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#![allow(non_snake_case, non_upper_case_globals)]
#![allow(non_camel_case_types)]
//! Universal synchronous asynchronous receiver transmitter
//!
//! Used by: stm32g071, stm32g07x, stm32g081
#[cfg(not(feature = "nosync"))]
pub use crate::stm32g0::peripherals::lpuart_v2::Instance;
pub use crate::stm32g0::peripherals::lpuart_v2::{RegisterBlock, ResetValues};
pub use crate::stm32g0::peripherals::lpuart_v2::{
BRR, CR1, CR2, CR3, HWCFGR1, HWCFGR2, ICR, IPIDR, ISR, PRESC, RDR, RQR, SIDR, TDR, VERR,
};
/// Access functions for the LPUART peripheral instance
pub mod LPUART {
use super::ResetValues;
#[cfg(not(feature = "nosync"))]
use super::Instance;
#[cfg(not(feature = "nosync"))]
const INSTANCE: Instance = Instance {
addr: 0x40008000,
_marker: ::core::marker::PhantomData,
};
/// Reset values for each field in LPUART
pub const reset: ResetValues = ResetValues {
CR1: 0x00000000,
CR2: 0x00000000,
CR3: 0x00000000,
BRR: 0x00000000,
RQR: 0x00000000,
ISR: 0x000000C0,
ICR: 0x00000000,
RDR: 0x00000000,
TDR: 0x00000000,
PRESC: 0x00000000,
HWCFGR2: 0x00000013,
HWCFGR1: 0x31100000,
VERR: 0x00000023,
IPIDR: 0x00130003,
SIDR: 0xA3C5DD01,
};
#[cfg(not(feature = "nosync"))]
#[allow(renamed_and_removed_lints)]
#[allow(private_no_mangle_statics)]
#[no_mangle]
static mut LPUART_TAKEN: bool = false;
/// Safe access to LPUART
///
/// 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 LPUART_TAKEN {
None
} else {
LPUART_TAKEN = true;
Some(INSTANCE)
}
})
}
/// Release exclusive access to LPUART
///
/// 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 LPUART_TAKEN && inst.addr == INSTANCE.addr {
LPUART_TAKEN = false;
} else {
panic!("Released a peripheral which was not taken");
}
});
}
/// Unsafely steal LPUART
///
/// 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 {
LPUART_TAKEN = true;
INSTANCE
}
}
/// Raw pointer to LPUART
///
/// 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 LPUART: *const RegisterBlock = 0x40008000 as *const _;