diff --git a/embassy-stm32/Cargo.toml b/embassy-stm32/Cargo.toml
index d43252ad..1b688eca 100644
--- a/embassy-stm32/Cargo.toml
+++ b/embassy-stm32/Cargo.toml
@@ -59,7 +59,7 @@ sdio-host = "0.5.0"
 embedded-sdmmc = { git = "https://github.com/embassy-rs/embedded-sdmmc-rs", rev = "a4f293d3a6f72158385f79c98634cb8a14d0d2fc", optional = true }
 critical-section = "1.1"
 atomic-polyfill = "1.0.1"
-stm32-metapac = { git = "https://github.com/embassy-rs/stm32-data-generated", tag = "stm32-data-06d13dfd245cc9bf86fd88c35b401bdb84c079c4" }
+stm32-metapac = { git = "https://github.com/embassy-rs/stm32-data-generated", tag = "stm32-data-172c5ea18824d7cd38decb210e4af441fa3816cb" }
 vcell = "0.1.3"
 bxcan = "0.7.0"
 nb = "1.0.0"
@@ -78,7 +78,7 @@ critical-section = { version = "1.1", features = ["std"] }
 [build-dependencies]
 proc-macro2 = "1.0.36"
 quote = "1.0.15"
-stm32-metapac = { git = "https://github.com/embassy-rs/stm32-data-generated", tag = "stm32-data-06d13dfd245cc9bf86fd88c35b401bdb84c079c4", default-features = false, features = ["metadata"]}
+stm32-metapac = { git = "https://github.com/embassy-rs/stm32-data-generated", tag = "stm32-data-172c5ea18824d7cd38decb210e4af441fa3816cb", default-features = false, features = ["metadata"]}
 
 
 [features]
diff --git a/embassy-stm32/src/opamp.rs b/embassy-stm32/src/opamp.rs
index 7b388aef..e0fad26e 100644
--- a/embassy-stm32/src/opamp.rs
+++ b/embassy-stm32/src/opamp.rs
@@ -4,7 +4,15 @@ use embassy_hal_internal::{into_ref, PeripheralRef};
 
 use crate::Peripheral;
 
-#[cfg(opamp_f3)]
+#[derive(Clone, Copy)]
+pub enum OpAmpGain {
+    Mul1,
+    Mul2,
+    Mul4,
+    Mul8,
+    Mul16,
+}
+
 pub struct OpAmpOutput<'d, 'p, T: Instance, P: NonInvertingPin<T>> {
     _inner: &'d OpAmp<'d, T>,
     _input: &'p mut P,
@@ -35,14 +43,32 @@ impl<'d, T: Instance> OpAmp<'d, T> {
         Self { _inner: opamp }
     }
 
-    #[cfg(opamp_f3)]
-    pub fn buffer_for<'a, 'b, P>(&'a mut self, pin: &'b mut P) -> OpAmpOutput<'a, 'b, T, P>
+    pub fn buffer_for<'a, 'b, P>(&'a mut self, pin: &'b mut P, gain: OpAmpGain) -> OpAmpOutput<'a, 'b, T, P>
     where
         P: NonInvertingPin<T>,
     {
+        let (vm_sel, pga_gain) = match gain {
+            OpAmpGain::Mul1 => (0b11, 0b00),
+            OpAmpGain::Mul2 => (0b10, 0b00),
+            OpAmpGain::Mul4 => (0b10, 0b01),
+            OpAmpGain::Mul8 => (0b10, 0b10),
+            OpAmpGain::Mul16 => (0b10, 0b11),
+        };
+
         #[cfg(opamp_f3)]
         T::regs().opampcsr().modify(|w| {
             w.set_vp_sel(pin.channel());
+            w.set_vm_sel(vm_sel);
+            w.set_pga_gain(pga_gain);
+        });
+
+        #[cfg(opamp_g4)]
+        T::regs().opamp_csr().modify(|w| {
+            use crate::pac::opamp::vals::*;
+
+            w.set_vp_sel(OpampCsrVpSel::from_bits(pin.channel()));
+            w.set_vm_sel(OpampCsrVmSel::from_bits(vm_sel));
+            w.set_pga_gain(OpampCsrPgaGain::from_bits(pga_gain));
         });
 
         OpAmpOutput {
diff --git a/examples/stm32f334/src/bin/opamp.rs b/examples/stm32f334/src/bin/opamp.rs
index 72263bab..3fffcfb1 100644
--- a/examples/stm32f334/src/bin/opamp.rs
+++ b/examples/stm32f334/src/bin/opamp.rs
@@ -5,7 +5,7 @@
 use defmt::info;
 use embassy_executor::Spawner;
 use embassy_stm32::adc::{Adc, SampleTime};
-use embassy_stm32::opamp::OpAmp;
+use embassy_stm32::opamp::{OpAmp, OpAmpGain};
 use embassy_stm32::peripherals::ADC2;
 use embassy_stm32::rcc::AdcClockSource;
 use embassy_stm32::time::mhz;
@@ -39,7 +39,7 @@ async fn main(_spawner: Spawner) -> ! {
 
     let mut vrefint = adc.enable_vref(&mut Delay);
     let mut temperature = adc.enable_temperature();
-    let mut buffer = opamp.buffer_for(&mut p.PA7);
+    let mut buffer = opamp.buffer_for(&mut p.PA7, OpAmpGain::Mul1);
 
     loop {
         let vref = adc.read(&mut vrefint).await;