1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
#![allow(non_snake_case, non_upper_case_globals)]
#![allow(non_camel_case_types)]
//! System control block
//!
//! Used by: stm32f100, stm32f101, stm32f102, stm32f103, stm32f107
#[cfg(not(feature = "nosync"))]
pub use crate::stm32f1::peripherals::scb::Instance;
pub use crate::stm32f1::peripherals::scb::{RegisterBlock, ResetValues};
pub use crate::stm32f1::peripherals::scb::{
AIRCR, BFAR, CCR, CFSR_UFSR_BFSR_MMFSR, CPUID, HFSR, ICSR, MMFAR, SCR, SHCRS, SHPR1, SHPR2,
SHPR3, VTOR,
};
/// Access functions for the SCB peripheral instance
pub mod SCB {
use super::ResetValues;
#[cfg(not(feature = "nosync"))]
use super::Instance;
#[cfg(not(feature = "nosync"))]
const INSTANCE: Instance = Instance {
addr: 0xe000ed00,
_marker: ::core::marker::PhantomData,
};
/// Reset values for each field in SCB
pub const reset: ResetValues = ResetValues {
CPUID: 0x410FC241,
ICSR: 0x00000000,
VTOR: 0x00000000,
AIRCR: 0x00000000,
SCR: 0x00000000,
CCR: 0x00000000,
SHPR1: 0x00000000,
SHPR2: 0x00000000,
SHPR3: 0x00000000,
SHCRS: 0x00000000,
CFSR_UFSR_BFSR_MMFSR: 0x00000000,
HFSR: 0x00000000,
MMFAR: 0x00000000,
BFAR: 0x00000000,
};
#[cfg(not(feature = "nosync"))]
#[allow(renamed_and_removed_lints)]
#[allow(private_no_mangle_statics)]
#[no_mangle]
static mut SCB_TAKEN: bool = false;
/// Safe access to SCB
///
/// 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 SCB_TAKEN {
None
} else {
SCB_TAKEN = true;
Some(INSTANCE)
}
})
}
/// Release exclusive access to SCB
///
/// 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 SCB_TAKEN && inst.addr == INSTANCE.addr {
SCB_TAKEN = false;
} else {
panic!("Released a peripheral which was not taken");
}
});
}
/// Unsafely steal SCB
///
/// 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 {
SCB_TAKEN = true;
INSTANCE
}
}
/// Raw pointer to SCB
///
/// 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 SCB: *const RegisterBlock = 0xe000ed00 as *const _;