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//! Voltage Reference Buffer (VREFBUF)
use core::marker::PhantomData;
use embassy_hal_internal::PeripheralType;
use stm32_metapac::vrefbuf::vals::*;
use crate::Peri;
/// Voltage Reference (VREFBUF) driver.
pub struct VoltageReferenceBuffer<'d, T: Instance> {
vrefbuf: PhantomData<&'d mut T>,
}
#[cfg(rcc_wba)]
fn get_refbuf_trim(voltage_scale: Vrs) -> usize {
match voltage_scale {
Vrs::VREF0 => 0x0BFA_07A8usize,
Vrs::VREF1 => 0x0BFA_07A9usize,
Vrs::VREF2 => 0x0BFA_07AAusize,
Vrs::VREF3 => 0x0BFA_07ABusize,
_ => panic!("Incorrect Vrs setting!"),
}
}
impl<'d, T: Instance> VoltageReferenceBuffer<'d, T> {
/// Creates an VREFBUF (Voltage Reference) instance with a voltage scale and impedance mode.
///
/// [Self] has to be started with [Self::new()].
pub fn new(_instance: Peri<'d, T>, voltage_scale: Vrs, impedance_mode: Hiz) -> Self {
#[cfg(rcc_wba)]
{
use crate::pac::RCC;
RCC.apb7enr().modify(|w| w.set_vrefen(true));
// This is an errata for WBA6 devices. VREFBUF_TRIM value isn't set correctly
// [Link explaining it](https://www.st.com/resource/en/errata_sheet/es0644-stm32wba6xxx-device-errata-stmicroelectronics.pdf)
unsafe {
use crate::pac::VREFBUF;
let addr = get_refbuf_trim(voltage_scale);
let buf_trim_ptr = core::ptr::with_exposed_provenance::<u32>(addr);
let trim_val = core::ptr::read_volatile(buf_trim_ptr);
VREFBUF.ccr().write(|w| w.set_trim((trim_val & 0x3F) as u8));
}
}
#[cfg(any(rcc_u5, rcc_h50, rcc_h5))]
{
use crate::pac::RCC;
RCC.apb3enr().modify(|w| w.set_vrefen(true));
}
#[cfg(any(rcc_h7rs, rcc_h7rm0433, rcc_h7ab, rcc_h7))]
{
use crate::pac::RCC;
RCC.apb4enr().modify(|w| w.set_vrefen(true));
}
let vrefbuf = T::regs();
vrefbuf.csr().modify(|w| {
w.set_hiz(impedance_mode);
w.set_envr(true);
w.set_vrs(voltage_scale);
});
while vrefbuf.csr().read().vrr() != false {
// wait...
}
trace!(
"Vrefbuf configured with voltage scale {} and impedance mode {}",
voltage_scale as u8, impedance_mode as u8,
);
VoltageReferenceBuffer { vrefbuf: PhantomData }
}
}
trait SealedInstance {
fn regs() -> crate::pac::vrefbuf::Vrefbuf;
}
/// VREFBUF instance trait.
#[allow(private_bounds)]
pub trait Instance: SealedInstance + PeripheralType {}
foreach_peripheral!(
(vrefbuf, $inst:ident) => {
impl SealedInstance for crate::peripherals::$inst {
fn regs() -> crate::pac::vrefbuf::Vrefbuf {
crate::pac::$inst
}
}
impl Instance for crate::peripherals::$inst {}
};
);
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