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#![allow(non_snake_case, non_upper_case_globals)]
#![allow(non_camel_case_types)]
//! Floating point unit CPACR
use crate::RWRegister;
#[cfg(not(feature = "nosync"))]
use core::marker::PhantomData;
/// Coprocessor access control register
pub mod CPACR {
/// CP
pub mod CP {
/// Offset (20 bits)
pub const offset: u32 = 20;
/// Mask (4 bits: 0b1111 << 20)
pub const mask: u32 = 0b1111 << offset;
/// Read-only values (empty)
pub mod R {}
/// Write-only values (empty)
pub mod W {}
/// Read-write values (empty)
pub mod RW {}
}
}
#[repr(C)]
pub struct RegisterBlock {
/// Coprocessor access control register
pub CPACR: RWRegister<u32>,
}
pub struct ResetValues {
pub CPACR: u32,
}
#[cfg(not(feature = "nosync"))]
pub struct Instance {
pub(crate) addr: u32,
pub(crate) _marker: PhantomData<*const RegisterBlock>,
}
#[cfg(not(feature = "nosync"))]
impl ::core::ops::Deref for Instance {
type Target = RegisterBlock;
#[inline(always)]
fn deref(&self) -> &RegisterBlock {
unsafe { &*(self.addr as *const _) }
}
}
#[cfg(feature = "rtic")]
unsafe impl Send for Instance {}
/// Access functions for the FPU_CPACR peripheral instance
pub mod FPU_CPACR {
use super::ResetValues;
#[cfg(not(feature = "nosync"))]
use super::Instance;
#[cfg(not(feature = "nosync"))]
const INSTANCE: Instance = Instance {
addr: 0xe000ed88,
_marker: ::core::marker::PhantomData,
};
/// Reset values for each field in FPU_CPACR
pub const reset: ResetValues = ResetValues { CPACR: 0x00000000 };
#[cfg(not(feature = "nosync"))]
#[allow(renamed_and_removed_lints)]
#[allow(private_no_mangle_statics)]
#[no_mangle]
static mut FPU_CPACR_TAKEN: bool = false;
/// Safe access to FPU_CPACR
///
/// This function returns `Some(Instance)` if this instance is not
/// currently taken, and `None` if it is. This ensures that if you
/// do get `Some(Instance)`, you are ensured unique access to
/// the peripheral and there cannot be data races (unless other
/// code uses `unsafe`, of course). You can then pass the
/// `Instance` around to other functions as required. When you're
/// done with it, you can call `release(instance)` to return it.
///
/// `Instance` itself dereferences to a `RegisterBlock`, which
/// provides access to the peripheral's registers.
#[cfg(not(feature = "nosync"))]
#[inline]
pub fn take() -> Option<Instance> {
external_cortex_m::interrupt::free(|_| unsafe {
if FPU_CPACR_TAKEN {
None
} else {
FPU_CPACR_TAKEN = true;
Some(INSTANCE)
}
})
}
/// Release exclusive access to FPU_CPACR
///
/// This function allows you to return an `Instance` so that it
/// is available to `take()` again. This function will panic if
/// you return a different `Instance` or if this instance is not
/// already taken.
#[cfg(not(feature = "nosync"))]
#[inline]
pub fn release(inst: Instance) {
external_cortex_m::interrupt::free(|_| unsafe {
if FPU_CPACR_TAKEN && inst.addr == INSTANCE.addr {
FPU_CPACR_TAKEN = false;
} else {
panic!("Released a peripheral which was not taken");
}
});
}
/// Unsafely steal FPU_CPACR
///
/// This function is similar to take() but forcibly takes the
/// Instance, marking it as taken irregardless of its previous
/// state.
#[cfg(not(feature = "nosync"))]
#[inline]
pub unsafe fn steal() -> Instance {
FPU_CPACR_TAKEN = true;
INSTANCE
}
}
/// Raw pointer to FPU_CPACR
///
/// Dereferencing this is unsafe because you are not ensured unique
/// access to the peripheral, so you may encounter data races with
/// other users of this peripheral. It is up to you to ensure you
/// will not cause data races.
///
/// This constant is provided for ease of use in unsafe code: you can
/// simply call for example `write_reg!(gpio, GPIOA, ODR, 1);`.
pub const FPU_CPACR: *const RegisterBlock = 0xe000ed88 as *const _;