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#![allow(non_snake_case, non_upper_case_globals)]
#![allow(non_camel_case_types)]
//! Universal serial bus full-speed device interface
//!
//! Used by: stm32f101, stm32f102, stm32f103, stm32f107
#[cfg(not(feature = "nosync"))]
pub use crate::stm32f1::peripherals::usb::Instance;
pub use crate::stm32f1::peripherals::usb::{RegisterBlock, ResetValues};
pub use crate::stm32f1::peripherals::usb::{
BTABLE, CNTR, DADDR, EP0R, EP1R, EP2R, EP3R, EP4R, EP5R, EP6R, EP7R, FNR, ISTR,
};
/// Access functions for the USB peripheral instance
pub mod USB {
use super::ResetValues;
#[cfg(not(feature = "nosync"))]
use super::Instance;
#[cfg(not(feature = "nosync"))]
const INSTANCE: Instance = Instance {
addr: 0x40005c00,
_marker: ::core::marker::PhantomData,
};
/// Reset values for each field in USB
pub const reset: ResetValues = ResetValues {
EP0R: 0x00000000,
EP1R: 0x00000000,
EP2R: 0x00000000,
EP3R: 0x00000000,
EP4R: 0x00000000,
EP5R: 0x00000000,
EP6R: 0x00000000,
EP7R: 0x00000000,
CNTR: 0x00000003,
ISTR: 0x00000000,
FNR: 0x00000000,
DADDR: 0x00000000,
BTABLE: 0x00000000,
};
#[cfg(not(feature = "nosync"))]
#[allow(renamed_and_removed_lints)]
#[allow(private_no_mangle_statics)]
#[no_mangle]
static mut USB_TAKEN: bool = false;
/// Safe access to USB
///
/// 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 USB_TAKEN {
None
} else {
USB_TAKEN = true;
Some(INSTANCE)
}
})
}
/// Release exclusive access to USB
///
/// 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 USB_TAKEN && inst.addr == INSTANCE.addr {
USB_TAKEN = false;
} else {
panic!("Released a peripheral which was not taken");
}
});
}
/// Unsafely steal USB
///
/// 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 {
USB_TAKEN = true;
INSTANCE
}
}
/// Raw pointer to USB
///
/// 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 USB: *const RegisterBlock = 0x40005c00 as *const _;