From 5a38cc214079aed4c8778bd210c1ece2fe64fdf7 Mon Sep 17 00:00:00 2001
From: Ben Gamari <ben@smart-cactus.org>
Date: Tue, 28 Sep 2021 20:56:19 -0400
Subject: [PATCH] stm32/dac: Ensure that clock is enabled

---
 embassy-stm32/src/dac/v2.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/embassy-stm32/src/dac/v2.rs b/embassy-stm32/src/dac/v2.rs
index f46145b8d..55a881d89 100644
--- a/embassy-stm32/src/dac/v2.rs
+++ b/embassy-stm32/src/dac/v2.rs
@@ -5,6 +5,17 @@ use core::marker::PhantomData;
 use embassy::util::Unborrow;
 use embassy_hal_common::unborrow;
 
+/// Sadly we cannot use `RccPeripheral::enable` since devices are quite inconsistent DAC clock
+/// configuration.
+unsafe fn enable() {
+    #[cfg(rcc_h7)]
+    crate::pac::RCC.apb1lenr().modify(|w| w.set_dac12en(true));
+    #[cfg(rcc_g0)]
+    crate::pac::RCC.apbenr1().modify(|w| w.set_dac1en(true));
+    #[cfg(rcc_l4)]
+    crate::pac::RCC.apb1enr1().modify(|w| w.set_dac1en(true));
+}
+
 #[derive(Debug)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Error {
@@ -91,6 +102,10 @@ impl<'d, T: Instance> Dac<'d, T> {
     ) -> Self {
         unborrow!(ch1, ch2);
 
+        unsafe {
+            enable();
+        }
+
         let ch1 = ch1.degrade_optional();
         if ch1.is_some() {
             unsafe {