From 28f5f0babaa6348c08985f599353e34b48c887fb Mon Sep 17 00:00:00 2001
From: Mattis Kieffer <mattis.kieffer@hotmail.de>
Date: Thu, 30 May 2024 14:07:47 +0200
Subject: [PATCH] add dac buffer function
---
embassy-stm32/src/opamp.rs | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/embassy-stm32/src/opamp.rs b/embassy-stm32/src/opamp.rs
index 487902959..ca94a573d 100644
--- a/embassy-stm32/src/opamp.rs
+++ b/embassy-stm32/src/opamp.rs
@@ -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.