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Merge pull request #3021 from mat-kie/follower-opamp

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Make OpAmp usable in follower configuration for internal DAC channel
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Dario Nieuwenhuis 2024-05-30 12:23:53 +00:00 committed by GitHub
commit d21e9caa80
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1 changed files with 26 additions and 0 deletions
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26
embassy-stm32/src/opamp.rs
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@ -110,6 +110,32 @@ impl<'d, T: Instance> OpAmp<'d, T> {
OpAmpOutput { _inner: self }
}
/// Configure the OpAmp as a buffer for the DAC it is connected to,
/// outputting to the provided output pin, and enable the opamp.
///
/// The output pin is held within the returned [`OpAmpOutput`] struct,
/// preventing it being used elsewhere. The `OpAmpOutput` can then be
/// directly used as an ADC input. The opamp will be disabled when the
/// [`OpAmpOutput`] is dropped.
#[cfg(opamp_g4)]
pub fn buffer_dac(
&'d mut self,
out_pin: impl Peripheral<P = impl OutputPin<T> + crate::gpio::Pin> + 'd,
) -> OpAmpOutput<'d, T> {
into_ref!(out_pin);
out_pin.set_as_analog();
T::regs().csr().modify(|w| {
use crate::pac::opamp::vals::*;
w.set_vm_sel(VmSel::OUTPUT);
w.set_vp_sel(VpSel::DAC3_CH1);
w.set_opaintoen(Opaintoen::OUTPUTPIN);
w.set_opampen(true);
});
OpAmpOutput { _inner: self }
}
/// Configure the OpAmp as a buffer for the provided input pin,
/// with the output only used internally, and enable the opamp.