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Provide a way for a peripheral to query its clock frequency

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Currently this looks up the frequency in the global singleton that must
be initialized by the per-chip RCC implementation. At present, this is
only done for the L0 family of chips.
This commit is contained in:
Ulf Lilleengen
2021-06-11 09:19:02 +02:00
parent 85f172dd93
commit 952f525af5
6 changed files with 44 additions and 28 deletions
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23
embassy-stm32/src/rcc/mod.rs
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@ -9,14 +9,10 @@ use core::mem::MaybeUninit;
/// The existence of this value indicates that the clock configuration can no longer be changed
#[derive(Clone, Copy)]
pub struct Clocks {
pub sys_clk: Hertz,
pub ahb_clk: Hertz,
pub apb1_clk: Hertz,
pub apb1_tim_clk: Hertz,
pub apb2_clk: Hertz,
pub apb2_tim_clk: Hertz,
pub apb1_pre: u8,
pub apb2_pre: u8,
pub sys: Hertz,
pub ahb: Hertz,
pub apb1: Hertz,
pub apb2: Hertz,
}
static mut CLOCK_FREQS: MaybeUninit<Clocks> = MaybeUninit::uninit();
@ -50,6 +46,7 @@ cfg_if::cfg_if! {
pub(crate) mod sealed {
pub trait RccPeripheral {
fn frequency() -> crate::time::Hertz;
fn reset();
fn enable();
fn disable();
@ -59,8 +56,16 @@ pub(crate) mod sealed {
pub trait RccPeripheral: sealed::RccPeripheral + 'static {}
crate::pac::peripheral_rcc!(
($inst:ident, $enable:ident, $reset:ident, $perien:ident, $perirst:ident) => {
($inst:ident, $clk:ident, $enable:ident, $reset:ident, $perien:ident, $perirst:ident) => {
impl sealed::RccPeripheral for peripherals::$inst {
fn frequency() -> crate::time::Hertz {
critical_section::with(|_| {
unsafe {
let freqs = get_freqs();
freqs.$clk
}
})
}
fn enable() {
critical_section::with(|_| {
unsafe {