From 82846d164c3dcb70a493f0f8dc2fb73c25c1fe4e Mon Sep 17 00:00:00 2001
From: Dario Nieuwenhuis <dirbaio@dirbaio.net>
Date: Sat, 20 Feb 2021 01:29:26 +0100
Subject: [PATCH] stm32f4-examples: add workaround for WFI breaking RTT

---
 embassy-stm32f4-examples/src/bin/exti.rs   | 7 +++++++
 embassy-stm32f4-examples/src/bin/hello.rs  | 8 ++++++++
 embassy-stm32f4-examples/src/bin/serial.rs | 7 +++++++
 3 files changed, 22 insertions(+)

diff --git a/embassy-stm32f4-examples/src/bin/exti.rs b/embassy-stm32f4-examples/src/bin/exti.rs
index 79348777..d8de3381 100644
--- a/embassy-stm32f4-examples/src/bin/exti.rs
+++ b/embassy-stm32f4-examples/src/bin/exti.rs
@@ -44,6 +44,13 @@ fn main() -> ! {
     let dp = stm32::Peripherals::take().unwrap();
     let cp = cortex_m::peripheral::Peripherals::take().unwrap();
 
+    dp.DBGMCU.cr.modify(|_, w| {
+        w.dbg_sleep().set_bit();
+        w.dbg_standby().set_bit();
+        w.dbg_stop().set_bit()
+    });
+    dp.RCC.ahb1enr.modify(|_, w| w.dma1en().enabled());
+
     let executor = EXECUTOR.put(Executor::new());
     executor.run(|spawner| {
         unwrap!(spawner.spawn(run(dp, cp)));
diff --git a/embassy-stm32f4-examples/src/bin/hello.rs b/embassy-stm32f4-examples/src/bin/hello.rs
index d6237871..77c54464 100644
--- a/embassy-stm32f4-examples/src/bin/hello.rs
+++ b/embassy-stm32f4-examples/src/bin/hello.rs
@@ -15,6 +15,14 @@ fn main() -> ! {
     info!("Hello World!");
 
     let p = stm32f4xx_hal::stm32::Peripherals::take().unwrap();
+
+    p.DBGMCU.cr.modify(|_, w| {
+        w.dbg_sleep().set_bit();
+        w.dbg_standby().set_bit();
+        w.dbg_stop().set_bit()
+    });
+    p.RCC.ahb1enr.modify(|_, w| w.dma1en().enabled());
+
     let gpioa = p.GPIOA.split();
     let gpioc = p.GPIOC.split();
 
diff --git a/embassy-stm32f4-examples/src/bin/serial.rs b/embassy-stm32f4-examples/src/bin/serial.rs
index f8e7f7f4..2cd1c8c3 100644
--- a/embassy-stm32f4-examples/src/bin/serial.rs
+++ b/embassy-stm32f4-examples/src/bin/serial.rs
@@ -20,6 +20,13 @@ use stm32f4xx_hal::stm32;
 
 #[task]
 async fn run(dp: stm32::Peripherals, _cp: cortex_m::Peripherals) {
+    dp.DBGMCU.cr.modify(|_, w| {
+        w.dbg_sleep().set_bit();
+        w.dbg_standby().set_bit();
+        w.dbg_stop().set_bit()
+    });
+    dp.RCC.ahb1enr.modify(|_, w| w.dma1en().enabled());
+
     // https://gist.github.com/thalesfragoso/a07340c5df6eee3b04c42fdc69ecdcb1
     let gpioa = dp.GPIOA.split();
     let rcc = dp.RCC.constrain();