] #[doc = " Registers marked with `Writable` can be also `modify`'ed."] pub trait Readable: RegisterSpec { #[doc = " Result from a call to `read` and argument to `modify`."] type Reader: core::convert::From<R<Self>> + core::ops::Deref<Target = R<Self>>; } #[doc = " Trait implemented by writeable registers."] #[doc = ""] #[doc = " This enables the `write`, `write_with_zero` and `reset` methods."] #[doc = ""] #[doc = " Registers marked with `Readable` can be also `modify`'ed."] pub trait Writable: RegisterSpec { #[doc = " Writer type argument to `write`, et al."] type Writer: core::convert::From<W<Self>> + core::ops::DerefMut<Target = W<Self>>; } #[doc = " Reset value of the register."] #[doc = ""] #[doc = " This value is the initial value for the `write` method. It can also be directly written to the"] #[doc = " register by using the `reset` method."] pub trait Resettable: RegisterSpec { #[doc = " Reset value of the register."] fn reset_value() -> Self::Ux; } #[doc = " This structure provides volatile access to registers."] pub struct Reg<REG: RegisterSpec> { register: vcell::VolatileCell<REG::Ux>, _marker: marker::PhantomData<REG>, } unsafe impl<REG: RegisterSpec> Send for Reg<REG> where REG::Ux: Send {} impl<REG: RegisterSpec> Reg<REG> { #[doc = " Returns the underlying memory address of register."] #[doc = ""] #[doc = " ```ignore"] #[doc = " let reg_ptr = periph.reg.as_ptr();"] #[doc = " ```"] #[inline(always)] pub fn as_ptr(&self) -> *mut REG::Ux { self.register.as_ptr() } } impl<REG: Readable> Reg<REG> { #[doc = " Reads the contents of a `Readable` register."] #[doc = ""] #[doc = " You can read the raw contents of a register by using `bits`:"] #[doc = " ```ignore"] #[doc = " let bits = periph.reg.read().bits();"] #[doc = " ```"] #[doc = " or get the content of a particular field of a register:"] #[doc = " ```ignore"] #[doc = " let reader = periph.reg.read();"] #[doc = " let bits = reader.field1().bits();"] #[doc = " let flag = reader.field2().bit_is_set();"] #[doc = " ```"] #[inline(always)] pub fn read(&self) -> REG::Reader { REG::Reader::from(R { bits: self.register.get(), _reg: marker::PhantomData, }) } } impl<REG: Resettable + Writable> Reg<REG> { #[doc = " Writes the reset value to `Writable` register."] #[doc = ""] #[doc = " Resets the register to its initial state."] #[inline(always)] pub fn reset(&self) { self.register.set(REG::reset_value()) } #[doc = " Writes bits to a `Writable` register."] #[doc = ""] #[doc = " You can write raw bits into a register:"] #[doc = " ```ignore"] #[doc = " periph.reg.write(|w| unsafe { w.bits(rawbits) });"] #[doc = " ```"] #[doc = " or write only the fields you need:"] #[doc = " ```ignore"] #[doc = " periph.reg.write(|w| w"] #[doc = " .field1().bits(newfield1bits)"] #[doc = " .field2().set_bit()"] #[doc = " .field3().variant(VARIANT)"] #[doc = " );"] #[doc = " ```"] #[doc = " In the latter case, other fields will be set to their reset value."] #[inline(always)] pub fn write<F>(&self, f: F) where F: FnOnce(&mut REG::Writer) -> &mut W<REG>, { self.register.set( f(&mut REG::Writer::from(W { bits: REG::reset_value(), _reg: marker::PhantomData, })) .bits, ); } } impl<REG: Writable> Reg<REG> where REG::Ux: Default, { #[doc = " Writes 0 to a `Writable` register."] #[doc = ""] #[doc = " Similar to `write`, but unused bits will contain 0."] #[inline(always)] pub fn write_with_zero<F>(&self, f: F) where F: FnOnce(&mut REG::Writer) -> &mut W<REG>, { self.register.set( (*f(&mut REG::Writer::from(W { bits: REG::Ux::default(), _reg: marker::PhantomData, }))) .bits, ); } } impl<REG: Readable + Writable> Reg<REG> { #[doc = " Modifies the contents of the register by reading and then writing it."] #[doc = ""] #[doc = " E.g. to do a read-modify-write sequence to change parts of a register:"] #[doc = " ```ignore"] #[doc = " periph.reg.modify(|r, w| unsafe { w.bits("] #[doc = " r.bits() | 3"] #[doc = " ) });"] #[doc = " ```"] #[doc = " or"] #[doc = " ```ignore"] #[doc = " periph.reg.modify(|_, w| w"] #[doc = " .field1().bits(newfield1bits)"] #[doc = " .field2().set_bit()"] #[doc = " .field3().variant(VARIANT)"] #[doc = " );"] #[doc = " ```"] #[doc = " Other fields will have the value they had before the call to `modify`."] #[inline(always)] pub fn modify<F>(&self, f: F) where for<'w> F: FnOnce(®::Reader, &'w mut REG::Writer) -> &'w mut W<REG>, { let bits = self.register.get(); self.register.set( f( ®::Reader::from(R { bits, _reg: marker::PhantomData, }), &mut REG::Writer::from(W { bits, _reg: marker::PhantomData, }), ) .bits, ); } } #[doc = " Register reader."] #[doc = ""] #[doc = " Result of the `read` methods of registers. Also used as a closure argument in the `modify`"] #[doc = " method."] pub struct R<REG: RegisterSpec + ?Sized> { pub(crate) bits: REG::Ux, _reg: marker::PhantomData<REG>, } impl<REG: RegisterSpec> R<REG> { #[doc = " Reads raw bits from register."] #[inline(always)] pub fn bits(&self) -> REG::Ux { self.bits } } impl<REG: RegisterSpec, FI> PartialEq<FI> for R<REG> where REG::Ux: PartialEq, FI: Copy + Into<REG::Ux>, { #[inline(always)] fn eq(&self, other: &FI) -> bool { self.bits.eq(&(*other).into()) } } #[doc = " Register writer."] #[doc = ""] #[doc = " Used as an argument to the closures in the `write` and `modify` methods of the register."] pub struct W<REG: RegisterSpec + ?Sized> { #[doc = "Writable bits"] pub(crate) bits: REG::Ux, _reg: marker::PhantomData<REG>, } impl<REG: RegisterSpec> W<REG> { #[doc = " Writes raw bits to the register."] #[inline(always)] pub unsafe fn bits(&mut self, bits: REG::Ux) -> &mut Self { self.bits = bits; self } } #[doc = " Used if enumerated values cover not the whole range."] #[derive(Clone, Copy, PartialEq)] pub enum Variant<U, T> { #[doc = " Expected variant."] Val(T), #[doc = " Raw bits."] Res(U), } #[doc = " Field reader."] #[doc = ""] #[doc = " Result of the `read` methods of fields."] pub struct FieldReader<U, T> { pub(crate) bits: U, _reg: marker::PhantomData<T>, } impl<U, T> FieldReader<U, T> where U: Copy, { #[doc = " Creates a new instance of the reader."] #[allow(unused)] #[inline(always)] pub(crate) fn new(bits: U) -> Self { Self { bits, _reg: marker::PhantomData, } } #[doc = " Reads raw bits from field."] #[inline(always)] pub fn bits(&self) -> U { self.bits } } impl<U, T, FI> PartialEq<FI> for FieldReader<U, T> where U: PartialEq, FI: Copy + Into<U>, { #[inline(always)] fn eq(&self, other: &FI) -> bool { self.bits.eq(&(*other).into()) } } impl<FI> FieldReader<bool, FI> { #[doc = " Value of the field as raw bits."] #[inline(always)] pub fn bit(&self) -> bool { self.bits } #[doc = " Returns `true` if the bit is clear (0)."] #[inline(always)] pub fn bit_is_clear(&self) -> bool { !self.bit() } #[doc = " Returns `true` if the bit is set (1)."] #[inline(always)] pub fn bit_is_set(&self) -> bool { self.bit() } }